VPSA oxygen system consists

VPSA oxygen system consists of a blower, a vacuum pump, the switching valve, a surge tank, and oxygen absorber composition. After the feed air intake filter to remove dust particles, is pressurized blower to 0.3-0.5barg into   activated zeolite powder 3a  which the one adsorber. Adsorber filled with an adsorbent, wherein moisture, carbon dioxide, and small amounts of other components in the gas inlet of the adsorber is loaded in the bottom of the absorption of the active alumina, and then the ASU molecular sieve sieve adsorbed nitrogen gas is filled in the upper portion of the activated alumina, zeolite molecular sieve. And the oxygen (including argon) as a non adsorbed component from the top outlet of the adsorber product gas is discharged to the oxygen surge tank.

Activated zeolite powders Sieved using carbon molecular sieves to achieve

Sieved using carbon molecular sieves to achieve the separation characteristics of oxygen, nitrogen purposes. Molecular sieve adsorption of impurities in the gas, only macropores 4a zeolite molecular sieves and mesopores channels play a role in the delivery of molecules to be adsorbed in the micropores and sub-micropores, is the volume of the micropores and sub-micropores that really Adsorption. As shown in the previous figure, the carbon molecular sieves comprise a large number of internal pores, the pores allowing the rapid kinetics of diffusion of small molecules into the hole size, while limiting the entry of large diameter molecules. Activated zeolite powders Due to the relative sizes of the diffusion rate of the gas molecules are different, the components of the gas mixture can be effectively separated.  dehydration of natural gas .Therefore, when producing a carbon molecular sieve, the molecular size depending on the size of the carbon molecular sieves should be the internal pore distribution 0.28 ~ 0.38nm. The pore size within the range, oxygen can quickly diffuse into the hole opening through the porous, and the nitrogen through the porous opening is difficult to achieve an oxygen, nitrogen separation. Microporous carbon molecular sieve pore size separation of oxygen, nitrogen base, if the pore size is too large, oxygen, nitrogen, into the pores of the molecular sieve is very easy, but there is no separation of the role; pore size is too small, oxygen, nitrogen can not enter micropores, but there is no separation.

Different points of various molecular sieve

5A molecular sieve can adsorb molecules smaller than the pore size of any generally known as calcium  molecular sieves. In addition it has a 3A, 4A molecular sieve has the effect, but also activated zeolite powder adsorbed C3-C4 n-alkanes, ethyl chloride, ethyl bromide, butanol, etc., can be applied to the separation of normal isoparaffin, Pressure swing adsorption technology and coadsorption of water and carbon dioxide. 5A molecular sieve based on the characteristics of industrial applications, we produce high-5A zeolite selective adsorption, absorption speed, especially for pressure swing molecular sieves adsorption, can be adapted to various sizes of oxygen, hydrogen, carbon dioxide and other gas system pressure swing adsorption unit, PSA is a boutique industry.

Natural gas ingredients

The main component of natural gas hydrocarbons, of which the vast majority of methane, while a small amount of ethane, propane and butane, in addition to generally hydrogen natural gas treatment processes sulfide, carbon dioxide, nitrogen and water vapor and small amounts of carbon molecular sieve desiccant monoxide and traces of noble gases such as helium and argon, etc. . Under standard conditions, methane exists in a gas state to a butane, pentane or more liquid. Methane is the shortest and lightest hydrocarbon molecule.

natural gas regeneration

Gas dryer is a use of molecular sieve adsorption purification of natural gas drying device is widely used in all aspects of the exploitation of natural gas, transportation, plus gas. Applications using temperature swing adsorption principle, the partial pressure of water vapor at room temperature high adsorption (work), at higher temperatures, low water vapor partial pressure to resolve gas regeneration. That adsorbent moisture adsorption in the adsorption process, the regeneration process again rely on high-quality effects angrily (dry air heated) and thermal diffusion mechanism can be completely removed. Advantages: The device is compact overall layout, adsorbent loading capacity, adsorbent long life, closed recycling, not consuming natural gas, the control panel features a text display, good maneuverability.

oxygen generator

VPSA oxygen generator based on the air as raw material, the production of oxygen (or oxygen), nitrogen (or liquid nitrogen) and argon, neon - helium, krypton - a mixed gas of xenon and other equipment. VPSA oxygen system consists of a blower, vacuum pump, switching valves, and oxygen adsorption equilibrium tank components. After the feed air intake filter to get rid of the dust particles, is pressurized blower to 0.3-0.5barg into which the inner one adsorber. Charging the adsorber the adsorbent, wherein moisture, carbon dioxide, and small amounts of other gaseous components in the inlet of the adsorber is loaded in the bottom of the activated alumina adsorbent, and then nitrogen was adsorbed loaded activated alumina in the upper part of zeolitic molecular sieve, and oxygen (including argon) as a non-adsorbed component at the outlet from the top of the adsorber product gas is discharged into the oxygen balance tank.

molecular sieve 4a

We cubic lattice microporous aluminosilicate, according to the size of its intracrystalline pore molecular adsorption or exclusion of different substances, which is known as a molecular sieve, and for the effective pore size molecular sieve is 0.4nm, and the spatial network structure the silicon-oxygen tetrahedral units [SiO4] and aluminum-oxygen tetrahedron [AlO4] unit called staggered arrangement of the 4A zeolite molecular sieve before use to prevent the absorbed water, an organic gas or liquid, otherwise, should be regeneration of molecular sieves.

activated molecular sieves

Activated zeolite powder commonly used in small and medium sized boiler water softening treatment to remove water calcium and magnesium ions, thereby reducing boiler scale formation, reduce water measured corrosion of metals, extend the life of the boiler. In wastewater treatment, can be used to remove phosphorus and lead and hexavalent chromium, activated zeolite can be used after failure after repeated use countercurrent regeneration brine is called regeneration of molecular sieves。

Jianlong zeolite molecular sieves

Our company is a synthetic zeolite powder supplier, specializing in research molecular sieves, adsorbents and other products. Which represents the product is activated zeolite powder, it is a white fine powdery synthetic zeolite products prepared by calcination at 700 ℃ remained stable structure, with superior adsorption performance. Maternal depth can dry adsorption trace moisture, avoid water and some of the active ingredient of the chemical reactions and adsorption system capable of releasing hydrogen sulfide, carbon dioxide and other acid gases, improve the physical and chemical properties of the product or material.

Activated zeolite powders

Due to contain electricity price low ionic radius larger metal ions and combining state of the water, the water Activated zeolite powders in the heated continuously losing, but crystal skeleton structure remains the same, has formed many of the same size of the cavity, the cavity has many of the same diameter pores is linked together, these small cavity diameter size uniform, can channel diameter smaller than the 4a zeolite powder to the interior of the cavity, and channel than large molecules are excluded, so the molecules of different diameter size shape, the degree of different polarity molecules, the boiling point of different molecules, degree of saturation of different molecular separation, which have the function of the "screening" molecules, known as molecular sieve. The molecular sieve in metallurgy, chemical industry, electronics, petrochemical, natural gas and other widely used in industry.

The kinds of molecular sieve 4a

molecular sieve 4a has two kinds of natural zeolite and synthetic zeolites. (1) most of the natural zeolite by volcanic tuff and gray matter in the Marine sedimentary rocks coagulation or react to form in the lacustrine environment. Has now found that more than 1000 kinds of zeolite ore, more important is 35 kinds, common clinoptilolite and mordenite, erionite and ling zeochem molecular sieves, etc. Mainly distributed in the United States, Japan, France and other countries, China is also found that there is a lot of mordenite and clinoptilolite deposits, Japan is the largest country in the production of natural zeolite. (2) by natural zeolite resource constraints, starting in the 1950 s, a large number of the synthetic zeolite.

Commodity molecular sieve common prefix digital classifying crystalline structure of different molecular sieves, such as 3 a, 4 a, 5 a molecular sieve. 4 A type or class A in the table, aperture 4 A. Type A molecular sieve as containing Na + Na - A, if one was Na + K + displacement, pore size is about 3 A, namely type for 3 A molecular sieve; If there is more than A third in the Na - A Na + Ca2 + displacement, pore size of about 5 A, is the type 5 A molecular sieve.

natural gas drying,grace molecular sieves

natural gas drying is amorphous silicate or silicon aluminate, made of silicon oxygen tetrahedron or alumina tetrahedron by oxygen bridge is linked together to form a molecular size (usually from 0.3 to 0.3 nm) of concreted complete cavity system, which are characteristic of molecular sieve. However, with the deepening of the molecular sieve synthesis and application research, the researchers found that the phosphorus aluminate salts molecular sieve, grace molecular sieves and the skeleton of elements (silicon or aluminum or phosphorus) can also Be composed of B, Ga, Fe, Mn, Cr, Ge, Ti, V, Co, Cu and zinc, Be replaced, the concreted complete cavity also can achieve more than 2 nm, the size of the molecular sieve can Be divided by skeleton elements silicon aluminum type molecular sieve, phosphorus kind of molecular sieve and skeleton heteroatomic molecular sieve; According to the hole size, hole size less than 2 nm, 2 ~ 50 nm, and more than 50 nm molecular sieve respectively called microporous and mesoporous and macroporous molecular sieve. With large aperture, become a good carrier of larger molecular reaction, but for amorphous mesoporous materials of hole wall, causing its water thermal stability and thermal stability is not required for petrochemical industry application harsh conditions.

Molecular sieve powder

Molecular sieve powder is a kind of crystal type of aluminum silicate, the crystal structure of neat and uniform pore size was in the order of molecular size, it only allows molecules into the smaller than the aperture diameter, so can according to the size of the molecules in the mixture screening. According to molecular sieve. As early as 200 years ago, b. g dragon, he named the first activated zeolite, the chemical composition in the general formula for molecular sieve zeolite molecular sieve type M and n are metal ions and the valence; X is the silica on the number of molecules; Y is the number of molecules of water; P is aluminum atomic number; Q is number of silicon atoms. Molecular sieves in chemical industry as a solid adsorbent, by adsorption material can desorption, molecular sieve can be recycled after use. Is also used in gas and liquid, dry, purification, separation and recycling. In the 1960 s, used as cracking catalysts in the petroleum refining industry, has now developed a variety of suitable for different molecular sieve catalysts for catalytic process.

4A molecular sieve properties function

 Water softening ion exchange performance features: 4A molecular sieve framework are each oxygen atom is shared by two adjacent tetrahedra, this structure which may be occupied by cations and water molecules large bugholes, and these cations and water molecules have a greater mobility, cation exchange and reversible dehydration. 4A zeolite is ion exchange with aluminum ions in the framework carried a negative charge carried by each of the aluminum ions, may be not only sodium ions, may also be combined with other cations. Calcium and magnesium ions can enter the original sodium ions occupy a large crystal cave, the 4A Zeolite replace sodium ions 4A Zeolite down ---- that sodium ions can be exchanged with hard water Ca2 + ,, Mg2 + ions exchange, so as to achieve the purpose to soften water.
Combined with calcium and magnesium ions in zeolite 4A speed slower than sodium tripolyphosphate, and with the ability to bind magnesium ions is weak. But 4A molecular sieve can be a small amount of water in harmful heavy metal ions (such as Pb2 +, Cd2 +, Hg2 +) can be very easily and quickly removed to purify water has very important significance.
---- Carrier liquid of adsorptive functional surfactant: As 4a molecular sieve crystals of the hole structures, plus fine particles having a large specific surface area, so the strong adsorption performance of 4A molecular sieve.
Adsorption of non-ionic surfactants, 4a molecular sieve 3 times NTA (nitrilo-triacetate) and sodium carbonate, five times the sodium tripolyphosphate (STPP) and sodium sulfate, and the nature of the molding for the agglomeration production of high-concentrated detergent formulated with more surfactants, washing and flow properties obtained good product makes sense. Through the experiment, liquid Zeolite 4A carrying capacity ≥30%, 4A molecular sieves in the detergent production process, increase the mobility of the material, to adjust the viscosity, obtained product appearance, sexual fluidity and anti-caking good product.
Detergency: experiments with different additives on the same formula, changing its detergency aid comparison, found 20% of the STPP, 20% of the molecular sieve, 4% polymer and 40% of the decontamination effect STPP rather, in 20% of non-phosphorus zeolite added 10% sodium carbonate and 4.5% of the polymer obtained very good detergency products.
Redeposition properties: 4a molecular sieve 

with good adhesion of oil, when sodium carbonate, CMC, sodium silicate and sodium and other additives added zeolite adsorption decreased nylon fabric for oil pollution. Particle size of the zeolite at 0.4-1.0μm, better dispersibility can be prevented from adhering on the fabric.
Although not as good as 4A molecular sieve dispersing ability STPP, but with sodium polyacrylate dispersion can solve complex problems of dirt.
Compatibility with other additives: 4A Zeolite proper performance and other additives can make it complementary, 4A molecular sieve dirt dispersion and hardness ions chelating inferior STPP, but 4A Zeolite mix with STPP, detergency can STPP reached with a single effect. This is because since the solid surface can quickly STPP complex calcium and magnesium ions, and passed through an aqueous medium 4A molecular sieves. 4A Zeolite magnesium ion binding ability, can be obtained by molecular sieve complex silicates, carbonates be compensated.
PH buffer: 4A molecular sieves alkaline PH 1% aqueous solution at 11.0, and therefore has a certain buffer alkalinity.
Safety: 4A Zeolite non-toxic, safe to human height. Eyes, skin irritation, does not cause allergies, safety and reliability. After washing deposited in the soil, does not cause pollution, but also can improve soil, 4A Zeolite no adverse impact on the ecology

Zeolite Introduction

zeolite molecular sieve is a cubic lattice of an aluminosilicate compound having. Molecular sieve has a uniform porous structure, the diameter of its pores of uniform size, these cavities can adsorb molecules smaller diameter than the internal bore, and an unsaturated polar molecules and molecules having a preferential adsorption capacity, and thus able to very different degree, different degree of saturation, and boiling points of different molecular sizes of different molecules separated, that has the effect of "screening" elements, so called molecular sieves. Since the molecular sieve dryer have a high adsorption capacity, high thermal stability other adsorbents that are not so widely applied molecular sieve.

In the field of biological macromolecules, a common bio-rad SEC sieve prepacked columns.
US scientists have found that by adjusting the temperature, to precisely control one titanium silicate material pore size, to create a sophisticated molecular sieve. Some internal crystal material has a large number of uniform pore size smaller than the molecules can pass through the holes, while large molecules can not pass through, and thus serves to separate different 4a molecular sieves , such materials are known as molecular sieve.

Molecular sieve functions and features

The porous material has been widely used in many fields, such as the main catalytic microporous molecular sieve material, adsorption and ion exchange material separation materials plays an increasingly important role in oil processing, petrochemicals, fine chemicals, and household chemicals .
Molecular sieves (also known as a synthetic zeolite) is a microporous aluminosilicate crystalline silicon. It is made of silicon oxide, aluminum oxide tetrahedra basic skeleton structure, there is a metal cation in the crystal lattice (such as Na +, K +, Ca2 +, Li +, etc.), in order to balance the negative charge excess crystals. According to their type of zeolite crystal structure is divided into: A type, X-type, Y type.
Zeolite relevant standards:
"3a molecular sieve" "4A molecular sieve" "5a molecular sieve and test methods" "13X molecular sieve"

"Water assay method static sieve" "sieve dynamic water assay method"
"Granular sieve size determination," "Determination of bulk density of molecular sieve" "sieve crush strength test method", "Standard Test Method for molecular sieve desiccant cooling systems with anti-wear performance," "Determination of dynamic zeolite adsorption of carbon dioxide."
"Industrial activated alumina," "air separation plant with activated alumina acceptance technical conditions"
(5) Pharmaceutical ---- silver zeolite antimicrobial agent.

Molecular sieve chromatography

molecular sieve chromatography, also known as gel or gel filtration chromatography. Gel filtration is the use of a certain pore size range of porous gel as the stationary phase, the components of the mixture according to molecular size separating chromatographic technique. A substance having a 13x molecular sieves action are many, such as pumice, agar, agarose, polyvinyl alcohol, polyacrylamide, dextran gels and the like. Sephadex most widely trade name sephadex many models, from G10 to G200, its main applications are: ① fractionation various antigens and antibodies; ② remove complexes of small molecules. Such as desalination, fluorescein and free radioisotopes as well as protein hydrolysis fragments; ④ Determination of the molecular weight; ③ Analysis of immune complexes in serum.

Zeolite molecular sieve basic traits of fold

And structure characteristics of molecular sieves 4a has a crystal surface as the solid skeleton, the internal cavity can have the effect of adsorbed molecules. Cavity between a channel are connected, molecules by the channel. As a result of the cavity clean properties, molecular sieve pore size distribution is very uniform. zeolite adsorbent according to the crystal to selective adsorption of molecules, the size of the internal cavity is adsorbed molecules of a given size and reject material larger molecules.

Zeolite molecular sieve according to its hole or channel system can be divided into the hole, the hole (mesoporous) and double Kong Feishi three categories.

Can be used for the pressure swing adsorption of oxygen enriched air separation.

The basic definition of zeolite molecular sieves

3a molecular sieves is crystallization of aluminum silicate metal salt hydrate, its chemical general formula is: Mx/m [(AlO2), x (SiO2), y] zH2O. M on behalf of the cation, M said its valence number, z said water hydration, x and y are integer. molecular sieve siliporite is activated, the water molecules are removed, the rest of the atoms form cage structure, aperture is 3 ~ 10 & Aring; . Crystals have many size of zeolites hole, hole there are many between the diameter of the hole (also called "window"). Because of the molecular sieve can be smaller than the aperture molecular adsorption into the hole, and to exclude is larger than the aperture of the molecules in the hole, have the effect of molecular sieving, so named molecular sieve. Zeolite molecular sieve can exist in the nature, artificial synthesis from the 1970 s.

Zeolite molecular sieves

natural gas separation is crystallization of aluminum silicate metal salt hydrate, its chemical general formula is: Mx/m [(AlO2), x (SiO2), y] zH2O. M on behalf of the cation, M said its valence number, z said water hydration, x and y are integer. molecular sieve 13x is activated, the water molecules are removed, the rest of the atoms form cage structure, aperture is 3 ~ 10 & Aring; . Crystals have many size of zeolites hole, hole there are many between the diameter of the hole (also called "window"). Because of the molecular sieve can be smaller than the aperture molecular adsorption into the hole, and to exclude is larger than the aperture of the molecules in the hole, have the effect of molecular sieving, so named molecular sieve.

molecular sieve 13x apg

Cylinder with supporting the use of fluoride home is ideal for family drinking fluoride removal device.zeolite molecular sieves The fluoride removal filter also can be used with water plant fluoride device or devices supporting the use of fluoride for  molecular sieve 13x apg industrial use. Household fluoride fluoride filter device activation: Configure aluminum sulfate solution (3 liters of water, 0.3kg solid aluminum sulfate), alumina (AL2P3) fluoride removal filter into the solution, soak 5-10 hours discard dip solution (soaking appropriate mixing),  regeneration of molecular sieves  then washed with water 3-5 times, each about 2 liters of water, or adjust PH regeneration method, PH value control at 7.5. Activated alumina fluoride removal filter can be used continuously for 6-8 years, when the surface appears brown when the effect of fluoride removal significantly reduced, due to impurities in the water pollution in this series, so it's best to use three percent every six months once dilute hydrochloric acid, which methods of operation and regeneration same way.

the "molecular sieve powder" refers to the zeolite

In general, the "molecular sieve powder" refers to the zeolite synthesis After washing, the product after drying (sodium or potassium type, etc.), no activity; also some of the active zeolite component of the catalyst before forming a "molecular sieve powder ", is hydrogen, synthetic zeolite powder suppliers  there is the activity. Now zeolite powder original sub 3A4A5A and other industrial raw powder, and clay bowls direct participation after drying, burning can be made ​​of the appropriate molecular  zeolite molecular sieve sieve. General granular zeolite molecular sieve is made ​​from raw powder and binder forming system, molecular  activated molecular sieve zeolite powder is true, there is no relationship with the activity. A water content of 40% is called the original powder, dried to 20% moisture content, also known as raw powder. Strictly speaking, the moisture content of 2% or less of the original powder is activated powder.

zeolite molecular sieve

In general, the "molecular sieve powder" refers to the zeolite synthesis After washing, the product after drying (sodium or potassium type, etc.), no activity; also some of the active zeolite component of the catalyst before forming a "molecular sieve powder ", is hydrogen, synthetic zeolite powder suppliers  there is the activity. Now zeolite powder original sub 3A4A5A and other industrial raw powder, and clay bowls direct participation after drying, burning can be made ​​of the appropriate molecular  zeolite molecular sieve sieve. General granular zeolite molecular sieve is made ​​from raw powder and binder forming system, molecular  activated molecular sieve zeolite powder is true, there is no relationship with the activity. A water content of 40% is called the original powder, dried to 20% moisture content, also known as raw powder. Strictly speaking, the moisture content of 2% or less of the original powder is activated powder.

synthetic zeolite powder suppliers

In general, the "molecular sieve powder" refers to the zeolite synthesis After washing, the product after drying (sodium or potassium type, etc.), no activity; also some of the active zeolite component of the catalyst before forming a "molecular sieve powder ", is hydrogen, synthetic zeolite powder suppliers  there is the activity. Now zeolite powder original sub 3A4A5A and other industrial raw powder, and clay bowls direct participation after drying, burning can be made ​​of the appropriate molecular  sieve. General granular zeolite molecular sieve is made ​​from raw powder and binder forming system, dehydration of natural gas is true, there is no relationship with the activity. A water content of 40% is called the original powder, dried to 20% moisture content, also known as raw powder. Strictly speaking, the moisture content of 2% or less of the original powder is activated powder.

the "molecular sieve powder" refers to the zeolite

In general, the "molecular sieve powder" refers to the zeolite synthesis After washing, the product after drying (sodium or potassium type, etc.), no activity; also some of the active zeolite component of the catalyst before forming a "molecular sieve powder ", is hydrogen, synthetic zeolite powder suppliers  there is the activity. Now zeolite powder original sub 3A4A5A and other industrial raw powder, and clay bowls direct participation after drying, burning can be made ​​of the appropriate molecular  zeolite molecular sieve sieve. General granular zeolite molecular sieve is made ​​from raw powder and binder forming system, molecular  activated molecular sieve zeolite powder is true, there is no relationship with the activity. A water content of 40% is called the original powder, dried to 20% moisture content, also known as raw powder. Strictly speaking, the moisture content of 2% or less of the original powder is activated powder.

Performance and structure of molecular sieve

Performance: zeolite powdery crystals with metallic luster, hardness of 3 to 5, the relative density of 2 to 2.8, color natural zeolite, synthetic zeolite powder obtained as a white, water-insoluble, heat stability and acid resistance as SiO2 / Al2O3 composition ratio increases and improved. molecular sieve molsiv have a great specific surface area, up to 300 ~ 1000m2 / g, the inner surface of the crystal highly polarized, as a class of highly efficient adsorbents, also a type of solid acid, the surface has a high acid concentration and acid strength, can cause carbonium catalytic ionic reactions. When the composition of the metal ions and other ions in solution were exchanged, adjustable aperture, changes its absorption properties and catalytic properties, which molecular sieve catalyst prepared with different properties.

Zeolite Knowledge: sieve efficient microwave drying technology

Zeolite Knowledge: sieve efficient microwave drying technology. Microwave drying technology to solve the traditional dry sieve slow drying, energy loss, poor product quality problems, in particular in: 
1, microwave drying sieve speed, usually a few minutes to reach the microwave drying purposes; 
2, microwave drying sieve evenly to achieve the depth of dry, good product quality; 
3, static dry, do not burn with less dust; 
4, non-contact drying, to avoid contamination of the molecular sieve; 
5, zeolite 13x microwave drying process safety, energy conservation, environmental protection, the use of electricity, dry inside and outside at the same time, more than 50% energy saving electric dry; 
6, shorten the production cycle, greatly reducing the production of working capital; 
7, microwave drying equipment cabinet temperature below 40 ℃, improve workers' working conditions; 
8. Equipment is simple and convenient.

Performance and structure of molecular sieve

Performance: zeolite powdery crystals with metallic luster, hardness of 3 to 5, the relative density of 2 to 2.8, color natural zeolite, synthetic zeolite powder obtained as a white, water-insoluble, heat stability and acid resistance as SiO2 / Al2O3 composition ratio increases and improved. Molecular sieves have a great specific surface area, up to 300 ~ 1000m2 / g, the inner surface of the crystal highly polarized, as a class of highly efficient adsorbents, also a type of solid acid, the surface has a high acid concentration and acid strength, can cause carbonium catalytic ionic reactions. When the composition of the metal ions and other ions in solution were exchanged, adjustable aperture, changes its absorption properties and catalytic properties, which molecular sieve catalyst prepared with different properties.

Structure: proteoglycan thus formed polymer tortuous coiled, forming a sieve-like microporous structure, known as molecular sieves. Microporous molecular sieve which only allows material through is less than, greater than the pores of macromolecular substances, bacteria and the like having a barrier function is. The matrix becomes the limiting diffusion of harmful substances such as bacteria defensive barrier. Hemolytic streptococcus and cancer cells can produce hyaluronidase, the decomposition of proteoglycan, destruction of the matrix structure, to be spread. On binding proteoglycan aggregate also many hydrophilic groups, capable of binding water molecules, forming extracellular "reservoirs"

Principles and types of Zeolite

Absorption features: molecular sieve adsorption material from physical adsorption (van der Waals forces), which has a strong internal crystal cavities polarity and Coulomb field of polar molecules (such as water) and unsaturated molecules show a strong adsorption capacity.
Screening function: very uniform pore size distribution of the molecular sieve, only molecular diameter smaller than the diameter of the hole before substance may enter bughole internal molecular sieves.
By order of priority and size to distinguish molecular adsorption of different substances, so the image is called "molecular sieve."
Type: synthetic zeolite molecular sieve zeolite and two natural. Most ① natural zeolite formed by volcanic tuffs occur and tuffaceous sedimentary rocks in marine or lacustrine environment reaction. Have been found to have more than 1000 kinds of zeolite mineral, the more important ones are 35 kinds, often with clinoptilolite, mordenite, erionite and chabazite, etc. Mainly in the United States, Japan, France and other countries, China also found that a large number of mordenite and clinoptilolite deposits, Japan is the largest country in the natural zeolite mined. ② due to natural zeolite subject to resource constraints, from the beginning of the 1950s, a large number of synthetic zeolites.
Goods zeolite crystal structure common prefixes Digital classify the different molecular sieves, such as type 3A, 4A type, 5a zeolite molecular sieves. 4A Class A type that table, aperture 4Å ;. A type of zeolite containing Na +, referred to as Na-A, if one is Na + K + replacement, pore size of about 3Å ;, is the 3A molecular sieve; Na-A if there is more than one third of the Na + Ca2 + exchange, aperture is about 5Å ;, is the 5A molecular sieve.

functions and features of Molecular sieve

The porous material has been widely used in many fields, such as the main catalytic microporous molecular sieve material, adsorption and ion exchange material separation materials plays an increasingly important role in oil processing, petrochemicals, fine chemicals, and household chemicals .
molecular sieves(also known as a synthetic zeolite) is a microporous aluminosilicate crystalline silicon. It is made of silicon oxide, aluminum oxide tetrahedra basic skeleton structure, there is a metal cation in the crystal lattice (such as Na +, K +, Ca2 +, Li +, etc.), in order to balance the negative charge excess crystals. According to their type of zeolite crystal structure is divided into: A type, X-type, Y type.
Zeolite relevant standards:
"3a molecular sieve" "4A molecular sieve" "5a molecular sieve and test methods" "13X molecular sieve"
"Water assay method static sieve" "sieve dynamic water assay method"
"Granular sieve size determination," "Determination of bulk density of molecular sieve" "sieve crush strength test method", "Standard Test Method for molecular sieve desiccant cooling systems with anti-wear performance," "Determination of dynamic zeolite adsorption of carbon dioxide."
"Industrial activated alumina," "air separation plant with activated alumina acceptance technical conditions"

Application of molecular sieves 4A

Detergent additives: zeolite 4a as a detergent additive main function is to produce calcium ion exchange water softening, remove dirt and prevent redeposition. 4A Zeolite is currently applied on behalf of the largest builders of phosphorus and most mature product. 4A Zeolite replace sodium tripolyphosphate as detergent additives to solve the environmental pollution has a major role. 4A Zeolite forming agent can also be used soap, toothpaste friction agent.
Sewage: 4A molecular sieve can remove sewage NH3-N, and Pb2 +, Cu2 +, Zn2 + ,, Cd2 + and so on. Industry, agriculture, animal husbandry and aquatic civilian discharged wastewater containing ammonia nitrogen, not only endanger the survival of fish, in the farming environment pollution, and promote algae growth, leading to blockage of rivers and lakes. 4A molecular sieve due to high selectivity of NH4 + exchangeable, has been successfully applied in the field. Sewage from metal mines, smelters, metal surface treatment and chemical emissions from industry and other sectors, which contains heavy metal ions harmful to human health. 4a zeolite molecular sieves with sewage in addition to those qualified to ensure the water quality, but also the recovery of heavy metals.
Other uses:
(1) Water ---- hard water softener, can replace the current widespread use of sulfonated coal, thereby reducing costs;
(2) Metallurgical Industry ---- separating agent, separation, extraction of brine potassium, rubidium, and cesium. In industry for the enrichment, separation and extraction of metals and other processes;
(3) petrochemical industry ---- catalysts, desiccants, adsorbents;
(4) ---- agricultural soil conditioner;
(5) Pharmaceutical ---- silver zeolite antimicrobial agent.