Ion-exchange properties of molecular sieves 4A

4a zeolite powder ion exchange properties, take advantage of this capability to soften water. 4a zeolite molecular sieves 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 can 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.

Molecular sieve desiccant

Aluminosilicate compound having a cubic lattice, is mainly composed of silicon aluminum attached through an oxygen bridge consisting of the open framework structure, there are a lot of uniform pore size and neat in pore structure, large surface area of the inner hole. It also contains a low price and a larger ionic radius of metal ions and the chemical form of water. Since the water molecules in the continuous loss of heat, but the same crystal framework structure, the formation of many of the same size of the cavity, the cavity there are many of the same diameter connected pores, the diameter of these small pores of uniform size, pore ratio can diameter smaller molecules adsorbed into the interior of the cavity in the past, and the ratio of pores too large molecular exclusion, and thus able to molecular diameter different shapes, different degree of polarity of the molecule, the boiling point of different molecules, the different degree of saturation of psa oxygen generator molecular sieve supplier separation open, that has the effect of "screening" elements, so called regeneration of molecular sieves  Currently zeolite widely used in the metallurgical, chemical, electronics, petrochemical and natural gas industries

Pore ​​Zeolites

Pore ​​zeolite molecular sieve research progress in the synthesis and application of the latest, also summarizes the different synthetic zeolite powder suppliers  ynthesis system, compare the advantages and disadvantages of different full lines indicate the presence of the force assembled in common is the presence of the interface between the organic and inorganic phases . Depending on the type of interface force general synthetic route will be divided into three categories, and noted that the same type of interface force, modulating their relative size also can develop into different synthetic routes. Mesoporous summary of research results in skeletal structure, composition, morphology and pore size, etc., summarizes the different treatment methods modified mesoporous molecular sieves.

Introduction of 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 zeochem molecular sieves  Since the molecular sieves 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 molecules, such materials are known as air separate unit molecular sieve adsorbent.
In fact, in 2001, scientists in the UK "Nature" magazine reported that they had discovered a titanium silicate material known as ETS-4 can be used as a good molecular sieve. When the temperature rises, ETS-4 will gradually dehydrated, pore size decreases. Finely adjust the pore size in the use of this method, (1 angstrom equals one billion of a meter) in the 3-4 Angstroms range. Scientists say some common elements such as nitrogen, methane, oxygen, argon and water molecules are about the size of 3-4 Å, another is almost the same size, molecular sieves drying made with ETS-4 can effectively separate them. Researchers have experimented with ETS-4 from the nitrogen content in the mixture of nitrogen and methane, from 18% to 5%, and in the separation of argon and oxygen, nitrogen and oxygen experiments have been successful. It is believed that this technology will have important commercial applications

Application of Y zeolite

Shandong letter Tech as the largest molecular sieve base, specializing in the production of ZSM-5 zeolite, Y-type zeolite , Y zeolite manufacturers today to introduce the application of Y zeolite.
Structure of matter determines the performance, NaY zeolite relatively homogeneous, well-developed pore structure, after the ion exchange retention rich acid catalysis of proton acid sites make it possible. However, due to the high NaO NaY zeolite content, inhibits the normal role of proton acid sites, while NaY zeolite poor thermal stability, and only about 700 ~ C. So inevitably lead directly skeleton collapsed, losing developed a three-dimensional channel, terminate the catalytic reaction to proceed, it is generally reduced through the ion exchange skeleton Na0, ultra-stable process to improve the stability of the skeleton before use.
More ZSM-5 zeolite, Y zeolite information please pay attention to our letter of Shandong Qilu Hua Tech http://www.sdqlhx.com

Molecular sieve purification system air pressure fluctuations caused by water

Today, the largest of the ZSM-5 zeolite , Y zeolite base, to introduce a water purification system failure molecular sieve due to air pressure fluctuations caused by the following manufacturers to follow the molecular sieve with a look.
A company in ASU purging and testing process, there were two activated zeolite powders  ater purification system failure, molecular sieve purification system at the air inlet of the trap a lot of water spray. After analysis, found to be due to changes in air separation system operating pressure range is too big, one in the device during the cooling air distribution unreasonable blowing pipe valve operating too fast, too fast, the air pre-cooling system pressure fluctuations air flow entrainment lot of water purification systems to the molecular sieve. 2. Coupled with the purge job to constantly adjust the outlet valve opening sieve purification systems, air compressors and air lead after pre-cooling system pressure changed much, but not in time to monitor and control air pre-cooling system air pressure, so that the cooling water fleeing into the molecular sieve purification system.3. Meanwhile, the testing process air pre-cooling system is not put into operation interlock parking, ASU is not one of the reasons for the abnormal situation automatically interlock parking also in the event of failure.
In case of this fault, the electric heater can be improved by the outlet temperature setpoint 180 ℃ to 220 ℃, and the molecular sieve adsorber prolonged heating and blowing cold time. Adjusted ASU to resume normal operation.
More ZSM-5 zeolite, Y zeolite, and other related information

Low bulk patented invention than the original powder 4A Zeolite

Today Y zeolite manufacturers to introduce a low-pile than synthetic zeolite powder supplier  riginal patented invention. Interested friends may wish to look slightly!
A low bulk manufacturing process than the original powder of type 4A molecular sieves, type 4A molecular sieves for synthetic techniques, passes through the ingredients, slurry, crystallization, and the crystals were washed after separation in the system, characterized in that the sodium aluminate solution and industrial sodium silicate ingredients, slurry, crystallization reaction system control: 2.7 ~ 4.0Na2O · Al2O3 · 1.8 ~ 2.1 SiO2 · 110 ~ 170H2O. The present invention uses a sodium aluminate solution and sodium silicate hydrothermal synthesis method, by reducing the ratio of water and sodium, increase reactant concentrations synthesis system, a shorter crystallization time than small manufacturing a heap, a large adsorption capacity 4A molecular sieves original powder, and hard, smooth surface of the product, in the loading process, low dust, good flow properties, particularly suitable for insulating glass molecular sieve. Simple, low production cost, short production cycle, high solid content of products, high yield, achieve the desired purpose, to meet the performance requirements of the product.

Zeolite molecular sieve effect manufacturers for you to explain

5a zeolite powdere is a porous gel. Various molecular sieves have a range of pore size distribution, there is a maximum limit and minimum limit. The maximum pore diameter than the molecular diameter of the gel, will all be exclusion outside the gel particles, this situation is called a full-exclusion. Even if the full exclusion of two molecules of different sizes, can not have separation. Minimum pore diameter than the diameter of the gel small molecules can enter all pores of the gel. If two molecules can enter all the gel pores, even if their size difference, there will not be a good separation effect. Therefore, it must have a certain degree of molecular sieve range of use.
In summary, there are three cases in gel chromatography, one molecule is very small, can enter all of the zeolite 13x pores; the second is a large molecule, can not enter any of the gel pores; three molecules of moderate size , can enter within the pores of the gel pore size corresponding parts. Large, medium and small three molecules more readily separated from each other, but each gel isolated molecules outside the range, without changing the type of the gel is difficult to separate the cases. For molecules of different sizes, but the same is within the scope of the various gel isolated molecules, in the distribution of the gel bed is different: the larger molecules into the aperture only that part of the larger gel pores, and the molecule may enter more gel particles, such molecules larger movement distance is short, smaller molecules to move a long distance in the gel bed. So the larger molecules to smaller molecules through the gel bed and the rear through the gel bed, thus separating the molecular sieve can make use of different substances. Further, the gel itself has a three-dimensional network structure, when the large molecules through the pores in such a network structure on the greater resistance, resistance is small by small molecules. In adopting the gel bed, according to molecular size "queue, gels behave different molecular sieve effect size of various ingredients.

Zeolite molecular sieve effect manufacturers for you to explain

As the largest molecular sieve R & D base, Shandong Qilu Hua letter Hi-Tech Co., Ltd. specializes in producing a large number of high quality zeolite ZSM-5 , Y-type zeolite molecular sieves and other products. As a professional manufacturer, how can we tell you about the famous site of "molecular sieve effect" mean? Today, manufacturers would please listen to you explain what molecular sieve "vacuum pressure swing adsorption molecular sieve effect" ......

When a sample solution containing various molecules slowly flows through the gel column, each molecule in the column simultaneously with two different motion: vertical downward movement and non-directed diffusion movement. Macromolecules due to a larger diameter, not easy to enter pores of the gel particles, but only the distribution between the particles, the moving down when eluted faster. After the addition to the proliferation of small molecules in the gel particle gap, you can also enter the pores of the gel particles that enter the gel phase in the process of moving down in a gel diffusion from the particle gap then enter another gel particles, so continue to enter and spread down the speed of small molecules behind the macromolecules so large molecules in the sample elutes from the column first, slower middle molecules, molecular smallest final outflows, a phenomenon called molecular sieve effect.