zeolite molecular sieves the gap with foreign countries is growing

zeolite molecular sieves the gap with foreign countries is growing. 1970s was the heyday of PSA oxygen air separation technology development, there are more than a dozen units have carried out  synthetic zeolite powder supplier experimental research PSA oxygen technology, the establishment of a number of sets of industrial test equipment. During this period the development of PSA oxygen equipment common in the following areas:
they use a higher than atmospheric grace molecular sieves  pressure adsorption, desorption atmospheric processes, adsorption tower has two to four;
 before the air enters the adsorber, after dehydration pretreatment;
Poor (3) equipment reliability, not continuous and stable operation, resulting in most of the equipment scrapped;
 technical, economic indicators lag behind.
1980s, the original PSA oxygen equipment in research and development unit of development projects have been suspended, the development of technology, PSA oxygen into the trough again.

activated molecular sieves air filter contaminated air through

activated molecular sieves Micro fan inside the machine (also known as ventilator) indoor air circulation, molecular sieves 13x air filter contaminated air through the machine inside (two filters) will remove a variety of contaminants or adsorption, and then after installed in the outlet of the negative ion generator 4a zeolite molecular sieves (when working in high-pressure ion generator to generate negative high voltage direct current), will continue to air ionization, a large amount of negative ions, being sent out micro fans, form negative ions flow, to clean and purify the air of purpose, thus provide people with a similar nature in the fresh air "micro climate."

The principle is the use of industrial oxygen air separation technology

The principle is the use of industrial oxygen air separation technology,first, a high density compressed air to the condensation point of the air in the re-use of the components is different so air separate unit molecular sieve  that in the gas and liquid from a certain temperature,activated molecular sieves and further distillation derived; home oxygen works: the use of molecular sieve physical adsorption and desorption techniques. molecular sieves 4a  Filling the molecular sieve oxygen generator can be adsorbed nitrogen pressurized air, the remaining oxygen is not absorbed is collected, after purification was turned into high-purity oxygen.

4a zeolite at 110 ° C ambient temperature drying Can be activated

4A, can adsorb water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene, propylene and other low molecular weight compounds as pore molecular sieve 4A, air separate unit molecular sieve does not activated molecular sieves adsorb any molecular diameter greater than 4A (including propane), a high selectivity for water adsorption properties any other molecule, is one of the varieties of industrial zeolite largest amount. 110 ° C for water evaporation is a large space, but it is impossible to zeolite pore water rush out. Therefore, generally zeochem molecular sieves used in a laboratory muffle furnace dehydrated drying can be activated at a temperature of 350 ° C, dried 8 hours at atmospheric pressure (if the vacuum pump can be dried for 5 hours at 150 ° C in the case of the exhaust). The activated molecular sieve in air cooled to 200 ° C (about 2 minutes) and immediately stored in a desiccator. If the conditions applied during the cooling and preservation of dry nitrogen to prevent moisture in the air is absorbed again. Old post contaminants using molecular sieve, activated not only when the temperature of 450 ° C up to, but also to pass into the steam or inert gas (nitrogen) to replace sieve out the other substances.

activated zeolite Activated Zeolite is a natural zeolite

Activated Zeolite is a natural zeolite is made through a variety of special activation process, activated zeolite powder the adsorption performance stronger than the natural zeolite, ion exchange performance is also better, not only to remove the water turbidity, color, odor, and harmful heavy metals in water, such as: chromium, cadmium nickel, zinc, mercury, iron ions and organic: phenol, BHC, DDT, three nitrogen, ammonia nitrogen, phosphate ions activated alumina and other substances with adsorption exchange interaction, but also conducive to all kinds of micro-pollutants removal and flooding fluid does not contain toxic, harmful substances, removal of iron, fluorine effect is more significant. So the ideal filter activated zeolite is a new industrial water supply, wastewater treatment and water filtration.

activated molecular sieves Structure

Zeolitic molecular sieves known as synthetic zeolites or molecular sieves having a chemical composition formula is:
[M2 (Ⅰ) M (Ⅱ)] O.Al2O3.nSiO2. MH2O
Formula M2 (Ⅰ) and M (Ⅱ) respectively monovalent and divalent metal ions, most of the sodium and calcium, n is called silica to alumina ratio of the zeolite, sodium silicate and silicon mainly from silica, aluminum comes from sodium aluminum and Al (HO) 3, etc., which react with aqueous sodium hydroxide colloid was prepared and dried after a zeolite, activated alumina typically n = 2 ~ 10, m = 0 ~ 9.
Characteristics of the zeolite molecular sieve having a role, it has a uniform pore size, such as 3A0,4A0,5A0,10A0 pores. There 4A0 4A0 pore zeolite adsorption of methane, ethane, and not more than three carbon adsorption of n-alkanes. It has been widely used for activated alumina drying agent  gas adsorption separation, drying, and gas and liquid separation are different alkanes.
Thus proteoglycan aggregates composed of coiled turns, forming a sieve-like microporous structure, called molecular sieves. Zeolite molecular sieve allowing only its micro-pores is less than the material through its pores large macromolecules, the bacteria has a barrier function.

Specific applications of activated sieves

Activate sieves is one of the main material of volatile organic compounds in the physical adsorption method used in processing. But if not completely degrade pollutants, easy to produce secondary pollution.regeneration of molecular sieves in order to solve the problem of light pollution, activated sieves humans began to think of ways to use technology to replace traditional catalytic degradation purification technology, activated sieves Photocatalytic treatment technologies emerged. This method is based dioxide as a catalyst, activating sieves method using photocatalytic oxidative degradation of volatile organic compounds in the air, molecular sieve grace no other chemical additives, mild reaction conditions, and the final product is usually only carbon dioxide and water, will not be activated sieves produce secondary pollution.