Superficial knowledge of the porous molecular sieve material

Porous psa oxygen generator molecular sieve materials are an important class of inorganic non-metallic advanced materials in the fields of petrochemical, materials science, energy storage, environmental protection and management, bio-medicine, with a broad expansion of space and good prospects.  With the deepening of research work, according to the actual needs of human beings to design and synthesize more features excellent performance molecular sieve materials, as people's living standards improve, the development of human civilization and social progress, play an important role. 

 In recent years, our country has made significant progress in zeolite synthesis and preparation as well as the catalytic converter and other molecular sieve powder catalytic materials research by the national attention, since the "Plan", has won a major project of the National Natural Science Foundation, the National Climbing Program and the state's major Basic Science Program (973) and other project support, has made a series of major scientific and technological achievements.  Especially Zeolite synthesis of mesoporous materials research and other fields are at the international forefront.

Carbon molecular sieve

Carbon molecular sieve is a novel sorbent developed in the 1970s, and is an excellent material non-polar carbon, nitrogen carbon molecular sieve (Carbon molecular sieve desiccant, CMS) for the separation of air enriched in nitrogen at room temperature using low nitrogen technology, less investment costs, production of nitrogen faster than conventional high-pressure nitrogen cryogenic process has, nitrogen, and low cost. Therefore, it is currently the preferred engineering PSA (the PSA) nitrogen-enriched air separation adsorbents, such as nitrogen in the chemical industry, oil and gas industry, electronic industry, food industry, coal industry, the pharmaceutical industry, the cable industry, metal heat treatment, transportation and storage and other aspects of a wide range of applications.

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.

Some catalytic behavior of molecular sieve dehydration in ethanol amination reaction

Aliphatic amines is an important raw material of pesticides, pharmaceuticals, dyes and other industries. Its main synthetic methods ammoniated alcohol dehydration and alcohol dehydrogenation amination, an AI:. O, as a catalyst since production has since been put in since the early 1960s. Its alcohol conversion rate is acceptable, but a less selective amine. Binary and ternary metal oxide catalytic systems studied many reports ['', due to poor performance, the industry .zSM a selective 5 zeolite came after an attempt to take advantage of its role in improving the shape-selective primary amine has not been adopted Research work has been reported ['a 6'. Selective dehydration of methanol amination reaction of methylamine is indeed improved. For alcohol-containing C-C bond, molecular sieve dehydration amination reaction catalyst as a research work has not yet commenced. This article focuses on the study of various zeolite acidity, pore structure on ethanol dehydration amination. Got some interesting results. Experiment 1 reagent and preparing molecular sieve powder original NaY (Wenzhou Chemical), NaM (Nanjing plant molecular sieve) and NaZSM a 5 (Nankai Chemical) were treated with 10% NH; NO. Solution, 1 mol / L and 0.1 mol L hydrochloric acid solution / Maid change at a certain temperature for several hours to obtain sodium hydrogen zeolite washing, suction filtration, drying, take part NaHY, NaHM, NaHzSM a 5 respectively 5% LaC13, La 10% MgclZ solution obtained corresponding exchange, Mg · zeolite, washing, suction filtration, dried and set aside. Pu 2 test zeolite catalyst

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.

Application of molecular sieves 4A

Detergent additives: 4A zeolite as a detergent additive main function is to produce calcium ion exchange water softening, remove dirt and prevent redeposition. zeolite 4a 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: molecular sieves 4a 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. molecular sieves 4a 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 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.

Some catalytic behavior of molecular sieve dehydration in ethanol amination reaction

Aliphatic amines is an important raw material of pesticides, pharmaceuticals, dyes and other industries. Its main synthetic methods ammoniated alcohol dehydration and alcohol dehydrogenation amination, an AI:. O, as a catalyst since production has since been put in since the early 1960s. Its alcohol conversion rate is acceptable, but a less selective amine. Binary and ternary metal oxide catalytic systems studied many reports ['', due to poor performance, the industry .zSM a selective 5 zeolite came after an attempt to take advantage of its role in improving the shape-selective primary amine has not been adopted Research work has been reported ['a 6'. Selective dehydration of methanol amination reaction of methylamine is indeed improved. For alcohol-containing C-C bond, molecular sieve dehydration amination reaction catalyst as a research work has not yet commenced. This article focuses on the study of various zeolite acidity, pore structure on ethanol dehydration amination. Got some interesting results. Experiment 1 reagent and preparing molecular sieve powder original NaY (Wenzhou Chemical), NaM (Nanjing plant molecular sieve) and NaZSM a 5 (Nankai Chemical) were treated with 10% NH; NO. Solution, 1 mol / L and 0.1 mol L hydrochloric acid solution / Maid change at a certain temperature for several hours to obtain sodium hydrogen zeolite washing, suction filtration, drying, take part NaHY, NaHM, NaHzSM a 5 respectively 5% LaC13, La 10% MgclZ solution obtained corresponding exchange, Mg · zeolite, washing, suction filtration, dried and set aside. Pu 2 test zeolite catalyst

Molecular sieve adsorption principle

Molecular sieve adsorption the gaseous and a liquid substance (adsorbate) immobilized on a solid surface (adsorbent) physical phenomena, the solid (adsorbent) to a large number of micropores having an active surface, the molecules are adsorbed by the surface of the adsorbent mass gravity the effect thus fixed thereto. Depends on the size of gravity: the adsorbent surface structure (pore rate; partial pressure of adsorbate; temperature.
With the adsorption heat is a reversible phenomenon. Similar to the condensation: If you increase the pressure. molecular sieve adsorbent adsorption capacity increases; lowering the temperature, increase the adsorption capacity. Therefore, when the adsorption pressure is raised to make the maximum temperature to a minimum. Desorption, the pressure is reduced to make the minimum, the maximum temperature rise.
The adsorption phase: CO2 absorption by the effect of aluminum oxide is poor, so it is mainly used for adsorbing H2O, and the 13x zeolite molecular sieves is located in the subsequent drying process air containing CO2.
Zeolite has a strong water absorption, therefore, during the adsorption and regeneration will not allow contact of the Molecular sieve adsorption reduces the moisture adsorption capacity of CO2. If an accident happens so that water into a sieve, only special high-temperature regeneration will be able to restore the original adsorption performance.