Zeolite nature have been found more than 30 kinds, more common well-synthetic zeolite powder supplier, chabazite, calcium, heulandite, sodium zeolite, mordenite, Stilbite, etc., are to calcium, sodium based. How much of their water content varies with ambient temperature and humidity changes. Crystals belong to crystal system with different mineral species varies, with monoclinic and orthorhombic (orthorhombic) majority. Analcime, chabazite often has equiaxed crystal form, heulandite, Stilbite form of a plate, erionite, mordenite acicular or fibrous, phillipsite and boiling Danshuang Jing Hui common. Pure various zeolites are colorless or white, but may be due to a variety of light-colored impurities and mixing. Shiny glass. Cleavage varies with the crystal structure. Mohs hardness medium. The proportion ranged from 2.0 to 2.3, containing barium is up from 2.5 to 2.8. zeolite molecular sieve formed in the epithermal stage, common in extrusive rock pores, also found in hydrothermal deposits and the modern spa deposition. The zeolite may be the action of water by diafiltration to exchange cations, the ingredients sodium, calcium ions can be exchanged with an aqueous solution of potassium and magnesium ions to soften hard water industry. The crystal structure of the zeolite comprises silicon (Al) oxy connected into a three-dimensional tetrahedral framework, grid has a variety of different sizes of holes and channels with large open. Alkali metal or alkaline earth metal ions and water molecules are located in the holes and channels, to contact grid is weak. Different ion exchange on the zeolite structure has little effect, but the nature of the 4a zeolite powder so that change. Present in the crystal lattice of different size cavities, can absorb or filter elements of different sizes other substances. Industrially often as a molecular sieve, to purify or separate components of the mixed material, such as gas separation, oil purification, treatment of industrial pollution.
Molecular sieve adsorbent can be separated by selective adsorption of n-paraffins from branched chain hydrocarbons, and the process of cyclic hydrocarbons
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2015年3月26日星期四
2015年3月19日星期四
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.
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.
2015年3月5日星期四
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.
2015年2月19日星期四
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.
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.
2015年2月9日星期一
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
2014年12月19日星期五
Zeolite knowledge: the advantages and characteristics of molecular sieve
Advantages of molecular sieves
According to the size and shape of the molecule adsorption of different choices, that is, only those molecules smaller than the molecular sieve adsorption pore.
For small polar molecules and unsaturated molecules having selective adsorption properties, the greater the polarity, the higher the degree of unsaturation, the stronger its selective adsorption.
With a strong water absorption. Even higher at lower temperatures, a larger space velocity and water content, there is rather high water absorption capacity.
Characteristics of molecular sieves
Molecular sieve oxysiv are crystalline aluminosilicate artificial, based on the size of the internal cavities of the crystal and molecular adsorption or exclusion of different substances, which is aptly called "molecular sieves." It consists of AlO4 and SiO4 tetrahedra composition, in a molecular sieve crystal lattice, metal cations from the balance AlO4 tetrahedra excess negative charge effect. Molecular diameter less than the diameter of the pore molecular sieve crystals can enter the zeolite crystal material, which can be adsorbed, otherwise excluded. Molecular sieves and according to different polar or polarizable substances preferentially adsorbed order. Usually strong polarity molecules are readily adsorbed.
Good thermal stability of molecular sieves, capable of withstanding 600 ° C -700 ° C High Temperature, molecular sieves do not melt in water, but soluble in acid and alkali, it can be in PH5-11 medium, in the salt solution can be exchanged other cations.
According to the size and shape of the molecule adsorption of different choices, that is, only those molecules smaller than the molecular sieve adsorption pore.
For small polar molecules and unsaturated molecules having selective adsorption properties, the greater the polarity, the higher the degree of unsaturation, the stronger its selective adsorption.
With a strong water absorption. Even higher at lower temperatures, a larger space velocity and water content, there is rather high water absorption capacity.
Characteristics of molecular sieves
Molecular sieve oxysiv are crystalline aluminosilicate artificial, based on the size of the internal cavities of the crystal and molecular adsorption or exclusion of different substances, which is aptly called "molecular sieves." It consists of AlO4 and SiO4 tetrahedra composition, in a molecular sieve crystal lattice, metal cations from the balance AlO4 tetrahedra excess negative charge effect. Molecular diameter less than the diameter of the pore molecular sieve crystals can enter the zeolite crystal material, which can be adsorbed, otherwise excluded. Molecular sieves and according to different polar or polarizable substances preferentially adsorbed order. Usually strong polarity molecules are readily adsorbed.
Good thermal stability of molecular sieves, capable of withstanding 600 ° C -700 ° C High Temperature, molecular sieves do not melt in water, but soluble in acid and alkali, it can be in PH5-11 medium, in the salt solution can be exchanged other cations.
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