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, 3a zeolite molecular sieves 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 zeolite powder original NaY (Wenzhou Chemical), NaM (Nanjing plant 5a zeolite molecular sieves  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

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.

Use of zeolites

Adsorbents and desiccants
Catalyst
Detergent
Other uses (wastewater treatment, soil conditioners, feed additives)
Zeolite is a new material, is widely used in industry, agriculture, defense and other sectors, and its use are continuing to explore. Zeolite is used as ion exchangers, adsorption separation, drying agents, catalysts, cement admixture. In the petroleum, chemical industry, as petroleum refining catalytic cracking, hydrocracking and petroleum chemical isomerization, reforming, alkylation, disproportionation; gas and liquid purification, separation and storage agent; water softening, water desalination agent; special desiccant (dry air, nitrogen, hydrocarbons, etc.). In light industry for the paper, synthetic rubber, plastics, resins, fillers and coating quality color. In defense, space technology, ultra-high vacuum technology, the development of energy, electronics, etc., used as a separating agent and desiccant adsorption. In the building materials industry, as active hydraulic cement admixture, firing artificial lightweight aggregate, produce lightweight high-strength sheet metal and bricks. In agriculture as a soil conditioner, can play a fertilizer, water, prevent pest effect. In the livestock industry, as feed (pigs, chickens) additives and deodorants, can promote animal growth, improve chick survival. In terms of environmental protection to deal with waste gas, waste water, removal or recycling of metal ions, removal of radioactive contaminants in wastewater effluent from the wastewater.
activated zeolite powders in medicine for the determination of blood and urinary nitrogen content. Zeolite was also developed as a health supplies for anti-aging, remove heavy metals accumulated in the body.
In the production of zeolite commonly used in sugar refining.
New wall materials (aerated concrete blocks) materials
With the solid clay brick gradually leave the stage, the proportion of new wall materials application has now reached 80% of the wall materials production enterprises to gangue, fly ash, ceramic, slag, light industrial waste, heavy construction waste and zeolite based materials, and actively develop new wall materials.
Distillation or heating in a chemical experiment which used to prevent bumping, because the structure of the synthetic zeolite powder which have a large number of small holes, can be used as the bubble condensation nuclei, the reaction solution stable boiling. Available crack to the grain size of unglazed tiles instead.

Introduction and development of carbon molecular sieve background

Description: carbon molecular sieveis a novel sorbent developed in the 1970s, and is an excellent material non-polar carbon, nitrogen carbon molecular sieve(Carbon Molecular Sieves, CMS) for the separation of air enriched in nitrogen, room temperature using low-pressure nitrogen process than conventional high-pressure nitrogen cryogenic process has less investment costs, faster production of nitrogen, 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.

R & D background: the 1950s, along with the tide of the industrial revolution, more and more widespread application of carbon materials, including activated carbon applications
PSA nitrogen with carbon molecular sieve
PSA nitrogen with carbon molecular sieve
Extended fastest filter impurities from the initial separation of the progressive development of the different components. At the same time, as technology advances, the human processing capacity of the material is also growing, in this case, carbon molecular sieve adsorbentinto being

What is zeolite 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 molecular separation open, that has the effect of "screening" elements, so called molecular sieves. Currently #zeolite #desiccant widely used in the metallurgical, chemical, electronics, petrochemical and natural gas industries.

Variety of zeolite

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.

Characteristics of zeolite

Zeolite is zeolite family of minerals in general, is an aqueous alkali metal or alkaline earth metal aluminum silicate mineral. By zeolite mineral characteristics into frame, sheets, fibers and Unclassified of four, according to pore system characteristics into one-, two-, three-dimensional system. Any zeolite by silicon-oxygen tetrahedron and aluminum oxygen tetrahedra. Tetrahedron can only apexes, i.e. sharing one oxygen atom, and not "side" or "face" is connected. Aluminum-oxygen tetrahedron itself can not be connected, there have been at least one silicon-oxygen tetrahedron. The silicon-oxygen tetrahedron can be directly connected. Silicon-oxygen tetrahedron silicon, aluminum atoms can be replaced by aluminum-oxygen tetrahedron constituted. However, aluminum atoms are trivalent, so aluminum tetrahedron, there is an oxygen atom price has not been neutralized, a charge imbalance is generated, so that the whole is negatively charged tetrahedral aluminum oxide. In order to maintain a neutral, positively charged ions must be offset to compensate for the generally alkali metal and alkaline earth metal ions, such as Na, Ca and Sr, Ba, K, Mg and other metal ions. Because zeolite has a unique internal structure and chemical properties of crystallization, thus making the 5a zeolite powderhas a variety of industrial and agricultural use of the available features.
The world has discovered natural zeolite is generally light gray, sometimes red meat. In our hands, obviously felt lighter than stone, which is fine because the interior is filled with zeolite cavities and channels, much more complex than the hive. If the zeolite compared to hotels, so within a cubic micron of this "super hotel" as much as one million "room"! These rooms can be based on "Passenger" (molecules and ions) sex, height, fat, thin, different automatic door or onto trains, hobby, will not let the "Fat Man" to "thin" the room to go, does not make tall Shorty and sharing a room. According to the characteristics of zeolite molecular screening of people use it to get good results. This has particular significance for the recovery of copper, lead, cadmium, nickel, molybdenum and other metal particles in industrial waste.
Zeolite having adsorption, ion-exchange, acid catalysis and heat resistance properties, it is widely used as adsorbents, ion exchangers and catalysts, may also be used for drying gases, purification and sewage treatment and so on. Zeolite also has a "nutritional" value. 5% of the synthetic zeolite powders in the feed, make livestock grow faster, Tizhuang fresh meat, egg production rate.
Due to the nature of the porous silicate zeolite, the wells there is a certain amount of air, is often used riot boiling. When heated, the air inside the hole escape, acts as a gasification nuclei, small bubbles are easily formed on the corners.

Variety zeolite

Zeolite nature have been found more than 30 kinds, more common well-zeolite, 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 variouszeolite molecular sieve 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 5a 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 zeolite 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

Principle of carbon molecular sieve nitrogen air separation

The product is carbon molecular sieve adsorbent is a porous material composed of carbon, pore structure model for disordered accumulation of carbon. Carbon molecular sieves non-stoichiometric compounds, important properties which is based on its cellular structure. It is the ability to separate the air, depending on a variety of gases in the air, carbon molecular sieve pore diffusion different speeds or different adsorption, or both effects simultaneously. Under equilibrium conditions, the carbon molecular sieve adsorption of oxygen and nitrogen is very close, but oxygen molecules through the diffusion rate of nitrogen molecules faster narrow voids than molecular sieve olecular sieve systems, carbon molecular sieve nitrogen air separation is based on this performance, before the time far from equilibrium conditions, the separation by the PSA process so that the nitrogen gas from the air
Third, the device is generally referred to as nitrogen machine. Which process is the use of pressure swing adsorption method at room temperature (referred to as PSA), PSA for pyrogen adsorption separation process, carbon molecular sieve is adsorbed component (mainly oxygen molecules) absorption capacity due to the above principle in the charge pressure, when the gas adsorption, the exhaust gas desorption during depressurization, regeneration carbon molecular sieve. At the same time, the bed gas phase enriched nitrogen gas through the bed a product, each step even for loop operations.
PSA process cycle operations include: pressurized gas production; grading; buck, exhaust; then pressurized gas production; ...... several working stages, the formation of cyclic operation. Depending on the method of its regeneration process can be divided into vacuum regeneration regeneration processes and atmospheric processes.
PSA Nitrogen device according to the user's needs may include compressed air purification systems, pressure swing adsorption systems, process control systems valves (vacuum regeneration with a vacuum pump needed), and nitrogen supply system

Characteristics of zeolite

Zeolite is zeolite family of minerals in general, is an aqueous alkali metal or alkaline earth metal aluminum silicate mineral. By zeolite mineral characteristics into frame, sheets, fibers and Unclassified of four, according to pore system characteristics into one-, two-, three-dimensional system. Any zeolite by silicon-oxygen tetrahedron and aluminum oxygen tetrahedra. Tetrahedron can only apexes, i.e. sharing one oxygen atom, and not "side" or "face" is connected. Aluminum-oxygen tetrahedron itself can not be connected, there have been at least one silicon-oxygen tetrahedron. The silicon-oxygen tetrahedron can be directly connected. Silicon-oxygen tetrahedron silicon, aluminum atoms can be replaced by aluminum-oxygen tetrahedron constituted. However, aluminum atoms are trivalent, so aluminum tetrahedron, there is an oxygen atom price has not been neutralized, a charge imbalance is generated, so that the whole is negatively charged tetrahedral aluminum oxide. In order to maintain a neutral, positively charged ions must be offset to compensate for the generally alkali metal and alkaline earth metal ions, such as Na, Ca and Sr, Ba, K, Mg and other metal ions. Because zeolite has a unique internal structure and chemical properties of crystallization, thus making the 5a zeolite powderhas a variety of industrial and agricultural use of the available features.
The world has discovered natural zeolite is generally light gray, sometimes red meat. In our hands, obviously felt lighter than stone, which is fine because the interior is filled with zeolite cavities and channels, much more complex than the hive. If the zeolite compared to hotels, so within a cubic micron of this "super hotel" as much as one million "room"! These rooms can be based on "Passenger" (molecules and ions) sex, height, fat, thin, different automatic door or onto trains, hobby, will not let the "Fat Man" to "thin" the room to go, does not make tall Shorty and sharing a room. According to the characteristics of zeolite molecular screening of people use it to get good results. This has particular significance for the recovery of copper, lead, cadmium, nickel, molybdenum and other metal particles in industrial waste.
Zeolite having adsorption, ion-exchange, acid catalysis and heat resistance properties, it is widely used as adsorbents, ion exchangers and catalysts, may also be used for drying gases, purification and sewage treatment and so on. Zeolite also has a "nutritional" value. 5% of the synthetic zeolite powders in the feed, make livestock grow faster, Tizhuang fresh meat, egg production rate.
Due to the nature of the porous silicate zeolite, the wells there is a certain amount of air, is often used riot boiling. When heated, the air inside the hole escape, acts as a gasification nuclei, small bubbles are easily formed on the corners.

Variety of zeolite

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.