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.

Zeolite knowledge: uses and zeolite molecular sieves with unique properties

Feature uses zeolite 13x molecular sieves it is widely used in petrochemical, gas, refrigeration, food and other fields. 
The main applications are: 
1, the drying activated alumina and liquids; 
2, the purification of gases and liquids; 
3, separating gas and liquid; 
4, hydrocracking, catalytic cracking and isomerization catalyst; 
5, detergent additives and water softener
Zeolite has unique properties:
1, water, gas and liquid reversible adsorption 2, 3 cation exchange properties, pore zeolite has a very high internal surface area suitable for use as a molecular sieve for this depth drying, selective adsorption and catalysis, molecular sieves and other adsorbents Comparison prominent features: 
1, 2 very high adsorption capacity, selective adsorption and separation of 3, 4 catalytic properties, ion exchange characteristics

How molecular sieve adsorbent works

Use of #carbon #molecular #sieves are sieved to achieve the separation characteristics of oxygen, nitrogen purpose. When molecular sieve adsorption of impurity gases, mesopores and macropores function as channels only, the adsorbed molecules transported to the sub-micropores and the micropores, the volume of micropores and sub-micropores is that really Adsorption. As shown below, the carbon molecular sieves comprise a large number of internal pores, the pores allow the kinetics of small molecules rapidly diffuse into the hole size, while limiting the entry of large diameter molecules. Due to the different sizes of the gas molecules relative diffusion rate differences, components of the gas mixture can be effectively separated. Thus, in the manufacture of carbon molecular sieves, molecular size according to the size of the carbon molecular sieve in the internal pore distribution should be 0.28 ~ 0.38nm. Within this pore size range, the oxygen can quickly diffuse into the hole through the porous openings, and the nitrogen is difficult through the porous opening, so as to achieve an oxygen, nitrogen separation. Microporous carbon molecular sieve pore size is the separation of oxygen, nitrogen base, if the pore size is too large, oxygen, nitrogen, into the pores of the molecular sieve is easy, but there is no separation of the role; pore size is too small, oxygen, nitrogen can not enter micropores, but there is no separation. [1]

#Domestic #molecular #sieve due to conditions imposed on the pore size control is not very good. Market sales of carbon molecular sieve pore size distribution of 0.3 ~ 1nm, only Iwatani zeolite did 0.28 ~ 0.36nm. Carbon molecular sieve material for coconut shell, coal, resins, etc., the first step after processing powder, then blend with the base material, the base material is to increase strength and prevent fragmentation pulverized material; second step is to create activation hole, at a temperature of 600 ~ 1000 ℃ passed through activator, commonly used activator water vapor, carbon dioxide, oxygen and a mixture thereof. They are more lively and amorphous carbon thermal chemical reaction to form holes and gradually expand the surface area activated pore time ranging from 10 ~ 60min; The third step is to adjust the pore structure, the use of chemical vapors: such as benzene in carbon microporous molecular sieve wall deposition to adjust the size of the holes, so as to satisfy the requirements.

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.

Zeolite relative term: carbon molecular sieve Interpretation

Use of carbon molecular sieves are sieved to achieve the separation characteristics of oxygen, nitrogen purpose. When molecular sieve adsorption of impurity gases, mesopores and macropores function as channels only, the adsorbed molecules transported to the sub-micropores and the micropores, the volume of micropores and sub-micropores is that really Adsorption. As shown below, the carbon molecular sieve oxysiv comprise a large number of internal pores, the pores allow the kinetics of small molecules rapidly diffuse into the hole size, while limiting the entry of large diameter molecules. Due to the different sizes of the gas molecules relative diffusion rate differences, components of the gas mixture can be effectively separated. Thus, in the manufacture of carbon molecular sieves, molecular size according to the size of the carbon molecular sieve in the internal pore distribution should be 0.28 ~ 0.38nm. Within this pore size range, the oxygen can quickly diffuse into the hole through the porous openings, and the nitrogen is difficult through the porous opening, so as to achieve an oxygen, nitrogen separation. Microporous carbon molecular sieve pore size is the separation of oxygen, nitrogen base, if the pore size is too large, oxygen, nitrogen, into the pores of the molecular sieve is easy, but there is no separation of the role; pore size is too small, oxygen, nitrogen can not enter micropores, but there is no separation.

Carbon molecular sieve is a novel sorbent developed in the 1970s, and is an excellent material non-polar carbon, nitrogen carbon molecular sieve (Carbon zeolite 13x Sieves, 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, pharmaceutical industry, the cable industry, metal heat treatment, transportation and storage and other aspects of a wide range of applications.
In 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

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 emerged.

Zeolite knowledge: a comprehensive understanding of the molecular sieve oxygen plant

Molecular sieve type commonly used pressurized oxygen adsorption and desorption pressure (HP) method, carried out by two adsorption towers were the same cycle, in order to achieve continuous supply. System-wide automatic control by the SCM.
Molecular sieve type oxygen free home-based molecular sieve oxygen concentrator, medical zeolite gas machine
Molecular sieve type oxygen flow to the working principle of the two towers. After feed air pressurized by the compressor, through the air pretreatment means to remove oil, dust and other solid impurities and water, and cooled to room temperature, treated by the compressed air through the intake valve into the adsorber containing a molecular sieve, the air nitrogen, carbon dioxide is adsorbed effluent gas is the high purity oxygen, Tada when adsorbed to a certain saturation, the intake valve closed, the flush valve opens, the adsorption tower into the rinse stage, after the flush valve is closed, the valve opens desorption into the desorption regeneration phase, so that a complete cycle.
The main technical parameters of the molecular sieve oxysiv sieve type oxygen machine
1, the device normal operating conditions Ambient temperature: 5 ℃ ~ 40 ℃
Power supply voltage: 220V ± 22V air compressor host Oxygen, oxygen compressor 380V ± 38V
Power frequency: 50Hz ± 1Hz
Power: 37KW
Relative humidity: ≤80%
Atmospheric pressure: 86Kpa ~ 106Kpa
Host size L × W × H (without air compressor): 3.5 m × 1.8 米 × 2.7 米
2, the physical and chemical indicators of oxygen production equipment manufactured product oxygen 20m3 / h
Oxygen concentration: ≥ 90% (V / V)
Moisture content: ≤0.07g / m3
Carbon dioxide content: ≤0.01% (V / V)
Carbon monoxide content should be consistent with YY / T0298
Gaseous acid and alkali content should be consistent with YY / T0298
Ozone and other gaseous oxide content should be consistent with YY / T0298
Solids particle size: ≤10μm solids content: ≤0.5mg / m3
Edit this paragraph principle characteristic molecular sieve oxygen plant advanced: the use of zeolite, pressure swing adsorption (PSA) will air in oxygen and nitrogen separation, filter out harmful substances in the air, in order to gain compliance with standards of high purity medical oxygen oxygen. Oxygen and low cost: the air as raw material, without any additives, no residue and pollution emissions, low power consumption. Easy to use: plug the production of oxygen, simple operation, stable oxygen concentration, oxygen flow rate is adjustable, as used with the system, 24-hour continuous oxygen. Safe and reliable: Full pneumatic control procedures are low pressure system, stable performance, low noise.

High-silica zeolite ZSM-type zeolite

High-silica zeolite ZSM-type molecular sieves have a series, widely used for ZSM-5 zeolite , with the same structure of ZSM-8 and ZSM-11 zeolite; another group of ZSM-21, ZSM-35 and ZSM-38, etc. . 5a zeolite powder zeolite is often called high-silica zeolite molecular sieve Si / AI ratio can be as high as 50 or more, ZSM-8 up to 100, this group also showed a molecular sieve hydrophobic properties.
Their structural unit and mordenite similar, there are a pair of five-membered ring composed of non-cage-like cavity, only channel. ZSM-5 zeolite has two sets of cross-channel, one for straight and the other perpendicular to whom font, by ten yuan ring. Channel into an oval, its window diameter (0.55-0.60) nm. Belonging to the family of high-silica zeolite also all-silicon type Silicalite-1, ZSM-5 structure, like, Silicalite-2 with the same ZSM-11.

Zeolite transitional form of selective restriction

Some reaction, reactant molecules and their molecular products are not subject to restrictions window catalyst pore diffusion of knowledge within the required holes or due to a larger cage cavity space to form the corresponding transition states, or is restricted so that the reaction can not be ; on the contrary, some of the reactions yo ah just a small space of the transition state would not accept that kind of restriction, which constitutes a selective type catalytic transition state restrictions.
ZSM-5 zeolite used in this transition state selectivity of catalytic reactions, the biggest advantage is to prevent coking. Because ZSM-5 zeolite 5a having a smaller than the other bore, is not conducive to Jiaosheng Cheng precursor polymerization reaction requires a large transition state formed. Thus has a longer life than other molecular sieves and amorphous catalyst.

Several patents of ZSM-5 Zeolite

Our patents on a wide range of molecular sieve, which on ZSM-5 zeolite patent projects is endless.  Today, manufacturers of ZSM-5 zeolite adsorbent Tech Shandong 齐鲁华 letter on to introduce several patents on ZSM-5 Zeolite.
 Using the direct method of ZSM-5 zeolite catalyst developed a number of new patents:
 (1) NKC-01: After the catalyst was replaced by a boron trifluoride catalyst in the synthesis of ethylene glycol ether production, yield increased by 20%, the main raw materials fell 21 percent, reduce the cost of 2,000 yuan per ton of product, and the elimination of boron trifluoride corrosion and contamination of the equipment on the environment.  State Board of Education Science and Technology Progress Award.
 (2) NKC-03 A: dehydration of ethanol to ethylene catalyst than conventional alumina catalyst low reaction temperature 100 ° C, 1-2 times higher airspeed, save energy, improve production efficiency.  National Invention Award Sidengjiang.
 (3) NKC-8912 catalyst ethylbenzene, ethanol synthesis for two ethylbenzene production, allows for two ethylbenzene selectivity of 95-98% dependent on imports for the production of long-xylene separation of adsorbent started a catalytic Synthesis of new technology, so that our "right B diphenyl," the production will achieve localization.  This catalyst has been adopted by the National Natural Science Foundation, Department of Chemistry, chaired identification.

Japan CDS-1 successfully developed a new type of molecular sieve

Recently, Xiao Bian understand a message from the Japanese National Institute of Advanced Industrial Science and Technology (AIST) synthesis of a novel activated zeolite powders CDS-1 has been successfully developed.
 It was prepared by a layered silicate, has a unique structure - by molecular stacking blocks.  According to the institute, said the film chemistry lab, CDS-1 between its silicate layers has many pores.  Research center will work processing CDS-1 into the film, mainly used for the separation agent catalyst.  Typically, the use of a structure-directing agent (Structure-directing agent) complex can be formed by hydrothermal synthesis of nanosized pore size.  These pores may be at about 420 ℃, using condensation polymerization method easily and economically be bonded together to form a silicate layer.
 This made one molecular structure but retain the layered silicate framework is without precedent.  Molecular sieves containing silicon, aluminum and oxygen atoms.  When the silica-alumina composite containing a high proportion of silicon, called a high-silica zeolite.  This kind of molecular sieve is hydrophobic and high temperature.  AIST has a molecular sieve such intellectual property rights, the Department of silicon and oxygen by a silicate system.  It is resistant to high temperature above 800 ℃ and chemical resistance.  When immersed in a solution of an acid or a base, and still retains its original structure.

Molecular sieve Introduction

Molecular sieve is a cubic lattice 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 bore to the interior, and the polarity molecular sieves 3a of the molecules and the preferential adsorption of the unsaturated molecules having a capacity, which can very different degree, a different degree of saturation, and the boiling point of different molecular size to separate different molecules, which has the effect of "screening" of molecules, so called synthetic zeolite powder molecular sieves. Since the molecular sieves have a high adsorption capacity, high thermal stability, etc. The other adsorbents that are not so widely used to obtain the molecular sieve.

Dynamic dry

Definition: the weight of the adsorbent filled in a column adsorption, so that a certain concentration of the solution at a constant regeneration of molecular sieves temperature at a constant rate flow, so as measured by the adsorption capacity and adsorption capacity balance. (Liquid or gas to be treated by the downward flow of adsorbent from the adsorption is called dynamic.) Application: 1, air drying: warehouse, cargo hold, pharmaceutical, precision machinery, electronic Activated zeolite powders equipment factory, compressed air, instrument air dry. 2, the purification of industrial gas dehydration of: hydrogen, oxygen, nitrogen, chlorine, CO2, acetylene, ethylene, methane, ethane, propane, SO3, SO2, natural gas, coal gas.

Vacuum pressure swing adsorption and desorption of oxygen machine

Vacuum pressure swing adsorption and desorption of oxygen machine (referred to as VPSA oxygen), which penetrates under molecular sieves 13x atmospheric pressure conditions, using VPSA special air Selective Adsorption nitrogen,molecular sieve desiccant carbon dioxide and water and other impurities, vacuuming 4a zeolite molecular sieves under the conditions of the molecular sieve desorption, and thus the cycle to obtain high purity oxygen (90 to 94%). VPSA low energy consumption, the greater the power consumption and low equipment.

molecular sieve drying Under a certain pressure

molecular sieve drying Under a certain pressure, as the temperature decreases, the moisture content of natural gas saturated water will fall. Thus, reducing the gas temperature of the gas can  molecular sieve design  be partially condensed steam precipitation method of dewatering. This method requires the use of gas expansion get cold, and can simultaneously control the water dew point and hydrocarbon dew point, 5a molecular sieves  therefore, mostly for high-pressure gas condensate or high-pressure wet containing heavy hydrocarbons such as natural gas wellhead pressure for the use of excess occasion. If the low pressure associated gas for use in high pressure or no pressure wet gas, we need a refrigerant cooling.

The most representative adsorbent is activated carbon adsorption is quite good

Using multiple adsorption column effluent oil content according to the level of a series of sewage treatment,molecular sieve adsorbent oil content in the effluent monitoring at, if the water quality  molecular sieve adsorbent  is not up to then enter the circulatory system to continue processing until the compliance date. If oily wastewater COD, emulsion content is higher, before entering into the first reactor COD removal device and emulsion and dissolved substances such  regeneration of molecular sieves  as pretreatment removal device.
The most representative adsorbent is activated carbon adsorption performance is quite good, but the cost is relatively high, the event has been applied in the Songhua River water for adsorption of toluene. Then there zeolite, silica gel, activated aluminum, polymer adsorbent and biological adsorbents, etc.

This requires to develop alumina industry

This requires to develop alumina industry. Since 1954, Shandong Aluminum production, there Zhengzhou Aluminum Plant, Guizhou Aluminum Plant, Shanxi Aluminum Plant put into operation. Alumina production capacity of 1.2 million tons or more. In order  activated zeolite powders  to meet the needs of the development of the aluminum industry are planning to build a peaceful fruit Zhongzhou Aluminum smelter;and expansion of old plants need to gradually form an alumina base molecular sieve drying in Central China, Northwest, Southwest aluminum base for a more reasonable layout. Alumina production and species will continue to increase. According to the characteristics and production status of bauxite resources, the total recovery of  molecular sieves drying  alumina and alkali consumption compared with similar foreign factories, reached the advanced level. And most economical way to recover from the mother liquor circulation gallium; successful use of the alumina production waste - red mud production of cement, from the surface to improve the overall efficiency of alumina production. At present, the main technical development direction of China's aluminum industry is: continue to develop baked knot and joint production process, using indirect heat strengthened dissolution, fluidized roasting and other new technologies and high equipment.

molecular sieve desiccant

Common physical adsorption desiccant silica gel desiccant, clay desiccant, molecular sieve desiccant, mineral desiccant, fiber desiccant, montmorillonite desiccant.
molecular sieve desiccant
A desiccant material that can remove water in the wet material, often divided into two categories: a chemical agent such as calcium sulfate and calcium chloride, hydrate with water, dried by binding; physical desiccant such as silica gel and the active alumina and the like，molecular sieve grace  by physically adsorbed water and dried.
Moisture control is the product yield is closely related to food, in the appropriate temperature and humidity, food, bacteria and mold will be breeding at an alarming rate, so that food spoilage, resulting in moisture and color changed. Electronic products due to high humidity will cause the metal oxide, adversely. The desiccant is used in order to avoid the occurrence of excess water caused by defective products.

The actual application of molecular sieve particles and the medium

Molecular sieve particles and the medium is the method by physical adsorption,molecular sieve particles and the medium between the adsorbent is zeolite molecular sieve. The major components of air is nitrogen, oxygen and other rare gases,molecular sieve particles and the medium between their molecular polarity of each are not identical,molecular sieves drying the nitrogen polar oxygen polarity to. Zeolite is a kind of polar adsorbent,under isothermal conditions, when the adsorption pressure increases, molecular sievenitrogen equilibrium adsorption amount of particles and the medium is much more than oxygen; when the adsorption pressure, the equilibrium adsorption of nitrogenamount less than oxygen. The properties of zeolite molecular sieve using, molecular sieve drying can be used for producing oxygen pressure adsorption, desorption cycle operation of decompression. Molecular sieve desiccant PSA oxygen machine in thevent, because the pressure is low,molecular sieve design zeolite molecular sieve can not be completelydesorbed and regenerated, so need to vent at the vacuum pump, forced vacuum. The existing technology, vent is directly connected with the vacuum pump vacuum pump,large load, working cycle longer, the vacuum pump is easy to damage, short service life.

The concept of molecular sieve adsorbent and the medium

Molecular sieve particles and medium size: not much difference between each other,can be effectively separated by molecular sieve oxygen generator VPSA.Researchers have tried to use vpsa oxygen generator from the content of nitrogenand methane mixture nitrogen decreased from 23% to 10% the following, molecular sieve particles with the medium and VPSA oxygen generator and the nitrogen and oxygen in the medium granular and molecular sieve separation of argon and oxygen,molecular sieve desiccant the experiment has been successful. It is believed that this technology will haveimportant commercial application prospect. VPSA oxygen generator hollow glassgeneral molecular sieve, with XH molecular sieve and VPSA oxygen generator canadsorb hollow glass of water and organic residues, with a molecular sieve and VPSA oxygen generator generator makes the hollow glass even at very low temperaturesremain clean and transparent, VPSA oxygen generator at the same time, particle andmedium energy the hollow glass bear tremendous variability from seasonal anddiurnal temperature strong internal and external pressure difference with molecular sieve molecular sieve drying, completely solve the ordinary insulating glass hollow glass desiccant is easy to expansion or contraction caused by distorted broken, sieve fully extend the using life of hollow glass molecular.

molecular sieve adsorbent application and sieves 4A molecules

Molecular sieve particles and the medium is a synthetic, molecular sieve aremicroporous aluminosilicate cubic lattice between particles and medium. On the basis of the crystal interior cavity size and adsorption or rejection of molecules of different substances, sieves 4A molecules, thus called "molecular sieve".Molecular sieve particles and the medium is less than the diameter of the aperture of molecular sieve crystal material can enter the crystal of the molecular sieve, molecular sieve adsorbent by adsorption, otherwise, sieves 4A molecular exclusion. Gas molecular sieve dehydration hydration according todifferent polarity molecules are molecular sieve adsorbent preferentially adsorbed order decision.molecular sieve natural gas dehydration select adsorption by molecular size and shape of different, de hydration is only adsorption are smaller than those of molecular sieve aperture molecular gas molecular sieve. Sieves 4A molecules for polarsmall molecules and unsaturated molecules, molecular sieve dehydration of natural gas hydrate production with the selective adsorption performance,sieves 4A molecular polarity is greater, increasing unsaturation, the selective adsorption is stronger. Zeolite molecular sieve which belongs to a kind ofmolecular sieve desiccant, and the structure of NaCl is very similar to natural gas hydrate, molecular sieve dehydration belongs to cubic. Molecular sieve drying the space network structure composed of silicon oxygen tetrahedronunit [SiO4] and tetrahedral [AlO4] units are staggered into. molecular sieves 4a and gasmolecular sieve dehydration of hydrated ion exchange properties, water softening function: natural gas molecular sieve dehydration every oxygen atomhydrated skeleton are two tetrahedral adjacent to the total, natural gasmolecular sieve dehydration hydration this structure form for Yang from thecrystal cave and water molecules occupy, natural gas molecular sieve dehydration hydration and these cations and water molecules have greatermobility, of cation exchange and reversible dehydration.