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.