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

Zeolite relative term: carbon molecular sieve Interpretation

Carbon molecular sieve is a novel sorbent developed in the 1970s, and is an excellent material non-polar carbon, nitrogen carbon molecular sieve (Carbon 5a zeolite molecular sieves 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, activated zeolite powder including activated carbon applications
PSA nitrogen with carbon molecular sieve

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

molecular sieve drying 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

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 Luoyang Jianlong Chemical Industrial Co., Ltd., ZSM-5 structure, like, Silicalite-2 with the same ZSM-11.

Advantages of molecular sieves

According to the size and shape of the molecular sieves 3a adsorption of different choices, that is, only those molecules smaller than the molecular sieve adsorption pore. 
For small polar molecular sieve manufacturers 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.

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. . molecular sieve beads 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 molecular sieve 4a 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 zeolite desiccant 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 molecular sieve sylobead 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 5a molecular sieve Tech Shandong 齐鲁华 letter on to introduce several patents on ZSM-5 Zeolite.
 Using the direct method of molecular sieve 5a 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.