Shanli Tech is an international modern and export-oriented high-tech enterprise famous for its professional research and manufacture of international high-end carbon molecular sieve products. It integrates scientific research, production, domestic and foreign trade, technical services and project investment, and vigorously promotes the diversified development, comprehensive business strategy, and focuses on the development of new energy, new materials, new equipment and other business areas.

Contact US

Join Us

Invite agent distributors in different countries If you are interested in us,contact us immediately!

Contact US


More knowledge


Latest News

1. After a long-term technical exchange with Air Products, the samples and large samples provided by our company have met the requirements of the company. Since 2018, we have delivered order products and successfully entered the global supply of AP companies in early 2020. Business directory. 2. Japan's professional manufacturer of laboratory-made nitrogen generators has been using our carbon molecular sieve since 2013. The customer positively evaluated the performance of our carbon molecular sieve, and praised and affirmed our product quality control ability. Purchase volume is also steadily increasing year by year. 3. The equipment transformation and commissioning of production line 1 will be completed in 2019, which will significantly increase the production capacity of production line 1.

The principle of carbon molecular sieve separating oxygen and nitrogen

Carbon molecular sieve pressure swing adsorption nitrogen production is based on van der Waals force to separate oxygen and nitrogen. The dynamic diameter of oxygen molecule is 0.346nm, and the dynamic diameter of nitrogen molecule is 0.364nm. Between the molecular and nitrogen molecular diameters, it is most conducive to the separation of oxygen and nitrogen, with the highest separation efficiency. In fact, the pores of the carbon molecular sieve are scattered between 0.32 and 0.38 nm. When carbon molecular sieve adsorbs gas, the macropores and mesopores only act as channels, and the adsorbed molecules are transported to the micropores and submicropores. The micropores and submicropores (<0.38nm ) These micropores allow gas molecules with small kinetic dimensions to diffuse quickly into the pores while restricting the entry of large diameter molecules. Due to differences in the relative diffusion rates of gas molecules of different sizes, the components of the gas mixture can be effectively separated. The pore size of the micropores is the basis for the separation of oxygen and nitrogen by the carbon molecular sieve. If the pore size is too large, the oxygen and nitrogen molecules can easily enter the micropores and cannot play the role of separation; while the pore size is too small, the oxygen and nitrogen molecules cannot enter In the micropores, there is no separation effect. The carbon molecular sieve produced by our company uses the self-invented micropore adjustment control process. During the processing of the carbon molecular sieve, the micropores are precisely adjusted, and then the nitrogen production process independently developed by our company is matched to maximize the use of the carbon molecular sieve. Performance, under the same adsorption pressure, it can produce more nitrogen and consume less air.

Method for reducing molecular sieve pulverization

1. Reasonably design the gas inlet and gas distributor of the adsorption tower to distribute the gas evenly, let the compressed air diffuse quickly after entering the adsorption tower, reduce the gas flow rate and reduce the impact on the carbon molecular sieve. If the gas distribution is poor, the compressed air will affect the local carbon The impact of the molecular sieve is too large, and the impact over the years can easily cause the powdering of the molecular sieve. At the time of pressure equalization, the molecular sieve at the top and bottom of the adsorption tower is subject to instantaneous impact. Therefore, it is necessary to redesign the design of the gas distribution end distributor of the adsorption tower to reduce the impact of the carbon molecular sieve on the top carbon molecular sieve during pressure equalization. 2. When filling the carbon molecular sieve, every 30 to 40 cm of filling should be tamped to eliminate the excessive gap formed by the natural pouring of the carbon molecular sieve into the carbon molecular sieve, to prevent the bed layer from appearing "overlap" and the gap is too large. It is strictly forbidden to fill the adsorption tower at one time, and then vibrate the adsorption tower again. This is difficult to ensure that the bed is dense. The adsorption tower scours back and forth when the inlet of the adsorption tower. . 3. The pressure equalization is extended. The pressure equalization in the traditional process is too fast. Generally, the pressure equalization ends at 1 to 2 seconds. The adsorption pressure of domestic nitrogen making equipment is generally ≥7 bar. When the pressure equalization ends, the pressure of the adsorption tower rises rapidly by 3.5 bar. If the impact is too large, it is recommended to extend the pressure equalization time to 4-6 seconds by limiting the flow of the pressure equalization pipe.