Carbon molecular sieve is a new adsorbent developed in the 1970s. It is an excellent non-polar carbon material. Carbon molecular sieves (CMS) is used to separate air and enrich nitrogen. It adopts normal temperature and low pressure nitrogen production process. Compared with the traditional cryogenic high pressure nitrogen production process, it has the advantages of less investment cost, fast nitrogen production speed and low nitrogen cost. Therefore, it is the preferred pressure swing adsorption (p.s.a) nitrogen rich adsorbent for air separation in the engineering industry. This nitrogen is widely used in chemical industry, oil and gas industry, electronic industry, food industry, coal industry, pharmaceutical industry, cable industry, metal heat treatment, transportation and storage.
The main component of carbon molecular sieve is elemental carbon, and its appearance is black columnar solid. Because it contains a large number of micropores with a diameter of 4 angstrom, the micropores have strong instantaneous affinity for oxygen molecules and can be used to separate oxygen and nitrogen in the air. Nitrogen is produced by pressure swing adsorption device (PSA) in industry. Carbon molecular sieve has large nitrogen production capacity, high nitrogen recovery rate and long service life. It is suitable for various types of pressure swing adsorption nitrogen generator. It is the preferred product of pressure swing adsorption nitrogen generator.
Working Principle
Carbon molecular sieve uses the characteristics of screening to separate oxygen and nitrogen. When molecular sieves adsorb impurity gases, macropores and mesopores only play the role of channels, transporting the adsorbed molecules to micropores and sub micropores, and micropores and sub micropores are the volumes.
As shown in the left figure, there are a large number of micropores in the carbon molecular sieve, which allow the molecules with small kinetic size to quickly diffuse into the pores while limiting the entry of large-diameter molecules. Due to the difference of relative diffusion rate of gas molecules with different sizes, the components of gas mixture can be effectively separated.
Therefore, when manufacturing carbon molecular sieve, according to the molecular size, the micropore distribution in carbon molecular sieve should be 0.28 ~ 0.38nm. Within the micropore size range, oxygen can quickly diffuse into the micropore through the micropore orifice, while nitrogen is difficult to pass through the micropore orifice, so as to achieve the separation of oxygen and nitrogen. The pore size of micropores is the basis for the separation of oxygen and nitrogen by carbon molecular sieves. If the pore size is too large, oxygen and nitrogen molecular sieves can easily enter the micropores and can not play the role of separation; The pore size is too small, oxygen and nitrogen can not enter the micropores, and can not play the role of separation.
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Vicky Xiao
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Pingxiang Super Packing Mall Co., Ltd.
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