Application of Zeolite Molecular Sieve in Drying and Purification Field

Application of Zeolite Molecular Sieve in Drying and Purification Field

1) Dehydration. Using the polar hydrophilicity of zeolite molecular sieves with low silicon-to-aluminum ratio (such as type A, type X, etc.), air drying can be carried out. In addition, in recent years, the blending of ethanol into gasoline to replace part of gasoline has received widespread attention. The water content of ethanol as a fuel requires less than 0.8%. However, due to the azeotrope of ethanol and water, only 95% of ethanol can be obtained through rectification. For the dehydration of ethanol with lower water content, zeolite molecular sieve adsorption dehydration is the best choice.
The zeolite molecular sieve used in this method is of type A or X, and type KA is the best. On the one hand, the polarity of type A zeolite molecular sieve is used. On the other hand, since the pore diameter of KA zeolite molecular sieve is about 0.3nm, water molecules can be free. Into the zeolite molecular sieve, the diameter of ethanol molecules greater than 0.3nm cannot enter. This zeolite molecular sieve dehydration process is the preferred process for industrial production of fuel ethanol.
(2) Purify pollutants in the air. With the rapid development of industry, the emissions of H2S, SO2, NOX and formaldehyde are increasing, and the pollution caused has brought serious harm to people's lives and the environment.