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Molecular sieve adsorption principle

The concertation of molecules ofa sbstace on the surface of a porous soid is aled adsorption A soid mater has an unsaturated feld of torce on its surace, and is anae gf acionworesonds to the diameter oi the moecule, Thereore it has a ceram adsorpton efect on the oas molecules n contact wth the sold surace.owever. ony porous matenas with areinternal surface area have significant adsorption effect.

tis not enouh for adsordent to ave adsorotion caacity only Adsorbent must have selective adsorption abity to achieve the separation and purficaton of each comionent in the oasthais to say. adsorbent must have diferent adsorption ability to each component in the qas.The adsorbabilty of adsorben to vaos gases depends on the composition and stucture of the adsorben, the size ad polaty of the gas molecules and the adsorption condtons such aemperature,oresure, etc,_The pore szes of d ferent adsordents are dlferent. The efectie oore srzes of severa molecular seves are isted in table 1 Thereore, only molecular sieves maywse ore size efiect to seoaraie arous oases n order to seoarate the comoonents in the oas, the adsordent wih oroder oore diameter sthoud be seleced accordino to the molecua

diameter of each component

in aditon to pore size efect the selective adsoption capacily of molecular sieve aso vares wth the polarty and other propertes of gas molecules For example, the molecwiar size of ccand aon is similar since co is a olr molecue and aron is a no-alar molecule, the ecuibrum adsopton canaciy of co n 4A moecular seve s much aroer than that of aron.icand argon are mived gases, CO wil be preferentaly adsorbed when passing through 4A adsorpton bed.When selecting various components of the gas mxture ftor adsorption and separatonthe appropriate molecular sieve should be selected according to the required adsorption sequence of each component

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4a molecular sieve desiccant