关键词: volume-expanding and pressure-reducing adsorption;adsorption isotherm;activated carbon; polymeric adsorbent;supercritical fluid

Abstract: A method named as "volume-expanding and pressure-reducing adsorption" is proposed. It can
be usedto measure the isotherms under supercritical condition. The adsorption isotherms of
phenol on activated carbonsand polymeric adsorbents are estimated and compared respectively
for the systems of "phenol-activated carbon-supercritical fluid CO2" and "phenol-polymeric
adsorbent-supercritical fluid CO2". The results show that theamount of phenol adsorbed on
the activated carbons and the polymeric adsorbents under the supercritical conditionis much
less than that under the general condition, which can be utilized to develop a technology
regenerating theactivated carbon with supercritical fluid. Moreover, the effects of ethyl
alcohol, used as the third component, on theisotherms of phenol on the activated carbons
and polymeric adsorbents under the supercritical condition are alsoinvestigated.

Key words: volume-expanding and pressure-reducing adsorption, adsorption isotherm, activated carbon, polymeric adsorbent, supercritical fluid