一种测量超临界条件下苯酚吸附等温线方法

超临界吸附相平衡是超临界吸附／色谱分离过程设计的基础,通常,研究超临界吸附相平衡的实验不仅需要在高压下操作,而且需使用耐高压的检测器,本文提出一种测量超临界条件下吸附相平衡关系的“扩容减压吸收法”方法,它不需要耐高压检测器,以“苯酚－活性炭－超临界二氧化碳流体”为体系,测定了苯酚在活性炭－超临界二氧化碳流体之间的吸附相平衡关系,测定了苯酚在两种活性炭上的超临界吸附等温线,比较了苯酚在超临界条件和常

METHOD OF ESTIMATING THE ISOTHERM OF PHENOL ON ACTIVATED CARBONS UNDER SUPERCRITICAL CONDITION

Adsorption isotherms under supercritical fluid (SCF) condition are important data for the design of SCF adsorption/chromatography separation. Usually, the estimation of the adsorption isotherm under supercritical condition needs to be performed under the condition of high pressure, and a high pressure UV detector is needed. In this work, a method named as "volume-expanding and pressure-reducing adsorption" is proposed, which can be used to measure the isotherm under the supercritical condition without needing the high pressure UV detector. The adsorption isotherms of phenol on two kinds of activated carbons were estimated for the system of "phenol-activated carbons-SCF CO2". The adsorption isotherms of the phenol on the activated carbons under the SCF condition and general condition are compared. Results show: the amount adsorbed of the phenol on the activated carbons under the SCF condition is much less than that under the general condition, which can be utilized to develop a technology of regenerating the activated carbon with SCF.