双组分VOCs在吸附树脂上的吸附穿透特性

选取超高交联吸附树脂（H-resin）和大孔吸附树脂（M-resin）作为吸附剂,采用固定床吸附法研究了单、双组分的正戊烷和环己烷在2种不同孔结构吸附树脂上的吸附穿透特性.结果表明：2种吸附树脂对正戊烷和环己烷的吸附主要依靠色散力作用,吸附树脂对摩尔极化率大的环己烷有更优秀的吸附能力.双组分吸附实验中,由于富含微孔的H-resin对不同组分VOCs的吸附作用力差别大,发生环己烷取代正戊烷的现象,并且取代随环己烷浓度升高而更加显著,但吸附温度由30升至50℃过程中,取代现象减弱.M-resin的孔主要分布在中、大孔区,对环己烷和正戊烷的吸附作用力相近,因而正戊烷和环己烷在M-resin上始终为共同吸附.

Adsorption breakthrough of binary VOCs on polymeric resins

In this work, adsorption breakthrough curves of single component and binary n-pentane and cyclohexane on hypercrosslinked polymeric resin (H-resin) and macroporous polymeric resin (M-resin) were investigated, respectively. The results showed that adsorption of n-pentane and cyclohexane on two polymeric resins was mainly based on the dispersion force. Polymeric resins exhibited the higher adsorption capacity for cyclohexane, which had a higher molar polarization. For adsorption of binary n-pentane and cyclohexane on H-resin, the phenomenon of "roll-up" (C/C₀>1for n-pentane) was observed in the breakthrough curves since H-resin had stronger adsorption affinity to cyclohexane than to n-pentane. Moreover, the higher the concentration of cyclohexane was, the more significant the "roll-up" was. In addition, the competition phenomenon became insignificant with increasing the adsorption temperature from 30 to 50℃. However, co-adsorption was always observed for binary adsorption of n-pentane and cyclohexane on M-resin because M-resin, whose pore was mainly distributed in the region of macropore and mesopore, had similar adsorption affinity to cyclohexane and n-pentane.