Removal of benzene and methyl ethyl ketone vapor: comparison of hypercrosslinked polymeric adsorbent with activated carbon.
A novel hypercrosslinked polymeric adsorbent (HY-1) with high surface area and specific bimodal pore size distribution in the regions of micropore (0.5-2.0 nm) and meso-macropore (30-70 nm) was prepared. Adsorption properties of benzene and methyl ethyl ketone (MEK) vapors onto HY-1 were investigated and compared with a commercial microporous activated carbon (m-GAC). The equilibrium adsorption data showed that the adsorption capacities of benzene and MEK on HY-1 were larger than those of m-GAC at the higher relative pressure. The Dubinin-Radushkevich (D-R) equation was found to fit the experimental data well. The isosteric enthalpy of adsorption for benzene and MEK were calculated. The m-GAC exhibited much higher values of ΔH(st) for the VOCs than HY-1 at the whole loading studied, which can lead to significant temperature rises during the adsorption step. The results of dynamic experiments revealed that HY-1 had a good dynamic adsorption capacity with a longer breakthrough time and shorter length of mass transfer zone due to its specific bimodal property. Therefore, HY-1 will be a particularly efficient and competitive adsorbent for VOCs recovery, especially at medium-high concentrations.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Road, Nanjing 210046, China. clong@nju.edu.cn
Chao
C
Long
Ying
Y
Li
Weihua
W
Yu
Aimin
A
Li
D000327:Adsorption; D001554:Benzene / Q000302:isolation & purification*; D002074:Butanones / Q000302:isolation & purification*; D002244:Carbon / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013816:Thermodynamics; D055549:Volatile Organic Compounds / Q000737:chemistry*
D002074:Butanones; D011108:Polymers; D055549:Volatile Organic Compounds; C005222:methylethyl ketone; D002244:Carbon; D001554:Benzene