Cao Yanbing, Fei Xiaoqi, Wu Xuanhao, Wang Haiqiang, Wu Zhongbiao
Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental Resources Science, Zhejiang University Hangzhou 310058 P. R. China
Zhejiang Tianlan Environmental Protection Technology Co., Ltd., Zhejiang Provincial Engineering Research Center of Industrial Boiler Furnace Flue Gas Pollution Control Hangzhou 310058 P. R. China.
RSC Adv. 2023 May 18;13(22):15165-15173. doi: 10.1039/d3ra01754k. eCollection 2023 May 15.
Dichloromethane (DCM), a typical representative of chlorinated volatile organic compounds (CVOCs), is usually exhausted along with other volatile organic compounds (VOCs), such as toluene and ethyl acetate, in industrial factories. To address the complexity of the components, the large variation in concentration of each component and the water content of the exhaust gases emitted from the pharmaceutical and chemical industries, the adsorption characteristics of DCM, toluene (MB), and ethyl acetate (EAC) vapors on hypercrosslinked polymeric resins (NDA-88) were studied by dynamic adsorption experiments. Furthermore, the adsorption characteristics of NDA-88 for binary vapor systems of DCM-MB and DCM-EAC at different concentration ratios and the nature of the interaction force with the three VOCs were explored. NDA-88 was found to be suitable for treating binary vapor systems of DCM mixed with low concentrations of MB/EAC, and a small quantity of adsorbed MB or EAC would promote the adsorption of DCM by NDA-88, which is attributed to the microporous filling phenomenon. Finally, the influence of humidity on the adsorption performance of binary vapor systems for NDA-88 and the regeneration adsorption performance of NDA-88 were investigated. The presence of water steam shortened the penetration times of DCM, EAC, and MB, regardless of whether it was in the DCM-EAC or DCM-MB two-component systems. This study has identified a commercially available hypercrosslinked polymeric resin NDA-88, which has excellent adsorption performance and regeneration capacity for both single-component DCM gas and a binary mixture of DCM-low-concentration MB/EAC, providing experimental guidance for the treatment of emissions from pharmaceutical and chemical industries by adsorption.
二氯甲烷（DCM）是氯代挥发性有机化合物（CVOCs）的典型代表，在工业工厂中通常与其他挥发性有机化合物（VOCs）一起排放，如甲苯和乙酸乙酯。为了解决制药和化工行业排放废气中成分复杂、各成分浓度变化大以及含水量高等问题，通过动态吸附实验研究了二氯甲烷、甲苯（MB）和乙酸乙酯（EAC）蒸汽在超交联聚合物树脂（NDA - 88）上的吸附特性。此外，还探索了NDA - 88在不同浓度比下对DCM - MB和DCM - EAC二元蒸汽体系的吸附特性以及与三种VOCs相互作用力的性质。结果发现NDA - 88适用于处理低浓度MB/EAC与DCM混合的二元蒸汽体系，少量吸附的MB或EAC会促进NDA - 88对DCM的吸附，这归因于微孔填充现象。最后，研究了湿度对NDA - 88二元蒸汽体系吸附性能的影响以及NDA - 88的再生吸附性能。无论在DCM - EAC还是DCM - MB两组分体系中，水蒸气的存在都会缩短DCM、EAC和MB的穿透时间。本研究确定了一种市售的超交联聚合物树脂NDA - 88，它对单组分DCM气体以及DCM - 低浓度MB/EAC二元混合物都具有优异的吸附性能和再生能力，为制药和化工行业废气吸附处理提供了实验指导。
