Biogas upgrading technologies: Energetic analysis and environmental impact assessment  

生物气脱碳提质过程的能耗分析和环境评价(英文)

作　　者：许亚晶 黄莺 武斌 张香平 张锁江 

机构地区：[1]Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences [2]School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences

出　　处：《Chinese Journal of Chemical Engineering》2015年第1期247-254,共8页中国化学工程学报（英文版）

基　　金：Supported by the National Basic Research Program of China(2013CB733506,2014CB744306);the National Natural Science Foundation of China(21036007,51274183)

摘　　要：Biogas upgrading for removing CO2 and other trace components from raw biogas is a necessary step before the biogas to be used as a vehicle fuel or supplied to the natural gas grid. In this work, three technologies for biogas upgrading, i.e., pressured water scrubbing(PWS), monoethanolamine aqueous scrubbing(MAS) and ionic liquid scrubbing(ILS), are studied and assessed in terms of their energy consumption and environmental impacts with the process simulation and green degree method. A non-random-two-liquid and Henry's law property method for a CO2 separation system with ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide([bmim][Tf2N]) is established and verified with experimental data. The assessment results indicate that the specific energy consumption of ILS and PWS is almost the same and much less than that of MAS. High purity CO2 product can be obtained by MAS and ILS methods, whereas no pure CO2 is recovered with the PWS. For the environmental aspect, ILS has the highest green degree production value, while MAS and PWS produce serious environmental impacts.Biogas upgrading for removing CO2 and other trace components from raw biogas is a necessary step before the biogas to be used as a vehicle fuel or supplied to the natural gas grid. In this work, three technologies for biogas upgrading, i.e., pressured water scrubbing（PWS）, monoethanolamine aqueous scrubbing（MAS） and ionic liquid scrubbing（ILS）, are studied and assessed in terms of their energy consumption and environmental impacts with the process simulation and green degree method. A non-random-two-liquid and Henry＇s law property method for a CO2 separation system with ionic liquid 1-butyl-3-methylimidazolium bis（trifluoromethylsulfonyl）imide（[bmim][Tf2N]） is established and verified with experimental data. The assessment results indicate that the specific energy consumption of ILS and PWS is almost the same and much less than that of MAS. High purity CO2 product can be obtained by MAS and ILS methods, whereas no pure CO2 is recovered with the PWS. For the environmental aspect, ILS has the highest green degree production value, while MAS and PWS produce serious environmental impacts.

关 键 词：Biogas upgrading Monoethanolamine aqueous scrubbing Pressured water scrubbing Ionic liquid Green degree 

分 类 号：TQ221.11[化学工程—有机化工]