摘要
酸性气体,如CO2、SO2和H2S的过量排放已经造成温室效应或酸雨等一系列环境危害。传统的溶剂吸收法由于技术成熟、成本低廉而得到了广泛应用,但它依然存在吸收剂再生能耗高、产物附加值低的缺点。近年来,一种新的吸收方式,相变吸收(即均相体系在吸收酸性气体后分为两相,酸性气体主要富集于其中一相),引起了人们的广泛关注。该法在吸收剂再生时只需要对其中的富相进行处理,从而减少了处理量,降低了解吸能耗,且富相中的酸性气体作为一种已经被改性的原料可以直接用于合成含硫或含碳化学品,从根本上避免再生过程。本文阐述了相变吸收的研究现状,依次对CO2、SO2以及H2S体系作了详细的介绍。将相变吸收分为液-液相变、液-固相变两类,介绍了两种相变吸收的研究进展,并分析比较了它们优缺点。在实际使用中,不同领域应综合考虑。目前,相变吸收实现了吸收剂对SO2气体的质量吸收量为1.56g SO2/g DMEA,对H2S的为0.205g H2S/g DBN,对CO2的摩尔吸收量为1.87mol CO2/mol(TETA/PEG200),与其他方法相比,相变吸收的吸收量非常高。这些结果表明相变吸收是一种极具潜力的酸性气体捕集方式。
Excessive emissions of acid gases,such as CO2,SO2,and H2S,have caused a range of threats to the environment,for instance,the greenhouse effect and acid rain.Traditional solvent absorption technology has been widely used due to its maturity and low costs.However,there are still some shortcomings,such as intensive energy consumption during the regeneration process,low-value compounds,etc.Recently,phase-change absorption,in which,the homogeneous solution forms two phases upon acid gas loading,and the acid gas mainly concentrates in one phase,has captured wide concern.This technology only needs to treat with the gas-rich phase during regeneration,resulting in the reduction of the regenerated amount and energy saving.Besides,the acid gas in rich phase could act as a modified raw material,which could be used to synthesize carbon/sulfur-containing chemicals,thus avoiding the regeneration process fundamentally.This review introduced the recent researches of phase-change absorption technology,which included CO2,SO2,and H2S gas.This technology was divided into liquid-liquid and liquid-solid phase-change absorption and its comprehensive advantages and disadvantages were summarized and compared.The two types of phase-change absorption technology should be considered comprehensively in practical application.At present,the mass absorption capacity was 1.56g SO2/g DMEA,0.205g H2S/g DBN and the molar absorption capacity was 1.87mol CO2/mol(TETA/PEG200)in phase-change absorption process,which is reported as the super high value in the literature.This indicates phase-change absorption is a promising method in acid gas capture.
作者
赵文波
李广振
许胜超
李雪霏
王志友
ZHAO Wenbo;LI Guangzhen;XU Shengchao;LI Xuefei;WANG Zhiyou(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China;China Electric Power Construction Group Shandong Electric Power Construction First Engineering Co.,Ltd.,Hebei Branch,Shijiazhuang 050040,Hebei,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2021年第1期401-414,共14页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(21666011)
云南省万人计划。
关键词
酸性气体捕集
相变吸收
有机溶剂
过程强化
capture of acid gas
phase-change absorption
organic solvent
process intensification