关键词: 有机朗肯循环, 效率, 线性加权法, 综合评价指标, 内部换热器

Abstract: As “green solvents”, ionic liquids have attracted much attention in the area of electrochemistry, organic chemistry and biochemistry. Recent studies focus on the synthesis and application of ionic liquids.However, the studies on degradation of ionic liquids which concerned with environment are not enough. The degradation of ionic liquids is required before the large-scale use of ionic liquids. In this study, chemical degradation method and biodegradation method are summarized. The chemical degradation is mainly achieved by UV/H₂O₂, Fe (Ⅲ)/H₂O₂ and electrolysis system. Biological degradation is achieved by introducing functional groups with enzymatic site, or using monooxygenase to oxidize the methyl terminal of alkyl side chain on the cation of ionic liquids into hydroxyl and aldehyde to form carboxylic groups, and then β-oxidation is proceed. Different chemical structures of ionic liquids is designed according to different mechanism between chemical and biological degradation, for example, changing the length of alkyl chain or introducing the functional groups that are easily degradable and selection of microorganism could improve efficiency of degradation of ionic liquids.

Key words: organic Rankine cycle, efficiency, linear weighted technique, comprehensive evaluation index, internal heat exchanger