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Development of a correlation equation between the diesterification of maleic anhydride and the acidic ionic liquids nature

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Green Chemical Engineering 2023年第1期4卷 57-63页

作者： Yumei Liu Shengxin Chen Ran An Xingsheng Wang Ruixia Liu Beijing Key Laboratory of Ionic Liquids Clean Process CAS Key Laboratory of Green Process and EngineeringState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringInnovation Academy for Green ManufactureChinese Academy of SciencesBeijing100190China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing100190China School of Chemical Engineering and Energy Zhengzhou UniversityZhengzhou450001China Department of Chemistry School of Chemical EngineeringDalian University of TechnologyDalian116023China

The sustainable synthesis of dimethyl maleate via diesterification through the utilization of ionic liquid(IL)is of great ***,the relationship between the ILs nature and the reactivity of diesterification is still ***,a series of ILs with different structures were selected for the comprehensive investigation of *** acidity(H_(0))and Kamlet-Taft solvent parameters(hydrogen bond donor ability(α),hydrogen bond acceptor ability(β),and polarizability(π^(*)))of ILs were measured by UV–Visible spectroscopy,and the effects of them on the diesterification of maleic anhydride were also studied in *** results indicated that not only H0of the IL-based catalysis system,but also itsα,β,andπ^(*)influenced the reaction activity of ***,a quantifiable correlation was fitted between the natural logarithm of the rate constant and multiple parameters of ILs,indicating that the diesterification rate had a positive correlation with the H0,α,andπ^(*),and inverse correlation with theβof the IL.A plausible synergetic reaction mechanism for the excellent performance of[(HSO_(3))PMim][HSO_(4)]has been ***,this work thoroughly explored the relationship between the nature of ILs on diesterification in-depth,which will reveal the nature of diesterification in detail.

关键词： Multiparameter correlation equation diesterification Maleic anhydride Ionic liquids Kamlet-Taft solvent parameters

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Double-lipase Catalyzed Synthesis of Kojic Dipalmitate in Organic Solvents

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Chemical Research in Chinese Universities 2017年第6期33卷 903-907页

作者： WANG Zhiyuan LUO Wen FU Junying LI Zhibing WANG Zhongming LU Pengmei Key Laboratory of Renewable Energy of Chinese Academy of Sciences Guangdong Key Laboratory of New and Renewable Energy Research and Development Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 P. R. China

Kojic dipalmitate（KDP） was synthesized by the way of esterification ofpalmitic and kojic acids in organic solvent, with double-lipase as the biocatalyst. Four commercially available lipases（Amano PS, Novozym 435, Lipozyme TL IM and Lipozyme RM IM） were used to group six double-lipase combinations. These combinations were studied and Amano PS-Novozym 435 was found to have the best efficiency and was selected for optimizing the reaction conditions. The optimal reaction conditions were as follows. The mass ratio ofAmano PS to Novozyme 435 was 1：1.5, with stirring speed of 500 r/min, substrates molar ratio of 1：2, 50 ℃, 5%（mass fraction） catalyst dosage of kojic acid quantity and using acetone as co-solvent. Under these conditions, the diesterification of C5 and C7 hydroxyl groups of kojic acid molecule could be well catalyzed by double-lipase and realize a high KDP yield of 85%.

关键词： Kojic acid Palmitic acid Kojic dipalmitate Double-lipase catalysis diesterification

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