高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (12): 2309.

• 研究论文 • 上一篇    下一篇

超临界条件下碳酸乙烯酯的均相催化合成

吕小兵, 张华, 何仁   

  1. 大连理工大学化学工程学院, 精细化工国家重点实验室, 大连116012
  • 收稿日期:2001-11-14 出版日期:2002-12-24 发布日期:2002-12-24
  • 通讯作者: 吕小兵(1970年出生),男,博士,讲师,主要从事超临界流体化学方面的研究.E-mail:ho-mail@163.com E-mail:ho-mail@163.com
  • 基金资助:

    国家自然科学基金(批准号:20204002)资助

Homogeneous Catalytic Synthesis of Ethylene Carbonate Under Supercritical Condition

LU Xiao-Bing, ZHANG Hua, HE Ren   

  1. U¨\) Xiao-Bing, ZHANG Hua, HE Ren *(State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116012, China
  • Received:2001-11-14 Online:2002-12-24 Published:2002-12-24

摘要: 合成了几种四齿Schiff碱铝配合物,并用其在超临界条件下均相催化二氧化碳和环氧乙烷反应合成碳酸乙烯酯.其中,以轴向为乙氧基链的Schiff碱铝配合物的催化活性最高.在一定条件下,由于环氧乙烷与超临界二氧化碳具有混溶性,使得环加成反应在超临界条件下比非临界条件下进行得更快.反应温度对催化活性有很大影响.碱性配体如1-甲基咪唑的存在能有效地提高这些铝配合物的催化性能.同时,基于低温下的一些光谱数据,提出了可能的反应机理.

关键词: 超临界二氧化碳, 环氧乙烷, 碳酸乙烯酯, Schiff碱铝配合物, 环加成

Abstract: Tetradendate Schiff-base aluminum complexes were prepared and used as the catalysts for synthesizing ethylene carbonate from supercritical CO2 and ethylene oxide mixture. Among them, SalenAl(OCH2CH2)3Cl, possessing a long oxyethylene chain, was found to be more effective. Because of high miscibility of ethylene oxide in supercritical CO2 under employed conditions, the cycloaddition of CO2 with ethylene oxide under a supercritical condition shows a higher rate than that under a non-supercritical condition. The catalytic activities of these aluminum complexes can be markedly enhanced in the presence of a Lewis base, such as 1-MeIm. Also, the possible catalytic mechanism was proposed, based on some spectral data at a low temperature.

Key words: Supercritical CO2, Ethylene oxide, Ethylene carbonate, Schiff-base aluminum complexes, Cycloaddition

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