碳酸乙烯酯的合成研究

以ＫＩ／ＰＥＧ络合物作催化剂，研究了环氧乙烷与ＣＯ２反应制备碳酸乙烯酯的反应性能。首次研究了不同分子量ＰＥＧ的作用，认为ＰＥＧ４００的效果最好，与冠醚相近，成本却大大降低。确定了ＥＣＣ－１催化剂存在下碳酸乙烯酯合成的最佳工艺条件：反应温度１２０—１４０℃，反应压力２．５—３．０ＭＰａ，ＥＣＣ－１／ＥＯ（ｍｏｌ比）０．００６—０．００９。在上述工艺条件下，碳酸乙烯酯收率可达９９％以上。催化剂活性随循环使用次数的增加而逐渐下降。研究首次发现，在两组份催化剂中加入适当第三组份，对催化剂活性有明显促进作用。本文对催化反应机理进行了初步探讨

Study on Synthesis of Ethylene Carbonate

The synthesis of ethylene carbonate from ethylene oxide and carbon dioxide catalyzed by KI/PEG complex catalyst was studied The effects of PEG of different molecular weight were studi ed;the best one is PEG 400,which has similar effects as crown ether,with much lower cost The optimum process conditions in the presence of ECC 1 catalyst were determined as follows:temperature 120-140℃;pressure 2 5-3 0MPa;mole ratio of ECC 1 to EO 0 006-0 009 The yield of ethylene carbonate is over 99% When the catalyst was recycled,the activity slowly diminished It was reported for the first time that the third component has a pronounced effect on improving the activity of the two component catalyst system The reaction mechanism was also discussed