甲基磺酸亚铈催化合成柠檬酸三(2-乙基)己酯的研究

合成了甲基磺酸亚铈,研究了以甲基磺酸亚铈催化柠檬酸和2-乙基己醇的酯化反应,考察了反应温度、催化剂用量、醇酸摩尔比等因素对反应结果的影响,对合成的产品进行了红外光谱分析.实验结果表明,甲基磺酸亚铈催化合成柠檬酸三(2-乙基) 己酯的最佳反应条件为:n (2-乙基己醇):n(柠檬酸)＝3.60:1,催化剂用量0.25% (以酸的物质的量计),反应温度120℃～130℃,负压操作.在最佳反应条件下,柠檬酸三(2-乙基)己酯收率在98.0%以上.反应结束后,催化剂通过简单的相分离即可重复使用.甲基磺酸亚铈重复使用5 次后,其催化活性无明显下降,产品收率仍可达到90%以上.

Study on Catalytic Synthesis of Tri(2-ethylhexyl) Citrate with Cerous Methanesulfonate

Cerous methanesulfonate was synthesized and used as the catalyst in the esterification of citric acid with 2-ethylhexanol. The effects of reaction temperature,amount of catalyst and alcohol/acid molar ratio have been investigated. The products were analyzed by means of FT-IR. The yield can be over 98.0% under the optimum conditionsthatmolar ratio of 2-ethylhexanol to citric acid,3.60:1; amount of catalyst,0.25% (molar percentage of citric acid) and reaction temperature,120℃～130℃,reaction pressure: vacuum.The catalyst can be reused by simple phase-separation after reaction. It is used repeatedly for 5times without obvious loss of activity and with the yield still over 90.0%.