超临界条件下CO_2与CH_3OH的催化酯化

CATALYTIC ESTERIFICATION FOR CARBON DIOXIDE AND METHANOL UNDER SUPERCRITICAL CONDITION

在超临界条件下，采用高压搅拌釜研究了ＣＯ２与ＣＨ３ＯＨ催化合成生成碳酸二甲酯的反应。探索了催化剂类型与用量，考察了温度、压力与反应时间对反应的影响，定量研究了产物浓度与反应温度、压力、时间的关系。对临界反应现象与反应机理作出初步解释。

Catalytic synthesis of dimethyl carbonate from carbon dioxide and methanol under high pressure has been investigated in a agitated reactor The type and amount of catalysts have also been studied Mg(OCH_3)_2 has been used as catalysts The optimum ratio of Mg powder to methanol is 005 The effects of temperature, pressure and reaction time on reaction results were measured The quantitative relations such as DMC concentration with reaction temperature, pressure and time were studied individually It shows that the reaction rate obeys the law of the first order reactions The optimum reaction pressure and temperature are 75008MPa and 17831℃ respectively The preliminary explanation was made for the supercritical phenomena and reaction mechanism in the experiments