KF/MgO催化醇解制备碳酸二甲酯的超声强化研究
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摘要
以碳酸乙烯酯和甲醇为原料、KF/MgO为催化剂,制备了碳酸二甲酯,对碳酸乙烯酯醇解制备碳酸二甲酯反应过程中影响碳酸乙烯酯转化率的因素进行了考察,对比了超声波与机械搅拌条件对碳酸乙烯酯转化率的影响。实验结果表明,超声波与机械搅拌相比,超声波能够强化碳酸乙烯酯的醇解反应,可以提高碳酸乙烯酯转化率,使反应稳定时间由90 min缩短为30 min,催化剂的加入量(w)由1.5%减少为1.0%、醇酯摩尔比由9∶1降为6∶1。
Ehylene carbonate and methanol were used as raw materials and KF/MgO was used as catalyst to synthesize dimethyl carbonate. The effects of various factors on the conversion of ethylene carbonate in the preparation of dimethyl carbonate by alcoholysis were studied and an investigation was conducted to compare the effects of ultrasonic and mechanical stirring conditions on ethylene carbonate conversion. The experimental results show that compared with mechanical stirring,ultrasonic enhanced the alcoholysis reaction of ethylene carbonate significantly,under which the conversion of ethylene carbonate was enhanced. Furthermore,the reaction time was reduced from 90 min to 30 min,the addition amount of catalyst was decreased from 1.5%(w) to 1.0%(w),and alcohol ester molar ratio was decreased from 9∶1 to 6∶1.
Ehylene carbonate and methanol were used as raw materials and KF/MgO was used as catalyst to synthesize dimethyl carbonate. The effects of various factors on the conversion of ethylene carbonate in the preparation of dimethyl carbonate by alcoholysis were studied and an investigation was conducted to compare the effects of ultrasonic and mechanical stirring conditions on ethylene carbonate conversion. The experimental results show that compared with mechanical stirring,ultrasonic enhanced the alcoholysis reaction of ethylene carbonate significantly,under which the conversion of ethylene carbonate was enhanced. Furthermore,the reaction time was reduced from 90 min to 30 min,the addition amount of catalyst was decreased from 1.5%(w) to 1.0%(w),and alcohol ester molar ratio was decreased from 9∶1 to 6∶1.
引文
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[3] Tan Hongzi,Wang Zhiqiao,Xu Zhongning,et al. Review on the synthesis of dimethyl carbonate[J]. Catal Today,2018,316:2-12.
[4]骆铭，韩生，何忠义，等.碱性离子液体催化合成碳酸二丙酯[J].石油化工，2011,40(12):1316-1320.
[5]杨彩娟.浆料催化精馏酯交换合成DMC的研究[D].天津：天津大学，2006.
[6]钱锦华，王公应，王庆印，等.国内外碳酸二甲酯酯交换反应催化剂研究进展[J].分子催化，2005,19(4):315-320.
[7]陈冠益，赵鹏程，王祎，等. KF/MgO固体碱催化酯化制备生物柴油实验研究[J].太阳能学报，2015,36(10):2536-2542.
[8]范燕平，王庆印，杨先贵，等. KF/MgO催化碳酸二甲酯与月桂醇酯交换合成碳酸二月桂酯[J].催化学报，2010,31(1):2536-2542.
[9]栾振威.超声空化与固体颗粒交互作用机理[D].天津：天津大学，2015.
[10]徐勇士，杭方学，李大成，等.超声强化酯交换合成蔗糖月桂酸单酯的工艺[J].化工进展，2013,32(7):1656-1660.
[11]刘丽艳，张瀚仁，罗英鹏，等.超声波辅助煎炸废油酯交换制备生物柴油[J].中国油脂，2014,39(11):52-56.
[12]钱卫卫，韩萍芳，吕效平.超声作用下KF/CaO催化酯交换反应制备生物柴油[J].燃料化学学报，2010,38(1):52-56.
[13]任庆功，阎杰，黄冠华，等.超声强化纳米KF/γ-Al2O3催化酯交换制备生物柴油[J].中南大学学报：自然科学版，2010,41(3):883-889.
[14]李永荣，辛忠，刘群，等.负载型固体碱催化棕榈油酯交换制备生物柴油[J].石油化工，2009,38(7):795-800.
[15]王瑞红.固体碱催化法制备生物柴油的工艺研究[D].天津：天津大学，2007.
[16]杨永辉.超声强化在催化剂制备及催化反应中的应用[J].化工技术与开发，2012,41(11):32-34.
[17]杜志达，孙熙椿.液体饱和蒸汽压的测定实验数据处理[J].江西师范大学学报：自然科学版，1992(2):174-177.
[18]刘丽明，鲁建春，齐鸣斋.甲醇与碳酸乙烯酯反应体系热力学分析[J].上海化工，2009,34(12):7-10.
[19]杨志刚，屈撑囤，张宁生，等.超声波对固体颗粒表面性质的影响[J].西安石油大学学报：自然科学版，2005,20(6):53-55.