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化工学报  2015 

Zn(OAc)2/AC催化固定床上CO2与1,2-丙二醇合成碳酸丙烯酯及其反应机理

DOI: 10.11949/j.issn.0438-1157.20141163, PP. 567-575

Keywords: 1,2-丙二醇,二氧化碳,碳酸丙烯酯,固定床,催化剂,反应机理

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Abstract:

以负载型乙酸锌为催化剂,在固定床上实现了CO2和1,2-丙二醇(PG)合成碳酸丙烯酯(PC)反应。考察了不同载体和负载量对负载型乙酸锌催化性能的影响以及反应条件对PC合成反应的影响。结果表明:负载量为40%(质量分数)的Zn(OAc)2/AC催化性能最好。CO2与PG合成PC适宜的反应条件为:PG、乙腈和CO2的摩尔比为1:1.8:11,CO2压力4.0MPa,反应温度160℃和液空速0.9h-1。在此条件下,PC收率和选择性分别为6.3%和49.0%。采用原位红外结合设计实验研究了无水乙酸锌分别与CO2和PG之间的相互作用,发现CO2与乙酸锌之间的化学吸附比较弱,而PG与乙酸锌之间的化学吸附较强,能够活化PG。据此推测了乙酸锌催化CO2与PG合成PC的反应机理。

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