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化工学报  2015 

甲醇为原料联合制备碳酸二甲酯、甲缩醛和二甲醚反应体系热力学计算及节能分析

DOI: 10.11949/j.issn.0438-1157.20141673, PP. 2377-2386

Keywords: 碳酸二甲酯,甲缩醛,二甲醚,模拟,生产,化学过程

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Abstract:

围绕碳酸二甲酯的高效、绿色、安全、节能合成目标,构建了联合生产碳酸二甲酯、甲缩醛和二甲醚反应体系及节能工艺。借助AspenPlus软件对独立反应及复杂体系进行了热力学分析。由结果可知,升高反应压力或降低温度可明显提高碳酸二甲酯的平衡组成;与甲缩醛和二甲醚合成工艺相耦合后,可大幅提升甲醇平衡转化率,由0.5%~5.9%提高到91.7%~96.3%。根据热力学计算结果和动力学因素,提出顺序生产碳酸二甲酯、甲缩醛和二甲醚的串联催化反应器工艺。甲缩醛和二甲醚的分离采用简单精馏方式,碳酸二甲酯和水共沸物的分离采用变压精馏,3种产品的质量浓度均可达到99%以上。可有效解决单独生产碳酸二甲酯和甲缩醛生产中原料循环量大、能耗高和易爆炸等缺陷。

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