Design and Control of Dimethyl Carbonate−Methanol Separation via Extractive Distillation in the Dimethyl Carbonate Reactive-Distillation Process
Design and Control of Dimethyl Carbonate−Methanol Separation via Extractive Distillation in the Dimethyl Carbonate Reactive-Distillation Process
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DOI：
10.1021/ie901157g
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发表时间：
2010-01
影响因子：
4.2
通讯作者：
Kai-Yi Hsu;Yuan-Chang Hsiao;I. Chien
中科院分区：
文献类型：
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作者：
Kai-Yi Hsu;Yuan-Chang Hsiao;I. Chien
碳酸二甲酯是一种环境友好、可生物降解的化学物质。它可以通过甲醇与碳酸乙烯酯的酯交换反应生成另一种有用的产物乙二醇。反应精馏塔可用于碳酸乙烯与过量甲醇的完全转化。副产物乙二醇是底部产物，而反应精馏塔的顶部产物是碳酸二甲酯和甲醇的混合物，接近共沸组成。本文提出了一种经济的萃取精馏分离工艺，以获得纯碳酸二甲酯产品和纯甲醇，并将其回收到反应精馏塔。本文提出了一个非常简单的程序，以便在进行严格的过程模拟之前快速比较备选夹带剂。苯胺是一种非常有效的夹带剂，可以提高甲醇和二甲基甲烷的相对挥发性。
Dimethyl carbonate is an environmentally benign and biodegradable chemical. It can be produced by a transesterification reaction of methanol with ethylene carbonate, coproducing another useful product, ethylene glycol. A reactive distillation column can be utilized for the complete conversion of ethylene carbonate with methanol in excess. The coproduct, ethylene glycol, is the bottom product while the top product of this reactive distillation column is a mixture of dimethyl carbonate and methanol close to the azeotropic composition. In this paper, an economical separation process via extractive distillation is proposed to obtain pure dimethyl carbonate product and also pure methanol to be recycled to the reactive distillation column. A very simple procedure is proposed in this paper for the quick comparison of alternative entrainer candidates before rigorous process simulation is conducted. Aniline is found to be a very effective entrainer to enhance the relative volatility between methanol and dimethyl c...