Separation of an azeotropic mixture of dimethyl carbonate and methanol via partial heat integration pressure swing distillation

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• 作者：Qingrui Zhang ; Jiayao Peng and Kai Zhang
• 刊名：Asia-Pacific Journal of Chemical Engineering
• 出版年：2017
• 出版时间：January/February 2017
• 年：2017
• 卷：12
• 期：1
• 页码：50-64
• 全文大小：1748K
• ISSN：1932-2143

文摘

A method for dimethyl carbonate and methanol separation using pressure swing distillation is presented, and the optimum design is proposed by minimizing the total annual cost as the objective function. It is revealed that compared with no heat integration pressure swing distillation (HIPSD), partial HIPSD reduces the total annual cost by 20.01%. This paper presents a criterion for selection of the temperature control stage in the low-pressure column (LPC), the temperature profile of which is quite close to linear. Additionally, the influences of the temperature stage in the LPC on the dynamic responses in the partial HIPSD are investigated. The results show that the composition/temperature cascade control structure with stage 10 or 31 selected as the control stage in the LPC can achieve efficient controllability of the process, even for large feed flow rates and composition disturbances.