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In relation to this article, we declare that there is no conflict of interest.
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Received February 12, 2019
Accepted April 8, 2019
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Multiple transesterifications in a reactive dividing wall column integrated with a heat pump

Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
jaewlee@kaist.ac.kr
Korean Journal of Chemical Engineering, June 2019, 36(6), 954-964(11), 10.1007/s11814-019-0271-5
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Abstract

This study addresses a reactive dividing wall column (RDWC) integrated with a vapor recompression heat pump (VRHP). The reaction applied to the system contains two consecutive transesterifications of dimethyl carbonate (DMC) and ethanol, which yields methanol (MeOH) as a by-product, ethyl methyl carbonate as an intermediate product and diethyl carbonate (DEC) as the final desired product. DEC is the only stable node of the five component reacting mixture. The location of the reaction region and feed stages affects the purity of the top product because the unstable node product is not pure MeOH but DMC-MeOH azeotrope. The VRHP pressurizes the top gas product stream and the compressed gas provides heat to the bottom stream of the ethanol recovery section. The optimization procedure minimizes the power consumption of the compressor with respect to the gas flow rate. The energy consumption in the RDWC integrated with a VRHP is reduced by 32.1% and the total utility cost is also cut by 21.6% compared with the conventional RDWC.

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