RESEARCH ARTICLE


Analysis of Different Pressure Thermally Coupled Extractive Distillation Column



Lanyi Sun*, Kang He, Yuliang Liu, Qiuyuan Wang, Dingding Wang
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao266580, Shandong, China


© 2017 Sun et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao266580, Shandong, China; Tel.: +86-138-5420-8340; Fax.: +86-0532-8698-1787; E-Mail: sunlanyi@upc.edu.cn


Abstract

In this contribution, a different pressure thermally coupled extractive distillation process has been applied on the separation of propylene and propane with aqueous acetonitrile (ACN) solution as entrainer. The novel distillation pro-cess integration is the combination of different pressure thermally coupled distillation (DPTCD) and extractive distillation (ED). Both the new process and the conventional process have been simulated in Aspen Plus. Sensitivity analysis has been conducted to select an appropriate compression ratio and other operating parameters based on the priority that the propylene product purity is 99.2 wt % and less energy consumption. The influence of the proposed distillation column on energetic and economic aspects is evaluated through intensive comparison against the conventional stand-alone column, and better performance is achieved with up to 46.02% energy saving and close to 9.7% saving in total annual cost (TAC).

Keywords: Different pressure thermally coupled, Extractive distillation, Propylene, Propane, Energy saving, TAC.