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Open AccessArticle

Comparison of the Economy and Controllability of Pressure Swing Distillation with Two Energy-Saving Modes for Separating a Binary Azeotrope Containing Lower Alcohols

1
School of Chemistry and Chemical Engineering, Yangtze Normal University, Fuling 408100, China
2
Key Laboratory of Gas Process Engineering, School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China
3
China Petroleum Engineering & Construction Corporation Southwest Company, Chengdu 610041, China
*
Author to whom correspondence should be addressed.
Processes 2019, 7(10), 730; https://doi.org/10.3390/pr7100730
Received: 30 July 2019 / Revised: 6 October 2019 / Accepted: 8 October 2019 / Published: 12 October 2019
(This article belongs to the Special Issue Process Optimization and Control)
The pressure swing distillation (PSD) with two different energy-saving modes are put forward to separate a binary azeotrope containing lower alcohols: benzene/methanol. A comparison of the economy and controllability for the partial and fully heat integrated pressure swing distillation (HIPSD) is made by detailed simulation analysis. The optimal operating parameters of partial and fully HIPSD processes are obtained by minimizing total annual cost (TAC). These results show that the fully HIPSD mode saves 5.88% TAC compared with the partial HIPSD mode. Meanwhile, this paper proposes that the composition slope profile can help to select the temperature control stage (TCS), when the temperature profile in the column is rising rapidly near the bottom and the maximum of temperature slope value occurs in the bottom of the column. Several control structures are developed to check the rationality of the selection of the TCS and evaluate the industrial application. These results illustrate the composition/temperature cascade control structure for the PSD with two energy-saving modes can both get good control performances, and the purities of benzene and methanol can be brought close back to the initial value. However, the fully HIPSD mode can only handle much smaller composition disturbances (<10%) compared with the partial HIPSD mode. Therefore, the selection of energy-saving modes for the separation process should weigh economy against controllability.
Keywords: economy; controllability; pressure swing distillation; azeotrope; benzene/methanol economy; controllability; pressure swing distillation; azeotrope; benzene/methanol
MDPI and ACS Style

Lv, L.; Li, H.; Zhang, Z.; Huang, H. Comparison of the Economy and Controllability of Pressure Swing Distillation with Two Energy-Saving Modes for Separating a Binary Azeotrope Containing Lower Alcohols. Processes 2019, 7, 730.

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