|
|||||
|
|
Energy-Efficient Process with a Decanter to Separate Toluene-Methanol-Water Ternary Azeotropic Mixtures |
|
| Authors: | Yixin Ma Jun Gao Yong Wang Zhaoyou Zhu Yinglong Wang |
| Affiliation: | 1. Shandong University of Science and Technology, College of Chemical and Environmental Engineering, 266590 Qingdao, China
Qingdao University of Science and Technology, Shandong Key Laboratory of Biochemical Analysis, College of Chemistry and Molecular Engineering, 266042 Qingdao, China;2. Shandong University of Science and Technology, College of Chemical and Environmental Engineering, 266590 Qingdao, China;3. Qingdao University of Science and Technology, College of Chemical Engineering, 266042 Qingdao, China;4. Qingdao University of Science and Technology, College of Chemical Engineering, 266042 Qingdao, China Qingdao University of Science and Technology, Shandong Collaborative Innovation Center of Eco-Chemical Engineering, 266042 Qingdao, China |
| Abstract: | An extractive distillation process with two columns and a decanter was proposed to separate ternary toluene-methanol-water azeotropic mixtures in a previous study. Based on this process, six processes were established to explore further energy-efficient schemes to separate the ternary azeotropic system. The optimal parameters of the process were determined in terms of the minimum total annual cost (TAC). The processes with heat integration perform better than those with a side stream or thermal coupling in terms of energy savings and TAC reduction. A process in which both the feed stream of the extractive distillation column and the entrainer recovery column are preheated by the entrainer recycle stream can reduce energy consumption by up to 27.69 % and TAC by 21.36 %. |
| Keywords: | Extractive distillation Feed stream preheating Heat integration Total annual cost |