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- Title
Sustainable wastewater treatment via extractive distillation process with ionic liquid as entrainer for the separation of ethyl acetate/isopropanol/water.
- Authors
Lingqiang Yan; Jinlong Li; Qing Ye; Xue Jian; Xinhao Li; Licheng Xie; Jianyu Zhang
- Abstract
To recycle isopropanol and ethyl acetate from wastewater by extractive distillation, 1-butyl-3-methylimidazolium acetate ([BM[M][OAc]) is considered to be an appropriate entrainer by comparing with ethylene glycol on VLE diagram and a-Profiles, respectively. Then, the extractive distillation processes with [BMIM] OAcl as entrainer are proposed. Since the degradation temperature of [BMIM][OAc] requires the entrainer recovery section of processes to operate under high vacuum, one-stage evaporator and one stripping column configuration is determined to recycle entrainer [BMIM][OAc]. After optimizing the IL processes, the heat integration technology is applied to the optimized processes. Compared conventional extractive distillation process with EG as entrainer, the heat integration assisted IL process with appropriate entrainer recovery configuration which uses IPA as stripping agent can reduce 24.76% of TAC, 45.64% of energy consumption and 45.52% of gas emission.
- Subjects
EXTRACTIVE distillation; ETHYL acetate; ISOPROPYL alcohol; WASTEWATER treatment; IONIC liquids; STRIPPERS (Chemical technology); ENERGY consumption; ETHYLENE glycol
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2022, Vol 160, p527
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2022.02.046