期刊
AICHE JOURNAL
卷 61, 期 12, 页码 4470-4480出版社
WILEY-BLACKWELL
DOI: 10.1002/aic.15009
关键词
extractive distillation; benzene; thiophene; ionic liquids; UNIFAC model; process intensification
资金
- National Natural Science Foundation of China [21476009, 21406007, U1462104]
The separation of benzene and trace thiophene by extractive distillation was intensified in two aspects, that is, selection of a suitable entrainer and improvement of the process. The mixture of dimethylformamide (DMF) and an ionic liquid (IL) was chosen as the entrainer. Vapor-liquid equilibrium (VLE) experiments using pure DMF and a mixed entrainer were conducted, and UNIFAC model for ILs was extended to the benzene-thiophene-DMF-IL system. The results demonstrated that volatilization loss of DMF in the vapor phase was significantly reduced by adding IL. Moreover, an improved process with only four columns using a mixed entrainer was proposed. The results indicated that the improved process is more promising for decreasing energy consumption and equipment investment compared with the conventional six-column process. The total heat duties of reboilers and condensers was decreased by 6.47% and 6.41%, respectively. The process intensification strategy may be directly extended to separate trace components of other systems. (c) 2015 American Institute of Chemical Engineers
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