发明申请
- 专利标题: Low-energy extractive distillation process for dehydration of aqueous ethanol
- 专利标题(中): 用于乙醇水溶液脱水的低能萃取蒸馏方法
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申请号: US11827896申请日: 2007-07-13
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公开(公告)号: US20090014313A1公开(公告)日: 2009-01-15
- 发明人: Fu-Ming Lee , Kuang-Yeu Wu , Lindsey Vuong , Fong-Cheng Su , Tzong-Bin Lin , Jyh-Haur Hwang , Hung-Chung Shen , Po-Sung Cheng , Tai-Ping Chang
- 申请人: Fu-Ming Lee , Kuang-Yeu Wu , Lindsey Vuong , Fong-Cheng Su , Tzong-Bin Lin , Jyh-Haur Hwang , Hung-Chung Shen , Po-Sung Cheng , Tai-Ping Chang
- 主分类号: C07C31/08
- IPC分类号: C07C31/08
摘要:
An energy-efficient extractive distillation process for producing anhydrous ethanol from aqueous/ethanol feeds containing any range of ethanol employs an extractive distillation column (EDC) that operates under no or greatly reduced liquid reflux conditions. The EDC can be incorporated into an integrated process for producing anhydrous ethanol used for gasoline blending from fermentation broth. By using a high-boiling extractive distillation solvent, no solvent is entrained by the vapor phase to the EDC overhead stream, even under no liquid reflux conditions. The energy requirement and severity of the EDC can be further improved by limiting ethanol recovery in the EDC. In this partial ethanol recovery design, ethanol which remains in the aqueous stream from the EDC is recovered in a post-distillation column or the aqueous stream is recycled to a front-end pre-distillation column where the ethanol is readily recovered since the VLE curve for ethanol/water is extremely favorable for distillation.
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