Invention Grant
- Patent Title: Low-energy extractive distillation process for dehydration of aqueous ethanol
- Patent Title (中): 用于乙醇水溶液脱水的低能萃取蒸馏方法
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Application No.: US13184540Application Date: 2011-07-17
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Publication No.: US08172987B2Publication Date: 2012-05-08
- Inventor: Fu-Ming Lee , Tzong-Bin Lin , Jyh-Haur Hwang , Hung-Chung Shen , Kuang-Yeu Wu , Lindsey Vuong , Fong-Cheng Su , Po-Sung Cheng , Tai-Ping Chang
- Applicant: Fu-Ming Lee , Tzong-Bin Lin , Jyh-Haur Hwang , Hung-Chung Shen , Kuang-Yeu Wu , Lindsey Vuong , Fong-Cheng Su , Po-Sung Cheng , Tai-Ping Chang
- Applicant Address: US TX Plano TW Taipai
- Assignee: AMT International Inc.,CPC Corporation, Taiwan
- Current Assignee: AMT International Inc.,CPC Corporation, Taiwan
- Current Assignee Address: US TX Plano TW Taipai
- Agency: Cascio & Zervas
- Main IPC: B01D3/40
- IPC: B01D3/40 ; B01D3/42 ; C07C29/84 ; C07C29/94 ; C12G3/12

Abstract:
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.
Public/Granted literature
- US20110266134A1 Low-Energy Extractive Distillation Process for Dehydration of Aqueous Ethanol Public/Granted day:2011-11-03
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