Low-energy extractive distillation process for dehydration of aqueous ethanol

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United States of America Patent

PATENT NO 8172987
APP PUB NO 20110266134A1
SERIAL NO

13184540

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Abstract

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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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Patent Owner(s)

  • AMT INTERNATIONAL, INC.;CPC CORPORATION, TAIWAN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chang, Tai-Ping Cihtong Township, TW 2 117
Cheng, Po-Sung Kaohsiung, TW 2 117
Hwang, Jyh-Haur Dali, TW 13 233
Lee, Fu-Ming Katy, US 55 775
Lin, Tzong-Bin Chiayi, TW 31 386
Shen, Hung-Chung Chiayi, TW 25 331
Su, Fong-Cheng Chiayi, TW 2 117
Vuong, Lindsey Allen, US 4 137
Wu, Kuang-Yeu Plano, US 30 376

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