Distillation: processes – separatory – Distilling to separate or remove only water – From organic compound
Reexamination Certificate
2011-08-23
2011-08-23
Manoharan, Virginia (Department: 1771)
Distillation: processes, separatory
Distilling to separate or remove only water
From organic compound
C203S001000, C203S002000, C203S022000, C203S023000, C203S060000, C203S062000, C203S064000, C203S065000, C203S074000, C203S075000, C203S078000, C203S087000, C203S099000, C203SDIG013, C203SDIG019, C426S492000, C426S493000, C426S494000, C568S916000
Reexamination Certificate
active
08002953
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.
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Chang Tai-Ping
Cheng Po-Sung
Hwang Jyh-Haur
Lee Fu-Ming
Lin Tzong-Bin
AMT International Inc.
Cascio & Zervas
CPC Corporation, Taiwan
Manoharan Virginia
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