Energy-Saving Recovery of Acetone, Butanol, and Ethanol from a Prefractionator by the Salting-Out Method

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• 作者：Shaoqu Xie ; Conghua Yi ; Xueqing Qiu
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：November 14, 2013
• 年：2013
• 卷：58
• 期：11
• 页码：3297-3303
• 全文大小：295K
• 年卷期：v.58,no.11(November 14, 2013)
• ISSN：1520-5134

文摘

Thirty compounds including salts, saccharides, and alkalies have been investigated as possible salting-out agents to recover (acetone + butanol + ethanol) (ABE) from a prefractionator. The most promising salt is potassium carbonate. The mechanisms of salting-out by potassium carbonate are summarized as hydration and hydrogen-bond breaking. The thermodynamic study of salting-out by potassium carbonate has been investigated and shows that the salting-out process is endothermic and a process of entropy increment. The extractant of saturated potassium carbonate solution should be double that of the sketchy ABE solution. When the salting-out process is performed at 333.15 K instead of 298.15 K, equilibrium time is shortened from 9 to 3 min. Energy demand in an industrial application shows that salting-out produces 25.13 %, even 35.42 % less energy consumption than that of the conventional distillation process.