复合盐析剂盐析粗醇中的乙醇、丙酮和正丁醇
广东省食品药品职业技术学校, 实训中心, 广东广州 510663
| 摘 要： | 本论文介绍了生物丁醇发酵液经醪塔处理后粗醇中的乙醇、丙酮和正丁醇的盐析技术。针对生物丁醇发酵液中总溶剂浓度低，回收困难且能耗大等问题，本论文分别研究了不饱和复合盐，盐析温度，盐析剂与粗醇的体积比对生物丁醇体系除水的影响。根据有机相中水的含量这个指标，从多种复合盐中选出最有利于生物丁醇除水的盐析剂，研制了由水、复合盐类组成的复合盐析萃取剂。研究结果表明，不饱和盐对正丁醇-丙酮-乙醇-水体系萃取效果不佳。用由复合盐类、水复合萃取剂萃取正丁醇-丙酮-乙醇-水体系，能增大正丁醇、丙酮和乙醇的质量分数，达到分离提浓正丁醇、丙酮和乙醇的目的。一级逆流萃取后有机相中正丁醇质量分数就由26%提高到64%以上，丙酮质量分数由10%升高到21%以上，乙醇质量分数由4%上升到9%以上。复合盐析剂能达到高效除水的目的。 |
| 关 键 词： | 生物丁醇; 盐析; 粗醇; 分离 |
| DOI： | 10.57237/j.cse.2023.01.002 |
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收稿日期: 2023-05-29
接受日期: 2023-06-20
在线出版日期: 2023-06-21
Composite Salting-out Agent for the Salting-out of Ethanol, Acetone and n-butanol in the Crude Alcohol
Training Center, Guangdong Food and Drug Vocational Technical School, Guangzhou 510663, China
| Abstract: | This paper introduces the salting-out technology of ethanol, acetone and n-butanol in the crude alcohol after the bio-butanol fermentation liquid is processed by the mash tower. Aiming at the problems of low total solvent concentration, difficult recovery and high energy consumption for the bio-butanol fermentation broth separation, this paper studied the effects of unsaturated composite salts, salting-out temperature, and the volume ratio of salting-out agent to crude alcohol on the water removal of bio-butanol system. According to the index of water content in the organic phase, the most beneficial salting-out agent for water removal was selected from various composite salts. A salting-out extractant composed of water and composite salts was developed. The results showed that the extraction effect of unsaturated salt was not good for n-butanol-acetone-ethanol-water system. The n-butanol-acetone-ethanol-water system is extracted with a composite salt and water extractant, which can increase the mass fraction of n-butanol, acetone and ethanol, and achieve the purpose of separating and concentrating n-butanol, acetone and ethanol. After the primary countercurrent extraction, the mass fraction of n-butanol in the organic phase increased from 26% to over 64%, the mass fraction of acetone increased from 10% to over 21%, and the mass fraction of ethanol increased from 4% to over 9%. The composite salting-out agent can achieve the purpose of efficient water removal. |
| Keywords: | Biobutanol; Salting-out; Crude Alcohol; Separation |
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