Recovery of acids from aqueous solutions
申请(专利)号:
US05/365506
申请日期:
19730531
公开/公告号:
US04275234A
公开/公告日期:
19810623
申请(专利权)人:
IMI (TAMI) INSTITUTE FOR RESEARCH AND DEVELOPMENT
被引量:
摘要:
Acids are recovered from their aqueous solution by an extraction process comprising a first extraction stage at which the aqueous solution is contacted with a water-immiscible extractant comprising a water- immiscible organic solvent and, dissolved therein, at least one secondary or tertiary amine in which the aggregate number of carbon atoms is at least 20; and a back-extraction stage in which the organic extract, separated from the original aqueous solution, is stripped with an aqueous liquid at a temperature which is higher by at least 20° C. than the temperature of the first extraction stage. The stripped extractant can be recycled to the first extraction stage for making the process continuous, and if so recycled, is cooled on its way to the extraction stage. A preferred field of application is the recovery of organic acids produced by fermentation from the fermentation broth, e. g. citric acid.
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