点击次数：

论文类型：期刊论文

发表时间：2013-09-01

发表刊物：PROCESS BIOCHEMISTRY

收录刊物：SCIE、EI、Scopus

卷号：48

期号：9

页面范围：1381-1386

ISSN号：1359-5113

关键字：1,3-Propanediol; Continuous countercurrent extraction; Packed column; Salting-out extraction system

摘要：The possibility of continuous extraction of 1,3-propanediol in a experimental packed column was investigated using a salting-out extraction system of dipotassium phosphate/ethanol. Mass transfer of 1,3-propanediol takes place from the dispersed phase (salt-rich solution) to the continuous phase (ethanol). The influences of flow rate of dispersed phase and size of packing material on partition coefficient and recovery of 1,3-propanediol were investigated and the results were compared with those obtained in spray column and test tube. Furthermore, the influences of various system compositions on hold up of dispersed phase, mass transfer coefficient, and system stability were also studied in the column packed by stainless steel Dixon 3 x 3 mm. It was found that the packed column showed a good extraction efficiency and stability. Besides, 1,3-propanediol recovery of 90.30% was obtained during a 11 h continuous operation when the real fermentation broth was used. At the same time, 94.4% of phosphate could be recovered when 0.2 volume of anhydrous ethanol was added into the raffinate phase at pH 4.0. (C) 2013 Elsevier Ltd. All rights reserved.