中空纤维更新液膜提取柠檬酸的研究+研究.pdfVIP

中空纤维更新液膜提取柠檬酸的研究 ∗ 李皓淑 任钟旗 张卫东 林微 江漪 （北京化工大学化工资源有效利用国家重点实验室，北京100029） 摘要：本文以柠檬酸溶液-30％N235/20％正辛醇/煤油-氢氧化钠溶液为实验体系，在中空纤维更新液膜器中 研究了提取柠檬酸的传质性能，探讨了两相流速、料液浓度对传质性能的影响。结果表明，中空纤维更新液 膜处理柠檬酸溶液在短时间内去除率可达95％，研究结果还表明，在本实验条件下随着管程流速的增加总传 质系数增大；而壳程流速对总传质系数无明显影响；随着料液浓度的增大总传质系数减小；而随着反萃浓度 的增大，总传质系数增大。 关键词：中空纤维更新液膜 柠檬酸 传质系数 Study on the Extraction of Citric Acid by Hollow Fiber Renewal Liquid Membrane LI Hao-shu, REN Zhong-qi, ZHANG Wei-dong, LIN Wei, JIANG Yi (College of chemical Engineering, Beijing University of Chemical Technology, Beijing 100029) Abstract: In this study, experiments were carried out to investigate the mass transfer performance of hollow fiber renewal liquid membrane (HFRLM) when it was applied to extraction of citric acid. The influences of feed phase velocity, strip phase velocity, concentration of feed phase and concentration of strip phase in HFRLM process were studied. Based on the experimental data, the extraction percentage of citric acid can reach 95%. It was proved that the mass transfer coefficient of HFRLM process increased with the increasing of feed phase velocity, but the influence of strip phase velocity was obscure. And the mass transfer coefficient decreased with the increasing of feed phase concentration, reversely, increased with the increasing of strip phase concentration. Keywords: hollow fiber renewal liquid membrane, citric acid, mass transfer coefficient 收稿日期：2006-09-03 基金项目：国家自然科学基金） 作者简介：张卫东，教授，博导，010-6442-3628 ；E-mail: zhangwd@mail.buct.edu.cn 柠檬酸又名枸橼酸，学名 2－羟基丙三羧酸。 柠檬酸的工业生产法主要有两种[1]，一种是以天然含柠檬酸的果实为原料，用榨汁提 取的制备法；另一种是发酵生产法，而该法是目前国内外生产柠檬酸的主要方法。 发酵法所得的发酵液是稀的柠檬酸水溶液。 近年来，对发酵生产柠檬酸的提取，国内外均采用传统的钙盐法[2]。该法尽管能得到 优质的柠檬酸晶体，但是，操作步骤繁多、分离周期长、能耗大、成本高、收率低