离心式分子蒸馏设备在发酵L-乳酸精制工艺中的应用  

Application of centrifugal molecular distillation equipment to L-lactic acid refining process

作　　者：孙波[1] 徐宁[2] 姚婉莹[3] 赵传玉 刘思成 

机构地区：[1]东北农业大学食品学院,黑龙江哈尔滨150030 [2]东北农业大学成栋学院,黑龙江哈尔滨150030 [3]美国明尼苏达大学生物质工程系,明尼苏达双城 [4]哈尔滨申宣科技有限公司,黑龙江哈尔滨150036

出　　处：《化工进展》2009年第10期1872-1875,1879,共5页Chemical Industry and Engineering Progress

基　　金：黑龙江省“十五”科技攻关项目(GB06C316)

摘　　要：以发酵液中的乳酸为原料,采用离心式分子蒸馏设备进行精制。研究了离心式分子蒸馏设备的蒸发面温度、蒸发面转速、冷热面间距、冷热面温差对L-乳酸纯度和收率的影响,试验结果表明利用离心式分子蒸馏设备精制发酵L-乳酸的最适工艺条件为:压力0.1Pa,进料温度50～70℃,蒸发面温度60～75℃,蒸发面转速700～900r/min,冷热面间距20～30mm,冷热面温差40～45℃,在此条件下操作L-乳酸的纯度由80%提高到95%,收率为70%。Centrifugal molecular distillation equipment was employed for refining lactic acid. The effects of temperature and rotary speed of evaporating plate, distance from evaporating plate and temperature difference on the purity and yield of L-lactic acid were studied. The results indicated that the optimal conditions to refine L-lactic acid by centrifugal molecular distillation were obtained at the pressure of 0.1Pa, feed-in temperature of 50-70℃, evaporating temperature at 60-75℃, rotary speed of the evaporating plate of 700-900r/min, distance from the evaporating plate of 20-30mm and temperature difference of 40-45℃.The purity of L-lactic acid increased from 80% to 95%, accompanied by the yield of 70% under the optimized conditions.

关 键 词：离心式分子蒸馏设备 L-乳酸 精制 

分 类 号：TQ028[化学工程]