Lan Keqin, Xu Shuguang, Li Jianmei, Hu Changwei
College of Chemical Engineering, Sichuan University, Chengdu, Sichuan 610065, P. R. China.
Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, P. R. China.
ACS Omega. 2019 Jun 18;4(6):10571-10579. doi: 10.1021/acsomega.9b00794. eCollection 2019 Jun 30.
Lactic acid is an attractive target platform chemical obtained from biorefinery processes based on renewable resources. This study focuses on the recovery of lactic acid from corn stover hemicellulose-derived liquor. Two processes were investigated comparatively. In process I, under the optimized conditions of 10 wt % trioctylamine/octanol, the extraction efficiency and distribution coefficient of lactic acid were 50.8% and 1.03, respectively. In process II, a salting-out extraction step was introduced, which had significant impacts on the following reactive extraction process. The extraction efficiency and distribution coefficient of lactic acid were about 32.2% and 3.85 times higher than that of process I, respectively. All residual sugars and most of the salts (82.8%) could be removed by the salting-out extraction system used. Additionally, five extraction cycles with back-extraction and solvent regeneration were performed, and the results showed that the extraction system still exhibited stable performance. Effective extraction of lactic acid from crude reaction liquor of corn stover was realized by first salting-out and consecutive reactive extraction, which provided a potential method for recovery of lactic acid from actual biomass-derived liquor.
乳酸是一种具有吸引力的目标平台化学品，可通过基于可再生资源的生物炼制过程获得。本研究聚焦于从玉米秸秆半纤维素衍生液中回收乳酸。对两种工艺进行了比较研究。在工艺I中，在10 wt%三辛胺/辛醇的优化条件下，乳酸的萃取效率和分配系数分别为50.8%和1.03。在工艺II中，引入了盐析萃取步骤，这对后续的反应萃取过程产生了显著影响。乳酸的萃取效率和分配系数分别比工艺I高出约32.2%和3.85倍。使用的盐析萃取系统可去除所有残留糖分和大部分盐分（82.8%）。此外，进行了五次带有反萃取和溶剂再生的萃取循环，结果表明萃取系统仍表现出稳定的性能。通过先盐析后连续反应萃取，实现了从玉米秸秆粗反应液中有效萃取乳酸，为从实际生物质衍生液中回收乳酸提供了一种潜在方法。
