膜科学与技术

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Process optimization of clean preparation of L-malic acid by bipolar membrane electrodialysis

Authors： CHEN Qingbai , WANG Haoxue, WANG Jianyou，XU Yong, HAN Ting

Units： 1State Key Laboratory of Separation Membranes and Membrane Processes, School of Environmental Science and Engineering, Tiangong University, Tianjin, 300387, China； 2Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China

KeyWords： L-malic acid; bipolar membrane electrodialysis; cleaner production

ClassificationCode：TQ 028.8

year,volume(issue):pagination： 2024,44(4):115-122

Abstract：

The traditional process production of L-malic acid often uses calcium salt method, which requires adding a large amount of inorganic acid to the fermentation broth. The acidification process produces a large amount of waste salt, resulting in additional environmental disposal costs. This article proposes a new process for the preparation of L-malic acid using a two-compartment bipolar membrane electrodialysis (BMED). The conversion rate, current efficiency, and energy consumption are used as evaluation indicators. The influence of process parameters such as current density, initial salt concentration, and membrane surface flow rate on acid production performance was studied, and the operating conditions were optimized and economic analysis was conducted. The results showed that for simulating the fermentation broth of L-malic acid disodium, with a current density of 40 mA/cm2, an initial L-malic acid concentration of 0.2 mol/L, and a membrane flow rate of 1.44 cm/s, the conversion rate of L-malic acid could reach 94.99%, and the energy consumption was 6.77 kWh/kg L-malic acid. Economic analysis showed that the production cost was 11.34 ¥/kg L-malic acid. Research can provide useful references for the development of clean preparation processes for L-malic acid and the promotion of the application of BMED in organic acid production.

Funds：

国家自然科学基金项目（52200102，52373100）；天津市自然科学基金项目（21JCZDJC00270）；国家重点研发计划项目(2017YFC0404003)；南开大学中央高校基本科研业务费专项资金资助（63221312）

AuthorIntro：

陈青柏（1988-），男，河北秦皇岛人，助理研究员，研究方向为分离膜与膜过程。Email：qingbaichen@tiangong.edu.cn

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