摘要
针对乳酸传统生产工艺废水排放多、产品质量较差的问题,提出两室型双极膜电渗析生产工艺,探索适合工业生产的操作条件。研究结果表明:电流密度对电渗析过程影响最大,提高初始浓度和增加极室盐溶液浓度均能使能耗降低。对1.24 mol/L的乳酸钠溶液,控制电流密度为500 A/m2,流量为80 L/h,极室盐质量浓度为50 g/L时,乳酸收率93%,浓度1.42 mol/L,电流效率72.5%,能耗1.05 kW.h/kg。
A clean technology of bipolar membrane electrodialysis with two compartment configuration was used to produce lactic acid and the suitable operating conditions were investigated.Results showed that current density had the greatest influence on the electrodialysis.The energy consumption decreased with the increasing of initial concentration of sodium lactate and Na2SO4 in electrode compartment.When the sodium lactate solution with the initial concentration of 1.24 mol/L was treated with bipolar membrane electrodialysis under the conditions of current density of 500 A/m2,flow rate of 80 L/h and Na2SO4 concentration of 50 g/L,lactic acid yield was 93%,concentration of lactic acid 1.42 mol/L,current efficiency 72.5% and energy consumption 1.05 kW·h/kg.
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2012年第5期65-69,共5页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国家自然科学基金资助项目(20806039)
国家高技术研究发展计划(863计划)资助项目(2007AA03Z437
2009AA033005)
材料化学工程国家重点实验室资助课题(ZK201005)
江苏省高校自然科学研究资助项目(11KJB530005)
关键词
乳酸
电渗析
双极膜
电流效率
lactic acid
electrodialysis
bipolar membrane
current efficiency
