摘要
传统催化氧化法生产葡萄糖酸技术中的酸化过程耗煤耗电,存在三废污染;而采用双极膜法从催化氧化法葡萄糖酸钠料液制备葡萄糖酸,可在生产成本、环境保护、产品质量等方面改善现有的葡萄糖酸生产工艺.实验以产品纯度和成本为评价标准,对双极膜电渗析的组合形式(二隔室,三隔室)和单极膜材料(进口阳膜,国产阴膜Ⅱ,国产阴膜Ⅰ,国产阳膜Ⅰ)进行筛选,获得以下最佳试验成果:采用BP-C-A三隔室电渗析(国产阴膜Ⅰ+双膜合一国产阳膜Ⅰ、10单元)预设10 A进行恒流操作,葡萄糖酸钠转化率达98.6%;电流效率为71.5%,能耗为1.03 kWh/kg酸,成本为2.81元/kg酸.相关技术将填补国内双极膜法规模化生产有机酸的空白.
Catalytic oxidation is the traditional method for gluconic acid production, but the acidifying procedure has such disadvantages as large consumption of coal and electricity and serious pollutions. Bipolar membrane electrodialysis （BMED） was applied in this work to convert sodium gluconate feed to gluconic acid, and this technique can improve the traditional process especially in the aspects of process cost, environmental benignity and product quality. According to the standards of product purity and process cost, a 3-compartment BMED with 10 repeating units was considered best for the acid production. In particular, the conversion rate of sodium gluconate could was as high as 98.6%, current efficiency 71.5%, energy consumption 1.03 kWh/kg of acid, and process cost 2.81 ￥/kg of acid. This technique will fill a gap existing in large scale applications of BMED to organic acid production in China.
基金
江西新黄海医药食品化工有限公司横向课题
国家自然科学基金(20636050)资助
关键词
双极膜
电渗析
葡萄糖酸
离子交换
催化氧化
bipolar membrane
electrodialysis
gluconic acid
ion-exchange
catalytic oxidation
