生物法制备的丁二酸发酵液中含有残留的底物(葡萄糖)、甲酸、乙酸及二价无机离子(Mg2+、SO42-)等杂质,不利于分离纯化.采用截留相对分子质量为160的纳滤膜LNG-NF-016对丁二酸模拟发酵液进行分离,考察了pH、操作压力、MgSO4浓度、丁二酸浓度、葡萄糖浓度、料液体积流量、操作温度等因素对纳滤分离性能的影响.纳滤分离的选择性由丁二酸的解离状态决定:模拟发酵液调节至pH3.0,丁二酸未解离,可将其与葡萄糖、MgSO4分离,丁二酸的透过率达98％,葡萄糖、MgSO4的截留率均＞85％.随后将透过液调节至pH 6.0,丁二酸形成二价阴离子,可将其与单价的甲酸盐、乙酸盐分离,丁二酸截留率达90％,丁二酸被浓缩至121 g/L,而膜截留液中的甲酸、乙酸浓度均＜5 g/L.同一型号纳滤膜可实现模拟发酵液中丁二酸与副产一元有机酸、底物及多价无机离子的选择性分离.
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