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以盐酸小檗碱为模型分子,考察循环时间、操作压力、料液浓度和离子强度等因素对聚酰胺纳滤膜截留盐酸小檗碱性能的影响。实验表明:聚酰胺纳滤膜对盐酸小檗碱的截留率80min后基本稳定;随着操作压力的增加,膜通量和截留率都增大;随着料液浓度的增加,聚酰胺纳滤膜通量下降,对盐酸小檗碱的截留率先增大后下降;随着溶液中离子强度的增加,膜通量和截留率都减小。在黄连提取液中生物碱含量为0.025g/L、操作压力为0.4MPa条件下,聚酰胺纳滤膜5min可使黄连提取液中生物碱浓缩6.27倍。
Taking berberine hydrochloride as a model molecule, effects of cycle time, operating pressure, feed concentration and ionic strength on the interception of berberine hydrochloride by polyamide nanofiltration membrane were investigated. The experimental results show that the retention rate of berberine hydrochloride in polyamide nanofiltration membrane is basically stable after 80 minutes. With the increase of operating pressure, membrane flux and retention rate increase. With the increase of feed concentration, Membrane flux decreased, the retention of berberine hydrochloride first increased and then decreased; with the increase of ionic strength in solution, membrane flux and retention rate decreased. In the extract of Coptis alkaloid content of 0.025g / L, the operating pressure of 0.4MPa conditions, polyamide nanofiltration 5min concentration of alkaloids in Coptis extract concentrated 6.27 times.