多指标评价有机相中纳滤分离丹酚酸B的适用性

目的探索纳滤技术分离有机相中丹酚酸B的适用性。方法以截留率、传质系数、膜通量、膜耐用性和完整性为指标,综合评价大孔树脂洗脱制备的有机相中纳滤分离丹酚酸B的适用性。结果丹酚酸B截留率随着膜截留相对分子质量增加而下降;随着溶液中乙醇比例增加,膜通量衰减明显且丹酚酸B传质系数下降。通过膜耐用性和完整性评价发现,随着分离时间的增加,NFG纳滤膜的截留性能稳定;在膜污染、添加剂溶解脱落等多种效应下,膜通量出现先下降进而升高并维持稳定的现象,同时膜分离层荷电特征稳定,但有效分离孔径增加。结论 NFG纳滤膜可以满足低浓度乙醇溶液中丹酚酸B的精制分离,具有较好的适用性。以丹酚酸B原料精制为例综合分析有机相中纳滤分离的适用性,为有机相中酚酸类成分的精制富集提供理论和技术支撑。

Multi-index evaluation of applicability of nanofiltration separation of salvianolic acid B in organic phase

Objective To explore the applicability of nanofiltration separation of salvianolic acid B in organic phase. Methods The rejection rate, mass transfer coefficient, membrane flux, membrane durability and membrane integrity were selected as indexes to evaluate the applicability of nanofiltration for the separation of salvianolic acid B raw material in organic phase from the eluate of macroporous resin. Results The experiment showed that there was a negative relationship between rejection rate and membrane molecular weight cut-off. Meanwhile, the mass transfer coefficient of salvianolic acid B was decreased and the membrane flux was obviously decayed with the increase of ethanol concentration. Through the membrane durability and integrity evaluation, the rejection performance of NFG nanofiltration membrane was stable with the increasing of separation time. Also, the membrane flux decreased first and then increased and maintained stable. At the same time, the charge characteristic of the membrane separation layer was stable, but the effective separation aperture was increased by the combined effects of membrane fouling, additives shedding and so on. Conclusion Based on the comprehensive analysis, NFG nanofiltration membrane could meet the requirements of the separation of low concentration ethanol solution, and had good applicability. The applicability of nanofiltration separation in organic phase was analyzed comprehensively with salvianolic acid B as example, providing theoretical and technical support for nanofiltration separation of phenolic acids in organic phase.