选择苯丙氨酸和天冬氨酸水溶液进行了纳滤分离过程研究，讨论了不同pH下氨基酸的透过特性，并就该体系的浓缩分离进行了模拟计算.
The permeation experiments of aqueous solution of amino acids (L-phenylalanine and L-Aspartic acid) were carried out with nanofiltration membranes. The rejections of phenylalanine and aspartic acid are about 0 and 90%, respectively. The results show that the amino acids having large differences of isoelectric points (pI) can be separated satisfactorily by adjusting the value of pH. Then the concentration and separation process of phenylalanine and aspartic acid solution was simulated. A batchwise concentration and diafiltration system was designed. The results show that it is feasible to separate phenylalanine and aspartic acid in viewpoint of technology.
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