以聚哌嗪酰胺为功能分离层材料，通过对制膜液配方及工艺的精准调控，提升膜对进料液中离子的选择透过性(对单价离子低截留，对二价或高价阴离子高截留)和抗污染性。产品适用于溶液分盐、卤水精制，以及化工物料、生物制剂、糖类等分离、精制和浓缩。

BHM Using polypiperazine-amide as the separating layer material, adjusting and control the formula of membrane-making liquid, which improve the membrane selective permeability to ion in feed water(low rejection of monovalent ions, high rejection of bivalent and multivalent ions) and anti-fouling performance.N70 series nanofiltration membrane elements are widely applied in solution desalination, brine refine and separation, concentration and refine of chemical material, biological agents and saccharides etc.