Nanofiltration membrane was adopted for the use of desalting and concentrating the optical brightener to produce a product of consistent quality and decrease the contaminant in the outlet.

• 采用纳滤膜分离技术替代原有的酸析工艺对增白剂合成液进行脱盐和浓缩,以提高产品质量,减少污染物排放。小试实验表明,纳滤膜对增白剂的平均截留率989%25,对盐基本没有截留效果。