应用膜技术精制荧光增白剂水溶液的工艺设计

Purification of Fluorescent Brightener Aqueous Solution by Nanofiltration

本文对采用卷式纳滤膜作荧光增白剂水溶液的脱盐和浓缩的各种工艺过程进行了预测和比较。将含有1.0mol/L NaCI的0.14mol/L荧光增白剂水溶液浓缩到0.30mol/L再进行连续恒容脱盐,将NaCI浓度降低到0.102mol/L,然后将荧光增白剂水溶液和NaCI的浓度调节到0.25mol/L和0.085mol/L的目标浓度,这种方法所需的膜面积和排放水量都较小。工业运行试验表明该工艺与预测结果吻合良好。

Several technological processes for desalination and concentration of Fluorescent Brightener aqueous solutions with spiral wound nanofiltration membrane modules were predicted and compared.A procedure was recommended that the 0.14mol/L Fluorescent Brightener solution containing 1.0mol/L NaCl component be concentrated up to 0.30mol/ L,then desalinated continuously at the constant-volume condition,till NaCl component decreased down toO. 102mol/L,and the Fluorescence Brightener and NaCl concentrations be adjusted to the objective values of 0.25mol/L and 0.085mol/L in the end.The above procedure needed less membrane modules and gave out less effluent.A test on the production line showed a good agreement with the prediction.