采用超滤膜技术对染料酸性红的提纯过程进行了研究。分别考察了操作压力、料液流量及料液浓度对超滤膜分离行为的影响。实验过程选用了截留分子量分别为5000和10000的两种超滤膜，结果表明，在0.15～0.4MPa的操作压力范围内，随着操作压力的增加，两种超滤膜的透过液通量增大，对杂质截留率增大，而对染料的截留能力略有下降；在10～30m3/s的料液流量范围内，随着料液流量的增大，截留分子量5000的超滤膜透过液通量增大，杂质截留率增大，对染料的截留能力则变化不大，而截留分子量为10000的超滤膜的透过液通量、杂质截留率和染料截留能力均与料液流量关系不大；在0.5～4%的料液浓度范围内，随着料液浓度的增大，两种超滤膜的透过液通量、杂质截留率和染料截留率均下降。研究认为，对截留分子量10000的超滤膜，膜孔堵塞是膜性能的主要因素因素，而对截留分子量5000的超滤膜，膜面产生的凝胶层则是其性能的主要影响因素

A soluble dye Acid Red was purified by a UF process. The effects of operating pressure, flux of feed solution and feed concentration on the separation process of UF membranes were studied in detail. Two kinds of UF membranes with molecular weight cut-off value 5000 and 10000 respectively were selected in the experiments, and the results showed that the permeation flux and impurities rejection of two UF membranes increased with the increase of operating pressure in the range of 0.15 MPa to 0.4 MPa, while the dye rejection of two UF membranes decreased slightly at the same time. The permeation flux and impurities rejection of UF membrane MWCO 5000 increased with the increase of feed flux in the range of 10 m3/s to 30 m3/s, while the dye rejection of UF membrane MWCO 5000, the permeation flux, impurities and dye rejection of UF membrane MWCO 10000 were unchangeable. The permeation flux, impurities and dye rejection of two UF membranes decreased with the increase of feed concentration in the range of 0.5% to 4%. In addition, the pore-clogging was the main factor of UF membrane MWCO 5000 on its performance, while the gel layer formation of the membrane surface was the main factors affecting performance of UF membrane MWCO 10000.

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