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研究了玉米芯碱抽提所得木聚糖溶液不同的超滤膜超滤时溶剂透过率与主要操作参数间的关系。研究发现 ,增加操作压力 ,通过PLGC、PLCC两种超滤膜的溶剂透过率随之增加 ,但对PLGC超滤膜而言 ,适宜的操作压力不应超过 80kPa ;进料速度对PLGC超滤膜的溶剂透过率影响较大 ,J∝u0 .63b ,而对PLCC超滤膜的溶剂透过率影响较小 ,J∝u0 .0 9b ;料液浓度与溶剂透过率间关系符合膜模型 ,膜面上溶质浓度与膜截留分子量和操作条件有关。用均匀设计考察操作参数对透过率的影响 ,结果表明 ,对截留分子量大的超滤膜 (PLGC)而言 ,进料速度是控制溶剂透过率的最关键因素 ;而对截留分子量小的超滤膜 (PLCC) ,操作压力是控制溶剂透过率的最关键因素。同时 ,对各操作参数与溶剂透过率间的关系进行了关联 ,各模型预测值与实验值吻合较好 ,相对误差小于 7%
The relationship between the solvent permeability and the main operating parameters during ultrafiltration of different ultrafiltration membranes of xylan solution obtained from corncob caustic extraction was studied. The study found that increasing the operating pressure, solvent permeability through the PLGC, PLCC two ultrafiltration membranes increased, but for PLGC ultrafiltration membrane, the appropriate operating pressure should not exceed 80kPa; feed rate of PLGC ultrafiltration The solvent permeability of the membrane has a greater impact, Jαu0 .63b, while the solvent permeability of PLCC ultrafiltration membrane less affected, Jαu0. 0 9b; feed solution concentration and solvent permeability in line with the membrane Model, the solute concentration on the membrane surface is related to the molecular weight of the membrane and the operating conditions. The uniform design was used to investigate the influence of operating parameters on the transmittance. The results showed that the feed rate was the most critical factor for controlling the solvent permeability for the ultrafiltration membrane with large molecular weight cut-off (PLGC) Ultrafiltration (PLCC), operating pressure is the most critical factor in controlling solvent transmission. At the same time, the relationship between the operating parameters and the solvent permeability was correlated, the predicted value of each model is in good agreement with the experimental value, the relative error is less than 7%