期刊论文

中文

食品工业科技

1002-0306

2009

8

88-90,93

(104-0071):中南林业科技大学***科研基金

本校为第一机构

采用陶瓷膜时柚皮果胶提取液进行超滤浓缩,考察并分析了膜通量与跨膜压力的关系,建立了描述柚皮果胶提取液超滤过程膜污染的凝胶_衰减模型:当跨膜压力△P＜最佳跨膜压力△P_(opt)时,超滤行为遵循凝胶极化模型,通量随跨膜压力的增加而上升,当达到稳定态时有J=Kln(c_G/c_B),此时凝胶层中溶质果胶的浓度c_G为20.53mg·mL~(-1);当△P≥△P_(opt)时,超滤行为遵循衰减模型,其衰减方程为:J=5.464×10~(10)(△P)~(-3.026),膜通量按指数形式衰减.该模型较合理地解释了膜通量与跨膜压力之间呈现钟形关系的原因,有助于指导柚皮果胶提取液的超滤工艺.

Shaddock-peel pectin extracts were concentrated by ceramic membrane ultrafiltration.The relations among fluxes and transmembrane pressures were investigated and analyzed.A gel-attenuation model was set up to describe membrane pollution behavior during the ultrafiltration processes of shaddock peel pectin extracts.When transmembrane pressure △P is less than the optimal transmembrane pressure △Popt, the ultrafiltration of pectin extracts follows gel-polarization model, flux J increases with the transmemberane pressure and the equation J = Kln（...