关键词: 超滤 醇析 分离 纯化 黄原胶

Abstract: The effect of three different pretreatment methods on xanthan gum yield and quality was examined and the dilute multiple and diatomite loading in diatomite—filtration pretreatment were optimized. The effect of membrane, velocity on the membrane surface, temperature, pressure and gum concentration on the water permeation flux in the ultra—filtration was investigated and the best ultra—filtration conditions were determined. The effect of solvents, loading of solvent and pH on alcohol—precipitation of xathan gum was studied and the optimal alcohol—precipitation conditions were obtained.

Key words: ultra—filtration, alcohol—precipitation, xanthan gum, separation, purification