木聚糖碱抽提液超滤过程中截留率的研究

RETENTION OF XYLAN EXTRACTIVES DURING ULTRAFILTRATION

研究了木聚糖碱抽提液超滤过程中截留率的变化规律。研究结果表明:GC5、GC10、GC30这3种超滤膜对木聚糖截留率均大于90%,操作压力、进料速度、木聚糖浓度等操作参数几乎不影响它们对木聚糖的截留能力;另外,操作压力、进料速度、木聚糖浓度等操作参数增大时,PS6超滤膜对木聚糖的截留率随之略有增大,在76%～87%之间。上述4种超滤膜对木聚糖碱抽提液中非还原糖类固形物的截留率均小于15%。GC5、GC10、GC30、PS6等4种超滤膜适用于纯化木聚糖碱抽提液,但GC类超滤膜更适合于木聚糖碱抽提液的超滤纯化过程。

The retention of xylan extractives during ultrafiltration was investigated.It was shown that the retention for xylan was more than 90% using GC5,GC10 and GC30 membranes.Operating parameters such as transmembrane pressure,feed concentration and xylan concentration in feed had hardly any effect on the retention for xylan with the membranes mentioned above.The retention for xylan with PS6 membrane was between 76% and 87%,and it (increased) with the increase in transmembrane pressure,feed concentration or xylan concentration in feed.The retention for non-reducing sugars was below 15% in all experiment conditions using these four kinds of membrane.It was (concluded) that these membranes were preferable for the purification of xylan extractives,in which GC membranes were more suitable for the purification process than PS membrane.