摘要
采用管式超滤装置，选用切割分子量为20000的聚丙烯腈膜，对乳清进行了超滤浓缩试验。结果表明，降低乳清pH值可提高透液通量，把乳清调整至pH7．0，再离心除去不溶性钙盐，可获得最大透液透量。中性乳清经离心沉降后，在进口压力0.24MPa，温度45℃条件下浓缩180min，平均透液通量达到29．1kg／m2·h,蛋白质含量提高到2.85％，透过液中乳糖浓度变化不大。
Acid whey was concentrated by polyacrylonitrile tubular ultrafiltration membranes with molecular weight cut off of 20 000 daltons.Reducing whey pH value could improve its flux,first adjusting pH value up to 7. 0 and then removing insoluble calcium phosphate by centrifugation would obtain highest flux. Neutral whey centrifuged was concentrated for 180 min at an inlet pressure of 0. 24 MPa and a temperature of 45℃, its average flux was up to 29. kg/m3. h,protein in the retentate was 2. 85 %, lactose in the permeate was 4. 33 %.
出处
《食品与机械》
CSCD
1999年第2期34-35,共2页
Food and Machinery
关键词
超滤
浓缩
乳糖
乳清蛋白
分离
Whey
Concentration
Ultrafiltration
Lactose
