共查询到17条相似文献,搜索用时 93 毫秒
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以栾树叶多酚提取物为原料,比较了7种大孔树脂对栾树叶多酚的静态吸附与解吸效果,结果表明AB-8树脂性能最佳,其24h静态吸附量为13.74mg/g,解吸率为98.35%,3h内达到吸附平衡与解吸平衡。AB-8树脂动态吸附较佳条件为上样液质量浓度为4g/L,上样液pH值为6,在此条件下吸附率为88.21%,动态洗脱较佳条件为洗脱剂乙醇体积分数为60%,洗脱速度为1mL/min,解吸率达到89.91%,在该条件下栾树叶总多酚经AB-8树脂纯化后,质量分数由50.36%增加到72.37%,回收率为86.83%。 相似文献
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大孔吸附树脂分离纯化胡芦巴中总皂苷工艺 总被引:3,自引:0,他引:3
通过对11种大孔吸附树脂对比研究,筛选出了一种对胡芦巴中总皂苷具有最佳吸附解吸性能的树脂,并对该树脂的静态和动态吸附性能进行了研究,确定了树脂纯化总皂苷的工艺参数。结果表明,HPD-400A型树脂对总皂苷有良好吸附分离性能,Freundlich等温吸附模型较Langmuir模型更适宜描述树脂对胡芦巴总皂苷的吸附;吸附分离总皂苷的工艺条件:树脂柱径高比为1∶10,上柱液质量浓度为1.358 mg/mL,流速为2 BV/h,解吸流速1 BV/h,解吸液为体积分数60%的乙醇,洗脱剂用量为1.5 BV。经大孔树脂纯化前总固物中总皂苷质量分数为11.38%,纯化后总固物中总皂苷质量分数为42.76%,纯度提高了近4倍。 相似文献
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Hydrolysis of palm oil was studied using four types of commercial H+-exchanged resin with acidity in the region of 5×10−3 eq g−1 but with different pore volumes, specific surface areas, and pore diameters. The reaction was carried out in a stirred batch reactor in the liquid phase with continuous steam injection for up to 14 h. The rate of hydrolysis did not depend on total pore volume and specific surface area but did depend on pore diameter. On exchanging H+ with La3+, Co2+, and Na+, the rate of reaction decreased markedly and was dependent on the degree of exchange, demonstrating that hydrolysis was catalyzed by H+ sites. The activation energy for the hydrolysis of the triglycerides was estimated to be 240 kJ mol−1. A procedure to estimate the rates of the different stages of hydrolysis and hence the individual rate constants of the forward and reverse reactions is described. The procedure yielded reasonable parameters for the reaction at 155°C up to 6 h of reaction time, when about 75 mol% of triglycerides was hydrolyzed. 相似文献