分级结晶

实验结果表明，以环己酮为溶剂，混合植物甾醇经过3次分级结晶后，b谷甾醇含量达到87%；以环己酮或正戊醇为溶剂，通过5次重结晶后，豆甾醇含量达到92%。

The experimental results show that the content of b-sitosterol is more than 87 % after the third fractional crystallization in cyclohexanone and the content of stigmasterol is more than 92 % after the fifth crystallization in n-pentanol or cyclohexanone .

自盐湖水提取镁盐之方法，有三类，（1）分级结晶法类，（2）石灰沈降法类，（3）离子交换法类。

2 ) Three kinds of processes for extracting magnisium salt from salt lake water are re-commended ,( a ) the fractional crystallization processes ,( b ) lime precipitation processes , and ( c ) ion exchange processes .

具有分级腿的工业结晶器的近似数学模型及其设计

An Approximate Mathematical Model for Design of Industrial Crystallizers with Elutriators