苹果酸杂质存在条件下的乳酸锌结晶提纯

Purification of zinc lactate by crystallization in presence of malic acid

研究了苹果酸杂质存在条件下溶液结晶过程参数对乳酸锌晶体产品收率、纯度、晶体结构和形态的影响。结果表明,溶液结晶过程参数对乳酸锌晶体结构和形态没有明显影响,但与纯乳酸锌晶体相比,苹果酸的引入增加了乳酸锌晶体的长径比。晶体纯度的下降与产品收率的上升为近似线性关系,但如结晶过程中发生大量二次成核,晶体产品的纯度将显著下降。

Crystallization of zinc lactate in the presence of malic acid as an impurity was investigated,and the effects of operating variables on the final solid product yield,purity,crystal structure and habit were studied.The results showed that the structure and habit of the impure crystals were hardly changed under different operating conditions,while their length-diameter ratios increased comparing with the pure zinc lactate crystals.Moreover,the solid purity decreased linearly with the increasing yield.However,the purity decreased significantly when substantial secondary nucleation occurred in crystallization.