中文摘要：

为提高乳酸产品收率和纯度，实验筛选得到国产315型阴离子交换树脂，用于分离提取发酵液中乳酸，并研究其对乳酸、乙酸、丙酮酸及柠檬酸的吸附等温线、吸附动力学和动态吸附及洗脱效果．吸附等温线结果表明，315型树脂对乳酸等有机酸的吸附等温线符合Freundlich方程，特征参数n〉1，属于优惠吸附．吸附动力学研究表明，液膜扩散是吸附过程的主要控制步骤，符合Boyd液膜扩散模型．动态吸附及洗脱实验结果表明，以1．5BV／h、pH1．88上柱吸附，再用1BV／h的去离子水洗脱，可实现发酵液中乳酸的良好分离．

英文摘要：

The domestic anion exchange resin 315 was selected to separate lactic acid from the fermentation broth. Adsorption isotherm, kinetics, effect of dynamic adsorption and elution on lactic acid, acetic acid, pyruvic acid and citric acid were studied. Adsorption isotherm results showed that the Freundlich isotherm e- quation agreed well with the adsorption data of organic acids on anion exchange resin 315, and the characteris- tic parameter of this equation n 〉 1. It displayed that the adsorption process belonged to favorable adsorption. Besides, the adsorption kinetics of organic acids on anion exchange resin 315 was mainly controlled by liquid film diffusion, and it accorded well with the Boyd liquid film diffusion model. The optimum dynamic adsorp- tion and elution conditions were determined： adsorption flow-rate, 1.5 BV/h; pH 1.88 ; eluent, deionized water; elution flow-rate, 1 BV/h. Under these conditions, the lactic could be well separated from the fermen- tation broth to achieve the purpose of increasing the yield of lactic acid products and improving product＇ purity.