利用定标粒子理论计算了 11 种无机盐和 3 种有机溶剂在 10% 2，3-丁二醇模拟 发酵液中的标准摩尔溶剂化自由能，结合 37 ℃下的萃取实验，分别得出 11 种盐和 3 种溶 剂萃取分离效果的优劣顺序，为盐析剂和萃取剂的选择提供了理论指导． 结果表明，在组 成标准摩尔溶剂化自由能的几部分中，盐与溶剂分子间的静电相互作用能起着主导作用， 静电作用能绝对值越大，盐对 2，3-丁二醇的萃取提纯效果越好． 随着盐标准摩尔溶剂化自 由能绝对值的增大，有机相中 2，3-丁二醇的质量分数线性增大，水的质量分数线性减小．

In order to provide a theoretical guidance for the selection of salting-out agents and extraction agents， the ionic salvation free energies of eleven kinds of salts and three kinds of solvents in 10% 2，3-butanediol model fermentation solutions were calculated based on the scaled particle theory，with the corresponding extraction effects being ranked according to the experimental extraction results obtained at 37 ℃ ． It is found that，in the several parts consisting of the standard molar solvation free energy，the electrostatic free energy between the salt and the solvent，whose larger absolute value means better salt extraction effect，is the key factor affecting the extraction; and that，with the increase of absolute value of the standard molar solvation free energy，the mass fraction of 2，3- butanediol increases linearly，while that of water decreases linearly