高浓度钠盐体系中丁二酸溶解度的测定和关联Measurement and Correlation of Solubilities of Succinic acid in High Sodium Salt Solution
吴昊,洪怡,胡俊铎,任晓乾,姜岷,杨柳青,韦萍
摘要(Abstract)：
丁二酸在发酵液中是以解离状态存在,在酸化结晶过程中形成高浓度的无机盐,会对丁二酸的溶解度产生作用,进而影响丁二酸的结晶收率。研究考察了高浓度钠盐体系中pH与温度对丁二酸溶解度的影响,结果表明:由于氯化钠争夺自由水分子,丁二酸的饱和溶解度随氯化钠浓度的增加而显著降低。在此基础上,分别测定了丁二酸在不同pH下的饱和溶解度,在277.2~333.2 K,丁二酸的饱和溶解度均随体系pH的降低而迅速下降,表明丁二酸解离状态及氯化钠的积累对丁二酸溶解度具有显著影响。同时采用Yaws模型对实验数据进行了关联,以温度和pH为变量,获得了相应的溶解度方程,其平均相对误差均小于3.0%,表明Yaws模型拟合得到的溶解度方程与实验值具有很好的相关性,可用于计算高浓度钠盐体系中丁二酸的溶解度数据。
关键词(KeyWords)： 丁二酸;高浓度钠盐;溶解度;pH;温度
基金项目(Foundation): “973”计划资助项目(2009CB24701);; “863”计划资助项目(2011AA02203);; 江苏省高校自然科学基础研究资助项目(08KJB80003);; 南京工业大学青年教师学术基金;; 江苏省“六大人才高峰”资助项目(06A-047)
作者(Author): 吴昊,洪怡,胡俊铎,任晓乾,姜岷,杨柳青,韦萍
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