摘要
在本文 (Ⅰ )报关于三辛胺 (TOA)萃取甲酸、乙酸、丙酸、丁酸、戊酸、一氯乙酸、二氯乙酸、三氯乙酸、乙醇酸、乙醛酸、乳酸等 11种羧酸萃取平衡特性的研究基础上 ,采用质量作用定律分析方法建立了TOA对一元羧酸的萃取平衡模型 ,拟合了模型参数———表观反应萃取平衡常数K11,并获得了满意的拟合精度 ;提出了影响TOA萃取一元羧酸平衡的 3个因素 :溶质的亲油性lgP、溶质的酸性pKa、TOA的表观碱度pK′a ,B,并确定了K11与这 3参数的关系 ,经拟合实验测定的 114个K11,获得了一元羧酸K11的关联式 .为一元羧酸分离工艺中萃取剂的选择提供了指导 .
Based on the extraction equilibrium behavior of formic, acetic, propionic, butyric, valeric, monochloroacetic, dichloroacetic, trichloroacetic, glycolic, glyoxylic and lactic acid in part (Ⅰ) of this paper, mathematical models describing extraction behavior of monocarboxylic acid with trioctylamine (TOA) was set up by using the mass action law, and the apparent extraction equilibrium constants, K 11 , K 21 、K 31 and K 12 were obtained. The calculated TOA loading approached the experimental data. The extraction equilibrium behavior depended on the three physical properties of carboxylic acid or extractant, i.e. acid hydrophobicity, acid acidity and the specific basicity of TOA. The correlation of K 11 with these three properties was obtained, and can be used to predict the K 11 of acids.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2004年第1期59-64,共6页
CIESC Journal
基金
国家自然科学基金资助项目 (No 2 983 613 0 )~~
关键词
三辛胺
一元羧酸
亲油性
PKA
表观碱度
表观萃取平衡常数
TOA, mono carboxylic acid, hydrophobicity, pK a, specific basicity, apparent extraction equilibrium constant
