摘要
以二（2-乙基己基）磷酸（D2EHPA）-正辛烷萃取L-苯丙氨酸为对象,研究了D2EHPA浓度、L-苯丙氨酸初始浓度以及pH值对萃取平衡分配系数的影响。不同pH值下负载有机相的红外谱图分析表明,D2EHPA与L-苯丙氨酸形成的萃合物结构与pH值无关。提出了在萃取过程中同时存在着离子交换反应和质子转移反应的观点。1个氨基酸分子与2个二（2-乙基己基）磷酸二聚体相结合。本文建立的萃取平衡分配系数关联式,拟合精度令人满意。
A series of extraction equilibrium experiment for L - phenylalanine withdi(2 - ethylhexyl) -phosphoric acid (D2EHPA) dissolved in n - octane was carried out. The effects of L- phenylalanine concentraction,D2EHPA concentraction and pH on extraction distribution ratio were discussed in detail. The infrared spectrogram of loaded organic phase illustrated that pH condition had little effect on the structure of the complex. There are proton - transfer reaction and ion - exchange reaction in the extraction . One L - phenylalanine is extracted by forming a complex with two dimeric D2EHPA molecules. An expression of the equilibrium distribution was proposed.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1999年第3期289-295,共7页
CIESC Journal
基金
国家自然科学基金资助项目(No.29306043)
关键词
质子转移
D2EHPA
离子交换
苯丙氨酸
萃取
proton - transfer reaction, ion - exchange reaction, L - phenylalanine, distribution ratio
