摘要
氨基葡萄糖盐酸盐极性大,传统物理萃取方法分离效果不理想,今采用离子交换萃取方法用二(2-乙基己基)磷酸钠萃取氨基葡萄糖盐酸盐溶液。测定了氨基葡萄糖盐酸盐初始浓度、萃取温度、萃取剂初始浓度、以及pH值对分配系数的影响。结果表明,在其他实验条件相同的情况下,分配系数随温度变化不明显,随二(2-乙基己基)磷酸钠初始浓度增加而增大,随氨基葡萄糖盐酸盐初始浓度增加而减少,随pH值增加先增大后减小;氨基葡萄糖盐酸盐低浓度下的分配系数远大于其高浓度下的分配系数;为获得最佳萃取效果,萃取平衡体系要尽量接近中性。建立了分配系数模型,并讨论了四种特殊情况下的分配系数表达式。研究结果为工业用离子交换萃取法分离氨基葡萄糖盐酸盐提供了一定的技术依据。
Since the traditional physical extraction is not a good chose for the separation of glucosamine hydrochloride due to its strong polarity,the ion-exchange extraction of glucosamine hydrochloride by sodium di-（2-ethylhexyl） phosphate （D2EHPNa） was investigated.The effects of temperature,initial concentrations of D2EHPNa and,and pH of the aqueous solution on distribution coefficient were studied.The results show that the distribution coefficient shows no obvious change with the change of temperature,while increases with the increases with the increases of the initial concentration of D2EHPNa,decreases with the increase of glucosamine hydrochloride initial concentration,and increases at first and then decreases with the increase of pH.More over,the distribution coefficient at low glucosamine hydrochloride concentration is much bigger than that at high concentration of glucosamine hydrochloride.It was found that,in order to obtain good extractive effect,the extractive system should be neutral.A mathematical model for distribution coefficient was proposed,and four special cases were discussed.This study is helpful for the extension of using the ion-exchange extraction technique to separate the glucosamine hydrochloride in industrial production.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2010年第4期554-561,共8页
Journal of Chemical Engineering of Chinese Universities
基金
国家科技支撑计划课题(2007BAI34B007)
关键词
二(2-乙基己基)磷酸钠
氨基葡萄糖盐酸盐
分配系数
离子交换萃取
络合萃取
sodium di-（2-ethylhexyl） phosphate
glucosamine hydrochloride
distribution coefficient
ion-exchange extraction
complexation extraction
