【摘要】 通过对若干种有机溶剂的比较,选定磷酸三丁酯(TBP)作为萃取剂,甲基异丁基甲酮(M IBK)作为稀释剂,对巯基乙酸(TGA)的萃取进行研究。同时考察了TGA浓度、萃取温度、pH等条件对TGA萃取分配系数的影响。实验结果表明,采用V(M IBK)∶V(TBP)=1∶9的混合萃取剂,控制V(有机相)∶V(水相)=1∶2,在室温下萃取TGA合成液两次,TGA萃取率达98.31%。萃取后有机相中含有无机酸杂质H2SO4和有机酸杂质二硫代二乙酸(DTDGA),可采用w(NaOH)=20%的水溶液洗涤去除。洗涤时控制n(NaOH)/n(DTDGA)=7,洗涤后无机酸杂质H2SO4去除率达100%,有机酸杂质DTDGA去除率达80.3%,TGA损失率2.6%,有机相中m(杂质)/m(TGA)=0.007 3。更多还原

【Abstract】 For extraction of thioglycolic acid(TGA),tributyl phosphate(TBP) was chosen as extractant and methyl isobutyl ketone(MIBK) as diluent by comparision of several organic solvents.Using the mixed extractant(V(MIBK)∶V(TBP)=1∶9),extracting twice under ambient temperature with the volume ratio of organic layer to aqueous layer as 1∶2,the extraction percentage of TGA reached 98.31%.After the extraction,the impurities sulfuric acid and dithiodiglycolic acid(DTDGA) were washed out from the organic layer by w(NaOH)=20% water solution with n(NaOH)/n(DTDGA)=7.After washing,80.3 % of DTDGA and 100% of the sulfuric acid were removed from the organic layer.The loss of TGA was 2.6%,and in the organic layer m(impurities)/m(TGA)=0.007 3.更多还原