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The Extraction of Thioglyoclic Acid Solution

Hai-Sheng Xu

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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.

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What this paper is about

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.

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Available 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.

Key concepts: Chemistry, Sulfuric acid, Extraction (chemistry), Methyl isobutyl ketone, Tributyl phosphate, Thioglycolic acid, Aqueous solution, Diluent

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