Nicol, Michael J. published the artcileExtraction of Gold from Chloride Solutions Using Dibasic Esters: A Structure-Reactivity Study, Quality Control of 123-29-5, the main research area is gold extraction chloride solution dibasic ester structure reactivity study.
In a systematic study of the extraction of gold(III) in acidic chloride solutions by a number of aliphatic esters with the focus on dibasic esters, it was found that di- or tribasic esters are more effective extractants than monobasic esters. The equilibrium for the extraction of gold(III) by a series of dibasic esters C2H5OCO(CH2)nCOOC2H5 (n = 0 to 8) has been studied. Diethyladipate (n = 4) was found to be the most reactive. The extraction of gold by di-Et adipate increases with increasing proton and with increasing chloride ion concentrations The latter is due to the effect of chloride ions on the activity coefficient of the proton in concentrated HCl solutions Gold is extracted more effectively by the use of diluents with a high dielec. constant Gold is extracted as the tetrachloro-complex ion. Slope anal. has shown that the extracted gold complex contains three mols. of the ester and one hydrated proton. The Donor number obtained by calorimetric measurements increases with increasing number of methylene groups and is constant for greater than 3 methylene groups. The distribution coefficient correlates with the Donor number up to 4 methylene groups with steric effects resulting in a decrease in extraction for the higher chain length esters. It is proposed that gold is extracted as an ion-pair in the organic phase with a hydrated proton solvated by the esters.
Solvent Extraction and Ion Exchange published new progress about Extraction Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), PROC (Process). 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Quality Control of 123-29-5.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics