The use of basic polymer sorbents for the recovery of acetic acid from dilute aqueous solution

Abstract

Measurements were made of preferential uptakes of acetic acid from aqueous solution onto basic polymer sorbents.Individual uptakes of water and acetic acid were measured as well.The sorption equilibria were interpreted through a chemical complexation model yielding sorption affinities and capacities for acetic acid.Basicity scales, such as pKa and Gutmann Donor Number (ON) based upon the monomeric functional group chemistry, were shown to explain the trends in sorption affmities.The use of different solvents to leach sorbed acetic acid from basic polymer sorbents was investigated as a means of regenerating the sorbents.It was found that regeneration can be improved by using solvents of high donicity.Aqueous ammonia proved to be effective for regenerating moderately strong base sorbents. 2-1Comparison of DN With pKa for Various Solvents ............