EXTRACTION AND SORPTION OF ACETIC-ACID AT PH ABOVE PK(A) TO FORM CALCIUM-MAGNESIUM ACETATE

Different extractants (trioctylphosphine oxide and secondary, tertiary , and quaternary amines) and solid sorbents (tertiary and quaternary a mines) were investigated as agents for recovery of acetic acid as part of a process for production of calcium magnesium acetate (CMA) from f ermentation acetic acid. The pH and temperature dependencies for uptak e of acetic acid by these extractants and sorbents were measured, alon g with the degrees of regeneration by aqueous suspensions of slaked do lomitic lime. These results enable identification of agents having opt imal basicity. Among the extractants, the secondary amine Amberlite LA -2 gave the best combined performance for extraction and regeneration. Among the sorbents, a tertiary amine, Amberlite IRA-35, gave the best performance. Trioctylphosphine oxide does not maintain capacity in th e pH range (about 6) most attractive for acetic acid fermentation. Slu rried crushed dolomite is not sufficiently basic to accomplish regener ation.