Reactive extraction using long-chain aliphatic
amines has been studied as an effective and economical
separation process of carboxylic acids.
There are two stages in extractive separation. The
first is the extraction of the acid to produce an acidamine
complex and a relatively acid-free aqueous
raffinate. The second step is necessary for stripping
lactic acid from the organic complex to obtain
amine-free aqueous lactic acid as a product and also
for simultaneously regenerating the extractant, which
is recycled back to the extraction unit.