The invention provides a process for the recovery of lactic acid from
aqueous solutions containing at least one water-soluble lactate salt and
having a pH of about between 4 and 14, comprising the steps of:
contacting said aqueous solution with a cation exchanger which is at
least partially in its acid form, said cation exchanger being water
immiscible in both acid and salt form, whereby ion exchange is effected,
protons are transferred from the cation exchanger to the aqueous solution
to acidulate it and to form lactic acid therein and cations from the
aqueous solution are bound by the cation exchanger; reacting the cations
carrying cation exchanger to convert it into a cation exchanger which is
at least partially in its acid form and to a second product, which second
product is basic and comprises the cation of the salt; and recovering
lactic acid from the lactic acid-containing acidulated aqueous solution
by methods known per se.