Process for the preparation of lactic acid by evaporative crystallisation

摘要

The invention relates to a process for the preparation of high purity lactic acid from an aqueous solution containing said acid in the form of salt(s), characterised in that the aqueous solution is treated with a strong acid in order to liberate lactic acid in the free form and to produce salts of the corresponding strong acid, said salts of the strong acid are crystallised by evaporative crystallisation and lactic acid is recovered in the free form in solution.