NOVELTY - Separating and purifying the carboxylic acids from fermentation broths containing ammonium carboxylic acid salts, comprises: (a) separating biomass and optionally present solids from fermentation broth, (b) preparing a solution containing desired carboxylic acid and a further solution containing ammonium salts, (c) fine cleaning of the solution containing the desired carboxylic acid from the step (b), (d) concentrating purified carboxylic acid solution from step (c), (e) crystallizing the concentrated carboxylic acid solution from the step (d), (f) concentrating further solution.    USE - The method is useful for separating and purifying the carboxylic acids from fermentation broths containing ammonium carboxylic acid salts (claimed).    ADVANTAGE - The method is simple and energy efficient.    DETAILED DESCRIPTION - Separating and purifying the carboxylic acids from fermentation broths containing ammonium carboxylic acid salts, comprises: (a) separating the biomass and optionally present solids from the fermentation broth, (b) preparing a solution containing the desired carboxylic acid and a further solution containing ammonium salts, by using a simulated moving bed chromatography (SMB), (c) fine cleaning of the solution containing the desired carboxylic acid from the step (b), (d) concentrating the purified carboxylic acid solution from the step (c), (e) crystallizing the concentrated carboxylic acid solution from the step (d), (f) concentrating the further solution containing ammonium salts from the step (b). The reverse osmosis and evaporation is carried out in steps (d) and (f) during the concentration, and the steam from the evaporation from the step (f) is conducted into the evaporation of step (d). An INDEPENDENT CLAIM is also included for apparatus for carrying out the above mentioned method, comprising a filtration device for separation of the biomass and optionally present solids from the fermentation broth, and reverse osmosis devices, and devices for the evaporation.