RECOVERY OF CARBOXYLIC ACID FROM THEIR MAGNESIUM SALTS BY PRECIPITATION USING HYDROCHLORIC ACID, USEFUL FOR FERMENTATION BROTH WORK-UP

• Main Authors: DE HAAN, ANDRE BANIER, JANSEN, PETER PAUL, VAN BREUGEL, JAN, VIDAL LANCIS, JOSE MARIA, VAN DER WEIDE, PAULUS LODUVICUS JOHANNES, CERDA BARO, AGUSTiN
• Format: Patent
• Language: English
• Published: 15.12.2020

The invention provides a method for preparing a carboxylic acid, which method comprises the steps of providing magnesium carboxylate, wherein the carboxylic acid corresponding with the carboxylate has a solubility in water at 20 ?C of 80 g/100 g water or less; acidifying the magnesium carboxylate with HCl, thereby obtaining a solution comprising carboxylic acid and magnesium chloride (MgCh); optionally a concentration step, wherein the solution comprising carboxylic acid and MgCb is concentrated; precipitating the carboxylic acid from the solution comprising the carboxylic acid and MgCb, thereby obtaining a carboxylic acid precipitate and a MgClz solution. The inventors found that the addition of HCl to a magnesium salt of the carboxylic acid and subsequent precipitation of the carboxylic acid from the solution leads to a very efficient separation of the carboxylic acid from a magnesium carboxylate solution.