| abstract |
The present invention pertains to a method for preparing a carboxylic acid by acidification of a liquid feed comprising a carboxylate salt, which method comprises the steps of - providing a liquid feed comprising magnesium carboxylate; - providing a gas feed comprising gaseous hydrogen chloride; and - acidifying the carboxylate to carboxylic acid by bringing the liquid feed into contact with the gas feed, thereby forming a liquid effluent comprising carboxylic acid and magnesium chloride, wherein the gas feed comprising gaseous hydrogen chloride is derived from a thermal decomposition step wherein an aqueous liquid comprising magnesium chloride is subjected to a temperature of at least 300 °C, thereby decomposing magnesium chloride into magnesium oxide and hydrogen chloride, thus obtaining a solid comprising magnesium oxide and a gas comprising gaseous hydrogen chloride. |