Purac Biochem Bv

Agustín Cerdà Baró

Jan Van Breugel

André Banier De Haan

Peter Paul Jansen

Paulus Loduvicus Johannes Van Der Weide

José Maria Vidal Lancis

José María Vidal Lancis

The invention provides a method for preparing a carboxylic acid, which method includes the steps of providing magnesium carboxylate, wherein the carboxylic acid corresponding with the carboxylate has a solubility in water at 20&#xb0; 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 (MgCl); optionally a concentration step, wherein the solution comprising carboxylic acid and MgClis concentrated; precipitating the carboxylic acid from the solution comprising the carboxylic acid and MgCl, thereby obtaining a carboxylic acid precipitate and a MgClsolution.

Acid/salt separation

The invention provides a method for preparing a succinic acid, which method includes the steps of: providing magnesium succinate; acidifying the magnesium succinate with hydrochloric acid (HCl), thereby obtaining a solution including succinic acid and magnesium chloride (MgCl); optionally a concentration step, wherein the solution including succinic acid and MgClis concentrated; precipitating succinic acid from the solution including succinic acid and MgCl, thereby obtaining a succinic acid precipitate and a MgClsolution. The addition of HCl to a magnesium salt of succinic acid and subsequent precipitation of succinic acid from the solution leads to a very efficient separation of succinic acid from a magnesium succinate solution.

A method for preparing a carboxylic acid, includes the steps of: providing magnesium carboxylate, wherein the carboxylic acid corresponding with the carboxylate is selected from the group made of 2,5-furandicarboxylic acid, fumaric acid, adipic acid, itaconic acid, citric acid, glutaric acid, maleic acid, malonic acid, oxalic acid and fatty acids having more than 10 carbon atoms; acidifying the magnesium carboxylate with hydrogen chloride (HCl), thereby obtaining a solution including carboxylic acid and magnesium chloride (MgCl); optionally a concentration step, wherein the solution including carboxylic acid and MgClis concentrated; and precipitating the carboxylic acid from the solution including the carboxylic acid and MgCl, thereby obtaining a carboxylic acid precipitate and a MgClsolution.

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Cerdanyola Valles, Spain

Agustín Cerdà Baró