| 摘要 |
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° 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 (MgCl2); optionally a concentration step, wherein the solution comprising carboxylic acid and MgCl2 is concentrated; precipitating the carboxylic acid from the solution comprising the carboxylic acid and MgCl2, thereby obtaining a carboxylic acid precipitate and a MgCl2 solution. |
| 主权项 |
1. A method for preparing a carboxylic acid, comprising:
providing an aqueous solution or suspension of 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 hydrogen chloride (HCl), thereby obtaining a solution comprising carboxylic acid and magnesium chloride (MgCl2); and, precipitating the carboxylic acid from the solution comprising the carboxylic acid and MgCl2, thereby obtaining a carboxylic acid precipitate and a MgCl2 solution, wherein the carboxylic acid is selected from the group consisting of adipic acid, itaconic acid, 2,5-furandicarboxylic acid, fumaric acid, oxalic acid, maleic acid, glutaric acid, malonic acid, and fatty acids having more than 10 carbon atoms, the aqueous solution or aqueous suspension comprises at least 10 wt. % magnesium carboxylate, based on the total weight of the solution or suspension, and the solution comprising the carboxylic acid and MgCl2 comprises at least 5 wt. % of magnesium chloride, based on the total weight of the solution. |
