| 摘要 |
Process for purifying 1,12-dodecanedioic acid "DDA" by dissolving the impure DDA in hot aqueous acetic acid in the presence of phosphoric acid and a compound containing peroxidic oxygen (e.g., hydrogen peroxide, peracetic acid); filtering the solution to remove insoluble materials, e.g., iron phosphate; cooling the filtrate to recrystallize the DDA; washing the recrystallized DDA with aqueous acetic acid and then with water; and recovering the washed DDA crystals. This purified DDA is suitable for conversion into polyamide textile fiber.
|
