Process for purifying 1,12-dodecanedioic acid

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof

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C07C 5142

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active

041490134

ABSTRACT:
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.

REFERENCES:
patent: 2847467 (1958-08-01), Steadman et al.
patent: 3417138 (1968-12-01), Amir et al.
patent: 3714244 (1973-01-01), Okada et al.
patent: 3903152 (1975-09-01), Matsubara et al.

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