Process for the production of dipotassium-ascorbate-2-sulfate

Details Process for the production of dipotassium-ascorbate-2-sulfate Process for the production of dipotassium-ascorbate-2-sulfate

1990-07-17

1993-08-24

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30762

Patent

active

052390870

ABSTRACT:
The present invention relates to a process for the production of dipotassium-ascorbate-2-sulfate-dihydrate, a vitamin C derivative. It is used, among other things, as an additive to fish feed. In the process according to the process according to the invention, trimethylamine-sulfur-trioxide complex is added in only slight molar excess to a concentrated solution of potassium-L-ascorbate in water, and the pH value of this reaction mixture is set by successive additions of potassium hydroxide at a value in the range between 9.5 and 10.5, and is kept at this value for the duration of the reaction. The process permits the profitable production of dipotassium-ascorbate-2-sulfate-dihydrate on a large industrial scale. It is also explained how trimethylamine-sulfur-trioxide complex can be recovered from trimethylamine which occurs as a by-product during the production of dipotassium-ascorbate-2-sulfate.

REFERENCES:
patent: 3954809 (1976-05-01), Deyoe et al.
patent: 4070377 (1978-01-01), Hayashi et al.
patent: 4071534 (1978-01-01), Hayashi et al.
Journal of the Chemical Society, "Synthesis and Stability of L-ascorpate 2-sulphate", pp. 1220-1224, 1974.
Chemical Abstracts, No. 10, Sep. 5, 1977, vol. 87, p. 338 No. 73386m.

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