Manufacture of oxalic acid dihydrate

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

Reexamination Certificate

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Reexamination Certificate

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07405322

ABSTRACT:
A process for the manufacture of oxalic acid dihydrate in which an aqueous solution of sodium oxalate is contacted with hydrochloric acid and the resulting mixture then cooled to precipitate oxalic acid, followed by optional recovery and recycling of the sodium oxalate and hydrochloric acid into the reaction chamber.

REFERENCES:
patent: 1031074 (1912-07-01), Lidbury
patent: 7244862 (2007-07-01), Zaher et al.

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