Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate
2008-07-29
2008-07-29
Zucker, Paul A (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
Reexamination Certificate
active
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.
Fritzler Bryan C.
Hutchison Scott N.
Zaher Joseph J.
E.I. Du Pont de Nemours and Company
Zucker Paul A
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