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.
This application is a continuation-in-part of, and claims the benefit of, U.S. application Ser. No. 11/228,378, filed Sep. 16, 2005, now U.S. Pat. No. 7,244,862, which is incorporated in its entirety as a part hereof for all purposes.
