To provide a process for producing oxalic acid capable of producing oxalic acid in a high yield and in a large quantity thereby achieving significant reduction in cost while being excellent in process stability, reliability, initial cost, running cost, etc., by simplified steps and production facilities.
In the production process for oxalic acid, carbon dioxide (CO2) dissolved in an aqueous solution is reduced by nascent hydrogen (H++e-) to produce oxalic acid (HOOC-COOH). That is, the electron (e-) and the proton (H+) of the nascent hydrogen are reductively added to cationized carbon atom (C+) and anionized oxygen atom (O-) produced by polarization of one carbonyl group (C=O) of the carbon dioxide, thereby attaining single bonds between carbon atoms of two moles of carbon dioxide, so that one mole of oxalic acid is synthesized. The carbon dioxide is charged continuously in the aqueous solution so as to be dissolved in a saturated state.
MATSUMOTO YASUO
MURATA TOSHIAKI
TAMAGAWA JUNNOSUKE
