Process for preparing thiourea dioxide
AssigneeTokai Denka Kogyo Kabushiki Kaisha
InventorsOsami Ohura, Osamu Fujimoto
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Abstract
According to this invention there is provided a process for preparing thiourea dioxide characterized in that in the production of thiourea dioxide by the reaction of thiourea and hydrogen peroxide in an aqueous solvent, the filtrate after separation of the crystals of thiourea dioxide after reaction is treated with an ion-exchange resin to remove side reaction products and impurities contained therein and then is used again as a reaction solvent.
Claims7
A process for preparing thiourea dioxide characterized in that in the production of thiourea dioxide by the reaction of thiourea and hydrogen peroxide in an aqueous solvent, the filtrate after separation of the crystals of thiourea dioxide after reaction is treated with both an anion exchange resin and a cation-exchange resin to remove side reaction products and impurities contained therein and then is used again as a reaction solvent in said process.
Dependencies are inferred from the claim text.