Process for producing thiourea dioxide
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsToshiaki Kanada, Seikyu Jinnouchi, Masafumi Shimpo, Tetsuo Koshitsuka, Akiko Kimura
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Abstract
A process for producing a thiourea dioxide fluid by mixing thiourea and a peroxide, or thiourea, a peroxide and a reaction catalyst, or thiourea, a peroxide, a reaction catalyst and a chelating agent, in the absence or presence of pulp and a process for bleaching pulp by the use of the thiourea dioxide fluid produced by the above process economically advantageously with a small chemicals loss and by small consumption of energy.
Claims6
A process for producing thiourea dioxide, characterized by mixing thiourea, a peroxide and at least one reaction catalyst wherein the reaction catalyst is an oxo-acid of tungsten, molybdenum, vanadium, selenium and titanium or salts thereof, to produce thiourea dioxide with a high yield in the absence of pulp.
Dependencies are inferred from the claim text.