Product Name: Thiourea Dioxide

Synonyms: Formamidine sulfinic acid, FAS, TDO, TUD

CAS No.: 1758-73-2

Molecular Formula: CH4N2SO2

Molecular Weight: 108.12

Description:

Thiourea dioxide is a stable powder, soluble in water, and decomposes gradually to produce sulfoxylic acid to exhibit a reducing action by heating or in the preence of an alkali, however, the reaction is slow, especially among the pH value of acidic to weak alkaline.

TDO bleaching has recently come to be spotlighted as a substitute for NaClO bleaching in

bleaching of waste wood-free or mechanical paper and as a substitute for Sodium Hydrosulfite bleaching in post-bleaching after hydrogen peroxide deinking/bleaching of waste newspaper, from the viewpoint of the problem of waste water pollution by organic chlorine compounds represented by dioxins, demand for energy conservation, decoloring effect on dye type coloring materials, etc.

TDO bleaching has a considerable decoloring effect on dye type coloring materials, like

Sodium Hydrosulfite bleaching, and TDO has a property of reacting with oxygen in air slowly as compared with Sodium Hydrosulfite. Even when a presently used NaClO bleaching equipment is diverted as it is, a loss due to oxidative decomposition is relatively small and a bleach brightness equal to that attained by NaClO bleaching can be attained by choosing a suitable using amount of TDO.

TDO undergoes relatively rarely oxidative decomposition by oxygen in air. TDO bleaching is suitable for bleaching pulp having a high consistency by an usual equipment while achieving a saving in energy. TDO has been very effective on a wide variety of pulp sources as a reductive bleaching aid in the pulp and paper industry. The application of TDO is crucial to achieve optimal brightness gain in the deinking process.

Technical Data:

Applications:

Thiourea dioxide (TDO) is a strong reductant which re-arranges under alkaline conditions to form formamidine sulphinic acid. This product is used in leather processing industry, paper, pulp and board industry, photographic industry, textile processing industry, bleaching and reducing agents. This product is also a component of decolorisation agents.

Packing: 25kg craft bag lined with plastic bags, or 500kg jumbo bag

Storage: Store in a cool, dry, and well ventilated area, keep away from all source of ignition, direct sunlight and incompatible materials. Keep containers tightly closed. Do not store in unlabeled or mislabeled containers.

Thiourea Dioxide