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Thiourea dioxide 90% is an organosulfur compound that is used in the textile industry.
Thiourea dioxide 90% functions as a reducing agent.
Thiourea dioxide 90% is a white solid, and exhibits tautomerism in solution.
CAS: 1758-73-2
MF: CH4N2O2S
MW: 108.12
EINECS: 217-157-8
Synonyms
aminoimino-methanesulfinicaci;HONGDA GROUP LIMITED LLC;Amino(imino);Aminoiminomethanesulfinic acid for synthesis;(4189-44-0) thiourea dioxide;Methanesulfinicacid,aminoimino-;AMIDINOSULFINIC ACID;AMINOIMINOMETHANESULFINIC ACID
;Thiourea dioxide;1758-73-2;amino(imino)methanesulfinic acid;Formamidinesulfinic acid;Formamidine sulfinic acid;Manofast;Aminoiminomethanesulphinic acid;AIMSA;Methanesulfinic acid, 1-amino-1-imino-;AMINOIMINOMETHANESULFINIC ACID;Methanesulfinic acid, aminoimino-;carbamimidoylsulfinic acid;Methenesulfinic acid, aminoimino-;MFCD00002397;NSC 34540;formamidine sulfuric acid;42BWR07L73;DTXSID4029224;NSC-34540;NSC-226979;EINECS 217-157-8;NSC 226979;UNII-42BWR07L73;Formamidinesulfinic acid (Thiourea dioxide);EC 217-157-8;SCHEMBL42684;Urea, thio-, 2,2-dioxide;DTXCID509224;Formamidinesulfinic acid, >=98%;NSC34540;EINECS 224-065-1;Tox21_200647;NSC226979;STK802362;AKOS005622655;CS-W016631;HY-W015915;BRN 1902754;NCGC00248780-01;NCGC00258201-01;AS-12131;CAS-1758-73-2;F0115;NS00019550;EN300-125680;Q7784714
A white or light-yellow odorless crystalline powder. Mp:126°C. Soluble in water (27 g / L at room temperature).
Decomposes exothermically at temperatures above 126°C with the emission of noxious gases (sulfur oxides, ammonia, carbon monoxide, nitrogen oxides and hydrogen sulfide) and carbon dioxide.
Extended exposure to temperatures above 50°C and moisture may cause visible decomposition.
Irritating to skin and mucous membranes.
Corrosive to eye tissue. Used in leather processing, the paper industry, photographic industry, and in textile processing as a bleaching agent.
Thiourea dioxide 90% is an organosulfur compound, which is widely and commonly used in the textile making industry.
Thiourea dioxide 90% is white crystals, soluble in water, aqueous solution and it has both the characteristics of hydrogen peroxide and urea.
Thiourea dioxide 90% plays a role as a reducing agent.
Strictly speaking, Thiourea dioxide 90% is actually not a dioxide, but it is a derivative of a sulfinic acid (RS(O)(OH), That is why Thiourea Dioxide is also called formamidine sulfinic acid.
Thiourea dioxide 90% appears as a white or light-yellow odorless crystalline powder.
Soluble in water (27 g / L at room temperature).
Decomposes exothermically at temperatures above 126 °C with the emission of noxious gases (sulfur oxides, ammonia, carbon monoxide, nitrogen oxides and hydrogen sulfide) and carbon dioxide.
Extended exposure to temperatures above 50 °C and moisture may cause visible decomposition. Irritating to skin and mucous membranes.
Corrosive to eye tissue.
Used in leather processing, the paper industry, photographic industry, and in textile processing as a bleaching agent.
Thiourea dioxide 90% Chemical Properties
Melting point: 124-127 °C (dec.)(lit.)
Boiling point: 355.3±25.0 °C(Predicted)
Density: 1.68
Bulk density: 850kg/m3
Vapor pressure: 0Pa at 25℃
Refractive index: 1.6550 (estimate)
Storage temp.: 2-8°C
Solubility: 27g/l
Form: Crystalline Powder
Pka: 2.40±0.10(Predicted)
Color: White
PH: 4 (10g/l, H2O, 20℃)
Water Solubility: 30 g/L (20 ºC)
Sensitive: Moisture Sensitive
BRN: 506653
InChIKey: FYOWZTWVYZOZSI-UHFFFAOYSA-N
LogP: -3.37 at 25℃
CAS DataBase Reference: 1758-73-2(CAS DataBase Reference)
EPA Substance Registry System: Thiourea dioxide 90% (1758-73-2)
Structure
The structure of Thiourea dioxide 90% depends on its environment.
Crystalline and gaseous thiourea dioxide adopts a structure with C2v symmetry.
Selected bond lengths: S-C = 186, C-N = 130, and S-O = 149 pm.
The sulfur center is pyramidal.
The C-S bond length is more similar to that of a single bond.
For comparison, the C=S bond in thiourea is 171 pm.
The long C-S bond indicates the absence of C=S character.
Instead the bonding is described with a significant contribution from a dipolar resonance structure with multiple bonding between C and N. One consequence of this bonding is the planarity of the nitrogen centers.
In the presence of water or DMSO, Thiourea dioxide 90% converts to the tautomer, a sulfinic acid, (H2N)HN=CS(O)(OH), named formamidine sulfinic acid.
Synthesis
Thiourea dioxide 90% was first prepared in 1910 by the English chemist Edward de Barry Barnett.
Thiourea dioxide 90% is prepared by the oxidation of thiourea with hydrogen peroxide.
(NH2)2CS + 2H2O2 → (NH)(NH2)CSO2H + 2H2O
The mechanism of the oxidation has been examined.
An aqueous solution of Thiourea dioxide 90% has a pH about 6.5 at which thiourea dioxide is hydrolyzed to urea and sulfoxylic acid.
Thiourea dioxide 90% has been found that at pH values of less than 2, thiourea and hydrogen peroxide react to form a disulfide species.
Thiourea dioxide 90% is therefore convenient to keep the pH between 3 and 5 and the temperature below 10 °C.
Thiourea dioxide 90% can also be prepared by oxidation of thiourea with chlorine dioxide.
The quality of the product can be assessed by titration with indigo.
Uses
Convenient reagent for the reduction of ketones to secondary alcohols.
Thiourea dioxide 90% is an effective bleach when used alone or when used after hydrogen peroxide in a full bleaching process.
Bleaching with Thiourea dioxide 90% is not common practice but it is effective when used alone, and the process compares favorably with hydrogen peroxide bleaching.
A formulation can include a commercial Thiourea dioxide 90% product, wetting agent and EDTA sequestering agent.
Reductive bleaching is carried out at pH 7.0 at 70°C for 60 min.
Thiourea dioxide 90% is used in reductive bleaching in textiles.
Thiourea dioxide 90% has also been used for the reduction of aromatic nitroaldehydes and nitroketones to nitroalcohols.
Thiourea dioxide 90% is widely seen used in reductive bleaching in textiles.
Thiourea dioxide 90% has also been used for the reduction of aromatic nitroaldehydes and nitroketones to nitroalcohols.
Thiourea dioxide 90% can also be used as reduction cleaning agent, stripping agent and machine cleaning agent in textile industry.
In paper industry, Thiourea dioxide 90% is used for de-inking and bleaching pulp to replace Sodium Hydrosulfite.
Thiourea dioxide 90% can also be applied for daily chemicals and rubber industries.
As a new type of neutral detergent additives,
Thiourea dioxide 90% can also be used in the bleaching of cotton, wood fiber, artificial silk and wool.
In addition, Thiourea dioxide 90% is commonly used in animal feed additives and medical fungicides, as well as the protective products of oral and dental.
A new environmental-friendly substance which can be used to replace sodium hydrosufite.
Till now, there is no pollution problems reported about thiourea Dioxide or Formamidine sulfinic acid.
Thiourea dioxide 90% has better thermal stability and stronger reducing properties.
(1) Thiourea dioxide 90% is used in reductive bleaching in textiles.
Thiourea dioxide has also been used for the reduction of aromatic nitroaldehydes and nitroketones to nitroalcohols.
(2) Thiourea dioxide 90% is a new environmental-protection agent which can be used in place of sodium hydrosulfite, Thiourea dioxide 90% has better thermal stability and stronger reducing ability.
Operation is simple and effective, and transportation and storage convenient.
There is no pollution associated during the operation.
(3) Thiourea dioxide 90% is a promoter used with textiles and dyes, it is widely used to reduce dyes and sulfur dyes, and for bleaching wool and silk.
Other uses include the reduction cleaning of disperse dyes, stripping undesirable colors from dyes, and in dye vat cleaning.
(4) Thiourea dioxide 90% is also used in the paper industry as a bleaching agent and for deinking waste paper.
(5) Thiourea dioxide 90% may be used as catalyst for producing synthetic resins in the polymer materials industry, and also has applications in organic synthesis of photosensitive materials, pharmaceuticals, spices and other fine chemicals, as well as in precious metal recovery and separation.
Reactivity Profile
Thiourea dioxide 90% is a reducing agent and a derivative of sulfinic acid (a weak inorganic acid).
Decolorizes and bleaches materials by chemical reduction.
Stable under normal temperatures and pressures.
May decompose on exposure to moist air or water.
Incompatible with strong oxidizing agents, strong bases.
Aqueous solutions are acidic and corrosive.
Fire will produce irritating, corrosive and/or toxic gases.
Inhalation of decomposition products may cause severe injury or death.
Contact with substance may cause severe burns to skin and eyes.
Runoff from fire control may cause pollution.
