Formamidine sulfinic acid
Formamidinesulfinic acid
CAS: 1758-73-2;4189-44-0
Molecular Formula: CH4N2O2S
Formamidine sulfinic acid - Names and Identifiers
| Name | Formamidinesulfinic acid |
| Synonyms | Amino(imino) Thiurea Dioxide Thiourea dioxide AMIDINOSULFINIC ACID Thiourea S,S-dioxide Formamidinesulfinic acid HONGDA GROUP LIMITED LLC Formamidine sulfinic acid Formamidinesulphinic acid aminoimino-methanesulfinicaci AMINOIMINOMETHANESULFINIC ACID Aminoiminomethanesulphinic acid Methanesulfinicacid,aminoimino- (E)-amino(imino)methanesulfinate (E)-amino(imino)methanesulfinic acid Aminoiminomethanesulfinic acid for synthesis 1-(dioxido-lambda~6~-sulfanylidene)methanediamine |
| CAS | 1758-73-2 4189-44-0 |
| EINECS | 217-157-8 |
| InChI | InChI=1/CH4N2O2S/c2-1(3-4)6-5/h2-3H2 |
| InChIKey | FYOWZTWVYZOZSI-UHFFFAOYSA-N |
Formamidine sulfinic acid - Physico-chemical Properties
| Molecular Formula | CH4N2O2S |
| Molar Mass | 108.12 |
| Density | 1.68 |
| Melting Point | 124-127°C (dec.)(lit.) |
| Boling Point | 355.3±25.0 °C(Predicted) |
| Water Solubility | 30 g/L (20 ºC) |
| Solubility | Thiourea dioxide is sensitive to humidity. Decompose immediately in boiling water. In a slightly alkaline solution, it is decomposed into urea and sulfonic acid. Easily soluble in water, slightly acidic in aqueous solution, soluble in concentrated sulfuric acid, slightly soluble in glacial acetic acid, insoluble in organic solvents such as ether and benzene. Heat to 142-143 ℃ for decomposition. It's irritating. Solubility in water |
| Vapor Presure | 0Pa at 25℃ |
| Appearance | white crystals |
| Color | White |
| BRN | 506653 |
| pKa | 2.40±0.10(Predicted) |
| PH | 4 (10g/l, H2O, 20℃) |
| Storage Condition | 2-8°C；贮存于阴凉、干燥处，避免日晒、雨淋；有效贮存期12个月。 |
| Sensitive | Moisture Sensitive |
| Refractive Index | 1.6550 (estimate) |
| MDL | MFCD00002397 |
| Physical and Chemical Properties | Properties of white odorless crystal powder, is a kind of neither oxidation nor reduction of stable compounds. melting point 126 °c solubility the solubility in 1L water is 26.7g. |
| Use | Widely used in chemical industry, textile industry, as a strong reducing agent, increasingly replacing the insurance powder in the field of printing and dyeing occupies a significant position |
| Caution | Acute toxicity, rat abdominal LD50 423mg/kg; Harmful if swallowed. Irritating to the eyes, respiratory system, and skin. Wear protective clothing, goggles, and rubber gloves during work. Production eq |
Formamidine sulfinic acid - Risk and Safety
| Risk Codes | R5 - Heating may cause an explosion R22 - Harmful if swallowed R36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S24/25 - Avoid contact with skin and eyes. S36 - Wear suitable protective clothing. |
| UN IDs | UN 3341 4.2/PG 2 |
| WGK Germany | 1 |
| RTECS | PB0372500 |
| TSCA | Yes |
| HS Code | 29309070 |
| Hazard Class | 4.2 |
| Packing Group | II |
Formamidine sulfinic acid - Upstream Downstream Industry
| Raw Materials | Hydrogen peroxide Hydrogen peroxide Thiourea Thiourea Ammonium Bicarbonate Ammonium Bicarbonate |
Formamidine sulfinic acid - Nature
Open Data Verified Data
is a white odorless crystalline powder, which is a stable compound having neither oxidative nor reductive properties. The melting point is about 126 ° C., but when heated to above 100 ° C., it is slowly decomposed, and S02 is generated at 110 ° C., and when heating is continued, it is decomposed into urea and sulfurous acid. 20 ℃, in 1L water solubility of 26. 7G, under the action of alkali, can be decomposed into urea and sodium sulfite.
Last Update：2025-06-10 22:55:16
Formamidine sulfinic acid - Preparation Method
Open Data Verified Data
with thiourea and hydrogen peroxide as raw materials. Distilled water and thiourea were added to a stainless steel reaction tank, and hydrogen peroxide was added dropwise at 8 to 10 ° C. Under stirring to oxidize thiourea. The pH value is controlled at 2~3, and the crude product of thiourea dioxide crystal is obtained when the temperature drops to about 5 ℃. Then the product was obtained by centrifugal spin drying and cyclone drying. In addition, this product with ozone and thiourea as raw materials or calcium cyanamide, ammonium sulfide and hydrogen peroxide as raw materials can also be prepared.
Last Update：2022-01-01 10:38:04
Formamidine sulfinic acid - Introduction
Pure broken thiourea dioxide is a stable compound with neither oxidation nor reduction. Its solubility in water is 26.7g/L (20 ℃), and the PH value of saturated water melt is 5.0. Even in aqueous solution at 20-30 ℃, it is very stable, but heating the alkaline solution with thiourea dioxide has a high reduction potential (-1230Mv), which will decompose and free a reducing Sulfonic acid, so it reflects a strong reduction activity.
Last Update：2022-10-16 17:14:27
Formamidine sulfinic acid - Application
Open Data Verified Data
This product has high stability and can be used as a reducing agent in printing and dyeing industry to replace sodium hydrosulfite. For acrylonitrile polymerization process, can increase the tension of polyacrylonitrile fiber, improve its color. It can also be used as a pulp bleaching agent, a sensitizer for photographic film emulsions, a chemical agent for separating the rare metals rhodium and iridium, and a stabilizer for reinforcing polyethylene. This product is also widely used in the production of fine chemical products such as dyes, pharmaceuticals and spices.
Last Update：2025-08-19 16:24:40
Formamidine sulfinic acid - Safety
Open Data Verified Data
- the toxic effect of this product is similar to thiourea, but stronger than thiourea. The LD50 of rats was 0. 42mg/kg, and there was obvious accumulation effect. See thiourea for protection.
- This product is packaged in fiber barrels, lined with polyvinyl chloride plastic bags or moisture-proof paper, 25kg or 40kg per barrel. See thiourea for storage and transport requirements.
Last Update：2022-01-01 10:38:04
Formamidine sulfinic acid - Reference Information
| LogP | -3.37 at 25℃ |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | used as synthetic fiber auxiliaries, decoloring agents, photographic film emulsifiers, chloroprene polymerization agents, rhodium and iridium separation agents, etc. thiourea dioxide is widely used in the printing and dyeing industry as a reducing agent in wool bleaching, dyeing of vat dyes and sulfide dyes, reduction detergent for disperse dye dyeing, and dyeing decolorant. In organic synthesis, it is used to reduce ketone, quinone, nitro, azo, azo oxide, azo oxide, sub-biazo compound and organic sulfide. Thiourea dioxide is also used as a variety of decoloring agents, a sensitizer for photographic gelatinized latex, a chemical reagent for separating rare metals rhodium and iridium, which can improve the stability of polyethylene. The addition of thiourea dioxide in the evaporation process of polyacrylonitrile and polymerization can improve the color of polyacrylonitrile and is an important supporting product for the production of synthetic fibers. This product is also widely used in the production of fine chemical products such as medicine and spices. Reagents for the reduction of ketones to secondary alcohols. Separation of rare metals rhodium and iridium. Photographic latex sensitizer. PVC stabilizer. A simple reagent for reducing ketones to secondary alcohols It is widely used in the chemical and textile industries. It is a strong reducing agent and increasingly replaces the prominent position of hydrosulfite in the field of printing and dyeing |
| Production method | is obtained by the reaction of thiourea and hydrogen peroxide. When distilled water is added to the reaction pot, stirred, and the temperature in the pot is reduced to 8-10 ℃ with frozen brine, thiourea is added and hydrogen peroxide is added dropwise to control the dropping acceleration and keep the reaction temperature below 20 ℃. When the pH value is 3-5, the feed can be repeated. When the reaction will end, water can be added to make the reaction temperature no longer rise. When the pH value is 2-3 and the material temperature drops to about 5 ℃, the oxidation product can be put into a centrifuge to spin dry, and then dried in a spinning oven to obtain thiourea dioxide. The 1t product consumes 98% thiourea 1t and 30% hydrogen peroxide 3.4t. In addition, this product can also be prepared with ozone and thiourea as raw materials or calcium cyanamide, ammonium sulfide and hydrogen peroxide as raw materials. |
Last Update：2024-04-09 02:00:07
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Raw Materials for Formamidine sulfinic acid