Product_introduction
Basic information:
Chemical formula: C ₂ H ₆ OS
Molecular weight: 78.13
Appearance: It is a colorless and odorless transparent liquid at room temperature, and is a hygroscopic flammable liquid.
Melting point: 18.4 ℃
Boiling point: 189 ℃
Flash point: 95 ℃
Water solubility: soluble
Relative density: 1100kg/m ³
Physical and chemical properties: It has high polarity, high boiling point, good thermal stability, non protonic properties, and can be miscible with water. It can also dissolve in most organic compounds such as ethanol, propanol, benzene, and chloroform, and is known as the "universal solvent". Heating in the presence of acid can produce small amounts of compounds such as methyl mercaptan and formaldehyde, which decompose at high temperatures. When exposed to chlorine, they can undergo violent reactions and burn in the air, emitting a light blue flame.
Production method: Generally, it is obtained by dimethyl sulfide oxidation method. Dimethyl sulfide is generated by the reaction of methanol and hydrogen sulfide with gamma alumina, and sulfuric acid reacts with sodium nitrite to produce nitrogen dioxide. Dimethyl sulfide then undergoes gas-liquid oxidation reaction with nitrogen dioxide at 60-80 ℃ to produce crude dimethyl sulfoxide, which is refined by vacuum distillation to obtain the final product. There are also processes that directly use oxygen for oxidation to produce crude products.
Chemical use:
Solvent: It is a good non proton polar solvent widely used as a reaction medium for aromatic hydrocarbon extraction, resins, and dyes. As a processing solvent and drawing solvent in acrylonitrile polymerization reaction, it is also a synthetic solvent for polyamide, polyimide and polysulfone resin, and can be used for aromatic hydrocarbon, butadiene extraction, etc.
Reaction medium: It can be used as a reaction medium in organic synthesis, which helps to improve reaction rate and yield. Many reactions that are difficult to carry out under conventional conditions can be smoothly carried out in dimethyl sulfoxide, such as nucleophilic substitution reactions, elimination reactions, double bond rearrangement, etc.
Intermediate: It can be used as an organic synthesis intermediate to participate in various chemical reactions and is used to synthesize compounds with special structures.
Fiber synthesis: used as a solvent for polymerization and spinning of polyacrylonitrile, acetate fibers, and other materials. In acrylic spinning, polymerizing acrylonitrile in dimethyl sulfoxide can obtain fluffy and easily dyed synthetic wool, which has the advantages of simple process, high solubility, and good product performance.
Paint dyes: can be used as solvents, co solvents, and antifreeze agents for paints, and are commonly used in water-based paints. Adding it in printing and dyeing can make the dyeing more uniform and eliminate color difference. It can also be used as a paint remover to remove various paint films, including epoxy resin.
Electronics industry: It can be used as an electrolyte for Farad level and ultra large capacity capacitors, and is also commonly used for cleaning electronic components and integrated circuits. It has excellent cleaning effects on organic, inorganic, and polymer materials, and is odorless, non-toxic, and easy to recycle.
Storage and transportation: It should be stored in a cool, ventilated, and dry place, and stored and transported according to the regulations for flammable and toxic substances. Due to its hygroscopicity, it should be sealed and stored to avoid moisture.
