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Dimethyl sulfoxide: 4500 yuan CA S: 67-68-5 (D for short) MS OCS: 200-664-3 Molecular formula: C2H6OS Molecular weight: 78.12 220kg/barrel
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Introduction to dimethyl sulfoxide
Dimethyl sulfoxide (DMSO) is an organic compound. Its molecular formula is (CH3) 2SO. It is a colorless and odorless transparent liquid at room temperature. It is a hygroscopic flammable liquid with high polarity, high boiling point, nonprotonic, water miscible characteristics, good thermal stability, and can be soluble in water, ethanol and other organic substances. It is known as "energetic solvent". It is one of the commonly used organic solvents with strong solubility. It can dissolve most organic substances, including carbohydrates, polymers, peptides, and many inorganic salts and gases. It can dissolve 50-60% of its own solute by weight (other general solvents can only dissolve 10-20%), so it is very important in sample management.
Dimethyl sulfoxide is widely used as solvent and reaction reagent, especially as processing solvent and filament solvent in polymerization. Dimethyl sulfoxide itself has anti-inflammatory, analgesic and diuretic properties. Sedative and other effects are often used as analgesic active group. It has a special property that is very easy to penetrate the appearance, which makes the user feel like an oyster. Dimethyl sulfoxide is used as an extractant by many chemical enterprises. However, due to the high boiling point of DMSO, the operating temperature is too high, causing coking of materials, affecting the recovery of dimethyl sulfoxide and equipment cleaning, and increasing energy consumption. Therefore, the recovery of DMSO has become a bottleneck for its further use as an extractant.
Physicochemical properties of dimethyl sulfoxide
Melting point: 18.4 ° C;
Boiling point: 189 ° C (lit.);
Density: 1.100 g/mL at 20 ° C;
Vapor density: 2.7 (vs air);
Vapor pressure: 0.42 mm Hg (20 ° C);
Refractive index: n20/D 1.479 (lit.);
Flash point: 192 ° F;
Freezing point: 18.4 ℃
1. Colorless liquid, flammable, almost odorless, with bitter taste. This product is an organic solvent with high polarity, which can be mixed with water in any proportion. It can dissolve general organic solvents except petroleum ether. Absorb 30% (weight) at 20 ℃; Sulfur dioxide 65% by weight. It has strong hygroscopicity. At 20 ℃, when the relative humidity is 60%, it can absorb 70% of its own weight of moisture from the air. The product is weak, and water free dimethyl sulfoxide is non corrosive to metals. For iron when containing water; Copper and other metals are corrosive, but not corrosive to aluminum. Stable to alkali. Heating in the presence of acid produces a small amount of compound. It decomposes at high temperature, and reacts violently when encountering chlorine. It burns in the air and emits a light blue flame.
2. Dimethyl sulfoxide has water absorption and needs drying treatment before use.
Industrial use of dimethyl sulfoxide
Dimethyl sulfoxide (DMSO) is a very important nonprotonic polar solvent that is soluble in both water and organic solvents. It is widely used as solvent and reaction reagent with high selective extraction ability.
1. Solvent for aromatics extraction, reaction medium of resin and dye, acrylic fiber polymerization, spinning, etc
2. It can be used as organic solvent, reaction medium and organic synthesis intermediate. It is widely used. This product has high selective extraction ability.
Dimethyl sulfoxide can also be used as the dyeing solvent, dye remover and dyeing carrier of synthetic fibers, as well as the absorbent for recovering acetylene and sulfur dioxide, synthetic fiber modifier, antifreeze, capacitor medium, brake oil, rare metal extractant, etc.
3. It is used as an analytical reagent, a stationary liquid for gas chromatography, and a solvent for ultraviolet spectral analysis
4. Transdermal enhancer. Dimethyl sulfoxide (DMSO) is one of the early used transdermal penetration enhancers, and its penetration properties may be related to its solvability. Dimethyl sulfoxide can denature proteins in outer keratinocytes; It can destroy the orderly arrangement of lipids between cells in the stratum corneum; It can remove the lipids and lipoproteins in the stratum corneum and enhance the permeability.
5. Antifreeze. The freezing point of pure dimethyl sulfoxide is 18 Dimethyl sulfoxide with 40% water content will not freeze at 45 ℃ - 60 ℃, and it will release heat when mixed with water and snow. Therefore, it is convenient to make automobile antifreeze, brake oil and hydraulic fluid components. Ethylene glycol antifreeze is no longer applicable when the temperature exceeds - 40 ℃, and the boiling point is lower than that of dimethyl sulfoxide, which is easy to produce gas resistance. Dimethyl sulfoxide antifreeze is used in automobiles and combat vehicles in northern severe cold areas, and can be supplemented with snow instead of water at any time. Dimethyl sulfoxide is also used as deicer, coating, antifreeze for various emulsions, antifreeze for gasoline and aviation kerosene.
