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| methanesulfonic acid | |||||
| Bacis information | |||||
| CAS | 75-75-2 | ||||
| English alias | Methanesulfonic Acid;Methanesulfonic acid | ||||
| Molecular formula | CH4O3S | ||||
| Molecular weight | 96.1057 | ||||
| Accurate mass | 95.9881 | ||||
| Psa | 62.75 | ||||
| Logp | 0.5848 | ||||
| Numbering system | |||||
| UNII | |||||
| BRN number | |||||
| EINECS number | |||||
| MDL number | MFCD00007518 | ||||
| RTECS number | |||||
| PubChem number | |||||
| Physicochemical property | |||||
| Appearance and properties | Colorless to light yellow liquid | ||||
| Density | 1.481g/mLat 25°C(lit.) | ||||
| Boiling point | 167°C10mm Hg(lit.) | ||||
| Melting point | 19 °C | ||||
| Freezing point | |||||
| Flash point | >230°F | ||||
| Refractive index | n20/D 1.429(lit.) | ||||
| Water solubility | |||||
| Stability | Stable. Moisture sensitive. Incompatible with amines, bases, water, common metals. Releases a substantial amount of heat when diluted with water (add acid to water with care if diluting). | ||||
| Storage conditions | The warehouse is ventilated and dry at low temperature, and stored separately from oxidants and alkalis | ||||
| Safety information | |||||
| RTECS number | PB1140000 | ||||
| Security description | S26-S36-S45-S1/2-S36/37/39 | ||||
| Danger category code | R34 | ||||
| WGK germany | 1 | ||||
| Dangerous goods transport code | UN 3265 8/PG 2 | ||||
| Customs code | 2904100000 | ||||
| Hazard category | 8 | ||||
| Packing Grade | III | ||||
| Hazard Prevention Note | P301 + P312 + P330; P303 + P361 + P353; P304 + P340 + P310; P305 + P351 + P338 | ||||
| Signal word | |||||
| Danger mark | C | ||||
| Production method and use | |||||
| Production method | It is obtained by oxidation of methyl thiocyanate by nitric acid. The nitric acid and negative water are carefully heated to 80-88ºC, and methyl thiocyanate is added in stages, and the temperature automatically rises to about 105ºC. After the reaction is moderated, it is heated to 120ºC and reacts for 5 hours to obtain crude products. Dilute the crude product with exchange water, add 25% barium hydroxide solution to pH value 8-9, and filter. The filtrate was shrunk to the point of crystallization, which was washed with methanol to remove the nitrate and obtain barium methanesulfonate. Then the base is added to the exchange water and boiled, and sulfuric acid is added while hot to decompose, filter, and concentrate the filtrate under reduced pressure until no water is produced. The other method is obtained by chlorination, oxidation and hydrolysis of methyl isothiourea sulfate. Methyl isothiourea sulfate is added to water, and chlorine gas is introduced at 20-25ºC until the color of the solution turns yellow, and there is an oil layer at the bottom of the bottle, the temperature drops, and a large amount of residual chlorine is discharged from the exhaust pipe, which is the reaction endpoint. The reaction solution was extracted with chloroform. After drying, the extraction solution was steamed under atmospheric pressure at 60-62ºC, and then distilled under vacuum. The methylsulfonyl chloride was obtained by collecting 60-65ºC(2.67kPa) fractions. The base was added to 80ºC hot water under stirring and hydrolyzed for about 2 hours until the oil droplets in the reaction liquid disappeared. The reaction liquid is concentrated to syrupy shape under reduced pressure, diluted with water, and then concentrated under reduced pressure until no water can be steamed, methanesulfonic acid is obtained. | ||||
| Use | Electronic plating. | ||||
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