Methanesulfonic acid
CAS Number:75-75-2
Chemical Formula:CH4O3S
Synonyms:
acidemethanesulfonique
Kyselina methansulfonova
kyselinamethansulfonova
Appearance:Colorless Liquid
MOQ (Minimum Order Quantity):1 FCL (Full Container Load)
Methanesulfonic acidCAS#75-75-2
Methanesulfonic acid (CH3SO3H, MSA) is a strong organic acid. It is largely formed through the chemical oxidation of dimethyl sulfide in the atmosphere. MSA can biodegrade into carbon dioxide and sulfate, making it a green acid with lower toxicity and less corrosiveness than common mineral acids. Aqueous MSA solution is often used as a model electrolyte in electrochemical processes.
Methanesulfonic acid is an alkanesulfonic acid in which a methyl group is directly attached to the sulfo group. It functions as a metabolite in Escherichia coli. It is classified as an alkanesulfonic acid and a one-carbon compound, and it serves as the conjugate acid of methanesulfonate.
Methanesulfonic acid Chemical Properties
| Item | Value |
| Melting point | 17-19 °C (lit.) |
| Boiling point | 167 °C/10 mmHg (lit.) |
| density | 1.475-1.485 g/mL at 20 °C 1.481 g/mL at 25 °C (lit.) |
| vapor density | 3.3 (vs air) |
| vapor pressure | 1 mm Hg (20 °C) |
| refractive index | n20/D 1.429(lit.) |
| Fp | >230 °F |
| storage temp. | 2-8°C |
| solubility | water: soluble 1,000 g/L at 20°C |
| form | Solution |
| pka | -2.6(at 25℃) |
| Specific Gravity | 1.48 (18/4℃) |
| color | brown |
| biological source | synthetic |
| Water Solubility | Miscible with water. Slightly miscible with benzene and toluene. Immiscible with paraffins. |
| λmax | λ: 240-320 nm Amax: <0.4 |
| Sensitive | Light Sensitive & Hygroscopic |
| Merck | 14,5954 |
| BRN | 1446024 |
| Stability | Stable. Moisture sensitive. Incompatible with amines, bases, water, common metals. Releases a large amount of heat when diluted with water. |
| InChI | 1S/CH4O3S/c1-5(2,3)4/h1H3,(H,2,3,4) |
| InChIKey | AFVFQIVMOAPDHO-UHFFFAOYSA-N |
| SMILES | O=S(O)(C)=O |
| CAS DataBase Reference | 75-75-2(CAS DataBase Reference) |
| NIST Chemistry Reference | CH3SO3H(75-75-2) |
| EPA Substance Registry System | Methanesulfonic acid (75-75-2) |
Safety Information
| Item | Value |
| Hazard Codes | C |
| Risk Statements | 34-22-21/22-35 |
| Safety Statements | 26-36-45-1/2-36/37/39 |
| RIDADR | UN 3265 8/PG 2 |
| WGK Germany | 1 |
| RTECS | PB1140000 |
| TSCA | TSCA listed |
| HazardClass | 8 |
| PackingGroup | III |
| HS Code | 29041000 |
| Storage Class | 8A – Combustible corrosive hazardous materials |
| Hazard Classifications | Acute Tox. 4 Dermal Acute Tox. 4 Oral Eye Dam. 1 Met. Corr. 1 Skin Corr. 1B STOT SE 3 |
| Hazardous Substances Data | 75-75-2(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: 649 mg/kg LD50 dermal Rabbit 200 – 2000 mg/kg |
Product Application Of Methanesulfonic acid CAS#75-75-2
Methanesulfonic acid acts as a catalyst in esterification, alkylation and condensation reactions because of its low volatility and good solubility in organic solvents. It is used in manufacturing starch esters, wax oxidate esters, benzoic acid esters, phenolic esters and alkyl esters. It reacts with sodium borohydride in tetrahydrofuran to prepare borane-tetrahydrofuran complex.
It is used in batteries due to its high purity and lack of chloride. In the pharmaceutical industry, it helps produce active pharmaceutical ingredients such as telmisartan and eprosartan. It is applied in ion chromatography and provides carbon and energy for some gram-negative methylotropic bacteria. It also takes part in peptide deprotection.
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