471356

Methanesulfonic acid

≥99.0%

• Synonym(s): Mesylic acid, MsOH
• Linear Formula: CH₃SO₃H
• CAS Number: 75-75-2
• Molecular Weight: 96.11
• Beilstein: 1446024
• EC Number: 200-898-6
• MDL number: MFCD00007518
• UNSPSC Code: 12352100
• PubChem Substance ID: 24870726
• NACRES: NA.21

Properties

• vapor density: 3.3 (vs air)
• Quality Level: 200
• vapor pressure: 1 mmHg ( 20 °C)
• Assay: ≥99.0%
• form: liquid
• refractive index: n20/D 1.429 (lit.)
• bp: 167 °C/10 mmHg (lit.)
• mp: 17-19 °C (lit.)
• solubility: water: soluble 1,000 g/L at 20 °C
• density: 1.481 g/mL at 25 °C (lit.)
• SMILES string: O=S(O)(C)=O
• InChI: 1S/CH4O3S/c1-5(2,3)4/h1H3,(H,2,3,4)
• InChI key: AFVFQIVMOAPDHO-UHFFFAOYSA-N

Description

General description

Methanesulfonic acid (MSA) is a strong organic acid. The chemical oxidation of dimetyl sulfide in the atmosphere leads to the formation of MSA in large quantities. MSA undergoes biodegradation by forming CO₂ and sulphate. It is considered a green acid as it is less toxic and corrosive in comparison to mineral acids.1 The aqueous MSA solution has been considered a model electrolyte for electrochemical processes.

Application

Methanesulfonic acid may be used:

• As a catalyst to produce linear alkylbenzenes by the addition reaction between long-chain olefins and benzene.
• To prepare polyaniline (PANI)/graphene composites with enhanced thermal and electrical properties.
• As a catalyst for the transformation of glucose/xylose mixtures to levulinic acid and furfural.

Safety Information

• Pictograms: GHS05,GHS07
• Signal Word: Danger
• Hazard Statements: H290 - H302 + H312 - H314 - H335
• Precautionary Statements: P234 - P261 - P280 - P301 + P312 - P303 + P361 + P353 - P305 + P351 + P338
• Hazard Classifications: Acute Tox. 4 Dermal - Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1B - STOT SE 3
• Target Organs: Respiratory system
• Storage Class Code: 8A - Combustible, corrosive hazardous materials
• WGK: WGK 1
• Flash Point(F): 372.2 °F - closed cup
• Flash Point(C): 189 °C - closed cup
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves