Methane sulfonic acid

Methane sulfonic acid

CAS Number: 75‑75‑2

Synonyms: Methanesulfonic acid; Methylsulfonic acid; Mesylic acid

Chemical Formula:CH₄O₃S

Molecular Weight:96.11 g/mol

Product Introduction

A clear, hygroscopic, non‑oxidizing, strong alkanesulfonic acid—often considered a "green" alternative to mineral acids. Used as a catalyst, acidifier, electrolyte, and reagent in chemical, pharmaceutical, electroplating, and oilfield applications.

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Physical & Chemical Properties

Property Value
Appearance Colorless to light-yellow liquid or solid ≥99% purity
Density @ 20 °C ~1.48 g/mL
Melting Point ~17–19 °C
Boiling Point ~167 °C at 10 mmHg (~122 °C at 1 mmHg)
Vapor Pressure @ 20 °C ~1 mm Hg
Refractive Index (n₂₀ᴅ) ~1.429
Solubility Miscible with water, alcohols, ethers; insoluble in alkanes
pKₐ ~–1.9 (strong acid)
Flash Point > 110 °C (>230 °F)

Applications

  • Catalyst in esterification, alkylation & polymerization
  • Electroplating electrolyte (nickel, copper, tin)
  • Oilfield acidizing for well stimulation (scale removal)
  • "Green" acid in organic synthesis & pharmaceutical APIs
  • Electrolyte in battery research, peptide deprotection, ion chromatography

Safety & Handling

  • Corrosive; causes severe skin/eye irritation. Store cool (<15 °C), under inert atmosphere, use corrosion‑resistant equipment.

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