571024

Chlorosulfonic acid

99%

• Synonym(s): Sulfuric chlorohydrin
• Linear Formula: ClSO₃H
• CAS Number: 7790-94-5
• Molecular Weight: 116.52
• EC Number: 232-234-6
• MDL number: MFCD00011523
• UNSPSC Code: 12352100
• PubChem Substance ID: 24880605
• NACRES: NA.21

Properties

• vapor density: 4 (vs air)
• Quality Level: 200
• vapor pressure: 1 mmHg ( 25 °C); 3.3 mmHg ( 37.7 °C)
• Assay: 99%
• expl. lim.: 37.7 %
• refractive index: n20/D 1.433 (lit.)
• bp: 151-152 °C/755 mmHg (lit.)
• solubility: acetic acid: soluble(lit.); chloroform: soluble(lit.); dichloromethane: soluble(lit.)
• density: 1.753 g/mL at 25 °C (lit.)
• SMILES string: OS(Cl)(=O)=O
• InChI: 1S/ClHO3S/c1-5(2,3)4/h(H,2,3,4)
• InChI key: XTHPWXDJESJLNJ-UHFFFAOYSA-N

Description

General description

Chlorosulfonic acid is a strong acid that is synthesized on an industrial scale by reacting sulfur trioxide and dry hydrogen chloride gas in an equimolar ratio. It can act as a sulfonating, dehydrating, oxidizing and chlorinating agent. It is reported to be a better electrophilic olefin cyclization agent in comparison to other sulfonic acids. Its infrared spectra in the solid, liquid and gaseous state have been recorded in the region 4000-400cm^-1.

Application

Chlorosulfonic acid may be used in the following processes:

• Synthesis of di-n-butyl ammonium chlorosulfonate, a secondary amine ionic liquid.
• To prepare sulfonated polyethersulfone (SPES) with enhanced hydrophilic property.
• To attach sulfate group to silk fibroin for improving its anticoagulant ability.
• As a catalyst to prepare substituted coumarin, via von Pechmann condensation between phenol and β-ketoester.
• As a substitute to acid catalyst in Biginelli reaction to prepare 3,4dihydropyrimidines.

Packaging

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Safety Information

• Pictograms: GHS06,GHS05
• Signal Word: Danger
• Hazard Statements: H314,H330,H335
• Precautionary Statements: P260 - P271 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338
• Hazard Classifications: Acute Tox. 1 Inhalation - Eye Dam. 1 - Skin Corr. 1A - STOT SE 3
• Target Organs: Respiratory system
• Supplementary Hazards: EUH014
• Storage Class Code: 6.1B - Non-combustible acute toxic Cat. 1 and 2 / very toxic hazardous materials
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves