Chlorosulfonic acid

CAS 7790-94-5ClSO3HAcids & Bases

Chlorosulfonic acid (CAS 7790-94-5, ClSO3H) is a highly reactive inorganic acid. It is a colourless to pale yellow fuming liquid, known for its strong corrosive properties and its ability to react violently with water. This potent chemical is primarily employed as a versatile reagent in organic synthesis, particularly for the introduction of sulfonyl chloride groups, and in the production of various organic compounds.

Email us

Chlorosulfonic acid (ClSO3H) — chemical structure, CAS 7790-94-5; Chemistry, fine chemical supplied by Tech Serve Solutions

AcidsAcids & BasesChemical SynthesisInorganic AcidsSynthetic Reagents

01 /Applications

Sulfonating Agent

Chlorosulfonic acid is a powerful sulfonating agent, widely used in organic chemistry to introduce the $-\text{SO}_2\text{Cl}$ group into aromatic compounds. This process is crucial for synthesizing pharmaceuticals, dyes, and detergents.

Detergent Intermediate

It serves as a key intermediate in the manufacture of detergents and surfactants. The reactions involving chlorosulfonic acid facilitate the creation of molecules with desirable cleaning properties.

Chemical Synthesis Reagent

This compound is a versatile reagent utilized in a broad range of chemical syntheses, including the preparation of sulfonic acids, sulfonyl halides, and other sulfur-containing organic molecules.

Dehydrating Agent

In certain specific applications, chlorosulfonic acid can act as a dehydrating agent, although its highly reactive nature requires careful control and specialized handling.

02 /Properties

Molecular weight	116.52
Linear formula	ClSO3H
Assay	99%
Boiling point	151-152 °C/755 mmHg(lit.)
Density	1.753 g/mL at 25 °C(lit.)
Refractive index	n20/D 1.433(lit.)
Vapour pressure	1 mmHg (25 °C)3.3 mmHg (37.7 °C)
Vapour density	4 (vs air)

03 /Safety & handling

Precautionary statements

P261Avoid breathing dust, fume, gas or vapours
P280Wear protective gloves, clothing and eye/face protection
P305IF IN EYES
P310Immediately call a POISON CENTER or doctor

Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.

04 /Identifiers & registry

CAS number

7790-94-5

05 /Quality & supply

Documentation

Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.

Supply & logistics

Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.

06 /Frequently asked questions

What is Chlorosulfonic acid used for?

Chlorosulfonic acid is predominantly used as a sulfonating agent in organic synthesis, for producing detergents, and as a general synthetic reagent for creating sulfur-containing organic compounds.

What is the CAS number and formula for Chlorosulfonic acid?

The CAS number for Chlorosulfonic acid is 7790-94-5, and its linear formula is ClSO3H.

What grade and purity does Tech Serve Solutions supply?

Tech Serve Solutions supplies Chlorosulfonic acid with an assay of 99%. We do not represent this product as USP, BP, or EP grade.

What are the safety and handling considerations for Chlorosulfonic acid?

Chlorosulfonic acid is highly corrosive and reacts violently with water, producing hazardous fumes. Handle with extreme care in a well-ventilated area, using appropriate personal protective equipment (P261, P280, P305 + P351 + P338, P310).

How is Chlorosulfonic acid packed, shipped, and exported?

Chlorosulfonic acid is carefully packed according to international safety standards for hazardous materials. Tech Serve Solutions has extensive experience in exporting chemicals worldwide.