CHLOROSULFONIC ACID

PRODUCT IDENTIFICATION

CAS NO. 7790-94-5

CHLOROSULFONIC ACID

EINECS NO. 232-234-6
FORMULA ClSO2OH
MOL WT. 116.52
H.S. CODE 2806.20
TOXICITY

 

SYNONYMS Monochlorosulfuric acid; CSA; Acide chlorosulfonique;
Sulfuric Chlorohydrin; Sulfonic Acid, Monochloride; 氯磺酸;
SMILES sulfur anhydride

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE clear to light yellow fuming liquid
MELTING POINT

-80 C

BOILING POINT

151 - 152 C

SPECIFIC GRAVITY

1.753

SOLUBILITY IN WATER Decomposes (to sulfuric acid and hydrochloric acid)
pH  
VAPOR DENSITY 4

AUTOIGNITION

 

NFPA RATINGS

Health: 4; Flammability: 0; Reactivity: 2

REFRACTIVE INDEX

 

FLASH POINT

 

STABILITY Stable under ordinary conditions.

APPLICATIONS

Sulfonic acid is a compound with general formula RSO2OH, where R is an aliphatic or aromatic hydrocarbon. It is a derivative of sulfuric acid (HOSO2OH) where an OH has been replaced by a carbon group or a compound where a hydrogen atom has been replaced by treatment with sulfuric acid; for example, benzene is converted to benzenesulfonic acid (water-soluble). Sulfonic acid has a sulfur atom bonded to a carbon atom of a hydrocarbon and bonded also to three oxygen atoms, one of which has been attached to a hydrogen atom. Sulfonic acid is acidic due to the hydrogen atom, stronger than a carboxylic acid. Sulfonic acid is one of the most important organo sulfur compounds in organic synthesis. Sulfonic acids are used as catalysts in esterification, alkylation and condensation reactions. Sulfonates are salts or esters of sulfonic acid. Sulfonic salts are soluble in water. Sulfonic acid and its salts present in organic dyes provide useful function of water solubility and or improve the washfastness of dyes due to their capabiltity of binding more tightly to the fabric. They are widely used in the detergent industry. Alkylbenzene sulfonic acid is the largest-volume synthetic surfactant because of its relatively low cost, good performance, the fact that it can be dried to a stable powder and the biodegradable environmental friendliness. Sulfonate cleaners do not form an insoluble precipitates in hard water. Sulfonic acid salts and esters are intermediates widely used in organic synthesis and particularly phenolic compounds and cation exchange resins. They are synthetic intermediate for a number of biologically active compounds and pharmaceutical candidates such as sulfa drugs. Short carbon chain metallic sulfonate is used in electroplating which is a process for applying a metallic coating on a metal surface by electrodeposition from a suitable electrolyte solution for imparting corrosion resistance and direct production of printed circuit boards without etching out of a piece of copper sheet.

Chlorosulfonic Acid is a corrosive, clear liquid; melting point -80 C; boiling point 151 C; soluble in chlorinated solvents. It is hygroscopic and lachrymatory strongly. It reacts with water to form HCl. Chlorosulfonic Acid is used to produce organic sulfonic aicds for the end applications of detergent, pharmaceuticals, pesticides, and dyes. It was a starting material to produce saccharin.

SALES SPECIFICATION

APPEARANCE

clear to light yellow liquid
CONTENT 98.0% min
SULFURIC ACID

2.0% max

Fe

0.01% max

TRANSPORTATION
PACKING

Iso-Tank

HAZARD CLASS 8 (9.2)
UN NO. 1754
OTHER INFORMATION
Hazard Symbols: T+ C, Risk Phrases: 14/35/37, Safety Phrases: 26/45