Product Overview

Thionyl chloride is a pale yellow to reddish liquid with a suffocating odor, reminiscent of sulfur dioxide. It fumes in moist air and is a crucial chlorinating agent in organic compound manufacturing. This compound, also used as a solvent in high-energy lithium batteries, exhibits highly reactive properties, reacting violently with water and posing health and environmental hazards.

Characteristic Data

Property Value
Density 1.64 g/cm³
Formula SOCl2
Molar Mass 118.97 g/mol
Boiling Point 76 °C
Vapor density 4.1 (vs air)
Vapor pressure 97 mm Hg ( 20 °C)
Flash point Store at RT
Storage temp 76 °C
Solubility Miscible with toluene, chloroform, benzene, carbon tetrachloride and diethyl ether.
Form Liquid
Color ≤50(APHA)
Odor Characteristic, pungent odor
Water Solubility REACTS
Sensitive Moisture Sensitive


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In industrial manufacturing, thionyl chloride is employed in the synthesis of carboxylic acid chlorides. These resulting products often serve as crucial intermediates in the production of pharmaceutical active ingredients, crop protection agents, and dyes.

Acid. In liquid SO2, thionyl chloride (SOCl2) is considered acidic since, by definition, it yields SO2+ ions in the solvent.

Thionyl chloride, characterized by the chemical formula SOCl2, is an inorganic compound. This colorless liquid exhibits moderate volatility and is accompanied by an unpleasant acrid odor.

The higher cost of lithium thionyl chloride batteries compared to many other battery technologies is attributed to the expenses associated with raw materials and manufacturing processes. This elevated cost may render them prohibitively expensive for certain applications.

Thionyl chloride appears as a colorless to yellow fuming liquid with a suffocating pungent odor.

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