Sulfuryl chloride

• Schwefelsäuredichlorid
• Sulfuryldichlorid
• Sulfonyl chloride

Colorless liquid with a pungent odor

Liquid

1.67 g · cm -3 ( 20 ° C)

-54.1 ° C

69.4 ° C

144.3 hPa (20 ° C)

Slow decomposition in water

Risk

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Sulfuryl chloride is a colorless, corrosive in presence of water acting liquid which is included in the group of the inorganic acid chlorides. It is the dichloride of sulfuric acid.

Production and representation

It is formed from sulfur dioxide and chlorine on charcoal catalyst or by decomposition of chlorosulfonic acid:

Properties

Physical Properties

Sulfuryl chloride is a highly mobile, fuming in moist air, liquid, which may be due to their relatively low boiling point evaporates easily from 69 ° C and easily purified by distillation. It has a typical for many halogen compounds high density of 1.6674 g · cm -3

Chemical Properties

With water sulfuryl chloride reacts very violent decomposition and heat generation to sulfuric acid and hydrogen chloride:

Further, it reacts violently with bases and with lower alcohols.

Use

From sulfuryl chloride ( sulfochlorides ) can be prepared by electrophilic aromatic substitution aromatic sulfonyl chlorides. Furthermore, it can be used in the presence of a free radical initiator for the free radical chlorination of alkanes and cycloalkanes. Arise in the latter reaction as gaseous by-products of sulfur dioxide and hydrogen chloride.

Safety

Sulfuryl chloride is corrosive and attacks the skin and especially mucous membranes and eyes fierce. When working a well -withdrawing deduction is to be used and the personal protective equipment to wear ( coat, safety goggles, gloves ).

Residues of sulfuryl chloride must be entered with extreme care taken in small portions in an ice / water mixture. The then obtained sulfuric acid -hydrochloric acid mixture is carefully neutralized with a suitable base, before it is fed to the proper disposal.