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General
- Acetic
Anhydride is a clear, colorless liquid with a very pungent,
penetrating, vinegar-like odor that combines with water to form
acetic acid. It is soluble in ether, chloroform and benzene.
- Acetic
anhydride is the chemical compound with the formula (CH3CO)2O.
Commonly abbreviated Ac2O, it is one of the simplest acid
anhydrides and is a widely used reagent in organic synthesis.
Process
- Acetic
anhydride is produced by carbonylation of methyl acetate.
- Acetic
anhydride can by prepared by the dehydration of acetic acid
at 800°C.
- The
reaction between the acid chloride and a salt of acetic acid
yields acetic anhydride and a salt.
Uses
-
The primary use of acetic anhydride is used in the
manufacture of cellulose acetate for films and plastic
goods; about 75 percent of the acetic anhydride produced
annually in the United States is used for this purpose.
-
Approximately 1.5 percent of the annual acetic anhydride
production is used in the synthesis of aspirin.
-
Acetic anhydride other uses include the manufacture of
industrial chemicals, pharmaceuticals, perfumes,
plastics, synthetic fibers, explosives, and weed
killers.
Report
-
Most
acetic anhydride is used captively in the production
of cellulose acetate for filter tow and fiber.
Eastman capacity includes 1,200 million pounds of
material based on synthesis gas from coal, and 600
million pounds based on the ketene process.
-
About
42 percent of acetic anhydride is consumed in
cellulose acetate flake used to produce filter tow.
-
Acetic anhydride is a mature product with over 85
percent of production going into cellulose acetate
flake, which in turn, serves well-established
markets in filament yarn, cigarette filter tow and
cellulose ester plastics.
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