how to prepare acetic anhydride ?

Question

related to chemistry

Answer 1

1. Fastest: Take equimolar acetyl chloride & glacial acetic acid, & heat - HCl goes off, distil the product to pure acetic anhydride.

2. C + H2 ---> electric arc ---> C2H2 ------> acetaldehyde ----> acetic acid ----> acetyl chloride[50%] & acetic acid [rest] , if both these are pure enough, proceed as in 1

Answer 2

take 15 ml of acetic acid in a boiling tube. Put a cork with a hole on the test tube and heat it till it is reduced to 2 ml(approximately) and the acetic anhydride is prepared.

Answer 3

acetyl chloride can easily be converted to ester form because chloride is such a good leaving group. The -OH in acetic acid is not a very good leaving group so converting it to an ester is more complicated

Answer 4

Acetic anhydride Chemical Properties,Usage,Production

Chemical Properties

Colorless liquid

Usage

Acetic anhydride is an important solvent and acetylation agent. It is used for the manufacture of acetylcellulose, acetylsalicylic acid, acetanilide, nitrofurane, sulfonamides, vitamin B6 etc. Product Data Sheet

General Description

A clear colorless liquid with a strong odor of vinegar. Flash point 129°F. Corrosive to metals and tissue. Density 9.0 lb /gal. Used to make fibers, plastics, pharmaceuticals, dyes, and explosives.

Air & Water Reactions

Flammable. Reacts violently with water to generate acetic acid . This reaction is heightened by the presence of mineral acids (nitric, perchloric, sulfuric acid, etc.) [Chem. Eng. News 25, 3458].

Reactivity Profile

Acetic anhydride reacts violently on contact with water, steam, methanol, ethanol, glycerol and boric acid. Reaction with water is particularly dangerous in presence with mineral acids (e.g., nitric, perchloric, chromic, sulfuric acid) [Chem. Eng. News 25, 3458]. Potentially explosive reactions with oxidizing reagents such as barium peroxide, chromium trioxide, chromic acid, hypochlorous acid, nitric acid, perchloric acid, peroxyacetic acid, potassium permanganate, hydrogen peroxide. [Sax, 9th ed., 1996, p. 15]. Reacts violently with metal nitrates used as nitrating agents [Davey W. et al., Chem. & Ind., 1948, p. 814].

Health Hazard

Liquid is volatile and causes little irritation on uncovered skin. However, causes severe burns when clothing is wet with the chemical or if it enters gloves or shoes. Causes skin and eye burns and irritation of respiratory tract. Nausea and vomiting may develop after exposure.

Answer 5

YOU CAN BY TREATING ACID WITH CONCENTRATED H2SO4.