[Chemical Knowledge]：

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acetic anhydride, also known as acetic anhydride, is a colorless and transparent liquid with a strong sour taste. Its vapor is tear gas. It can be miscible with chloroform, benzene, and ether. Soluble in water. Mix with water to produce acetic acid. Soluble in ethanol to produce ethyl acetate. Flammable, its vapor and air can form an explosive mixture, which can cause combustion and explosion when exposed to open flames and high heat energy. Contact with strong oxidants can cause chemical reactions.

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Six functions and uses

of acetic anhydride 1. Used to test alcohols, aromatic primary amines and secondary amines

2. Used in organic synthesis, dyes, pharmaceutical industry and the manufacture of acetyl compounds.

3. Used to produce modified starch

4. Used as an active modifier, through autoclave impregnation and subsequent acetylation, to make wood durable and durable.

5. Used to produce aspirin (acetylsalicylic acid)

6. Used to convert cellulose into cellulose acetate, which is a component of photographic films and other coating materials and is used to make cigarette filters

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