What are the physical and chemical properties of acetic anhydride?

Acetic anhydride generally refers to acetic anhydride. It is a colorless transparent liquid, with a strong acetic acid odor, sour taste, hygroscopic, soluble in chloroform.

and ether, which slowly dissolves in water to form acetic acid, with ethanol.

action to form ethyl acetate.

Relative density. , melting point -73, boiling point 139, refractive index, flash point 49, ignition point 400. Low toxicity, flammable, corrosive, do not touch ** or eyes, in case of damage, tear gas.

Chemical reactions can occur in contact with strong oxidizing agents. It can make alcohol, phenol, ammonia and amine form acetate and acetamide compounds respectively. In the presence of Lewis acid, acetic anhydride.

It can also make aromatic hydrocarbons.

or acetylation of olefins. in sodium acetate.

In the presence of acetic anhydride, acetic anhydride undergoes a condensation reaction with benzaldehyde to form cinnamic acid. Slowly dissolves in water to become acetic acid. It reacts with alcohols to form acetate.

Physical properties: Acetic anhydride (acetic anhydride) is a colorless transparent liquid with a pungent and spicy smell.

Chemical properties: chemical formula (CH3CO)2O, the structure is as follows, also known as "acetic anhydride", "acetic anhydride". Colorless, acetic acid odorant liquid.

Melting point -73, boiling point 139, easy to burn, not miscible with water, hydrolyzed into acetic acid after placement. Dissolved in ethanol and formed into ethyl acetate in solution. Soluble in ether, benzene and chloroform.

It can be dissolved in ethanol and water with ether in any ratio to release the heat of decomposition, hydrolyzed into acetic acid, soluble in alcohol, ether, acetone and other organic solvents.

Density is another name acetic anhydride; acetic anhydride; Acetic anhydride.

Molecular Formula C4H6O3 (ch3co)20

Molecular weight flash point: 49

Melting point boiling point: Density Relative density (water = 1).

Relative density (air = 1).

CH3CO)2O molecular weight 102 09

Colorless and volatile liquid, with strong acetic acid gas. Density 1 08g cm3 (15). Melting Point -73 1.

Boiling point 139 6 . Flash point 54 4. Spontaneous ignition point 400.

The refractive index is 1 3904. Soluble in chloroform, ether. Slowly dissolves in water to become acetic acid.

It reacts with alcohol to form ethyl acetate. Flammability. It is highly corrosive. Poisonous.

Acetic anhydride generally refers to acetic anhydride, and the other name is acetic anhydride.

Acetic anhydride is an organic substance, containing a colorless transparent liquid, with a strong acetic acid odor, sour taste, hygroscopic, soluble in chloroform, slowly dissolved in water to form acetic acid, and ethanol.

action to form ethyl acetate.

Flammable, corrosive, tear-jerking. Acetic anhydride is an important acetylation reagent, acetic anhydride is used in the manufacture of cellulose ethonachate ester, acetate plastic, non-combustible motion picture film; It is used in the pharmaceutical industry to make synthetic mycin, dysentery, dibazole, caffeine and aspirin.

sulfonamide drugs, etc.; In the dye industry, it is mainly used for the production of dispersed dark blue HCl, dispersed red S-SWEL, dispersed yellow brown S-2rel, etc.; In the fragrance industry, it is used to produce coumarin, bornyl acetate, sunflower musk, cypress acetate, phenylethyl acetate, geranil acetate, etc.; Acetyl peroxide, manufactured from acetic anhydride, is an initiator and bleaching agent for polymerization reactions.

The corresponding carboxylic acid is generated.

The miscibility of acetic anhydride and acetic acid is as follows:1The molecular structures of acetic anhydride (C2H4O) and acetic acid (C2H4O2) are very similar, but the acetic anhydride molecule contains a double bond and the acetic acid molecule contains a carboxyl group (-Cooh).

2.The old branches of acetic anhydride and acetic acid are both polar molecules with certain polar functional groups, so they have certain similarity and mutual miscibility. 3.

However, the carboxyl group in the acetic acid molecule makes it more polar and the hydrogen bond forming ability is stronger, so the polarity of acetic acid is slightly greater than that of acetic anhydride. This will affect the mutual miscibility of the two to a certain extent. 4.

According to the principle of "similar substances have similar properties", the boiling point and dense content of acetic anhydride and acetic acid are closer, but the refractive index of acetic acid is slightly larger than that of acetic anhydride, which also reflects that the polarity of acetic acid is slightly greater than that of acetic anhydride. 5.Due to the difference in polarity, the miscibility of acetic anhydride and acetic acid is not complete.

In order of solubility from largest to smallest, acetic acid can be completely soluble in acetic anhydride, while acetic anhydride has slightly less solubility in acetic acid. When there is an excess of acetic anhydride, a homogeneous solution can be formed, and when there is an excess of acetic acid, two layers will be produced, the upper layer is a saturated solution of acetic acid, and the lower layer is a supersaturated solution of acetic anhydride. 6.

Therefore, in general, acetic anhydride and acetic acid have certain mutual miscibility, but the degree of mutual miscibility is affected by their respective polarity. The solubility of acetic acid in acetic anhydride is greater than that of acetic anhydride in acetic acid. But under certain conditions, the two can still form a stable and homogeneous solution.