Glacial acetic acids

Acetic acid Glacial 1 Ammonium persulfate Unknown s 

Acetic acid (glacial) 118° Not very inflammable puii- 

ACETIC ACID, GLACIAL. Pure (99.8%) acetic acid. 

Methyl acetate Acetic acid Glacial acetic Ethyl acetate column finishing column acid storage recovery coiumn 

To prepare pure acetic acid (glacial acetic acid), the crude aqueous product is converted into the sodium salt, the latter dehydrated by fusionf and then heated with concentrated sulphuric acid anhydrous acetic acid, b.p. 118°, distils over. Only the preparation of aqueous acetic acid and of crystalline copper acetate is described below. 

Aromatic amine (20 g), acetic acid anhydride (20 mL), acetic acid (glacial, 20 mL), and zinc powder (0.1 g) were mixed and refluxed. After 30 min the solution was poured into 500 mL of ice water and the precipitate was filtered and dried to obtain the acetanilide. 

Dimethoxytetrahydrofuran 4-Dimethylaminobenzaldehyde Acetic acid (glacial acetic acid) 

They are usually best obtained by dissolving the aldehyde in alcohol, and adding excess of an equimolecular mixture of semi-carbazide hydrochloride, and acetate of sodium. The mixture is allowed to stand for some time and the ssmi-carbazone then precipitated by the addition of water. Some semi-carbazones are more easily prepared by substituting free acetic acid (glacial) for the acetate of sodium. Semi-carbazones are beat recrystallis from hot methyl alcohol. 

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