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Acid Anhydride Definition: An acid anhydride is a nonmetal oxide which reacts with water to form an acidic solution. In organic chemistry, an acid anhydride is a functional group consisting of two acyl groups joined together by an oxygen atom.Acid anhydride also refers to compounds containing the acid anhydride functional group. Acid anhydrides are named from the acids that created them.The 'acid' part of the name is replaced with 'anhydride'. For example, the acid anhydride formed from acetic acid would be acetic anhydride.cid anhydrides are named from the acids that created them. The 'acid' part of the name is replaced with 'anhydride'. For example, the acid anhydride formed from acetic acid would be acetic anhydride.
It is used to make simple esters widely used as plasticizers. It is used as in making unsaturated polyester resins, alkyd resins, polyester polyols, dyes and pigments, halogenated anhydrides, polyetherimide resins, isatoic anhydride and insect repellents.The meta form is isophthalic acid (1,3-benzenecarboxylic acid).he ortho form (1,2-benzenecarboxylic acid) is called simply phthalic acid. It is a white crystals decomposing at 191Â°C and slightly soluble in water and ether. This compound is mainly produced and marketed in the form of its anhydride produced by the oxidation of orthoxylene and naphthalene.