anhydride

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Related to Anhydrate: anhydrite, dehydration

anhydride

(ănhī`drīd, –drĭd) [Gr.,=without water], chemical compound formed by removing water, H2O, from another compound; the anhydride can also react with water to form the original compound. An acid anhydride reacts with water to form an acid; e.g., sulfur trioxide, SO3, reacts with water to form sulfuric acid, H2SO4. A basic anhydride reacts with water to form a base; e.g., calcium oxide, CaO, reacts with water to form calcium hydroxide, Ca(OH)2. Anhydrides of organic acids have many uses. They react with alcohols to form esters; e.g., acetic anhydride, (CH3CO)2O, reacts with ethanol, C2H5OH, to form ethyl acetate, CH3COOC2H5, a useful solvent. They also react with ammonia and primary or secondary amines to form amides. Other important acid anhydrides include maleic anhydride and phthalic anhydride.

anhydride

[an′hī‚drīd]
(chemistry)
A compound formed from an acid by removal of water.

anhydride

1. a compound that has been formed from another compound by dehydration
2. a compound that forms an acid or base when added to water
3. any organic compound containing the group -CO.O.CO- formed by removal of one water molecule from two carboxyl groups
References in periodicals archive ?
Shengtai enjoys several distinct advantages over its competitors, such as proximity to raw material supply, a dominate market share of 40% in Dextrose Monohydrate and 25% in Dextrose Anhydrate in China, vertically integrated manufacturing capability and geographical proximity, and cross-cultural similarities to the end markets in Asia.
A great amount of literature was focused on the toughening of nylon by use of various elastomers functionalized by maleic anhydrate (1), (3) or glycidyl methacrylate (2), (4).
To ensure complete removal of water, approximately 5mg of anhydrate sodium sulfate was added to the methanolic fraction and the sample was filtered.