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 ?
At present, common methods for the synthesis of TTCP are limited to solid-state reactions at high temperatures, based on powder mixtures of CaC[O.sub.3] and dicalcium phosphate anhydrate (CaHP[O.sub.4]) 19], in which the particle size of powder is in the micron level, with calcination temperature higher than 1450[degrees] C.
Hence, it is likely that the anhydrate crystal has similar crystal system with the standard crystal data, which is triclinic.
Gartner, Geert-Jan Witkamp, "Mixed solvent reactive recrystallization of trona (sodium sesqui-carbonate) into soda (sodium carbonate anhydrate)", Hydrometallurgy 88 (2007) pgs 75-91.
The [Et.sub.2]O extract was dried over anhydrate [Na.sub.2][SO.sub.4] and evaporated to leave 3.9 g bases, which contained as major active constituents, alkaloids at around 96.1%, and polysaccharides at around 1.2%.
Hydrogen from its methane gas will combine in a synthetic reaction with nitrogen from the air to turn out anhydrate ammonia, which is used as the feedstock for fertilizer; Gas is the main element in the urea production cost accounting for 50%-60% of the total production cost of urea fertilizer.
The facts in BMS fit a selection patent scenario because the prior art contained a Greek patent application (that had been filed by a predecessor of BMS) that was nearly identical to the patent at issue except that it did not disclose the improved stability of the monohydrate form relative to the anhydrate form of cefipime dihydrochloride.
5 gives an example from a study on self-healing capacity of concrete due to anhydrate cement left after hydration (He et al., 2007).