anhydride


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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 ?
He said that to further crosscheck, samples were drawn from the chemical packed in plastic cans and were tested with the help of First Defender Kit to verify the contents and the results confirmed that it was Acetic Anhydride.
The seizure of huge quantity of Acetic Anhydride is unprecedented in Collectorate's history and it shows the commitment and resolve of the Pakistan Customs to safeguard society from pilferage of dangerous contrabands.
7 metric tons of acetic anhydride, a major component of improvised explosive devices (IEDs) and also used in illicit manufacturing of heroin.
Detailed information of all active plants and planned Phthalic Anhydride projects in Italy with capacity forecasts to 2019 and additional details such as process, technology, operator and equity
Detailed information of all active plants and planned Maleic Anhydride (MA) projects in Brazil with capacity forecasts to 2019 and additional details such as process, technology, operator and equity
The report “Phthalic Anhydride Market Analysis By Application (Phthalate Plasticizers, Unsaturated Polyester Resins, Alkyd Resins) And Segment Forecasts To 2020,” is available now to Grand View Research customers and can also be purchased directly at http://www.
The Government of Afghanistan informed the INCB that there is no legitimate use for acetic anhydride in Afghanistan and now seeks to block all imports of the substance.
The elevated anhydride concentration results in the acetylation of not only solvent accessible lysine residues, but some guanidine, imidazole, amide, alcohol, and thiol containing amino acid side chains as well.
Maleic anhydride, chloroform, and surfactant ethoxy alkyl sulphosuccinate (A-102) (all are analytical grade) was obtained from Guangzhou Xingang Chemical Co.
Maleic anhydride purris, isopropyl alkohol anhydrous (Sigma-Aldrich), N,N-dimethyl aniline purris.
The pthalic anhydride is used by the paints industry.
Reactive brominated flame retardants include tetrabromobisphenol A (BA-59P) and tetrabromophthalic anhydride (PHT-4) for epoxies and unsaturated polyesters.