phthalic acid

phthalic acid
1. Chem. any of three isomeric acids having the formula C8H6O4, esp. the ortho isomer (orthophthalic acid), a colorless, crystalline, slightly water-soluble solid used chiefly in the manufacture of dyes, medicine, and perfume.
[1855-60]

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also called  1,2-benzenedicarboxylic Acid, 

      colourless, crystalline organic compound ordinarily produced and sold in the form of its anhydride. The annual production of phthalic anhydride exceeded 1,000,000 metric tons in the late 20th century; most of it was used as an ingredient of polyesters, including alkyd resins (vehicles for paints and enamels), and simple esters used as plasticizers for polyvinyl chloride and other polymers. Smaller quantities were consumed in the manufacture of anthraquinone (a dye intermediate), phenolphthalein (a laxative and acid-base indicator), and phthalocyanine pigments.

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Universalium. 2010.

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  • Phthalic acid — Phthalic acid …   Wikipedia

  • Phthalic acid — Phthalic Phthal ic, a. [Naphthalene + ic.] (Chem.) Pertaining to, or designating, a dibasic acid obtained by the oxidation of naphthalene and allied substances. [1913 Webster] {Phthalic acid} (Chem.), a white crystalline substance, {C6H4.(CO2H)2} …   The Collaborative International Dictionary of English

  • phthalic acid — [thal′ik, fthal′ik as′id] n. [(NA)PHTHAL(ENE) + IC] any of three isomeric acids, C6H4 (COOH) 2, esp. one ( ortho phthalic acid) obtained by oxidation of naphthalene or xylene and used in the manufacture of dyes, medicines, etc …   English World dictionary

  • phthalic acid — ftalio rūgštis statusas T sritis chemija formulė C₆H₄(COOH)₂ atitikmenys: angl. phthalic acid rus. фталевая кислота ryšiai: sinonimas – 1,2 benzendikarboksirūgštis …   Chemijos terminų aiškinamasis žodynas

  • phthalic acid — o Benzenedicarboxylic acid. * * * phthal·ic acid .thal ik n any of three isomeric acids C8H6O4 obtained by oxidation of various benzene derivatives * * * phthal·ic ac·id (thalґik) any of the isomers, but usually the ortho isomer, of the… …   Medical dictionary

  • phthalic acid — [ (f)θalɪk] noun Chemistry a crystalline acid derived from benzene, with two carboxylic acid groups attached to the benzene ring. Origin C19: shortening of naphthalic (see naphthalene) …   English new terms dictionary

  • phthalic acid — noun Etymology: International Scientific Vocabulary, short for obsolete naphthalic acid, from naphthalene Date: 1857 any of three isomeric acids C8H6O4 obtained by oxidation of various benzene derivatives …   New Collegiate Dictionary

  • phthalic acid — noun Any of three isomeric aromatic organic dicarboxylic acids, CH(COOH); especially the ortho isomer manufactured from naphthalene, used in the synthesis of dyes, perfumes and other compounds …   Wiktionary

  • phthalic acid — phthal′ic ac′id n. chem. any of three colorless, crystalline, isomeric acids having the formula C8H6O4, used chiefly in the manufacture of dyes, medicine, and perfume • Etymology: 1855–60 …   From formal English to slang

  • phthalic acid — n. Chem. one of three isomeric dicarboxylic acids derived from benzene. Derivatives: phthalate n. Etymology: abbr. of NAPHTHALIC: see NAPHTHALENE …   Useful english dictionary

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