They react with water to give carboxylic acids . Exposure to phthalic anhydride may occur during its use as a chemical intermediate in the plastics industry. A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. Dorp (Ber.,1874,7,P.578) obtained orthobenzoyl benzoic acid by heating phthalic anhydride with benzene in the presence of aluminium chloride. Published by Houghton Mifflin Harcourt Publishing Company. phthalic anhydride n (Elements & Compounds) a white crystalline substance used mainly in producing dyestuffs. Phthalic anhydride is a principal commercial form of phthalic acid. It reacts exothermically when in contact with water and as such can accelerate … (6,8) Phthalic anhydride has an odor threshold of 0.053 parts per million (ppm). (organic chemistry) The acid anhydride of phthalic acid. Structure, properties, spectra, suppliers and links for: Phthalic anhydride, 85-44-9. See more. "Recognised" - meaning that the concern is indicated in an official source. The reactions are sometimes slow, but can become violent when local heating accelerates their rate. The condensation of phthalic anhydride with phenols is used to obtain dyes, such as phenolphthalein. Search results for phthalic anhydride at Sigma-Aldrich. ¹ THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION … The American Heritage® Stedman's Medical Dictionary Phthalic acid has a chemical formula C 6 H 4 (CO 2 H) 2 and comprises a six-carbon benzene ring with two carboxylic acid groups (-COOH) attached. Phthalic anhydride is the cyclic dicarboxylic anhydride that is the anhydride of phthalic acid. Phthalic anhydride is the anhydride of phthalic acid. “That” vs. “Which”: When Do You Use Each? All rights reserved. n. A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of … This colorless solid is an important industrial chemical, especially for the large–scale production of plasticizers for plastics. PHTHALIC ANHYDRIDE reacts exothermically with water. phthalic anhydride: 1 n a white cyclic anhydride Type of: anhydride a compound formed from one or more other compounds in a reaction resulting in removal of water (organic compound) The acid anhydride of phthalic acid; manufactured by the oxidation of xylene or naphthalene, widely used in the synthesis of dyes, insecticides, plasticizers and pharmaceuticals. Incompatible with acids, strong oxidizing agents, alcohols, amines, and bases. Phthalimide is the organic compound with the formula C 6 H 4 (CO) 2 NH. Definition: Phthalic acid is an organic compound derived from benzene and used in the manufacture of dyes, perfumes, pharmaceuticals, and synthetic fibers. This white solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. Enrich your vocabulary with the English Definition … Recognised concerns are illustrated with a dark red icon. The Most Surprisingly Serendipitous Words Of The Day. The American Heritage® Science Dictionary Classified under: Nouns denoting substances. “Capital” vs. “Capitol”: Do You Know Where You’re Going? Noun . Meaning of Phthalanhydride medical term. Formula: C. A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of phthaleins and other dyes. The pale yellow crystal of phenolphthalein was first synthesized from phthalic anhydride and phenol in 1871 by Adolf von Baeyer, a German chemist. In 2000, the world wide production volume of phthalic anhydride is estimated to be about 3 232 000 tonnes per year. Hypernyms ("phthalic anhydride" is a kind of...): anhydride (a compound formed from one or more other compounds in a reaction resulting in removal of water) Noun. Anthragallol is synthetically prepared by the condensation of benAoic and gallic acids with sulphuric acid OH i [[Cooh + I 10h - 2h20+ Hooc /Oh]] or from pyrogallol and phthalic anhydride in the presence of sulphuric acid or zinc chloride. : a crystalline cyclic acid anhydride C8H4O3 used especially in making alkyd resins. Phthalic is contained in 2 matches in Merriam-Webster Dictionary. ‘The company's phthalic anhydride plant at Raichur, Karnataka and maleic anhydride plant at Taloja, Maharashtra operated satisfactorily during 2002-03.’ ‘Water-soluble compounds derived from homopolymer or copolymer of maleic anhydride, and applications of the said compounds to supporting biological molecules’ Describe 2020 In Just One Word? Phthalic anhydride can … What Is An Em Dash And How Do You Use It? A white crystalline compound, C 8 H 4 C 3, the anhydride of phthalic acid, used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. Compare Products: Select up to 4 products. Phthalic anhydride is an important starting product in the manufacture of various phthalic-acid derivatives, including esters, phthalimide, and phthalonitrile. If your language skills aren’t already top-notch, then this vocab quiz can get you up to speed! What Does Amen Mean At The End Of A Prayer? acid anhydride (plural acid anhydrides) ( organic chemistry ) A class of organic compounds having two acyl groups bonded to the same oxygen atom . A bicyclic anhydride; chemical formula: C₆H₄ (CO)₂O ‘In one method, naphthalene is oxidized with vanadium pentoxide to give phthalic anhydride.’ Chemical formula: C … • PHTHALIC ANHYDRIDE (noun) Sense 1. Phthalanhydride explanation free. All Rights Reserved. Published by Houghton Mifflin Company. Looking for online definition of Phthalanhydride in the Medical Dictionary? A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. Phthalic anhydride is the organic compound with the formula C 6 H 4 (CO) 2 O. Definition of Phthalic anhydride. can also be synthesized by heating catechol with phthalic anhydride and sulphuric acid at 150 C. ' 'C 6 H4>Cg>O+C 6 H4(OH)2[1.2] = H 2 0 -}-C6H4C6H2(OH)2. Definition of phthalic anhydride. phthalic anhydride n. A white crystalline compound, C8H4C3, the anhydride of phthalic acid, used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012. It is a cyclic dicarboxylic anhydride and a member of 2-benzofurans. Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. It was the first anhydride of a dicarboxylic acid to be used commercially. phthalic anhydride A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. Learn definitions, uses, and phrases with phthalic. ... phthalic anhydride. How to say phthalic anhydride in English? Dimethyl-meta-aminophenol crystallizes in small prisms which melt at 87° C. It condenses with phthalic anhydride to form rhodamine, and with succinic anhydride to rhodamine S. A notable example is provided by the phthaleins, which result by the condensation of phthalic anhydride with phenols. Phthalic anhydride is an organic compound, the anhydride of phthalic acid. phthalic anhydride: n. A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of phthaleins and other dyes. Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021, Collins English Dictionary - Complete & Unabridged 2012 Digital Edition phthalic anhydride. anhydride definition in English dictionary, anhydride meaning, synonyms, see also 'acetic anhydride',acid anhydride',acyl anhydride',phthalic anhydride'. Phthalic anhydride is a white colored organic crystalline compound with the chemical formula C 6 H 4 (CO) 2 O that is formed due to the oxidization of naphthalene. Phthalic definition, of or derived from phthalic acid. Pronunciation of phthalic anhydride with 1 audio pronunciation, 1 synonym, 1 meaning, 11 translations and more for phthalic anhydride. the act of a person who encloses something in or as if in a casing or covering, a school giving instruction in one or more of the fine or dramatic arts, a comic character, usually masked, dressed in multicolored, diamond-patterned tights, and carrying a wooden sword or magic wand, Dictionary.com Unabridged Meaning: A white cyclic anhydride. phthalic anhydride. 1. It is the imide derivative of phthalic anhydride.It is a sublimable white solid that is slightly soluble in water but more so upon addition of base.It is used as a precursor to other organic compounds as a masked source of ammonia. What is Phthalanhydride? Go To: Top, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), UV/Visible spectrum, References, Notes Data compilation copyrightby the U.S. Secretary of Commerce on behalf of the U.S.A.All rights reserved. ... Phthalic anhydride . Sources for these are either a Harmonised C&L (CLP Regulation Annex VI) or in the Candidate list of substances of very high concern for authorisation (REACH). a white, crystalline, slightly water-soluble solid, C, a white crystalline substance used mainly in producing dyestuffs. Phthalic anhydride is a white (lustrous needles) solid that is slightly soluble in water. “Affect” vs. “Effect”: Use The Correct Word Every Time. Copyright © 2011. The Dictionary.com Word Of The Year For 2020 Is …. It is an important industrial chemical used in the production of plasticizers, dyestuffs, and pharmaceuticals. Copyright © 2020 LoveToKnow. It has a role as an allergen. n. A white crystalline compound, C 8 H 4 C 3, the anhydride of phthalic acid, used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. Data compiled as indicated in comments: ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein DH- Eugene S. Domalski and Elizabeth D. Hearing © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins It is the anhydride of phthalic acid.This colourless solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. A crystalline compound made by oxidizing naphthalene, used as an intermediate in the manufacture of plastics, resins, and dyes. American Heritage® Dictionary of the English Language, Fifth Edition. Phthalic anhydride (PA) is the dominant saturated dibasic acid used in the manufacture of polyesters. *Please select more than one item to compare Why Do “Left” And “Right” Mean Liberal And Conservative? phthalic anhydride (uncountable) (organic chemistry) The acid anhydride of phthalic acid; manufactured by the oxidation of xylene or naphthalene, widely used in the synthesis of dyes, insecticides, plasticizers and pharmaceuticals. It is presently obtained by catalytic oxidation of ortho–xylene or naphthalene. This compound is classified as an odorless and tasteless mild organic acid; inhaling this substance may cause sneezing and coughing. We Asked, You Answered. Wikipedia . (7) The chemical formula for phthalic anhydride is CH O , and it has a molecular weight of 148.12 g/mol. Acids accelerate the reaction with water. 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Synthesized from phthalic anhydride with phenols is used to obtain dyes, as... With acids, strong oxidizing agents, alcohols, amines, and it has a molecular of. Violent when local heating accelerates their rate by Adolf von Baeyer, a white crystalline substance used mainly in dyestuffs! Odor threshold of 0.053 parts per million ( ppm ) obtained by catalytic oxidation of ortho–xylene naphthalene! Member of 2-benzofurans obtained orthobenzoyl benzoic acid by heating phthalic anhydride with is... Copyright © 2002, 2001, 1995 by Houghton Mifflin Company of the Language! ) obtained orthobenzoyl benzoic acid by heating phthalic anhydride is the anhydride of phthalic anhydride benzene! “ Capitol phthalic anhydride meaning: Use the Correct Word Every Time Mean Liberal and Conservative organic chemistry ) acid... By oxidizing naphthalene and used in the production of plasticizers for plastics for the large–scale production of plasticizers,,! Phenolphthalein was first synthesized from phthalic acid & Compounds ) a white substance! Dicarboxylic anhydride and phenol in 1871 by Adolf von Baeyer, a white crystalline substance used mainly in producing..

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