It is presently obtained by catalytic oxidation of ortho–xylene or naphthalene. They react with water to give carboxylic acids . All Rights Reserved. a white, crystalline, slightly water-soluble solid, C, a white crystalline substance used mainly in producing dyestuffs. Definition of Phthalic anhydride. The pale yellow crystal of phenolphthalein was first synthesized from phthalic anhydride and phenol in 1871 by Adolf von Baeyer, a German chemist. How to say phthalic anhydride in English? The condensation of phthalic anhydride with phenols is used to obtain dyes, such as phenolphthalein. “That” vs. “Which”: When Do You Use Each? 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 phthalic anhydride A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. Why Do “Left” And “Right” Mean Liberal And Conservative? PHTHALIC ANHYDRIDE reacts exothermically with water. Phthalic anhydride is an organic compound, the anhydride of phthalic acid. Learn definitions, uses, and phrases with phthalic. See more. Pronunciation of phthalic anhydride with 1 audio pronunciation, 1 synonym, 1 meaning, 11 translations and more for phthalic anhydride. *Please select more than one item to compare The American Heritage® Stedman's Medical Dictionary The Dictionary.com Word Of The Year For 2020 Is …. Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021, Collins English Dictionary - Complete & Unabridged 2012 Digital Edition It is an important industrial chemical used in the production of plasticizers, dyestuffs, and pharmaceuticals. Phthalanhydride explanation free. 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. (7) The chemical formula for phthalic anhydride is CH O , and it has a molecular weight of 148.12 g/mol. Recognised concerns are illustrated with a dark red icon. anhydride definition in English dictionary, anhydride meaning, synonyms, see also 'acetic anhydride',acid anhydride',acyl anhydride',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. A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. Chemical formula: C … In 2000, the world wide production volume of phthalic anhydride is estimated to be about 3 232 000 tonnes per year. phthalic anhydride: n. A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of phthaleins and other dyes. phthalic anhydride n (Elements & Compounds) a white crystalline substance used mainly in producing dyestuffs. What Does Amen Mean At The End Of A Prayer? A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. It is a cyclic dicarboxylic anhydride and a member of 2-benzofurans. phthalic anhydride. 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. This compound is classified as an odorless and tasteless mild organic acid; inhaling this substance may cause sneezing and coughing. 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. Phthalimide is the organic compound with the formula C 6 H 4 (CO) 2 NH. n. A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of … Published by Houghton Mifflin Harcourt Publishing Company. Phthalic anhydride can … Classified under: Nouns denoting substances. Copyright © 2011. 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. Phthalic anhydride is the cyclic dicarboxylic anhydride that is the anhydride of phthalic acid. A bicyclic anhydride; chemical formula: C₆H₄ (CO)₂O ‘In one method, naphthalene is oxidized with vanadium pentoxide to give phthalic anhydride.’ 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) The Most Surprisingly Serendipitous Words Of The Day. Describe 2020 In Just One Word? 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 Copyright © 2020 LoveToKnow. ... Phthalic anhydride . "Recognised" - meaning that the concern is indicated in an official source. (6,8) Phthalic anhydride has an odor threshold of 0.053 parts per million (ppm). We Asked, You Answered. THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION … Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012. Phthalic anhydride is a principal commercial form of phthalic acid. Structure, properties, spectra, suppliers and links for: Phthalic anhydride, 85-44-9. 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. Search results for phthalic anhydride at Sigma-Aldrich. • PHTHALIC ANHYDRIDE (noun) Sense 1. Phthalic anhydride definition: white crystalline substance used mainly in producing dyestuffs | Meaning, pronunciation, translations and examples Published by Houghton Mifflin Company. American Heritage® Dictionary of the English Language, Fifth Edition. Dorp (Ber.,1874,7,P.578) obtained orthobenzoyl benzoic acid by heating phthalic anhydride with benzene in the presence of aluminium chloride. Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. It was the first anhydride of a dicarboxylic acid to be used commercially. Meaning: A white cyclic anhydride. ‘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’ phthalic anhydride. © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Phthalic anhydride is the anhydride of phthalic acid. Phthalic anhydride is a white (lustrous needles) solid that is slightly soluble in water. Definition of phthalic anhydride. ¹ Compare Products: Select up to 4 products. 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. This white solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. Noun. 1. ... phthalic anhydride. Meaning of Phthalanhydride medical term. Phthalic anhydride (PA) is the dominant saturated dibasic acid used in the manufacture of polyesters. 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. Wikipedia . 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. Acids accelerate the reaction with water. It reacts exothermically when in contact with water and as such can accelerate … All rights reserved. Phthalic definition, of or derived from phthalic acid. : a crystalline cyclic acid anhydride C8H4O3 used especially in making alkyd resins. “Capital” vs. “Capitol”: Do You Know Where You’re Going? Formula: C. A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of phthaleins and other dyes. A crystalline compound made by oxidizing naphthalene, used as an intermediate in the manufacture of plastics, resins, and dyes. 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. 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. What Is An Em Dash And How Do You Use It? Phthalic anhydride is an important starting product in the manufacture of various phthalic-acid derivatives, including esters, phthalimide, and phthalonitrile. (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. Looking for online definition of Phthalanhydride in the Medical Dictionary? 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 Incompatible with acids, strong oxidizing agents, alcohols, amines, and bases. If your language skills aren’t already top-notch, then this vocab quiz can get you up to speed! What is Phthalanhydride? (organic chemistry) The acid anhydride of phthalic acid. Phthalic is contained in 2 matches in Merriam-Webster Dictionary. 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. 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). Exposure to phthalic anhydride may occur during its use as a chemical intermediate in the plastics industry. The reactions are sometimes slow, but can become violent when local heating accelerates their rate. “Affect” vs. “Effect”: Use The Correct Word Every Time. It has a role as an allergen. Definition: Phthalic acid is an organic compound derived from benzene and used in the manufacture of dyes, perfumes, pharmaceuticals, and synthetic fibers. 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