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