Large scale industrial production of maleic anhydride is achieved by unification of following unit processes: Isophthalic acid and trimellitic anhydride are made from m ‐xylene and pseudocumene respectively using the same process. Phthalic anhydride and maleic anhydride are commonly used in paints, varnishes and various plastic coatings. It is the anhydride of phthalic acid. Phthalic anhydride is a principal commercial form of phthalic acid. Empirical formula: С 8 H 4 O 3. "Phthalic Acids and Other Benzenepolycarboxylic Acids" Kirk-Othmer Encyclopedia of Chemical Technology. Phthalic anhydride is a white (lustrous needles) solid that is slightly soluble in water. Chemical formula: C8H4O3. Phthalic anhydride (PA) occurs as white solid in various forms or clear molten liquid, with an irritating odour. Phthalic anhydride is the organic compound with the formula C6H4(CO)2O. It is the anhydride of phthalic acid. phthalic anhydride/ethylenediamine molar ratio of 1:1 gave the highest yield of product I. c1ccc2c(c1)C(=O)OC2=O Phthalic anhydride has another major use in the production of polyester resins and other minor uses in the production of alkyd resins used in paints and lacquers, certain guys, insect repellents, and urethane polyester polyols. Henan Sinowin Chemical Industry Co., Ltd. Henan ISO 9001, ISO 9000, ISO 20000. 4-nitroisobenzofuran-1,3-dione. Starting from o-xylene, the oxidation follows the following stoichiometry: The reaction proceeds with about 70% selectivity. Phthalic anhydride reaction on human health is generally an asthma-rhinitis-conjunctivitis syndrome or a delayed reaction and influenza-like symptoms and with increased Immunoglobulin (Immunoglobulin E, Immunoglobulin G ) levels in the blood. This reaction is a series of electrophilic aromatic substitutions, with hydroxyl leaving groups picking up protons by Lewis acid catalysis. Download the identifier in a file. Phthalic anhydride can also be prepared from phthalic acid:[1] Phthalic anhydride is made primarily by gas‐phase oxidation of o ‐xylene over a fixed catalyst containing vanadium and titanium oxides. It is also utilized as a rubber scorch inhibitor and retarder. Molecular Formula. }}, {{#invoke:Citation/CS1|citation White solid (flake) or a clear, colorless, mobile liquid (molten) with a characteristic, acrid odor. There are 12 phthalic anhydride suppliers, mainly located in Asia. CAS-No. This page was last edited on 15 December 2014, at 19:56. }}, https://en.formulasearchengine.com/index.php?title=Phthalic_anhydride&oldid=228855. Appearance. In 2000, the world wide production volume was estimated to be about 3 million tonnes per year.[1]. CAS-number: 85-44-9 It is the anhydride of phthalic acid. Phthalic anhydride vapour, fume or dust is a primary irritant. ; Durant, J.L. A wide variety of phthalic anhydride options are available to you, such as syntheses material intermediates, dyestuff intermediates. It reacts with strong oxidants and violently on heating with copper oxide or sodium nitrite, causing explosion hazard. It is a cyclic dicarboxylic anhydride and a member of 2-benzofurans. CAS No. Avoid breathing dust and vapors of phthalic anhydride. Phthalic anhydride is a principal commercial form of phthalic acid. It is the anhydride of phthalic acid. Studies show that exposure to phthalic anhydride can cause rhinitis, chronic bronchitis, and asthma. [5], Phthalic anhydride is widely used in industry for the production of certain dyes. |CitationClass=book More contemporary routes include catalytic oxidation of ortho-xylene and naphthalene ("Gibbs phthalic anhydride process"), although use of naphthalene has declined. Quantification of mutagenes and other organic compounds., Environ. : TWA 12 mg/m 3 (2 ppm). Quantity Value Phthalic acid is however easily dehydrated to form phthalic anhydride above 180 °C, phthalic anhydride re-forms. Name of a product: Phthalic Anhydride (A technical grade). Quality: Industrial. Chemical formula C6H4(CO)2O. The major outlet for phthalic anhydride (PA), accounting for just over half of production, is in the manufacture of phthalate plasticisers, the main product being dioctyl phthalate (DOP) which is used as a plasticiser in polyvinyl chloride (PVC). Synonyms: anhydride phthalic acid, 1,2-benzenedicarboxylic anhydride, the world wide production volume was to... Taken, that the operating temperature of liquid condenser is above the point... 4,4′-Carbonyldiphthalic anhydride Empirical formula: С 8 H 4 O 3 hydroxyl leaving groups picking up protons by Lewis catalysis! Skin irritant Hemond, H.F. ; Lafleur, A.L for colours, synthetic and! [ Park, Chang-Man, Richard J. Sheehan surface coating inserted synonyms: anhydride phthalic acid is modest. 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