Phthalic anhydride is the cyclic dicarboxylic anhydride that is the anhydride of phthalic acid. The molecular formula identifies each type of element by its chemical symbol and identifies the number of atoms of each element found in one discrete molecule of the substance. Disposal. Similarly, varying phthalic anhydride/ethylenediamine ratios had no significant Type: Phthalic Anhydride. : TWA 12 mg/m 3 (2 ppm). Molecular Mass 148.11. ; Durant, J.L. Empirical formula: С 8 H 4 O 3. It has a role as an allergen. • Switch Condensers Synonym: 4,4′-Carbonyldiphthalic anhydride Empirical Formula (Hill Notation): C 17 H 6 O 7. Phthalic anhydride is a principal commercial form of phthalic acid. 1,3-Isobenzofurandione, 4-nitro-. The cyclic dicarboxylic anhydride that is the anhydride of phthalic acid. Air concentrations of 25 mg/m3 (4 ppm) produced signs of mucous membrane irritation. • Catalyst packed bed reactor The most probable human exposure to phthalic anhydride is through skin contact or inhalation during manufacture or use. 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. 4-nitroisobenzofuran-1,3-dione. CopyCopied, Validated by Experts, Validated by Users, Non-Validated, Removed by Users, Predicted data is generated using the ACD/Labs Percepta Platform - PhysChem Module, Predicted data is generated using the US Environmental Protection Agency’s EPISuite™, Click to predict properties on the Chemicalize site, For medical information relating to Covid-19, please consult the. It is a organic compound and a important chemical raw material. Synonyms. [3] A related ring-opening reaction involves peroxides to give the useful peroxy acid:[4], Phthalic anhydride is used to dehydrate short-chain nitro-alcohols to yield nitroalkenes, compounds with a high tendency to polymerize. Phthalates are endocrine disruptors. Phthalic anhydride and maleic anhydride are recovered by distillation. 1,2-Benzenedicarboxylic anhydride, PAN, Phthalic acid anhydride White solid (flake) or a clear, colorless, mobile liquid (molten) with a characteristic, acrid odor. Chemical name (on IUPAC): 1,3-Dihydro-2-benzofuran-1,3-dione. Chemsrc provides Phthalic anhydride(CAS#:85-44-9) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. This page was last edited on 15 December 2014, at 19:56. It is an isomer of isophthalic acid and terephthalic acid. Download the identifier in a file. This reaction is a series of electrophilic aromatic substitutions, with hydroxyl leaving groups picking up protons by Lewis acid catalysis. [7] Phthalic anhydride is a degradation product of CAP.[8]. John Wiley & Sons, Inc. 2005]. 4-Nitro-2-benzofuran-1,3-dione. {{#invoke:citation/CS1|citation It was the first anhydride of a dicarboxylic acid to be used commercially. 85-44-9 EINECS-No. Phthalic anhydride is the organic compound with the formula C 6 H 4 (CO) 2 O. TCC’s phthalic anhydride is a toxic, white crystalline compound used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. 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. Phthalic andhydride sublimes on condensation, so after condensation a hot fluid is used to melt phthalic anhydride and simultaneously another condenser in series is used for desired condensation process, switching the condenser back and forth. It is slightly soluble in hot water, hydrolysing to PA, and is soluble in alcohol and carbon disulphide. Molecular Weight: 322.23. Exposure to phthalic anhydride may occur during its use as a chemical intermediate in the plastics industry. Phthalic anhydride is a principal commercial form of phthalic acid. Phthalic anhydride was first reported in 1836 by Auguste Laurent. Appearance: Powder. 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 dyes (anthraquinone, phthalein, rhodamine, phthalocyanine, fluorescin, and xanthene dyes); insect repellents; and polyester polyols for polyurethanes. Principle: Here a modified Friedel-crafts acylation reaction is occurring. Sci. CAS Number: 2421-28-5 It increases the electrophilicity of pthalic anhydride in the first step, and facilitates the elimination of the hydroxyl groups. CAS Number: 2421-28-5 [5], Phthalic anhydride is widely used in industry for the production of certain dyes. Quantification of mutagenes and other organic compounds., Environ. The reactant stream of o-xylene and air mixture enters the packed bed reactor at a temperature of 300-420 ⁰C and a pressure slightly less than 1 atm. White solid (flake) or a clear, colorless, mobile liquid (molten) with a characteristic, acrid odor. Phthalic anhydride. Phthalic anhydride is a precursor to a variety of reagents useful in organic synthesis. c1ccc2c(c1)C(=O)OC2=O White lustrous needles or flakes, free flowing, and free from dirt and other impurities. Phthalic anhydride would exceptionally of plasticiziers for plastics but also for colours, synthetic resin and on wood as surface coating inserted. Can be neutralized with … Properties. phthalic anhydride/ethylenediamine molar ratio of 1:1 gave the highest yield of product I. : 85-44-9. Phthalic acid is however easily dehydrated to form phthalic anhydride above 180 °C, phthalic anhydride re-forms. Acid anhydrides are also used as plasticizers for PVC and other plastics, especially where temperature stability is required, as for example in coatings for wires and cables. Synonym: 4,4′-Carbonyldiphthalic anhydride Empirical formula: С 8 H 4 ( CO ) 2O anhydride may during... Function as plasticizers, are derived from phthalic anhydride is made primarily by gas‐phase oxidation of ‐xylene... Versatile intermediate in the production of plasticizers for plastics derived from phthalic anhydride is CH,! Cuo at elevated temperatures [ Park, Chang-Man, Richard J. Sheehan temperatures... It was the first anhydride of a dicarboxylic acid to be used.! First step, and asthma separation in switch condenser ) the chemical formula phthalic. Cass, G.R., Human cell mutagenes in respirable airborne particles from the United. 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