1,2-Benzenedicarboxylic anhydride, PAN, Phthalic acid anhydride White solid (flake) or a clear, colorless, mobile liquid (molten) with a characteristic, acrid odor. Log Octanol-Water Partition Coef (SRC): Log Kow (KOWWIN v1.67 estimate) = 3.30 Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPWIN v1.42): Boiling Pt (deg C): 474.47 (Adapted Stein & Brown method) Melting Pt (deg C): 188.43 (Mean or Weighted MP) VP(mm Hg,25 deg C): 2.35E-009 (Modified Grain … Molecular weight: 148.1156. White lustrous needles or flakes, free flowing, and free from dirt and other impurities. This page was last edited on 15 December 2014, at 19:56. Synonyms. In order to get the form of the molecule shown as the product of the reaction, the pH needs to be increased in order to open the lactone ring.1 Aim:To prepare fluorescein fr… Phthalic anhydride is the cyclic dicarboxylic anhydride that is the anhydride of phthalic acid. White solid (flake) or a clear, colorless, mobile liquid (molten) with a characteristic, acrid odor. [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. Quality: Industrial. The cyclic dicarboxylic anhydride that is the anhydride of phthalic acid. It was the first anhydride of a dicarboxylic acid to be used commercially. Chemical formula C6H4(CO)2O. ; Taghizadeh, K.; Hemond, H.F.; Lafleur, A.L. Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale. 641-70-3. If such information is available in ECHA’s database and is it not claimed confidential, the molecular formula and molecular structure will be displayed here. Avoid breathing dust and vapors of phthalic anhydride. There are 12 phthalic anhydride suppliers, mainly located in Asia. Isophthalic acid and trimellitic anhydride are made from m ‐xylene and pseudocumene respectively using the same process. For efficient sublimation of crude phthalic anhydride, the partial pressure of phthalic anhydride should be more than the triple point of phthalic anhydride. It is also utilized as a rubber scorch inhibitor and retarder. 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. Chemical formula: C8H4O3. So, increasing the pressure of reaction would favor more efficient separation in switch condensers. [2] Hydrolysis of anhydrides is not typically a reversible process. Phthalic anhydride has also been used as a rubber scorch inhibitor and retarder. Phthalic anhydride can also be prepared from phthalic acid:[1] CAS-number: 85-44-9 This colourless solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. Coughing, choking, burning sensation in the nose and throat, as well as headache and dizziness can occur. GOST 7119-77. Phthalic anhydride and maleic anhydride are recovered by distillation. Molecular Formula. 4-nitroisobenzofuran-1,3-dione. }}, {{#invoke:Citation/CS1|citation 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. ; Cass, G.R., Human cell mutagenes in respirable airborne particles from the Northeastern United States. Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale. As with other anhydrides, the alcoholysis reaction is the basis of the manufacture of phthalate esters, which are widely used (and controversial - see endocrine disruptor) plasticizers. "Phthalic Acids and Other Benzenepolycarboxylic Acids" Kirk-Othmer Encyclopedia of Chemical Technology. [5], Phthalic anhydride is widely used in industry for the production of certain dyes. Chemical name (on IUPAC): 1,3-Dihydro-2-benzofuran-1,3-dione. C8H3NO5. 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. [6], Phthalic anhydride treated with cellulose acetate gives cellulose acetate phthalate (CAP), a common enteric coating excipient that has also been shown to have antiviral activity. Phthalic anhydride is the organic compound with the formula C 6 H 4 (CO) 2 O. 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. Download the identifier in a file. ; Manzanos, M.J., Study of the volatile composition of an aqueous oak smoke preparation, Food Chem., 79, 2002, 283-292. https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:36605, ACD/Labs Percepta Platform - PhysChem Module, US Environmental Protection Agency’s EPISuite, Compounds with the same molecular formula, Search Google for structures with same skeleton, 562-564 F / 760 mmHg (294.4444-295.5556 °C / 760 mmHg). Molten ) with a characteristic, acrid odor plants have a liquid condenser above! 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