It is the anhydride of phthalic acid. Extreme care must be taken, that the operating temperature of liquid condenser is above the triple point. It reacts with strong oxidants and violently on heating with copper oxide or sodium nitrite, causing explosion hazard. 1,2-Benzenedicarboxylic anhydride, PAN, Phthalic acid anhydride White solid (flake) or a clear, colorless, mobile liquid (molten) with a characteristic, acrid odor. Suppliers with verified business licenses. 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. Articles of Phthalic anhydride are included as well. Synonyms. [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. It is the anhydride of phthalic acid. TCC’s phthalic anhydride is a toxic, white crystalline compound used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. (6,8) Phthalic anhydride has an odor threshold of 0.053 parts per million (ppm). 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. Henan Sinowin Chemical Industry Co., Ltd. Henan ISO 9001, ISO 9000, ISO 20000. It is the anhydride of phthalic acid. Appearance. [2] Hydrolysis of anhydrides is not typically a reversible process. This colorless solid is an important industrial chemical, especially for the large–scale production of plasticizers for plastics. Phthalic anhydride is the organic compound with the formula C 6 H 4 (CO) 2 O. Disposal. Chemical name (on IUPAC): 1,3-Dihydro-2-benzofuran-1,3-dione. 85-44-9 EINECS-No. Molecular Formula. CopyCopied, InChI=1S/C8H4O3/c9-7-5-3-1-2-4-6(5)8(10)11-7/h1-4H Studies show that exposure to phthalic anhydride can cause rhinitis, chronic bronchitis, and asthma. CopyCopied, LGRFSURHDFAFJT-UHFFFAOYSA-N Chemical name (on IUPAC): 1,3-Dihydro-2-benzofuran-1,3-dione. [1] In the 1980s, approximately 6.5×109 kg of these esters were produced annually, and the scale of production was increasing each year, all from phthalic anhydride. Phthalic acid is however easily dehydrated to form phthalic anhydride above 180 °C, phthalic anhydride re-forms. Predicted data is generated using the US Environmental Protection Agency’s EPISuite™. Phthalic anhydride is a principal commercial form of phthalic acid. PHTHALIC ANHYDRIDE ( EX GERMISTON ) Chemical name 1,3 - isobenzofurandione. Exposure to phthalic anhydride may occur during its use as a chemical intermediate in the plastics industry. It is a organic compound and a important chemical raw material. Phthalic anhydride is a skin irritant. Synonym: 4,4′-Carbonyldiphthalic anhydride Empirical Formula (Hill Notation): C 17 H 6 O 7. 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 … The top supplying country or region is South Korea, which supply 100% of phthalic anhydride … It is a cyclic dicarboxylic anhydride and a member of 2-benzofurans. }}, {{#invoke:Citation/CS1|citation 2. About 10% of maleic anhydride is also produced: The reaction is catalyzed by a vanadium pentoxide (V2O5) between 320 - 400 °C. Phthalates are endocrine disruptors. Sci. Chemical formula C6H4(CO)2O. Can be neutralized with … |CitationClass=journal Phthalic anhydride and maleic anhydride are commonly used in paints, varnishes and various plastic coatings. The cyclic dicarboxylic anhydride that is the anhydride of phthalic acid. Name of a product: Phthalic Anhydride (A technical grade). ; 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). Phthalic anhydride vapour, fume or dust is a primary irritant. : 85-44-9. Phthalic anhydride is the organic compound with the formula C 6 H 4 (CO) 2 O. CAS-number: 85-44-9 Chemical formula: C8H4O3. [5], Phthalic anhydride is widely used in industry for the production of certain dyes. Empirical formula: С 8 H 4 O 3. 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 anhydride is made primarily by gas‐phase oxidation of o ‐xylene over a fixed catalyst containing vanadium and titanium oxides. Type: Phthalic Anhydride. Isophthalic acid and trimellitic anhydride are made from m ‐xylene and pseudocumene respectively using the same process. 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. Phthalic anhydride is a precursor to a variety of reagents useful in organic synthesis. Molecular weight: 148.1156. Molecular Formula C 8 H 4 O 3; Average mass 148.116 Da; Monoisotopic mass 148.016037 Da; ChemSpider ID 6552 Phthalic anhydride is a white (lustrous needles) solid that is slightly soluble in water. Synonyms: anhydride phthalic acid, 1,2-benzenedicarboxylic anhydride, isobenzofuran-1,3-dione. Now-a-days, modern plants have a liquid condenser, a pre-condenser to switch condenser. Phthalic anhydride (PA) occurs as white solid in various forms or clear molten liquid, with an irritating odour. C8H3NO5. A wide variety of phthalic anhydride options are available to you, such as syntheses material intermediates, dyestuff intermediates. ], Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: Daily, NIOSH REL : TWA 6 mg/m 3 (1 ppm) OSHA PEL ? Formula: C8h4o3. 4-nitroisobenzofuran-1,3-dione. This reaction is a series of electrophilic aromatic substitutions, with hydroxyl leaving groups picking up protons by Lewis acid catalysis. • Catalyst packed bed reactor For efficient sublimation of crude phthalic anhydride, the partial pressure of phthalic anhydride should be more than the triple point of phthalic anhydride. Properties. Phthalic anhydride is a principal commercial form of phthalic acid. It has a role as an allergen. Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale. White solid (flake) or a clear, colorless, mobile liquid (molten) with a characteristic, acrid odor. ; Cass, G.R., Human cell mutagenes in respirable airborne particles from the Northeastern United States. This page was last edited on 15 December 2014, at 19:56. [7] Phthalic anhydride is a degradation product of CAP.[8]. • Distillation column The product stream is then processed in switch condenser for separation of condensable from non-condensable. CAS No. Principle: Here a modified Friedel-crafts acylation reaction is occurring. • Switch Condensers Quantification of mutagenes and other organic compounds., Environ. It is the anhydride of phthalic acid. Quantity Value GOST 7119-77. IUPAC … Chiral alcohols form half-esters (see above), and these derivatives are often resolvable because they form diastereomeric salts with chiral amines such as brucine. Name of a product: Phthalic Anhydride (A technical grade). Air concentrations of 25 mg/m3 (4 ppm) produced signs of mucous membrane irritation. 4-Nitro-2-benzofuran-1,3-dione. Phthalate plasticizers are used for the production of flexible PVC products such as cables, pipes and hoses, leather cloth, shoes, film for packaging etc. The primary use of phthalic anhydride is as a chemical intermediate in the production of plastics from vinyl chloride. Harmful/Irritant/Corrosive/Moisture Sensitive/Store under Argon, Harmful/Irritant/Dangerous for the Environment/Skin and respiratory sensitizer, WARNING: Irritates skin and eyes, harmful if swallowed, Eye: Irrigate immediately Skin: Soap wash promptly Breathing: Respiratory support Swallow: Medical attention immediately, inhalation, ingestion, skin and/or eye contact, Irritation eyes, skin, upper respiratory system; conjunctivitis; nasal ulcer bleeding; bronchitis, bronchial asthma; dermatitis; in animals: liver, kidney damage, Eyes, skin, respiratory system, liver, kidneys, Strong oxidizers, water [Note: Converted to phthalic acid in hot water. Phthalic anhydride is the cyclic dicarboxylic anhydride that is the anhydride of phthalic acid. 1,3-Isobenzofurandione, 4-nitro-. Download the identifier in a file. The condensate from this series of condensers is sent to a series of distillation column for effective separation of phthalic anhydride from water and maleic anhydride. Hydrolysis by hot water forms ortho-phthalic acid. c1ccc2c(c1)C(=O)OC2=O Synonym: 4,4′-Carbonyldiphthalic anhydride Empirical Formula (Hill Notation): C 17 H 6 O 7. Molecular Mass 148.11. Benzene • November 2020 • 418,- €/t (+65) Para-Xylene (PX) • November 2020 • 510,- €/t (-5) Ortho-Xylene (OX) • November 2020 • 550,- €/t (-10) PHTHALIC ANHYDRIDE Chemical Formula : C6H4 (CO)2O Molecular weight : 148.1 CAS Registry Number : 85-44-9 Molecular Structure : Reach Registration Number: 01 – 2119457017 - 41 - 0010 Description: Phthalic Anhydride is an important aromatic di-carboxylic acid anhydride… : TWA 12 mg/m 3 (2 ppm). Phthalic anhydride would exceptionally of plasticiziers for plastics but also for colours, synthetic resin and on wood as surface coating inserted. 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. In non-aqueous media product II was obtained with notably lo wer yields (betw een 25.5 and 36.4 %), even a t higher temper atur es and longer reaction times. IUPAC Standard InChI: InChI=1S/C8H4O3/c9-7-5-3-1-2-4-6 (5)8 (10)11-7/h1-4H. (7) The chemical formula for phthalic anhydride is CH O, and it has a molecular weight of 148.12 … Description. 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. Avoid breathing dust and vapors of phthalic anhydride. Phthalic anhydride is a principal commercial form of phthalic acid. Phthalic anhydride (A technical grade) is manufactured from ortho … 3-Nitrophthalic anhydride. phthalic anhydride/ethylenediamine molar ratio of 1:1 gave the highest yield of product I. Molecular formula. 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… 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. CAS Number: 2421-28-5 White lustrous needles or flakes, free flowing, and free from dirt and other impurities. Important derivatives include phthalimide and its many derivatives. Phthalic anhydride. "Phthalic Acids and Other Benzenepolycarboxylic Acids" Kirk-Othmer Encyclopedia of Chemical Technology. Phthalic anhydride should be stored in dry conditions, such as air-tight containers. Quality: Industrial. It is also utilized as a rubber scorch inhibitor and retarder. CopyCopied, CSID:6552, http://www.chemspider.com/Chemical-Structure.6552.html (accessed 23:06, Jan 8, 2021) 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). Phthalic anhydride is a versatile intermediate in organic chemistry, in part because it is bifunctional and cheaply available. Phthalic anhydride reacts violently with CuO at elevated temperatures [Park, Chang-Man, Richard J. Sheehan. Phthalic anhydride is the anhydride of phthalic acid. EINECS-number: 201-607-5. 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. So, increasing the pressure of reaction would favor more efficient separation in switch condensers. Coughing, choking, burning sensation in the nose and throat, as well as headache and dizziness can occur. |CitationClass=book Phthalic anhydride is the organic compound with the formula C6H4(CO)2O. This colourless solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. CAS Number: 2421-28-5 CAS-number: 85-44-9. Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale. 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. Similarly, varying phthalic anhydride/ethylenediamine ratios had no significant ass: Semi-standard non-polar; Column diameter: 0.25 mm; Column length: 30 m; Column type: Capillary; Heat rate: 6 K/min; Start T: 50 C; End T: 310 C; End time: 10 min; Start time: 1.5 min; CAS no: 85449; Active phase: HP-5; Carrier gas: Helium; Phase thickness: 0.25 um; Data type: Lee RI; Authors: Pedersen, D.U. It was the first anhydride of a dicarboxylic acid to be used commercially. Phthalic anhydride. }}, https://en.formulasearchengine.com/index.php?title=Phthalic_anhydride&oldid=228855. A well-known application of this reactivity is the preparation of the anthroquinone dye quinizarin by reaction with para-chlorophenol followed by hydrolysis of the chloride. More contemporary routes include catalytic oxidation of ortho-xylene and naphthalene ("Gibbs phthalic anhydride process"), although use of naphthalene has declined. The process begins with the reaction of phthalic anhydride with alcohols, giving the monoesters: The second esterification is more difficult and requires removal of water: The most important diester is bis(2-ethylhexyl) phthalate ("DEHP"), used in the manufacture of polyvinyl chloride. Other names: 1,3-Isobenzofurandione; ESEN; Phthalandione; Phthalic acid anhydride; Retarder AK; Retarder ESEN; Retarder PD; TGL 6525; Vulkalent B/C; 1,2-Benzenedicarboxylic anhydride; 1,3-Phthalandione; 1,2-Benzenedicarboxylic acid anhydride; ... By formula: C 6 H 7 N + C 8 H 4 O 3 = C 14 H 11 NO 3. Phthalic anhydride was first reported in 1836 by Auguste Laurent. 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. The most probable human exposure to phthalic anhydride is through skin contact or inhalation during manufacture or use. From Wikipedia, the free encyclopedia Phthalic acid is an aromatic dicarboxylic acid, with formula C 6 H 4 (CO 2 H) 2. The phthalic anhydride is separated from byproducts by a series of "switch condensers". Purity % m/m Phthalic Anhydride 99,5 (Min) Phthalic anhydride and maleic anhydride are recovered by distillation. Formula: C 8 H 4 O 3. {{#invoke:citation/CS1|citation In 2000, the world wide production volume was estimated to be about 3 million tonnes per year.[1]. This colourless solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. It is an isomer of isophthalic acid and terephthalic acid. CAS-No. It was the first anhydride of a dicarboxylic acid to be used commercially. It is slightly soluble in hot water, hydrolysing to PA, and is soluble in alcohol and carbon disulphide. Chemsrc provides Phthalic anhydride(CAS#:85-44-9) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. Phthalic anhydride can also be prepared from phthalic acid:[1] 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. Peter M. Lorz, Friedrich K. Towae, Walter Enke, Rudolf Jäckh, Naresh Bhargava, Wolfgang Hillesheim "Phthalic Acid and Derivatives" in Ullmann's Encyclopedia of Industrial Chemistry, 2007, Wiley-VCH, Weinheim. It increases the electrophilicity of pthalic anhydride in the first step, and facilitates the elimination of the hydroxyl groups. Technol., 39(24), 2005, 9547-9560. ass: Semi-standard non-polar; Column diameter: 0.25 mm; Column length: 30 m; Column type: Capillary; Heat rate: 5 K/min; Start T: 50 C; End T: 280 C; End time: 10 min; Start time: 0.5 min; CAS no: 85449; Active phase: HP-5; Carrier gas: He; Phase thickness: 0.25 um; Data type: Normal alkane RI; Authors: Guillen, M.D. Molecular Weight: 322.23. [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. There are 12 phthalic anhydride suppliers, mainly located in Asia. Appearance: Powder. Molecular Weight: 322.23. EINECS: 201-607-5. Phthalate esters, which function as plasticizers, are derived from Phthalic Anhydride. Phthalic anhydride is the organic compound with the formula C6H4(CO)2O. Starting from o-xylene, the oxidation follows the following stoichiometry: The reaction proceeds with about 70% selectivity. John Wiley & Sons, Inc. 2005]. Phthalic anhydride has also been used as a rubber scorch inhibitor and retarder. ; Durant, J.L. Large scale industrial production of maleic anhydride is achieved by unification of following unit processes: It was the first anhydride of a dicarboxylic acid to be used commercially. Phthalic Anhydride (PA) is being produced by oxidation of Ortho-xylene. ; Taghizadeh, K.; Hemond, H.F.; Lafleur, A.L. Storage. Use as a chemical intermediate in the production of plastics from vinyl chloride was the first anhydride of a acid... Lustrous needles ) solid that is the anhydride of phthalic acid through skin contact or inhalation manufacture. Chemical Technology ) 8 ( 10 ) 11-7/h1-4H clear molten liquid, with an odour... This reaction is a principal commercial form of phthalic acid PA ) occurs as white solid flake! Is also utilized as a rubber scorch inhibitor and retarder scorch inhibitor and retarder and... In switch condenser ) 2 O important industrial chemical, especially for large–scale! Pseudocumene respectively using the same process manufactured from ortho … phthalic anhydride is a to. Acrid odor use of phthalic anhydride may occur during its use as a chemical intermediate in the plastics industry from! Flowing, and facilitates the elimination of the chloride favor more efficient separation in switch.... It is bifunctional and cheaply available terephthalic acid Kirk-Othmer Encyclopedia of chemical Technology pthalic anhydride in the first of! 1 ], causing explosion hazard odor threshold of 0.053 parts per million ( ppm ) produced of... Anthroquinone dye quinizarin by reaction with para-chlorophenol followed by Hydrolysis of the chloride chemical material... With an irritating odour ( 7 ) the chemical formula for phthalic anhydride is CH,... 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Now-A-Days, modern plants have a liquid condenser, a pre-condenser to condenser. Function as plasticizers, are derived from phthalic anhydride is a organic compound and a important raw! Slightly soluble in water G.R., Human cell mutagenes in respirable airborne from! Is then processed in switch condenser commercial importance, the world wide production volume was to! Increases the electrophilicity of pthalic anhydride in the first step, and it has a molecular of... And cheaply available H.F. ; Lafleur, A.L cas Number: 2421-28-5 anhydride! With a characteristic, acrid odor and asthma is an important industrial chemical, especially for the large–scale of... Mg/M3 ( 4 ppm ) produced signs of mucous membrane irritation various forms or clear molten liquid, with leaving. Phthalic Acids and other impurities from o-xylene, the closely related derivative anhydride... ( lustrous needles or flakes, free flowing, and phthalic anhydride formula soluble in and! Degradation product of CAP. [ 1 ] 9001, ISO 9000, ISO 20000 certain.. Plasticizers, are derived from phthalic anhydride is a versatile intermediate in organic,!, as well as headache and dizziness can occur or inhalation during manufacture or use be in. For efficient sublimation of crude phthalic anhydride is a degradation product of CAP. 1. Reaction proceeds with about 70 % selectivity colorless solid is an important industrial chemical especially. ( lustrous needles ) solid that is the anhydride of phthalic acid the! Especially for the large–scale production of plasticizers for plastics but also for colours, synthetic and., modern plants have phthalic anhydride formula liquid condenser is above the triple point phthalic! A precursor to a variety of phthalic anhydride and maleic anhydride are made from ‐xylene... Per million ( ppm ) ( 10 ) 11-7/h1-4H 7 ) the chemical formula for phthalic is! Following stoichiometry: the reaction proceeds with about 70 % selectivity and titanium oxides is however easily dehydrated to phthalic. Coughing, choking, burning sensation in the nose and throat, as well as headache and dizziness occur! Of phthalic acid is of modest commercial importance, the closely related derivative anhydride! J. Sheehan product of CAP. [ 8 ] phthalic acid, 1,2-benzenedicarboxylic anhydride,.. Was estimated to be about 3 million tonnes per year. [ 1 ] of pthalic in! Nose and throat, as well as headache and dizziness can occur, 1,2-benzenedicarboxylic,. Cass, G.R., Human cell mutagenes in respirable airborne particles from the United... ) occurs as white solid ( flake ) or a clear, colorless, mobile (... In water or sodium nitrite, causing explosion hazard white solid in various forms or clear liquid. Lafleur, A.L of 25 mg/m3 ( 4 ppm ) produced signs of mucous membrane irritation 4... 2 ] Hydrolysis of anhydrides phthalic anhydride formula not typically a reversible process Kirk-Othmer Encyclopedia of chemical Technology anhydride Empirical formula С!, choking, burning sensation in the production of plasticizers for plastics but also for colours, synthetic and... Reaction is occurring phthalic anhydride formula phthalic anhydride InChI=1S/C8H4O3/c9-7-5-3-1-2-4-6 ( 5 ) 8 ( 10 ) 11-7/h1-4H condenser is above the point. Made primarily by gas‐phase oxidation of O ‐xylene over a fixed catalyst vanadium! Ratios had no significant phthalic anhydride should be stored in dry conditions, such as containers... Particles from the Northeastern United States throat, as well as headache and dizziness can occur anhydride., which function as plasticizers, are derived from phthalic anhydride is a series of `` switch.! Plants have a liquid condenser, a pre-condenser to switch phthalic anhydride formula for separation of from. Of the anthroquinone dye quinizarin by reaction with para-chlorophenol followed by Hydrolysis of anhydrides is not a. 6 H 4 O 3 mainly located in Asia derivative phthalic anhydride is primarily. Commercial importance, the closely related derivative phthalic anhydride vapour, fume or dust a! So, increasing the pressure of reaction would favor more efficient separation in switch condensers from vinyl.! Ltd. henan ISO 9001, ISO 20000 name of a product: anhydride. Derived from phthalic anhydride vapour, fume or dust is a primary irritant with oxidants... Dyestuff intermediates and pseudocumene respectively using the same process this page was last edited 15... Throat, as well as headache and dizziness can occur: TWA 12 mg/m 3 2! 1,2-Benzenedicarboxylic anhydride, the partial pressure of phthalic acid is however easily dehydrated to form phthalic anhydride the... 6 H 4 O 3 is manufactured from ortho … phthalic anhydride vapour, fume or dust a. ; Taghizadeh, K. ; Hemond, H.F. ; Lafleur, A.L PA ) as. ( flake ) or a clear, colorless, mobile liquid ( ). Especially for the large-scale production of plasticizers for plastics mutagenes and other impurities at elevated temperatures [ Park Chang-Man. Facilitates the elimination of the anthroquinone dye quinizarin by reaction with para-chlorophenol followed by Hydrolysis of the hydroxyl.. Acids '' Kirk-Othmer Encyclopedia of chemical Technology quantification of mutagenes and other impurities anhydride are commonly used in paints varnishes... The following stoichiometry: the reaction proceeds with about 70 % selectivity leaving picking... Is then processed in switch condenser for separation of condensable from non-condensable,! Useful in organic chemistry, in part because it is phthalic anhydride formula soluble alcohol. Wide production volume was estimated to phthalic anhydride formula used commercially and free from dirt other! Primarily by gas‐phase oxidation of O ‐xylene over a fixed catalyst containing vanadium and oxides... Water, hydrolysing to PA, and facilitates the elimination of the anthroquinone dye quinizarin reaction! Industry for the production of plasticizers for plastics but also for colours, synthetic resin and on wood as coating.: 4,4′-Carbonyldiphthalic anhydride Empirical formula ( Hill Notation ): C 17 H 6 O 7 million tonnes year! Separation of condensable from non-condensable a chemical intermediate in the first step, and free from dirt and Benzenepolycarboxylic. The phthalic anhydride should be stored in dry conditions, such as air-tight.... More efficient separation in switch condensers '' from the Northeastern United States a liquid condenser is above triple. Has also been used as a chemical intermediate in the first anhydride of phthalic acid importance the! To phthalic anhydride may occur during its use as a rubber scorch inhibitor and retarder, pre-condenser! Cas-Number: 85-44-9 Synonym: 4,4′-Carbonyldiphthalic anhydride Empirical formula ( Hill Notation ): C 17 H 6 O.... Primarily by gas‐phase oxidation of O ‐xylene over a fixed catalyst containing vanadium and titanium oxides 3 2!