Phthalic anhydride is a versatile intermediate in organic chemistry, in part because it is bifunctional and cheaply available. 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. Storage. GOST 7119-77. Phthalic anhydride and maleic anhydride are recovered by distillation. 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). Isophthalic acid and trimellitic anhydride are made from m ‐xylene and pseudocumene respectively using the same process. • Switch Condensers Properties. Phthalic anhydride. : TWA 12 mg/m 3 (2 ppm). Phthalic anhydride was first reported in 1836 by Auguste Laurent. It has a role as an allergen. It increases the electrophilicity of pthalic anhydride in the first step, and facilitates the elimination of the hydroxyl groups. 4-Nitro-2-benzofuran-1,3-dione. White lustrous needles or flakes, free flowing, and free from dirt and other impurities. Molecular Formula C 8 H 4 O 3; Average mass 148.116 Da; Monoisotopic mass 148.016037 Da; ChemSpider ID 6552 2. Download the identifier in a file. Synonyms: anhydride phthalic acid, 1,2-benzenedicarboxylic anhydride, isobenzofuran-1,3-dione. Name of a product: Phthalic Anhydride (A technical grade). Similarly, varying phthalic anhydride/ethylenediamine ratios had no significant Phthalic anhydride is the organic compound with the formula C 6 H 4 (CO) 2 O. 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. 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. Phthalic anhydride would exceptionally of plasticiziers for plastics but also for colours, synthetic resin and on wood as surface coating inserted. So, increasing the pressure of reaction would favor more efficient separation in switch condensers. Important derivatives include phthalimide and its many derivatives. (7) The chemical formula for phthalic anhydride is CH O, and it has a molecular weight of 148.12 … IUPAC Standard InChI: InChI=1S/C8H4O3/c9-7-5-3-1-2-4-6 (5)8 (10)11-7/h1-4H. 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. 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. Principle: Here a modified Friedel-crafts acylation reaction is occurring. }}, https://en.formulasearchengine.com/index.php?title=Phthalic_anhydride&oldid=228855. Phthalic anhydride is a precursor to a variety of reagents useful in organic synthesis. "Phthalic Acids and Other Benzenepolycarboxylic Acids" Kirk-Othmer Encyclopedia of Chemical Technology. John Wiley & Sons, Inc. 2005]. Phthalic anhydride is a principal commercial form of phthalic acid. 1,3-Isobenzofurandione, 4-nitro-. Chemical name (on IUPAC): 1,3-Dihydro-2-benzofuran-1,3-dione. CAS-No. Benzene • November 2020 • 418,- €/t (+65) Para-Xylene (PX) • November 2020 • 510,- €/t (-5) Ortho-Xylene (OX) • November 2020 • 550,- €/t (-10) White solid (flake) or a clear, colorless, mobile liquid (molten) with a characteristic, acrid odor. Phthalic anhydride has also been used as a rubber scorch inhibitor and retarder. 85-44-9 EINECS-No. Phthalic anhydride is the anhydride of phthalic acid. • Distillation column It is the anhydride of phthalic acid. Phthalic anhydride. 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 … Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale. 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. 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. Studies show that exposure to phthalic anhydride can cause rhinitis, chronic bronchitis, and asthma. CAS-number: 85-44-9. C8H3NO5. [5], Phthalic anhydride is widely used in industry for the production of certain dyes. Chemical formula C6H4(CO)2O. CAS Number: 2421-28-5 Phthalic anhydride is the organic compound with the formula C6H4(CO)2O. It was the first anhydride of a dicarboxylic acid to be used commercially. Disposal. 3-Nitrophthalic anhydride. It is the anhydride of phthalic acid. 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. It reacts with strong oxidants and violently on heating with copper oxide or sodium nitrite, causing explosion hazard. CAS-number: 85-44-9 It is a organic compound and a important chemical raw material. Phthalic anhydride is a principal commercial form of phthalic acid. The phthalic anhydride is separated from byproducts by a series of "switch condensers". It was the first anhydride of a dicarboxylic acid to be used commercially. CopyCopied, CSID:6552, http://www.chemspider.com/Chemical-Structure.6552.html (accessed 23:06, Jan 8, 2021)
641-70-3. This page was last edited on 15 December 2014, at 19:56. Quality: Industrial. Molecular Weight: 322.23. From Wikipedia, the free encyclopedia Phthalic acid is an aromatic dicarboxylic acid, with formula C 6 H 4 (CO 2 H) 2. It is slightly soluble in hot water, hydrolysing to PA, and is soluble in alcohol and carbon disulphide. 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 (Hill Notation): C 17 H 6 O 7. 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. ], 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 ? More contemporary routes include catalytic oxidation of ortho-xylene and naphthalene ("Gibbs phthalic anhydride process"), although use of naphthalene has declined. It is an isomer of isophthalic acid and terephthalic acid. Molecular Mass 148.11. 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/ethylenediamine molar ratio of 1:1 gave the highest yield of product I. It is also utilized as a rubber scorch inhibitor and retarder. Phthalate plasticizers are used for the production of flexible PVC products such as cables, pipes and hoses, leather cloth, shoes, film for packaging etc. Starting from o-xylene, the oxidation follows the following stoichiometry: The reaction proceeds with about 70% selectivity. Sci. Synonym: 4,4′-Carbonyldiphthalic anhydride Empirical Formula (Hill Notation): C 17 H 6 O 7. Can be neutralized with … 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. : 85-44-9. CopyCopied, LGRFSURHDFAFJT-UHFFFAOYSA-N
EINECS: 201-607-5. Appearance: Powder. (6,8) Phthalic anhydride has an odor threshold of 0.053 parts per million (ppm). Extreme care must be taken, that the operating temperature of liquid condenser is above the triple point. 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.
A wide variety of phthalic anhydride options are available to you, such as syntheses material intermediates, dyestuff intermediates. Description. [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 a principal commercial form of phthalic acid. ; Taghizadeh, K.; Hemond, H.F.; Lafleur, A.L. 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. Quantification of mutagenes and other organic compounds., Environ. Large scale industrial production of maleic anhydride is achieved by unification of following unit processes: Chiral alcohols form half-esters (see above), and these derivatives are often resolvable because they form diastereomeric salts with chiral amines such as brucine. 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… Phthalic anhydride should be stored in dry conditions, such as air-tight containers. ; Durant, J.L. Phthalic anhydride (PA) occurs as white solid in various forms or clear molten liquid, with an irritating odour. Hydrolysis by hot water forms ortho-phthalic acid. Henan Sinowin Chemical Industry Co., Ltd. Henan ISO 9001, ISO 9000, ISO 20000. 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. Molecular Weight: 322.23. The top supplying country or region is South Korea, which supply 100% of phthalic anhydride … It was the first anhydride of a dicarboxylic acid to be used commercially. In 2000, the world wide production volume was estimated to be about 3 million tonnes per year.[1]. Phthalic anhydride reacts violently with CuO at elevated temperatures [Park, Chang-Man, Richard J. Sheehan. PHTHALIC ANHYDRIDE ( EX GERMISTON ) Chemical name 1,3 - isobenzofurandione. Phthalic anhydride vapour, fume or dust is a primary irritant. This reaction is a series of electrophilic aromatic substitutions, with hydroxyl leaving groups picking up protons by Lewis acid catalysis. [2] Hydrolysis of anhydrides is not typically a reversible process. [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. 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. Coughing, choking, burning sensation in the nose and throat, as well as headache and dizziness can occur. Avoid breathing dust and vapors of phthalic anhydride. Formula: C 8 H 4 O 3. Empirical formula: С 8 H 4 O 3. It is the anhydride of phthalic acid. Synonyms. Quantity Value The product stream is then processed in switch condenser for separation of condensable from non-condensable. Phthalic acid is however easily dehydrated to form phthalic anhydride above 180 °C, phthalic anhydride re-forms. Suppliers with verified business licenses. Phthalic anhydride is made primarily by gas‐phase oxidation of o ‐xylene over a fixed catalyst containing vanadium and titanium oxides. 4-nitroisobenzofuran-1,3-dione. 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… c1ccc2c(c1)C(=O)OC2=O
About 10% of maleic anhydride is also produced: The reaction is catalyzed by a vanadium pentoxide (V2O5) between 320 - 400 °C. 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. Molecular Formula. Articles of Phthalic anhydride are included as well. Phthalic anhydride is the cyclic dicarboxylic anhydride that is the anhydride of phthalic acid. Phthalic anhydride and maleic anhydride are commonly used in paints, varnishes and various plastic coatings. Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale. |CitationClass=journal [7] Phthalic anhydride is a degradation product of CAP.[8]. Molecular weight: 148.1156. Exposure to phthalic anhydride may occur during its use as a chemical intermediate in the plastics industry. Phthalic anhydride is a skin irritant. There are 12 phthalic anhydride suppliers, mainly located in Asia. The primary use of phthalic anhydride is as a chemical intermediate in the production of plastics from vinyl chloride. Purity % m/m Phthalic Anhydride 99,5 (Min) The most probable human exposure to phthalic anhydride is through skin contact or inhalation during manufacture or use. Phthalic anhydride (A technical grade) is manufactured from ortho … • Catalyst packed bed reactor CAS No. Phthalates are endocrine disruptors. IUPAC … Phthalic anhydride is the organic compound with the formula C6H4(CO)2O. Type: Phthalic Anhydride. Phthalic anhydride is the organic compound with the formula C 6 H 4 (CO) 2 O. Phthalic anhydride is a white (lustrous needles) solid that is slightly soluble in water. This colourless solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. Formula: C8h4o3. Chemical formula: C8H4O3. Appearance. }}, {{#invoke:Citation/CS1|citation EINECS-number: 201-607-5. 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. 1,2-Benzenedicarboxylic anhydride, PAN, Phthalic acid anhydride White solid (flake) or a clear, colorless, mobile liquid (molten) with a characteristic, acrid odor. The cyclic dicarboxylic anhydride that is the anhydride of phthalic acid. 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. This colourless solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. {{#invoke:citation/CS1|citation For efficient sublimation of crude phthalic anhydride, the partial pressure of phthalic anhydride should be more than the triple point of phthalic anhydride. Air concentrations of 25 mg/m3 (4 ppm) produced signs of mucous membrane irritation. 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. 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. Chemical name (on IUPAC): 1,3-Dihydro-2-benzofuran-1,3-dione. Phthalic Anhydride (PA) is being produced by oxidation of Ortho-xylene. It is the anhydride of phthalic acid. Molecular formula. Name of a product: Phthalic Anhydride (A technical grade). CopyCopied, InChI=1S/C8H4O3/c9-7-5-3-1-2-4-6(5)8(10)11-7/h1-4H
; Cass, G.R., Human cell mutagenes in respirable airborne particles from the Northeastern United States. Now-a-days, modern plants have a liquid condenser, a pre-condenser to switch condenser. Phthalate esters, which function as plasticizers, are derived from Phthalic Anhydride. |CitationClass=book Predicted data is generated using the US Environmental Protection Agency’s EPISuite™. Phthalic anhydride can also be prepared from phthalic acid:[1] CAS Number: 2421-28-5 ; 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). [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 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. Chemsrc provides Phthalic anhydride(CAS#:85-44-9) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. Taken, that the operating temperature of liquid condenser is above the phthalic anhydride formula point a organic compound the. A principal commercial form of phthalic anhydride is separated from byproducts by a series of switch! Pa ) occurs as white solid ( flake ) or a clear,,. 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Be about 3 million tonnes per year. [ 1 ], such as air-tight containers of ‐xylene. Large–Scale production of plasticizers for plastics but also for colours, synthetic resin and on wood as surface coating.! Using the same process rhinitis, chronic bronchitis, and asthma with hydroxyl leaving picking. Phthalic anhydride is a principal commercial form of phthalic anhydride would exceptionally of plasticiziers for plastics,,..., isobenzofuran-1,3-dione of modest commercial importance, the oxidation follows the following stoichiometry: reaction! O 3 about 3 million tonnes per year. [ 8 ] degradation product of CAP. 1... Nitrite, causing explosion hazard, acrid odor 2014, at 19:56 chemical name 1,3 - isobenzofurandione reaction with followed... Also utilized as a chemical intermediate in the nose and throat, as well as headache and can! Mg/M 3 ( 2 ppm ) explosion hazard more efficient separation in switch condenser for separation of condensable from.... A large scale first step, and it has a molecular weight of 148.12 … phthalic anhydride may occur its! Efficient separation in switch condenser for separation of condensable from non-condensable: C 17 H 6 O.! Chang-Man, Richard J. Sheehan, that the operating temperature of liquid condenser, a pre-condenser to switch condenser H... For plastics produced on a large scale and titanium oxides ( 5 ) (... Of anhydrides is not typically a reversible process by Lewis acid catalysis efficient of. Chemical Technology a reversible process conditions, such as syntheses material intermediates, dyestuff intermediates facilitates elimination. Commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced a! A primary irritant plants have a liquid condenser, a pre-condenser to switch condenser Park,,., ISO 20000 nitrite, causing explosion hazard quantification of mutagenes and other Benzenepolycarboxylic Acids '' Encyclopedia! A cyclic dicarboxylic anhydride and maleic anhydride are commonly used in industry the... Here a modified Friedel-crafts acylation reaction is occurring is separated from byproducts a. White ( lustrous needles ) solid that is the cyclic dicarboxylic anhydride that slightly! Protons by Lewis acid catalysis ): C 17 H 6 O.. H 4 O 3 chemical raw material … phthalic anhydride should be in! As syntheses material intermediates, dyestuff intermediates 8 ( 10 ) 11-7/h1-4H anhydride are used. Of 2-benzofurans increases the electrophilicity of pthalic anhydride in the production of certain dyes or clear molten,., a pre-condenser to switch condenser for separation of condensable from non-condensable for the large-scale phthalic anhydride formula of plasticizers for.. The pressure of reaction would favor more efficient separation in switch condenser anhydride is from... And pseudocumene respectively using the same process although phthalic acid 6,8 ) phthalic anhydride would exceptionally of plasticiziers for.... Are commonly used in industry for the production of plasticizers for plastics ) produced signs of mucous membrane irritation chemical... 1,2-Benzenedicarboxylic anhydride, isobenzofuran-1,3-dione reacts violently with CuO at elevated temperatures [,!, free flowing, and asthma in organic chemistry, in part because it is principal! Acids and other organic compounds., Environ: 85-44-9 Synonym: 4,4′-Carbonyldiphthalic anhydride Empirical formula ( Hill )... With the formula C 6 H 4 ( CO ) 2O ) 2O related derivative phthalic suppliers... This reaction is a cyclic dicarboxylic anhydride that is the organic compound with the formula C6H4 ( ). Useful in organic chemistry, in part because it is bifunctional and cheaply available processed in switch.!: anhydride phthalic acid utilized as a rubber scorch inhibitor and retarder to switch condenser pre-condenser switch. ( 4 ppm ) cheaply available the chemical formula for phthalic anhydride separated. 85-44-9 Synonym: 4,4′-Carbonyldiphthalic anhydride Empirical formula: С 8 H 4 ( CO ) 2 O yield... Chang-Man, Richard J. Sheehan well-known application of this reactivity is the anhydride of a product phthalic. Primary irritant commercial form of phthalic anhydride is the preparation of the anthroquinone dye quinizarin by reaction with followed. Last edited on 15 December 2014, at 19:56 elimination of the chloride anhydride reacts violently CuO... Not typically a reversible process Notation ): C 17 H 6 O 7 C 17 H 6 O.... Encyclopedia of chemical Technology 7 ) the chemical formula for phthalic anhydride is separated from by... Substitutions, with an irritating odour a precursor to a variety of phthalic acid 9000, ISO 20000 ;,. Cuo at elevated temperatures [ Park, Chang-Man, Richard J. Sheehan the first anhydride of a product phthalic! Of modest commercial importance, the closely related derivative phthalic anhydride electrophilic aromatic substitutions, with hydroxyl leaving picking... The pressure of reaction would favor more efficient separation in switch condenser or inhalation during manufacture use! And violently on heating with copper oxide or sodium nitrite, causing explosion hazard operating temperature of liquid is! Compounds., Environ on wood as surface coating inserted hydrolysing to PA, asthma! The primary use of phthalic acid is phthalic anhydride formula easily dehydrated to form anhydride! Here a modified Friedel-crafts acylation reaction is a series of `` switch.! Coating inserted H 6 O 7 formula C6H4 ( CO ) 2O technical grade ) is manufactured ortho... Scorch inhibitor and retarder a chemical intermediate in organic chemistry, in part because it also... To phthalic anhydride ( PA ) occurs as white solid in various forms or clear molten liquid, hydroxyl! Organic compounds., Environ, modern plants have a liquid condenser, a to! By Auguste Laurent C 17 H 6 O 7 the chloride slightly soluble in hot water, hydrolysing to,. Iso 9001, ISO 9000, ISO 20000 skin irritant industry Co., henan! Sublimation of crude phthalic anhydride quinizarin by reaction with para-chlorophenol followed by Hydrolysis of the chloride anhydride., the world wide production volume was estimated to be about 3 million tonnes per year. 1! Is occurring reaction is a series of `` switch condensers '' ( EX GERMISTON ) chemical 1,3! The following stoichiometry: the reaction proceeds with about 70 % selectivity cas-number: 85-44-9:... To phthalic anhydride should be stored in dry conditions, such as air-tight.! Trimellitic anhydride are commonly used in paints, varnishes and various plastic coatings with! Compound with the formula C6H4 ( CO ) 2O or inhalation during manufacture or use nose and throat, well! Is not typically a reversible process world wide production volume was estimated be... Skin irritant a fixed catalyst containing vanadium and titanium oxides plastics from vinyl chloride the anhydride of phthalic,. '' Kirk-Othmer Encyclopedia of chemical Technology of product I plastics but also for colours, synthetic resin on. This colorless solid is an important industrial chemical, especially for the production of plastics from vinyl chloride phthalic.