naphthalene from phthalic anhydride

    Phthalic Anhydride - an overview | ScienceDirect Topics

    Phthalic anhydride is widely used worldwide for an extremely broad range of applications spanning from the plastics industry to the synthesis of resins, agricultural fungicides and amines. Its production is currently based on the vapor phase oxidation of o-xylene and naphthalene.

    What is a Phthalic Anhydride? - Definition from Corrosionpedia

    Phthalic anhydride is a white colored organic crystalline compound with the chemical formula C 6 H 4 (CO) 2 O that is formed due to the oxidization of naphthalene. It reacts exothermically when in contact with water and as such can accelerate corrosion.

    Phthalic anhydride CAS#: 85-44-9 - ChemicalBook

    Phthalic anhydride was first reported in 1836 by Auguste Laurent. It is presently obtained by catalytic oxidation of ortho-xylene and naphthalene ("Gibbs phthalic anhydride process"): C 6 H 4 (CH 3) 2 + 3 O 2 →C 6 H 4 (CO) 2 O + 3 H 2 O

    Naphthalene | 91-20-3

    Naphthalene is used in the production of phthalic anhydride; it is also used in mothballs. Naphthalene is also used in the manufacture of phthalic and anthranilic acids to make indigo, indanthrene, and triphenyl methane dyes, for synthetic resins, lubricant, celluloid, lampblack, smokeless powder, and hydronaphthalenes.

    Oxidation of ortho-xylene to phthalic anhydride using a .

    phthalic anhydride may be expected if phthalic anhydride were to be produced exclusively from a-xylene. Table I (29) compares the costs of phthalic anhydride produced from naphthalene in both fixed and fluidized beds with that produced from a-xylene in a fixed bed reactor. The advan­ tage of using a-xylene is apparent.

    Naphthalene - US EPA

    Naphthalene 91-20-3 Hazard Summary Naphthalene is used in the production of phthalic anhydride; it is also used in mothballs. Acute (short-term) exposure of humans to naphthalene by inhalation, ingestion, and dermal contact is associated with

    Phthalic Anhydride - The Chemical Company

    Phthalic anhydride is the anhydride of phthalic acid. This colorless solid is an important industrial chemical, especially for the large–scale production of plasticizers for plastics. It is presently obtained by catalytic oxidation of ortho–xylene or naphthalene. Phthalic anhydride can also be prepared from phthalic …

    Production of phthalic anhydride from pressed naphthalene .

    Pressed naphthalene is utilized for manufacturing the phthalic anhydride. Oxidation of the naphthalene is performed during manufacturing the anhydride. Influence of …

    Phthalic Anhydride - an overview | ScienceDirect Topics

    Phthalic anhydride is widely used worldwide for an extremely broad range of applications spanning from the plastics industry to the synthesis of resins, agricultural fungicides and amines. Its production is currently based on the vapor phase oxidation of o-xylene and naphthalene. The development of an alternative production route to the .

    Scale-Down of Phthalic Anhydride Production at STW's …

    Phthalic Anhydride Production Unit 700 now produces about 80,000 metric tons/yr of phthalic anhydride. The feeds are essentially pure naphthalene and excess air. These are pressurized, heated and vaporized (naphthalene) and reacted in a fluidized bed with a vanadium oxide on silica gel catalyst. The reactions are:

    US4472587A - Process for obtaining phthalic anhydride .

    The present invention concerns a process for obtaining phthalic anhydride by oxidizing ortho-xylene, naphthalene, or mixtures of the two, in the presence of a specific catalyst with a vanadium pentoxide and titanium dioxide base, and also regards the catalyst obtained by enactment of said process.

    US2815352A - Production of phthalic anhydride - Google Patents

    phthalic anhydride naphthalene air catalyst vaporous Prior art date 1957-12-03 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number Publication date 1957-12-03

    Phthalic anhydride | C6H4(CO)2O - PubChem

    Phthalic anhydride is an important intermediate in the chemical industry. The major subsequent product groups are plasticizers (56%), unsaturated polyester resins (17%), and alkyd resins (17%). Phthalic anhydride is also used as an intermediate in the production of pigments and dyes, agricultural, pharmaceutical, and several other chemical .

    Phthalic Anhydride (naphthalene) | ADDTEK

    Phthalic Anhydride (naphthalene) is produced by catalytic oxidation of naphthalene. As the anhydride of phthalic acid, phthalic anhydride is a toxic, white crystalline compound. Because of it's bifunctional and readily available, PA is an important industrial chemical, especially for the large–scale production of plasticizers for plastics.

    The Synthesis of Phthalic Anhydride via Ozonation of .

    The oxidation of naphthalene (1) (Scheme 1) in dichloromethane or acetonitrile with excess ozone gives phthalic aldehyde (3), 2-formyl benzoic acid (4) and phthalic anhydride (8). Small amounts of .

    Phthalic Anhydride (PA) Production and Manufacturing .

    Phthalic anhydride was first produced by the oxidation of naphthalene in concentrated sulphuric acid in the presence of mercury sulphate. This route was later replaced by the catalytic vapour phase oxidation of naphthalene in air in the presence of a vanadium oxide catalyst. Today, naphthalene .

    Phthalic Anhydride Production from Naphthalene | Intratec

    Phthalic Anhydride Phthalic Anhydride Production from Naphthalene. This report presents an up-to-date, detailed cost analysis of Phthalic Anhydride production from naphthalene. In the process examined naphthalene is oxidized by air in a fluidized bed reactor.

    naphthalene from phthalic anhydride,

    Synthesis of phthalic anhydride - PrepChem

    Feb 21, 2016· Preparation of phthalic anhydride. The catalytic oxidation of naphthalene can easily be carried out in the laboratory. It is of great importance that the correct temperature be maintained and that a suitable catalyst be used. Special attention must be given to the apparatus if the preparation in the laboratory is to succeed.

    Source Assessment: Phthalic Anhydride (Air Emissions)

    ----- EPA-600/2-76-032d December 1976 SOURCE ASSESSMENT: PHTHALIC ANHYDRIDE (AIR EMISSIONS) by R. W. Serth and T. W. Hughes Monsanto Research Corporation 1515 Nicholas Road Dayton, Ohio 45407 Contract No. 68-02-1874 ROAP No. 21AXM-071 Program Element No. 1AB015 EPA Project Officer: Dale A. Denny Industrial Environmental Research Laboratory Office of Energy, …

    Naphthalene | Koppers

    Naphthalene is primarily used for the production of phthalic anhydride and is derived from coal tar sources. Additional end-uses for it include naphthalene sulfonates used in certain concrete additives, drywall, and synthetic tanning agents.

    Production of phthalic anhydride from pressed naphthalene .

    Pressed naphthalene is utilized for manufacturing the phthalic anhydride. Oxidation of the naphthalene is performed during manufacturing the anhydride. Influence of …

    Phthalic anhydride | C6H4(CO)2O - PubChem

    Phthalic anhydride | C6H4(CO)2O or C8H4O3 | CID 6811 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological .

    Naphthalene - Chemical Economics Handbook (CEH) | IHS Markit

    The second-largest market for naphthalene applications is phthalic anhydride, but although phthalic anhydride production in most countries is by raw material ortho-xylene, in China, the world's largest phthalic anhydride market, naphthalene-based phthalic anhydride production has risen in …

    Phthalic acid - Wikipedia

    Phthalic acid is an aromatic dicarboxylic acid, with formula C 6 H 4 (CO 2 H) 2. It is an isomer of isophthalic acid and terephthalic acid. Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale.

    PBR Design for Phthalic Anhydride Production - academia.edu

    Sultan Qaboos University College of Engineering PCE Department Chemical Reaction Engineering PBR Design for Phthalic Anhydride Production Ahmed Hamed Al-Qasmi 88805 Abdullah Ghusen Al-Abri 89672 Abdullah Mohammed Al-Kharosi 90033 Abstract These papers illustrate a reactor design to produce Phthalic anhydride (PAN) in continuous plant through the oxidation of o-xylene.

    Phthalic Anhydride | Koppers

    Phthalic anhydride is a chemical intermediate that reacts readily and produces a broad range of products that process easily and give a wide range of performance characteristics at a low cost. Availability. Logistics services are available in the United States.

    the leading manufacturer of Phthalic Anhydride, Maleic .

    Chemical Industry: Used to produce plasticizers such as dibutyl phthalate, dioctyl phthalate and other aromatic esters, paints and glassfibre reinforced plastics such as unsaturated polyester resin and alkyd resin, and dyestuff like anthraquinone and phthalocyanine blue etc.

    Phthalic anhydride - Wikipedia

    e Consists of phthalic anhydride, maleic anhydride, benzoic acid. f Value shown corresponds to relatively fresh catalyst, which can change with catalyst age. Can be 9.5 - 13 kg/Mg (19 - 25 lb/ton) for aged catalyst. g Consists of phthalic anhydride and maleic anhydride. h Normally a vapor, but can be present as a particulate at low temperature.

    Definition of phthalic anhydride | Dictionary

    Phthalic anhydride definition, a white, crystalline, slightly water-soluble solid, C8H4O3, used chiefly in the manufacture of dyes, alkyd resins, and plasticizers. See more.

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