Phthalic anhydride is a white lustrous needles solid that is slightly soluble in water. Oxidation of orthoxylene to phthalic anhydride using a. Phthalic anhydride pa production and manufacturing process. Modeling and simulation of phthalic anhydride production. The growing demand for phthalic anhydride as an intermediate for dye manufacture in the latter part of the nineteenth century made it imperative that cheaper means for its production be obtained. Of the current production, 50 percent is used for plasticizers, 25 percent for alkyd resins, 20 percent for unsaturated polyester resins. Pdf the main process to produce phthalic anhydride in the petrochemical plants is selective oxidation of oxylene within a fixed bed reactor. The oxidation products obtained were phthalic anhydride, maleic anhydride, o toluic aldehyde, carbon dioxide and water. The withdrawn azeotroping agent is separated from the water in the azeotropic mixture and returned to said melt. Phthalic anhydride production unit 700 now produces about 80,000 metric tonsyr of phthalic anhydride. Project report on phthalic anhydride manufacturing. The plant produces approximately 75,000 tonney of highpurity 99. Phthalic anhydride manufacturers sds msds sheet, suppliers and manufacturers represantative cas no 85449, einecs ec number.
Market overview, global phthalic anhydride market is projected to register a cagr of 4. Pdf simulation and optimization of the production of phthalic. It was the first anhydride of a dicarboxylic acid to be used commercially. Phthalic anhydride appears as a colorless to white lustrous solid in the form of needles with a mild distinctive odor. Homophthalic anhydride technical grade sigmaaldrich. The production of phthalic anhydride is approximately 20,000 tonsyear as required.
This white solid is an important industrial chemical, especially for the largescale production of plasticizers for plastics. Abstract phthalic anhydride is one of the most important products of modem largescale organic synthesis, and it has a wide application in various branches of chemical industry. Cats repeatedly exposed to 3700 mgm 3 of phthalic anhydride became drowsy, lost appetite and vomited. The effect of reaction temperature, feed flow rate ratio oxylene. Phthalic anhydride an overview sciencedirect topics. It is a white, organic, crystalline compound and is formed through the oxidation of naphthalene or oxylene. C8h4o3 finoric, etymologically derived from our business line of fine inorganic, organic and industrial chemicals, is the internationally preferred source for. The friedelcrafts reaction of phthalic anhydride with excess benzene as solvent and two equivalents of aluminum chloride proceeds rapidly and gives a complex salt of 2benzoylbenzoic acid in which one mole of aluminum chloride has reacted with the acid to form the salt rco2. The increasing use of phthalate plasticizers in automotive manufacturing coupled growing automotive industry is expected to drive demand over the forecast period. Production hcc produces pa by orthoxylene based process using the latest technology that guarantees high purity product. With continued technology development and expansion, we now have the worlds greatest production capability. This route was later replaced by the catalytic vapour phase oxidation of naphthalene in air in the presence of a vanadium oxide. If necessary refer to the material safety data sheet.
The global phthalic anhydride market is a matured one with almost no product differentiation, making the market competition more severe. Phthalic anhydride is a principal commercial form of phthalic acid. Pdf p scaledown of phthalic anhydride production at. Simulation and optimization of the production of phthalic anhydride from oxylene conference paper pdf available april 2014 with 11,275 reads how we measure reads. This colorless solid is an important industrial chemical, especially for the largescale production of plasticizers for plastics. Phthalic anhydride is usually used as a chemical median for the production of plastics from vinyl chloride.
The first commercial process for ma production was put into use by national aniline and chemical in 1928. Phthalic anhydride is used in the manufacture of plasticizers additives. Maleic anhydride is also obtained as a byproduct of the. Moderately toxic by inhalation or ingestion and a skin irritant. The most common method for production of phthalic anhydride is by oxidation of oxylene. As thirumalai chemicals limited, we have continually committed to protecting our society and the environment by safe with care operational manufacturing base capable and are delivering quality products. The objective of this study is to produce phthalic anhydride with a purity of 99. Figure 5 worldwide maleic anhydride production for the years 2000, 2005, 2009 3 7 11 5 figure 6 maleic anhydride process routes 12 6. Phthalic anhydride pa is used as the major ingredient in the manufacture of plasticizers, unsaturated polyester resin, paint and others. Che 455 fall 2009 major 1 phthalic anhydride production. Tccs phthalic anhydride is a toxic, white crystalline compound used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides.
Polynt group produces a great variety of anhydrides, but the most important ones are. International trade commission washington, dc 20436. Our pa plant is a manufacturing plant which opened for the first time in the republic of korea. A process for the manufacture of phthalic anhydride by oxidizing oxylene. 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. Consumption of phthalic anhydride for unsaturated polyester resin production is expected to increase moderately in 201823, but growth also varies by region. Simulation and optimization of the production of phthalic. Material balances design project production of phthalic anhydride. It remained so until after world war ii when oronite now chevron phillips chemical co. Pdf simulation and optimization of the production of. This is the amount of phthalic anhydride in the product stream, not the total mass of.
Dust, as well as vapours of phthalic anhydride, together with the air form explosive mixtures. Worldwide consumption of phthalic anhydride pa reached 6. Phthalic anhydride is the anhydride of phthalic acid. The feeds are essentially pure naphthalene and excess air. Phthalic anhydride 1 free download as powerpoint presentation. Pa phthalic anhydride introduction pa is white crystallike flakes at room temperature and transforms into clear colorless liquid at melting point. Reactors and separations design project phthalic anhydride. Separations and reaction engineering design project phthalic anhydride production your assignment is to continue evaluating the details of a process to produce 75,000 tonney of phthalic anhydride from oxylene. Pdf phthalic anhydride is the organic compound whose applications are mainly in the manufacture of phthalate plasticizers, phthalocyanine dyes. Scaledown of phthalic anhydride production at stws unit. Therefore, the production of polyesters from glycerol and phthalic acid should produce new materials for the preparation of desalination membranes and as modifiers for polyurethane foams.
Historically, naphthalene had been the feedstock for the production of phthalic anhydride pan. Finally, a comparison between the original design and the alternative one will be. The rapid development of the industrial production of polymeric materials during the last two decades increased the need of phthalic. Alternative process in this section, an alternative design of the production of phthalic anhydride from xylene is provided. Us4077984a manufacture of phthalic anhydride from oxylene or. Phthalic anhydride sds msds sheet of manufacturers, usa. Reactors and separations design project phthalic anhydride production we are continuing our evaluation of process alternatives for the production of phthalic anhydride via the catalytic oxidation of o xylene.
P scaledown of phthalic anhydride production at tbws unit 700. Table i 29 compares the costs of phthalic anhydride produced from naphthalene in both fixed and fluidized beds with that produced from axylene in a fixed bed reactor. Materials phthalic acid, dibutyltin dilaurate 10 wt. Phthalic anhydride is used to manufacture materials such as artificial resins. Draft scope of the risk evaluation for phthalic anhydride. Melt of phthalic anhydride containing a small amount of azeotroping agent is maintained at a temperature of from 160 to 200c. Phthalic anhydride trends phthalic anhydride downstream application areas, such as construction, automotive and marine industries have been severely affected by the financial crisis, especially in europe and north america some plasticisers producers are looking at production of nonphthalate plasticisers, where pa is not needed as a. We have developed a model for multitubular reactor of phthalic anhydride production utilizing these structured metallic monolith. Consequently, a method of oxidizing naphthalene by sulfuric acid in the presence of mercury salts to form phthalic anhydride was developed.
Phthalic anhydride from venezuela investigations no. Phthalic anhydride market new report by marketsandmarkets. Manufacture of phthalic anhydride from oxylene or naphthalene download pdf. It is a cyclic dicarboxylic anhydride and a member of 2benzofurans. Global phthalic anhydride pa market size was estimated at usd 6. The danger of autoignition may be avoided, using inert gas and wetting the dust. Cdc niosh pocket guide to chemical hazards phthalic. It used the weiss and downs process employing benzene as a raw material.
It is mostly used 60% of the world production for preparation plasticizers for pvc. The phthalic anhydride plant is an integral part of the iso 9001. The process was simulated using the process simulator aspen plus. The asian markets are forecast to see growth in demand, particularly china, india, and southeast asia, while consumption for unsaturated polyester resin is declining in japan.
Its production is currently based on the vapor phase oxidation of oxylene and naphthalene. Used as monomer for polymer production, laboratory chemical and intermediate 2. Phthalic anhydrides, maleic anhydride, trimellitic anhydride. Separations and reaction engineering design project. Phthalic anhydride was first produced by the oxidation of naphthalene in concentrated sulphuric acid in the presence of mercury sulphate. These are pressurized, heated and vaporized naphthalene and reacted in a fluidized bed with a vanadium oxide on silica gel catalyst. It is known as an adaptable intermediate in chemical processes because it is bifunctional and readily available.
Phthalic anhydride is the cyclic dicarboxylic anhydride that is the anhydride of phthalic acid. Us3112324a us2147a us214760a us3112324a us 3112324 a us3112324 a us 3112324a us 2147 a us2147 a us 2147a us 214760 a us214760 a us 214760a us 3112324 a us3112324 a us 3112324a authority us united states prior art keywords naphthalene phthalic anhydride zone vapors column prior art date 196001 legal status the legal status is an assumption and is not a legal conclusion. Major 1 phthalic anhydride production background you work for an operating company that produces, among other products, phthalic anhydride via the partial oxidation of oxylene in a fixedbed catalytic reactor. Petrotex also used their butenebased process in the early 1960s, which was later abandoned in favor. Phthalic anhydride market size, share, trends, global.
The developed model on simulation reveals minimization of hot spot formation and hence substantial reduction of runaway conditions within the reactor. Synthesis and characterization of polyesters derived from. Phthalic acid anhydride, 1,3isobenxofurandione, 1,2 benzene carboxylic acid anhydride identified uses. Phthalic anhydride in the form of vapor, fume, or dust irritates the eyes. Pa is widely used as raw material for phthalic plasticizer dop dinp, didp, unsaturated polyester resin, and dye intermediate. It is both an irritant and sensitizer of the skin and respiratory tract, and may produce asthma on repeated exposure.
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