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Product Information Phthalic Anhydride, is an organic compound, chemical formula for C8H4O3, is phthalic acid molecular dehydration within the formation of cyclic anhydride, is a white crystalline powder, the relative density of 1.527, the melting point is not less than 131.61 ° C, boiling point of 295.1 ° C, can be sublimated. When encountered with boiling water or long time and water that is converted into phthalic acid. Insoluble in cold water, slightly soluble in hot water, ether, soluble in ethanol, pyridine, benzene, carbon disulfide, etc. It is an important organic chemical raw material, and is one of the most important Intermediates in the preparation of phthalic acid ester plasticizers, paints, saccharin, dyes and organic compounds. The compound is combustible and should be kept in ventilated, low-temperature and dry warehouse, and needs to be stored separately from oxidizing agents. Uses of Phthalic Anhydride
Phthalic Anhydride is the intermediate of fungicide Sterilizer, insecticide Imidethion and herbicide Methomyl. As one of the important organic chemical materials, it is used in the production of plasticizers, alkyd resins, unsaturated polyester resins, dyestuffs and pigments, pharmaceuticals and pesticides. Phthalic anhydride is a very important plasticizer. It can be polycondensed with polyol to produce polyarylate resin, which is mainly used in the paint industry. If chemosynthesized with ethylene glycol and unsaturated acid, it produces unsaturated polyester resins, which can be used in the manufacture of insulating paints and glass fiber reinforced plastics. The compound is also one of the important raw materials for the synthesis of benzoic acid and can also be used in medical applications.
Preparation of Phthalic Anhydride
Phthalic anhydride is generally produced industrially by oxidizing o-xylene to produce phthalic anhydride. The reaction is carried out using a vanadium-based catalyst with vanadium pentoxide as the main catalyst, and gas-phase oxidation is carried out in a column-tube fixed-bed reactor. Air is filtered, compressed, preheated and mixed with the vaporized o-xylene vapors and then fed into the reactor for oxidation reaction at 400°C to 600°C. The crude product is distilled to obtain phthalic anhydride. The crude product of the reaction is distilled to obtain phthalic anhydride. Company nformation
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(1)RubIber Products aging test belongs to the category of aging test, rubber aging refers to Rubber And Products in the processing, storage and use of the process, due to a combination of internal and external factors caused by the structure of the performance of the phenomenon caused by changes in the loss of use value. Expressed as cracking, sticky, hardening, softening, pulverization, discoloration, mold, etc.. (2)Water Treatment:The way of water treatment includes physical treatment and chemical treatment. Human water treatment methods have been quite a few years of history, physical methods, including the use of a variety of different pore size of the filter material, the use of adsorption or barrier way, the impurities in the water outside, adsorption method in the more important for the adsorption of activated carbon, barrier method is to pass the water through the filter material, so that the impurities of a larger size can not pass, and thus obtain cleaner water.
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