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Phthalic anhydride is obtained either by catalytic oxidation of ortho-xylene with O2 (oxygen) or by catalytic oxidation of naphthalene (called the Gibbs phthalic anhydride process 1918). The byproducts of the naphthalene reaction are carbon dioxide and water.
When separating the phthalic anhydride from byproducts such as o-xylene in water, or maleic anhydride, a series of switch condensers is required, rather than a complicated setup of distillation columns that never converge in many industrial process simulation programs such as AspenTech.
Phthalic anhydride is widely used in industry in the production of dyes (rhodamine, anthraquinone derivatives), insecticides, plasticizers and pharmaceuticals. It also finds use in analytical chemistry.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Phthalic_anhydride". A list of authors is available in Wikipedia.|