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Article | REF: J6155 V1

Phthalic anhydride - Medium-temperature" process

Author: Nicolas LEPEU

Publication date: March 10, 2001

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1. Description of the "medium temperature" process

1.1 Principle

The controlled oxidation of orthoxylene or naphthalene with air between 350 and 430 ˚C (hot spot), in a fixed-bed vertical tubular reactor, leads to the following chemical reaction:

The enthalpies of reaction (taking into account by-products and combustion) are respectively :

• ΔH 1 = - 15.0 MJ...

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