MAKING PHTHALIE ANHYDRIDE FROM TECHNICAL GRADE COKING NAPHTHALENE

摘要

1. The best period for vanadium - potassium - sulfate - silica gel catalyst operation in the oxidation of naphthalene to phthalic anhydride is 10 years, but even after 30 years of use, the catalyst activity is sufficient for the industrial production of phthalic anhydride.2. The degree of conversion of naphthalene to phthalic anhydride is dependent more on the quality of the technical naphthalene than anything else, and that naphthalene in the last decade involving the production of low-pyrolysis coal tar has positive characteristics for the production of phthalic anhydride. 3. In future operation of the plant without reloading of the contact apparatus, the outgoing gases must be rendered harmless by extensive catalytic oxidation, which excludes the formation of solid wastes.