Method for producing Maleic acid anhydride from the exhaust gas in Preparation Plant of PHTHALIC ACID anhydride

摘要

Method for producing Maleic acid anhydride as a secondary product in Preparation Plant of PHTHALIC ANHYDRIDE.The Exhaust gases from the installation of preparation of PHTHALIC ACID anhydride containing anhydrides of maleic and PHTHALIC acids, Quinones, citraconico, Wash, Enriched acidic solution by a recirculating Stream rich in respect of Maleic acid PHTHALIC between 17 and 20: 1: 1.PHTHALIC ACID was removed by Vacuum Crystallization and Filtration by Treatment of the obtained anhydride Maleic acid enriched in Solution.