Process for producing phthalic anhydride
AssigneeNeste Oy
InventorJan Lindstrom
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Abstract
Process for producing phthalic anhydride by catalytic gaseous phase oxidation of o-xylene or naphthalene in the presence of catalyst, whereby the reaction is carried out in at least two separate reactors. The first reactor is a salt-cooled main reactor and the second reactor is a post-reactor without cooling means containing same or different catalyst as the first reactor, wherein the feed flow to the post reactor consists of only gaseous effluent from the first reactor and the gas flow in the second reactor takes place from up to down without saltbath cooling.
Claims5
Process for producing phthalic anhydride by catalytic gaseous phase oxidation of o-xylene or naphthalene in the presence of catalyst, characterized in that the reaction is carried out in a first reactor and a second reactor, and a cooler is placed between the first reactor and the second reactor, wherein the first reactor is a salt-cooled main reactor and the second reactor is a post-reactor without cooling means containing same or different catalyst as the first reactor, wherein the feed flow to the post reactor consists of only gaseous effluent from the first reactor and the gas flow in the second reactor takes place from up to down without saltbath cooling, and wherein the gaseous effluent from the first reactor is cooled in the cooler.
Dependencies are inferred from the claim text.