Process for the production of phthalic anhydride

Details Process for the production of phthalic anhydride Process for the production of phthalic anhydride

1995-04-06

1997-03-04

McKane, Joseph

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549240, 549247, 549248, C07D30789

Patent

active

056080832

ABSTRACT:
The process for making phthalic anhydride by catalytic gas phase oxidation of o-xylene or naphthalene includes feeding a gas containing oxygen and the reactant to a first reactor; operating the first reactor to oxidize the reactant and obtain an effluent gas including the reactant, phthalic anhydride and/or maleic anhydride; adding the reactant or a gas containing the reactant to the effluent so that a molar ratio of moles of free oxygen to a sum of moles of the organic compounds in the effluent is less than 7, preferably from 3 to 6; after that, feeding the effluent into a second reactor; and operating the fixed bed reactor to at least partially convert the reactant in the effluent to phthalic anhydride. In preferred embodiments the gas fed to the first reactor is controlled so that it is in the range of the lower inflammability limit and, after separating phthalic anhydride from the effluent, from 15 to 35% of the resulting waste gas is blended with fresh air, compressed to form a gas mixture and then recycled.

REFERENCES:
patent: 3892781 (1975-07-01), Montgomery et al.
patent: 4435581 (1984-03-01), Miserlis
patent: 4675420 (1987-06-01), Block et al.
patent: 5225574 (1993-07-01), Aichenger et al.
patent: 5245093 (1993-09-01), Ember

Affiliated with

Also associated with

Rating

Process for the production of phthalic anhydride does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the production of phthalic anhydride, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of phthalic anhydride will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2147174