Distillation: processes – separatory – Adding material to distilland except water or steam per se – At least two materials
Patent
1996-11-29
1998-03-24
McMahon, Timothy
Distillation: processes, separatory
Adding material to distilland except water or steam per se
At least two materials
203 51, 549248, 549249, 549250, C07D30789
Patent
active
057308446
ABSTRACT:
A process for recovering phthalic anhydride as a liquid from a vapor phase oxidation product which comprises mixing the vapor phase oxidation product having a temperature of about 130.degree. C. or greater with a first stream comprising maleic anhydride, benzoic acid present in an amount of less than 8 mole %, based on the total concentration of the first stream, and at least one compound selected from the group consisting of: citraconic anhydride and phthalic anhydride, in a rectification tower such that a substantial portion of the phthalic anhydride contained within the vapor phase oxidation product transfers from the vapor phase to a liquid phase and a substantial portion of the by-products contained in the first stream which are more volatile than phthalic anhydride transfer from the liquid phase to the vapor phase and wherein a vapor-to-liquid weight ratio in the range between about 2 to 20 is exhibited within the rectification tower, thereby forming a liquid phase phthalic anhydride product having a phthalic anhydride concentration in the range between about 50-100 wt. %.
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Baiel James J.
Jones Larry O.
Exxon Chemical Patents Inc.
Hunt John F.
McMahon Timothy
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