Distillation: processes – separatory – Adding material to distilland except water or steam per se – At least two materials
Patent
1996-11-29
1998-02-17
McMahon, Timothy
Distillation: processes, separatory
Adding material to distilland except water or steam per se
At least two materials
203 51, 549250, C07D30789
Patent
active
057188084
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 a solvent having a boiling point in the range between about 150.degree. to 350.degree. C. and a freezing point of less than 40.degree. C., and, optionally, at least one by-product selected from the group consisting of: maleic anhydride, citraconic anhydride, benzoic acid and phthalic anhydride, in a contacting means 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 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 contacting means, thereby forming a liquid phase phthalic anhydride product having a phthalic anhydride concentration in the range between about 50-100 wt. %., preferably 90-100 wt. %, without the formation of an intermediate solid phase.
REFERENCES:
patent: 3178452 (1965-04-01), Smith et al.
patent: 3303203 (1967-02-01), Melnstein
patent: 3380896 (1968-04-01), Scheiber et al.
patent: 3397121 (1968-08-01), Fitzgerald
patent: 3507886 (1970-04-01), Suter et al.
patent: 3650906 (1972-03-01), Gehrken et al.
patent: 3655521 (1972-04-01), Gehrken et al.
patent: 3681399 (1972-08-01), Barth
patent: 3725211 (1973-04-01), Gehrken et al.
patent: 4285870 (1981-08-01), Keunecke et al.
patent: 4285871 (1981-08-01), Keunecke et al.
patent: 4568427 (1986-02-01), Danz et al.
patent: 5214157 (1993-05-01), Healy et al.
Agosto Magdiel
Baiel James J.
Gray, Jr. Ralph D.
Jones Larry O.
Exxon Chemical Patents Inc.
Hunt John F.
Jordan Richard D.
McMahon Timothy
LandOfFree
Solvent assisted process for recovery of phthalic anhydride in t does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Solvent assisted process for recovery of phthalic anhydride in t, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solvent assisted process for recovery of phthalic anhydride in t will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1781455