Process for producing sulfonylbis (phthalic anhydride)

Details Process for producing sulfonylbis (phthalic anhydride) Process for producing sulfonylbis (phthalic anhydride)

1990-06-22

1994-08-30

Shah, Mukund J.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549248, 562412, 562413, 562414, C07D30783

Patent

active

053429680

ABSTRACT:
A process for making relatively high purity eulfonylbis(phthalic anhydride) is provided. 3,3',4,4'-tetramethyl diphenyl sulfone is catalytically oxidized in a solvent under liquid phase elevated temperature and pressure conditions. The catalyst is constituted by cobalt, manganese, zirconium, and bromine. Sulfonylbis(phthalic) acid is recovered by crystallization and is then heated to produce the anhydride. Preferably, the acid is purified prior to dehydration.

REFERENCES:
patent: 3022320 (1962-02-01), Woodbury et al.
patent: 3920735 (1975-11-01), Wampfler et al.

Affiliated with

Also associated with

Rating

Process for producing sulfonylbis (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 producing sulfonylbis (phthalic anhydride), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing sulfonylbis (phthalic anhydride) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-30835