Distillation: processes – separatory – Addition of material to distilland to inhibit or prevent... – For inhibiting or preventing a polymerization reaction
Patent
1978-07-18
1979-12-04
Bascomb, Jr., Wilbur L.
Distillation: processes, separatory
Addition of material to distilland to inhibit or prevent...
For inhibiting or preventing a polymerization reaction
203 49, 203 69, 203 91, 585 5, B01D 334, C07C 718
Patent
active
041771109
ABSTRACT:
A method and apparatus is disclosed for the distillation of readily polymerizable vinyl aromatic compounds with polymerization inhibitors of low volatility, particularly a phenothiazine (PZ)-tertiarybutylcatechol (TBC) polymerization inhibitor combination. The method comprises introducing a feed of impure vinyl aromatic compound into a typical distillation train comprising a first fractionation column, a recycle column, and a finishing column; introducing as a separate stream into the upper portion of said recycle column and into said first fractionation column an effective amount of the PZ-TBC inhibitor in a volatile aromatic hydrocarbon diluent; and then distilling the vinyl aromatic compound in the presence of oxygen to recover an overhead product of high purity vinyl aromatic compound and a bottoms fraction.
REFERENCES:
patent: 2445941 (1948-07-01), Dreisbach
patent: 2607720 (1952-08-01), Elwell et al.
patent: 2757130 (1956-07-01), Burns
patent: 3239433 (1966-03-01), Costolow
patent: 3513078 (1970-05-01), Biarnais et al.
patent: 3515647 (1970-06-01), Van Tassell et al.
patent: 3515762 (1970-06-01), Koicle et al.
patent: 3629076 (1971-12-01), Jones
patent: 3674651 (1972-07-01), Otsuki et al.
patent: 3763015 (1973-10-01), Morimoto et al.
patent: 4061545 (1977-12-01), Watson
Bascomb, Jr. Wilbur L.
Cosden Technology, Inc.
LandOfFree
Method for the distillation of vinyl aromatic compounds using po does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for the distillation of vinyl aromatic compounds using po, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the distillation of vinyl aromatic compounds using po will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-90321