Process for the preparation of N-alkyl-pyrrolidones

Details Process for the preparation of N-alkyl-pyrrolidones Process for the preparation of N-alkyl-pyrrolidones

2005-06-01

2010-11-16

Havlin, Robert (Department: 1626)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S313000

Reexamination Certificate

active

07834196

ABSTRACT:
A process for the production of N-alkylpyrrolidone from γ-butyrolactone and monoalkylamine in the liquid phase comprising the steps of: feeding monoalkylamine and γ-butyrolactone, in the absence of water or in the presence of less than about 1 wt % of water, to a reaction zone to form a reaction mixture; heating the reaction mixture; withdrawing a product stream from the reaction zone and passing the stream to a distillation zone comprising at least one distillation column operated at sub-atmospheric pressure; adding water to the distillation zone; isolating at least one overhead stream from the distillation zone comprising monoalkylamine, water and optionally N-alkyl-pyrrolidone and condensing the overhead stream against cooling water.

REFERENCES:
patent: 2964535 (1960-12-01), Clements
patent: 7227029 (2007-06-01), Rudloff et al.
patent: 06228088 (1994-08-01), None
patent: 2000256312 (2000-09-01), None
patent: 2001002640 (2001-01-01), None
patent: 2001354646 (2001-12-01), None
patent: 2001354647 (2001-12-01), None
patent: 9952867 (1999-10-01), None
patent: 03053924 (2003-07-01), None
International Preliminary Report on Patentability for PCT/GB2005/002170, dated Dec. 28, 2006.
International Search Report and Written Opinion for PCT/GB2005/002170, dated Aug. 23, 2005.

Affiliated with

Also associated with

Rating

Process for the preparation of N-alkyl-pyrrolidones 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 preparation of N-alkyl-pyrrolidones, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of N-alkyl-pyrrolidones will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4202262