N-methyl-2-pyrrolidone purification

Details N-methyl-2-pyrrolidone purification N-methyl-2-pyrrolidone purification

1989-08-21

1990-10-23

Springer, David B.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D20114, C07D207267

Patent

active

049653709

ABSTRACT:
A process for recovering N-methyl-2-pyrrolidone from an effluent stream in a poly(arylene sulfide) process containing N-methyl-2-pyrrolidone contaminated with acidic compounds and high boiling contaminants by contacting the kettle liquid from a heavies fractionation zone with an inorganic compound selected from the group consisting of alkaline earth oxides and alkaline earth hydroxides in an amount effective to reduce the acidic compound content of the kettle liquid, and introducing the treated kettle liquid into a thin film evaporation zone to produce an overhead product containing N-methyl-2-pyrrolidone and a bottoms stream containing N-methyl-2-pyrrolidone soluble reaction products of the acidic compounds with the inorganic compound, unreacted acidic compounds and high boiling contaminants. The thin film evaporation zone overhead product stream can be recycled to the heavies fractionation zone, or introduced to an N-methyl-2-pyrrolidone recovery zone and fractionated to produce an overhead product stream consisting essentially of N-methyl-2-pyrrolidone and an intermediate heavies bottoms stream. In a further embodiment, the N-methyl-2-pyrrolidone recovery zone overhead product can be recycled to the heavies fractionation zone.

REFERENCES:
patent: 3130108 (1964-12-01), Eckstrom et al.
patent: 3678983 (1972-07-01), Widmer et al.
patent: 4256568 (1981-03-01), Schlosberg et al.
patent: 4501902 (1985-02-01), Cleary
patent: 4510316 (1985-04-01), Cleary et al.
Luwa Corporation Bulletin, EV-24, "Luwa Thin Film Evaporation Technology".

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