Recovery of 2-pyrrolidone from dilute alkaline solutions

Details Recovery of 2-pyrrolidone from dilute alkaline solutions Recovery of 2-pyrrolidone from dilute alkaline solutions

1976-11-26

1977-09-27

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 14, 203 47, 203 73, 260 78P, 2603265FN, B01D 334, C07D20712

Patent

active

040509940

ABSTRACT:
A two-stage evaporative method for recovering polymerizable 2-pyrrolidone from alkaline aqueous solutions such as those obtained by washing the catalyst from an incompletely reacted polypyrrolidone polymerizate, includes the steps of neutralizing the base with mineral acid, removing most of the water in an initial reduced pressure evaporation and recovering the pyrrolidone from a salt/pyrrolidone slurry by vaporization under reduced pressure.

REFERENCES:
patent: 2939869 (1960-06-01), Carlson
patent: 3248388 (1966-04-01), Wintersberger et al.
patent: 3288687 (1966-11-01), Zimmerli et al.
patent: 3290329 (1966-12-01), Doerfel et al.
patent: 3597330 (1971-08-01), Wegerech et al.
patent: 3681293 (1972-08-01), Jarovitzky et al.
patent: 3850890 (1974-11-01), Ciaperoni
patent: 3968087 (1976-07-01), Choi

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