Purification of 2-pyrrolidone

Details Purification of 2-pyrrolidone Purification of 2-pyrrolidone

1974-06-24

1977-03-29

Waddell, Frederick E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D20726

Patent

active

040149005

ABSTRACT:
Commercially efficient process for purifying commercial 2-pyrrolidone into substantially pure anhydrous 2-pyrrolidone comprises treating liquid impure 2-pyrrolidone with a minor amount of a solid substantially anhydrous metal hydroxide and flash vaporizing from a heated surface under closely controlled temperature and pressure conditions in a molecular distillation apparatus, without establishing a vapor pressure equilibrium. Very dark colored commercial 2-pyrrolidone may be given a preliminary purification treatment by cooling until the 2-pyrrolidone solidifies and draining off the dark-colored liquid containing impurities.

REFERENCES:
patent: 2806856 (1957-09-01), Robinson
patent: 2828307 (1958-03-01), Soeterbroek et al.
patent: 2939869 (1960-06-01), Carlson
patent: 2964535 (1960-12-01), Clements
patent: 3006817 (1961-10-01), Ney
patent: 3290329 (1966-12-01), Doerfel

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