Polymerization and recovery of 2-pyrrolidone with acid treatment

Details Polymerization and recovery of 2-pyrrolidone with acid treatment Polymerization and recovery of 2-pyrrolidone with acid treatment

1977-10-17

1980-02-05

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528326, 528486, 528487, 528490, C08G 6924

Patent

active

041873700

ABSTRACT:
An alkaline-catalyzed process for preparing poly-2-pyrrolidone characterized by the step of treating the polypyrrolidone reaction product mixture with an acid to prevent polymer agglomeration and prevent base-catalyzed polymer degradation. In another embodiment, unreacted poly-2-pyrrolidone is recovered by washing the acid-treated polymer reaction product mixture with water and the resulting wash water recovered, treated with further acid, and then subjected to a two-stage evaporation process. Poly-2-pyrrolidone is known as nylon 4, and can be shaped into filaments and various molded articles.

REFERENCES:
patent: 3184476 (1965-05-01), Wingfield et al.
patent: 3213066 (1965-10-01), Renfrew
patent: 3681293 (1972-08-01), Jarovitzky et al.
patent: 3778402 (1973-12-01), Kimura et al.
patent: 3968087 (1976-07-01), Choi
patent: 4050994 (1977-09-01), Anshus

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