Continuous polymerization of 2-pyrrolidone

Details Continuous polymerization of 2-pyrrolidone Continuous polymerization of 2-pyrrolidone

C - Chemistry, Metallurgy

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C08G 69/18 (2006.01) B01D 3/34 (2006.01) C07D 201/16 (2006.01) C07D 207/267 (2006.01) C08G 69/24 (2006.01)

Patent

CA 1112396

ABSTRACT OF THE DISCLOSURE 2-Pyrrolidone is continuously polymerized to a high-molecular- weight particulate product by the stirred polymerization of the carbonated alkaline polymerizate. The polymerizate is prepared by contacting an aque- ous hydroxide with excess 2-pyrrolidone, maintaining the resultant alkaline mixture at an elevated temperature for sufficient time to reduce the 2- pyrrolidone dimer content of the mixture to within the desired limits, de- hydrating the alkaline mixture to reduce the water content to within the desired limits, and contacting the alkaline mixture with carbon dioxide to form the carbonated alkaline polymerizate. The paste of particulate polypyrrolidone and liquid polymerizate is continuously withdrawn from the reactor, neutralized with aqueous acid and washed with warm water.

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