Purification of N-(2-hydroxyethyl)-2-pyrrolidone

Details Purification of N-(2-hydroxyethyl)-2-pyrrolidone Purification of N-(2-hydroxyethyl)-2-pyrrolidone

2007-07-03

2007-07-03

Nguyen, Tam M. (Department: 1764)

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

C203S080000, C203S099000, C203SDIG019

Reexamination Certificate

active

10973151

ABSTRACT:
N-(2-hydroxyethyl)-2-pyrrolidone (HEP) is purified by a distillation sequence in which the purified HEP is recovered as a side stream without being separated as an overhead at any point in the procedure.

REFERENCES:
patent: 6726811 (2004-04-01), Ugamura et al.

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