Method for purifying N-methyl-2-pyrrolidone

Details Method for purifying N-methyl-2-pyrrolidone Method for purifying N-methyl-2-pyrrolidone

2006-12-26

2006-12-26

Shameem, Golam M. M. (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C548S541000

Reexamination Certificate

active

07153978

ABSTRACT:
A method for purifying N-methyl-2-pyrrolidone is disclosed. The method comprises treating N-methyl-2-pyrrolidone with an alumina that desorbs less than 100 μmol/g of isobutylene between 225° C. and 400° C. in a standard tert-butyl alcohol dehydration test. The method enables the removal of at least about 80% of amine impurities or at least about 60% of APHA color from the NMP at 4 bed volumes treated.

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