Purification of N-methyl-2-pyrrolidone

Details Purification of N-methyl-2-pyrrolidone Purification of N-methyl-2-pyrrolidone

1989-06-09

1990-01-23

Springer, David B.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D207267

Patent

active

048959596

ABSTRACT:
A method for purifying N-methyl-2-pyrrolidone containing thiophenol and/or diphenyl disulfide is disclosed, comprising adding a polyhalogenated aromatic compound and an alkali metal hydroxide and/or an alkali metal carbonate to the N-methyl-2-pyrrolidone containing thiophenol and/or diphenyl disulfide, heat treating the mixture, and subjecting the mixture to separation by distillation. The thiophenol and/or diphenyl disulfide can be removed with ease and at low cost.

REFERENCES:
patent: 2939869 (1960-06-01), Carlson
patent: 3354129 (1967-11-01), Edmonds et al.
patent: 3687907 (1972-08-01), Crouch et al.
patent: 4472585 (1984-09-01), Cleary
patent: 4501902 (1985-02-01), Cleary
patent: 4510316 (1985-04-01), Cleary et al.
patent: 4831160 (1989-05-01), Leighton

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