Process for extracting N-methyl-2-pyrrolidone

Details Process for extracting N-methyl-2-pyrrolidone Process for extracting N-methyl-2-pyrrolidone

1989-10-11

1991-11-26

Lee, Mary C.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D207267

Patent

active

050683586

ABSTRACT:
The invention relates to a process for separating N-methyl-2-pyrrolidone (NMP) from aqueous solutions which are obtained in industry, inter alia, in the production of heat-resistance polymers such as polyamides and polyimides.
According to the invention, the extractants used are phenols which are sparingly soluble in water, are aliphatically monosubstituted and/or polysubstituted in the nucleus and have 4 to 16 carbon atoms in the straight-chain or branched, saturated or unsaturated aliphatic radical and have a boiling point which is preferably at least 20.degree.-25.degree. C. above the boiling point of NMP. If necessary, an inert, viscosity-reducing diluent is added.

REFERENCES:
patent: 4057491 (1977-11-01), Bushnell et al.
Chem. Abs., vol. 101, 1984, Abs. No. 101: 211,863a.
Nagaosa, Analytic Chimica Acta, 120 (1980) 279-287.
Chem. Abs. 70 (1979) 108066k.
Chem. Abs. 101 (1984) 9842n.
Chem. Abs. 82 (1975) 170665f.
Chem. Abs. 85 (1976) 142681b.
Chem. Abs. 94 (1981) 120315u.

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