Thermal stabilization of N-methyl-2-pyrrolidone

Details Thermal stabilization of N-methyl-2-pyrrolidone Thermal stabilization of N-methyl-2-pyrrolidone

1978-10-16

1979-09-18

Levine, Herbert

Mineral oils: processes and products

Fractionation

Liquid extraction with solvents

208326, C10G 2128

Patent

active

041682262

ABSTRACT:
The thermal decomposition of N-methyl-2-pyrrolidone is minimized by the addition of minor amounts of water thereto prior to its being heated to temperatures in excess of 500.degree. F. This is of particular importance in processes using N-methyl-2-pyrrolidone as an extraction solvent to remove aromatics from mixtures of aromatic and non-aromatic hydrocarbons and wherein the N-methyl-2-pyrrolidone is recovered from the extracted fractions by thermal means such as flash evaporation and distillation.

REFERENCES:
patent: 2933448 (1960-04-01), Morin et al.
patent: 3470089 (1969-09-01), Morris et al.
patent: 3476681 (1969-11-01), Davies et al.
patent: 3843515 (1974-10-01), MacDonald et al.

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