Solvent recovery process for N-methyl-2-pyrrolidone in hydrocarb

Details Solvent recovery process for N-methyl-2-pyrrolidone in hydrocarb Solvent recovery process for N-methyl-2-pyrrolidone in hydrocarb

1976-03-26

1977-11-08

Levine, Herbert

Mineral oils: processes and products

Fractionation

Liquid extraction with solvents

203 14, 203 49, 203 82, 208326, C10G 2116

Patent

active

040574911

ABSTRACT:
N-methyl-2-pyrrolidone is recovered from the raffinate and extract phases produced by its use in hydrocarbon extraction processes, particularly lube oil extraction, through the use of flash evaporation and/or distillation followed by gas stripping. Water buildup in the recovered solvent is prevented by employing solvent dehydration means in the solvent recovery line after gas stripping. Proper control of process parameters enables the dehydration means to remove excess water without requiring additional heat input to the process.

REFERENCES:
patent: 2111822 (1938-03-01), Sullivan
patent: 2167730 (1939-08-01), Smoley
patent: 2687982 (1954-08-01), Baumann
patent: 2923680 (1960-02-01), Bushnell
patent: 3461066 (1969-08-01), Morris et al.

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