Solvent recovery process for n-methyl-2-pyrrolidone in...

Details Solvent recovery process for n-methyl-2-pyrrolidone in... Solvent recovery process for n-methyl-2-pyrrolidone in...

C - Chemistry, Metallurgy

10

G

202/68

C10G 21/16 (2006.01) C10G 21/28 (2006.01)

Patent

CA 1097255

U.S. ?78,867 ABSTRACT OF DISCLOSURE 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.

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