N-methyl-2-pyrrolidone → Butane

N-methylpyrrolidone, water, butene and/or butadiene and butane is obtained. The stream comprising N-methylpyrrolidone, water, butadiene and/or butene, with or without butane, which is obtained at the bottom of the extractive distillation column, is fed to a distillation column (c) in which butadiene and/or butene and optionally butane are obtained via the top. At the bottom of the distillation column, a stream comprising N-methylpyrrolidone and water is obtained, the composition of the stream comprising N-methylpyrrolidone and water corresponding to the composition as added to the absorption and the extraction. The stream comprising N-methylpyrrolidone and water is divided and passed back into the absorption and the extractive distillation. The ratio of the mixture of water and N-methylpyrrolidone which is supplied to the absorption to the mixture of water and N-methylpyrrolidone which is supplied to the extractive distillation is preferably in the range from 0.2 to 20, especially in the range from 0.3 to 15.

ORD record

ord-f0e3811987bc43b7afbcd5ea5239f5f0

Source dataset

uspto-grants-2013_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08420879B2