Continuous method for obtaining butenes from a C 4 fraction

Details Continuous method for obtaining butenes from a C 4 fraction Continuous method for obtaining butenes from a C 4 fraction

2003-04-29

2008-10-07

Nguyen, Tam M. (Department: 1797)

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By addition of extraneous agent, e.g., solvent, etc.

C208S313000, C208S320000, C208S326000, C208S330000, C585S833000, C585S860000

Reexamination Certificate

active

07432411

ABSTRACT:
A continuous process for isolating butenes from a C4fraction comprising butanes, butenes and other C3-C5-hydrocarbons by extractive distillation using a selective solvent (LM), comprising a first process stage I in a scrubbing zone (E) and a second process stage II in a degassing zone (A), wherein the liquid or a substream of the liquid is taken off from the degassing zone (A) at a theoretical plate located one or more theoretical plates below the feed point for the bottom stream (LM/C4H8) from the scrubbing zone (E), heated and/or vaporized by indirect heat exchange with the hot bottom stream (LM) from the degassing zone (A) and returned to the degassing zone (A) at the same theoretical plate or above this, with the theoretical plate from which the liquid or substream of liquid is taken off being selected so that the total energy requirement in the process stages I and II is minimized, is proposed.

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