US 2010/0137664 A1Published application

Process for 1,3-butadiene separation from a crude c4 stream with acetylene converter

AssigneeSK Innovation Co., Ltd.

InventorsHee Du Lee, Kyung Jong Oh, Min Su Ko, Min Gyoo Park, Seong Jun Lee, Yoon Jae Yim, Seung Hoon Oh, Tae Jin Kim, Yong Seung Kim, Deuk Soo Park, Hong Chan Kim

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Abstract

Disclosed is a method of recovering 1,3-butadiene from a C4 stream containing butane, isobutane, 2-butene, 1-butene, isobutene, butadiene and acetylene. The process of recovering highly pure 1,3-butadiene includes acetylene conversion for selectively converting acetylene through liquid-phase hydrogenation, so that the acetylene content is decreased to 70 wt ppm or less, and 1,3-butadiene extraction using an extractive distillation column, a pre-separator, a solvent stripping column, a solvent recovery column, and a purification column. Through the acetylene conversion, the concentration of vinylacetylene is decreased to 70 wt ppm or less, after which 1,3-butadiene is recovered using only one extractive distillation column, thereby considerably decreasing the degree of utility and the loss of streams in the course of extraction. The number of units necessary for the process is decreased, thus remarkably reducing the time during which impurities can accumulate in a processing unit.

Claims16

Dependent claims

A method of separating highly pure 1,3-butadiene from a crude C4 stream, comprising:

(a) supplying the C4 stream into a plurality of hydrogenation reactors;
(b) selectively converting acetylene contained in the C4 stream through liquid-phase hydrogenation using the plurality of hydrogenation reactors, thus decreasing a content of acetylene to 70 wt ppm or less;
(c) supplying a stream from the plurality of hydrogenation reactors into an extractive distillation column along with an extraction solvent, thus conducting extractive distillation;
(d) introducing a bottom stream of the extractive distillation column into a pre-separator, thus supplying a top gas stream of the pre-separator into a solvent recovery column and supplying a bottom liquid stream of the pre-separator into a solvent stripping column;
(e) supplying a top stream of the solvent stripping column, containing part of the extraction solvent, butadiene, and acetylene, into the solvent recovery column along with the top stream of the pre-separator;
and
(f) introducing a top stream of the solvent recovery column, from which the extraction solvent is removed, into a purification column, thus obtaining highly pure 1,3-butadiene.

4 more elements

Dependencies are inferred from the claim text.