METHOD FOR PURIFYING RAFFINATE-2

Title:

METHOD FOR PURIFYING RAFFINATE-2

Document Type and Number:

WIPO Patent Application WO/2019/027165

Kind Code:

A2

Abstract:

The present invention relates to a method for separating and purifying 1-butene from raffinate-2 stream at high purity and a high yield, the method comprising the steps of: supplying raffinate-2 including n-butane, isobutane and 1-butene to a first distillation column to obtain heavy raffinate-3 including n-butane from the lower part of the first distillation column and recovering an upper fraction including 1-butene from the upper part thereof; and supplying the upper fraction including 1-butene into a second distillation column to recover a first lower fraction, enriched with 1-butene, from the lower part of the second column and recovering light raffinate-3 including isobutene from the upper part thereof, wherein the heat of the upper fraction recovered from the upper part of the first distillation column is supplied to the lower part of the second distillation column through a first heat exchanger, and 1-butene at high purity and high yield can be recovered while an energy recovery amount is maximized by means of a double effect distillation.

Inventors:

KIM SUNG KYUN (KR)
LEE SUNG KYU (KR)
BEYUN YONG MANN (KR)
SHIN JOON HO (KR)
KIM JI HYE (KR)

Application Number:

PCT/KR2018/008223

Publication Date:

February 07, 2019

Filing Date:

July 20, 2018

Export Citation:

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Assignee:

LG CHEMICAL LTD (KR)

International Classes:

C10G63/04

Foreign References:

KR20170096789A

2017-08-25

Other References: