US 10,889,535 B2
Process and apparatus for separating ethylene
Tae Woo Kim, Daejeon (KR); Sung Kyu Lee, Daejeon (KR); Joon Ho Shin, Daejeon (KR); and Yeonuk Choo, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 16/613,752
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Nov. 21, 2017, PCT No. PCT/KR2017/013234
§ 371(c)(1), (2) Date Nov. 14, 2019,
PCT Pub. No. WO2018/225908, PCT Pub. Date Dec. 13, 2018.
Claims priority of application No. 10-2017-0071315 (KR), filed on Jun. 8, 2017.
Prior Publication US 2020/0071244 A1, Mar. 5, 2020
Int. Cl. C07C 5/08 (2006.01); C07C 7/04 (2006.01)
CPC C07C 5/08 (2013.01) [C07C 7/04 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A process for separating ethylene from a feed stream comprising an initial C2 stream comprising acetylene, ethane and ethylene and a C3 stream comprising propylene, the process comprising the steps of:
feeding the feed stream comprising the initial C2 stream and the C3 stream into a first deethanizer column to discharge a first C2 stream from a top of the first deethanizer column and the C3 stream from a bottom of the first deethanizer column;
feeding a portion of the first C2 stream discharged from the top of the first deethanizer column into a second deethanizer column and discharging a second C2 stream from a top of the second deethanizer column;
introducing a downstream discharge of the second deethanizer column into the first deethanizer column again to reflux the first deethanizer column;
supplying the second C2 stream into a first acetylene converter to convert acetylene contained in the second C2 stream into ethylene and discharging a first ethylene stream from the first acetylene converter;
supplying a remaining portion of the first C2 stream discharged from the top of the first deethanizer column to a second acetylene converter to convert acetylene contained in the remaining portion of the first C2 stream into ethylene and discharging a second ethylene stream from the second acetylene converter; and
feeding the first ethylene stream and the second ethylene stream into an ethylene separation column to obtain ethylene.