US 12,352,204 B2
Pyrolysis product compression using CO2 loop
Mark A. Rooney, Pasadena, TX (US); and Paul F. Keusenkothen, Houston, TX (US)
Assigned to ExxonMobil Engineering & Technology Company, Baytown, TX (US)
Appl. No. 17/782,679
Filed by ExxonMobil Chemical Patents Inc., Baytown, TX (US)
PCT Filed Dec. 18, 2020, PCT No. PCT/US2020/066161
§ 371(c)(1), (2) Date Jun. 6, 2022,
PCT Pub. No. WO2021/138093, PCT Pub. Date Jul. 8, 2021.
Claims priority of provisional application 62/954,775, filed on Dec. 30, 2019.
Claims priority of application No. 20168288 (EP), filed on Apr. 6, 2020.
Prior Publication US 2023/0027105 A1, Jan. 26, 2023
Int. Cl. F02C 3/22 (2006.01); C10G 9/00 (2006.01); F02C 1/10 (2006.01); F02C 3/10 (2006.01)
CPC F02C 3/22 (2013.01) [C10G 9/002 (2013.01); F02C 1/10 (2013.01); F02C 3/10 (2013.01); C10G 2300/4012 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A process for producing and compressing a process gas, the process comprising:
separating air to form at least an oxygen-containing stream, the oxygen-containing stream comprising 90 vol. % or more O2;
combusting at least a portion of a fuel with at least a portion of the oxygen-containing stream in the presence of at least a portion of a recycle stream to produce a heated working fluid, the recycle stream comprising 80 vol. % or more CO2;
expanding the heated working fluid to produce shaft power and a decompressed working fluid comprising at least CO2 and H2O;
pyrolyzing at least a portion of a hydrocarbon-containing feed to produce a process gas comprising ethylene;
separating the decompressed working fluid by performing a series of cooling and compressing steps to form a water stream and a CO2-containing stream, the CO2 in the decompressed working fluid and the CO2-containing stream being in a supercritical state during the series of cooling and compressing steps;
transferring at least part of the shaft power a) to a process gas compressor to compress the process gas, b) to a refrigeration compressor to cool the process gas, c) to a refrigeration compressor to cool the decompressed working fluid in a cooling step from the series of cooling and compressing steps, or d) a combination of two or more of a), b) and c); and
compressing at least a portion of the CO2-containing stream to form a compressed CO2-containing stream, the recycle stream comprising at least a first portion of the compressed CO2-containing stream.