US 12,378,168 B2
Methods for reducing formation of carbon disulfide in steam cracking processes to produce olefins
Hangyao Wang, Pearland, TX (US); Jorge H. Pazmino, Pearland, TX (US); Yu Liu, Lake Jackson, TX (US); and Georgios Bellos, Terneuzen (NL)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 18/001,811
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Jun. 17, 2021, PCT No. PCT/US2021/037732
§ 371(c)(1), (2) Date Dec. 14, 2022,
PCT Pub. No. WO2022/005755, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 20386034 (EP), filed on Jun. 29, 2020.
Prior Publication US 2023/0227382 A1, Jul. 20, 2023
Int. Cl. C07C 4/04 (2006.01); C07C 5/09 (2006.01); C07C 7/148 (2006.01); C10G 9/36 (2006.01); C10G 69/06 (2006.01); C10G 75/02 (2006.01)
CPC C07C 4/04 (2013.01) [C07C 5/09 (2013.01); C07C 7/14858 (2013.01); C07C 7/14875 (2013.01); C10G 9/36 (2013.01); C10G 69/06 (2013.01); C10G 75/02 (2013.01); C10G 2300/202 (2013.01); C10G 2300/207 (2013.01); C10G 2300/4075 (2013.01); C10G 2400/02 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for producing olefins, the method comprising:
passing a hydrocarbon feed comprising one or more hydrocarbons to a hydrocarbon cracking unit;
passing a hydrogen sulfide containing stream to the hydrocarbon cracking unit, where:
the hydrogen sulfide containing stream comprises hydrogen sulfide and a dilution gas;
a concentration of hydrogen sulfide gas in the hydrogen sulfide containing stream is less than or equal to 10,000 ppmw; and
a flow rate of the hydrogen sulfide containing stream to the hydrocarbon cracking unit is sufficient to produce a molar concentration of elemental sulfur in the hydrocarbon cracking unit of from 10 ppm to 200 ppm;
cracking at least a portion of the hydrocarbon feed in the hydrocarbon cracking unit to produce a cracker effluent; and
contacting the cracker effluent with a quench fluid in a quench unit to produce at least a cracked gas and a first pygas, wherein the cracked gas comprises at least one olefin product and the first pygas has a concentration of carbon disulfide less than 50 ppmw based on the total mass flow rate of the first pygas.