US 11,939,540 B2
Systems and processes integrating steam cracking with dual catalyst metathesis for producing olefins
Sohel K Shaikh, Dhahran (SA); Raed H Abudawoud, Khobar (SA); Zhonglin Zhang, Dhahran (SA); Munir D Khokhar, Dhahran (SA); and Furqan Aljumah, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Jan. 3, 2023, as Appl. No. 18/092,655.
Application 18/092,655 is a continuation of application No. 16/830,759, filed on Mar. 26, 2020, granted, now 11,572,516.
Prior Publication US 2023/0151284 A1, May 18, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C10G 69/06 (2006.01); B01J 19/18 (2006.01); C07C 1/22 (2006.01); C07C 4/04 (2006.01); C07C 4/06 (2006.01); C07C 5/05 (2006.01); C07C 6/04 (2006.01); C07C 41/06 (2006.01); C10G 51/02 (2006.01); C10G 51/06 (2006.01); C10G 65/10 (2006.01); C10G 65/12 (2006.01)
CPC C10G 69/06 (2013.01) [B01J 19/1862 (2013.01); C07C 1/22 (2013.01); C07C 4/04 (2013.01); C07C 4/06 (2013.01); C07C 5/05 (2013.01); C07C 6/04 (2013.01); C07C 41/06 (2013.01); C10G 51/023 (2013.01); C10G 51/026 (2013.01); C10G 51/06 (2013.01); C10G 65/10 (2013.01); C10G 65/12 (2013.01); B01J 2219/0004 (2013.01); C10G 2300/1044 (2013.01); C10G 2400/20 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A process for producing olefins, the process comprising:
contacting a hydrocarbon feed with at least steam at a temperature of from 700° C. to 900° C., where contacting the hydrocarbon feed with the at least steam causes at least a portion of the hydrocarbon feed to undergo steam cracking to form a cracking reaction effluent comprising at least butenes;
separating the cracking reaction effluent to produce at least a C4 effluent comprising at least normal butenes, isobutene, and 1,3-butadiene;
subjecting the C4 effluent to selective hydrogenation to produce a hydrogenation effluent, where selective hydrogenation causes at least a portion of the 1,3-butadiene in the C4 effluent to react to form normal butenes;
removing isobutene from the hydrogenation effluent to produce a metathesis feed comprising at least normal butenes;
contacting at least a portion of the metathesis feed with a metathesis catalyst and a cracking catalyst directly downstream of the metathesis catalyst to produce a metathesis reaction effluent, where:
contacting the metathesis feed with the metathesis catalyst causes metathesis of normal butenes to produce at least ethylene, propene, and C5+ olefins; and
contacting with the cracking catalyst causes at least a portion of the C5+ olefins produced through metathesis to undergo cracking reactions to produce propene, ethylene, or both; and
the metathesis reaction effluent comprises at least ethylene, propene, or both;
wherein the metathesis reaction effluent and the cracking reaction effluent are obtained directly from the stream cracking step and the metathesis step, respectively;
combining the metathesis reaction effluent and the cracking reaction effluent upstream of a combined separation system; and
passing the cracking reaction effluent and the metathesis reaction effluent to the combined separation system; and
separating the cracking reaction effluent and the metathesis reaction effluent in the combined separation system to produce at least C4 effluent, a system propene effluent, and a system ethylene effluent.