US 12,012,376 B2
Process of producing light olefins from isomerized straight run naphtha
Khalid A. Al-Majnouni, Riyadh (SA); Ahmad M. Al-Shehri, Riyadh (SA); Naif A. Aldalaan, Riyadh (SA); Debdut S. Roy, Bangalore (IN); Vidya Sagar Guggilla, Bangalore (IN); Nabil Alyasser, Brampton (CA); Ahmed Al-Zenaidi, Riyadh (SA); and Wojciech Supronowicz, Riyadh (SA)
Assigned to SABIC GLOBAL TECHNOLOGIES B.V., Bergen Op Zoom (NL)
Appl. No. 17/047,017
Filed by SABIC Global Technologies B.V., Bergen op Zoom (NL)
PCT Filed Apr. 11, 2019, PCT No. PCT/IB2019/052999
§ 371(c)(1), (2) Date Oct. 12, 2020,
PCT Pub. No. WO2019/211684, PCT Pub. Date Nov. 7, 2019.
Claims priority of provisional application 62/664,906, filed on Apr. 30, 2018.
Prior Publication US 2021/0147321 A1, May 20, 2021
Int. Cl. C07C 5/27 (2006.01); C07C 4/06 (2006.01)
CPC C07C 5/2708 (2013.01) [C07C 4/06 (2013.01); C07C 2529/40 (2013.01)] 5 Claims
 
1. A method of producing olefins, the method comprising:
isomerizing hydrocarbons of a naphtha stream by converting straight chain Cn hydrocarbons to branched Cn hydrocarbons and thereby form an isomerized naphtha stream;
catalytically cracking hydrocarbons of the isomerized naphtha stream to form olefins;
separating the isomerized naphtha stream to remove light gases including H2, methane, and ethane;
adding hydrogen to the naphtha stream prior to the isomerizing step;
heating hydrocarbons of the isomerized naphtha stream prior to the catalytic cracking step;
wherein the naphtha stream comprises straight run light naphtha and/or heavy naphtha;
wherein the catalyst for the isomerizing step is a chlorinated alumina-based catalyst;
wherein the isomerizing comprises contacting the naphtha stream with a catalyst at a temperature of 220 to 300° C. and pressure of 10 to 40 bars;
wherein the catalytic cracking is performed in a fixed catalyst bed reactor at a weight hourly space velocity in a range of 1 to 20 hr−1;
wherein the catalytic cracking is performed over a catalyst including Zeolite Y, and a metal including germanium, gallium, iron or combinations thereof;
wherein the naphtha stream is pre-heated to a temperature of 80 to 250° C. prior to isomerizing;
wherein the isomerizing is conducted in a fixed bed isomerization reactor; and
further comprising heating hydrocarbons of the isomerized naphtha stream to a temperature in a range of 500 to 680° C. prior to the catalytic cracking step.