US 11,987,547 B2
Methods for forming light olefins that include use of cooled product as a recycled quench stream
Matthew T. Pretz, Lake Jackson, TX (US); Hangyao Wang, Pearland, TX (US); Anthony Plauck, Pearland, TX (US); and Adam M. McNeeley, Houston, TX (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 17/622,412
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Jun. 12, 2020, PCT No. PCT/US2020/037420
§ 371(c)(1), (2) Date Dec. 23, 2021,
PCT Pub. No. WO2020/263599, PCT Pub. Date Dec. 30, 2020.
Claims priority of provisional application 62/868,340, filed on Jun. 28, 2019.
Prior Publication US 2022/0356130 A1, Nov. 10, 2022
Int. Cl. C07C 5/333 (2006.01)
CPC C07C 5/3337 (2013.01) [C07C 2523/08 (2013.01); C07C 2523/42 (2013.01); C07C 2523/62 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method comprising:
introducing a hydrocarbon feed stream into a reactor, wherein the reactor comprises at least one reactor section operating as a fast fluidized, turbulent, or bubbling bed upflow reactor or a dilute phase riser reactor;
reacting the hydrocarbon feed stream with a dehydrogenation catalyst in the reactor to form a high temperature dehydrogenated product having a temperature of at least 550° C., the dehydrogenated product comprising at least a portion of the hydrocarbon feed stream that was not catalytically reacted;
separating at least a portion of the dehydrogenation catalyst from the high temperature dehydrogenated product in a primary separation device, wherein the temperature of the dehydrogenated product and dehydrogenation catalyst in the primary separation device is at least 550° C.;
following the exit of a high temperature dehydrogenation product from the primary separation device, combining the high temperature dehydrogenation product with a quench stream to cool the high temperature dehydrogenation product and form an intermediate temperature dehydrogenation product, and wherein a temperature of the intermediate temperature dehydrogenation product is at least 10° C. less than a temperature of the high temperature dehydrogenation product, and wherein the temperature of the high temperature dehydrogenation product is about equivalent to the temperature of the high temperature dehydrogenated product; and
cooling the intermediate temperature dehydrogenation product to form a cooled dehydrogenation product, wherein a portion of the cooled dehydrogenation product is utilized as at least a portion of the quench stream.