US 12,291,498 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)
Filed by Dow Global Technologies LLC, Midland, MI (US)
Filed on May 15, 2024, as Appl. No. 18/664,822.
Application 18/664,822 is a continuation of application No. 17/622,412, granted, now 11,987,547, previously published as PCT/US2020/037420, filed on Jun. 12, 2020.
Claims priority of provisional application 62/868,340, filed on Jun. 28, 2019.
Prior Publication US 2024/0300872 A1, Sep. 12, 2024
This patent is subject to a terminal disclaimer.
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)] 8 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.;
passing a high temperature dehydrogenation product upward and out of the primary separation device through an outlet tube, wherein the outlet tube is positioned directly above a body of the primary separation device;
following the exit of the high temperature dehydrogenation product from the primary separation device, combining the high temperature dehydrogenation product with a quench stream by passing the quench stream through a top of the outlet tube to cool the high temperature dehydrogenation product and form an intermediate temperature dehydrogenation product, 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.