	US 12,297,310 B2
	Methods for chromium catalyst activation using oxygen-enriched fluidization gas
Ralph W Romig, Kingwood, TX (US); James E. Hein, Houston, TX (US); Troy Bretz, Tomball, TX (US); and Zhihui Gu, Houston, TX (US)
Assigned to Chevron Phillips Chemical Company LP, The Woodlands, TX (US)
Filed by Chevron Phillips Chemical Company LP, The Woodlands, TX (US)
Filed on Jan. 25, 2023, as Appl. No. 18/159,119.
Application 18/159,119 is a continuation of application No. 17/179,475, filed on Feb. 19, 2021, granted, now 11,584,806.
Prior Publication US 2023/0159669 A1, May 25, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B01J 31/34 (2006.01); C08F 4/02 (2006.01); C08F 4/24 (2006.01); C08F 4/78 (2006.01); C08F 10/02 (2006.01); B01J 21/08 (2006.01); C08F 210/16 (2006.01)

CPC C08F 4/24 (2013.01) [B01J 31/34 (2013.01); C08F 4/02 (2013.01); C08F 10/02 (2013.01); B01J 21/08 (2013.01); C08F 4/78 (2013.01); C08F 210/16 (2013.01)]

21 Claims

1. A process to produce an activated chromium catalyst, the process comprising:

contacting a supported chromium catalyst with a gas stream comprising from 25 to 50 vol % oxygen at a peak activation temperature of from 550° C. to 900° C. to produce the activated chromium catalyst; wherein:

the supported chromium catalyst contains from 0.5 to 2 wt % of chromium, based on a weight of the supported chromium catalyst;

a linear velocity of the gas stream is in a range from 0.18 to 0.4 ft/sec; and

an oxygen linear velocity of the gas stream is in a range from 0.05 to 0.15 ft/sec.