Patent ID: 8372771
Filing Date: 2013-02-12
Classification: B01J,C08F

Abstract:
1. A method for activating a chromium catalyst, comprising: increasing a temperature of the chromium catalyst in at least a bi-linear ramp, comprising increasing the temperature of the chromium catalyst at a first rate for a first period of time to a first temperature in a first ramp portion of the bi-linear ramp; increasing the temperature of the chromium catalyst at a second rate for a second period of time from the first temperature to a second temperature in a second ramp portion of the bi-linear ramp that immediately follows the first ramp portion, wherein the first rate is greater than the second rate, and wherein the first period precedes the second period; passing a fluid comprising oxygen through the chromium catalyst; and increasing a flow rate of the fluid through the chromium catalyst from a first flow rate to a second flow rate as the temperature of the chromium catalyst approaches the second temperature.