METHOD OF ACTIVATING CHROMIUM-CONTAINING CATALYSTS Russian patent published in 2011 - IPC B01J37/00 B01J23/26 B01J38/02 C08F4/24 C08F10/00 

FIELD: chemistry.

SUBSTANCE: described is a method of activating a chromium-containing industrial catalyst for polymerisation of olefins, involving a firs step for treatment of the catalyst which includes a time for first increase in temperature to a first required value higher than 400°C, maintaining the first temperature for a first holding period at least greater than 0; at least a second step for treatment of the catalyst which includes a time for second increase in temperature to a second required value and maintaining the second temperature for a second holding period at least greater than 0, in which the second temperature is higher than the first, the common activation cycle is less than 20 hours, and the activated catalyst contains 40% or more conversion to chromium (+6). The invention also describes a method of activating a chromium-containing industrial catalyst for polymerisation of olefins, involving at least 2 steps, in which step 1 involves instant addition of catalyst to a medium pre-heated to a first temperature between approximately 400°C and approximately 700°C, while maintaining the first temperature for approximately 1-20 hours, followed by step 2 which involves raising temperature to a second temperature value between approximately 800°C and 900°C for a period of time less than or equal to 3 hours and maintaining the second temperature for approximately 1-10 hours, where the method is realised periodically or continuously, and a method of increasing efficiency of activating an industrial chromium-containing catalyst for polymerisation of olefins, involving: instantaneous treatment of the catalyst at temperature of approximately 800°C in a first atmosphere of nitrogen or carbon oxide; maintaining temperature for not less than approximately 15 minutes; replacing the first atmosphere with anhydrous air; and maintaining temperature for an additional period of time. Described also is a method for speeding up activation the industrial chromium-containing catalyst for polymerisation of olefins, involving raising temperature of the catalyst to a first temperature lower than or equal to 800°C for less than 10 minutes and maintaining the first temperature for less than or equal to 3 hours and then raising temperature to a second temperature value in less than 15 minutes and maintaining the second temperature for less than 10 hours, where the second temperature is higher than the first, and the activation method is less than 15 hours long overall.

EFFECT: shorter time required for activating the catalyst while increasing catalytic activity at the same time.

21 cl, 2 tbl, 4 dwg, 4 ex