Patent ID: 9687765
Date: 2017-06-27
CPC Classifications: B01D,B01J,B04C

Claim:
1. An improved process for minimizing attrition of catalyst particles entrained in a combined flow of such particles and an entraining: gas in a catalyst recovery means during separation of such particles from the entraining gas, which process comprises causing the combined flow to contact a high velocity separation means at a was flow velocity of 16.8 meters per second to 25.9 meters per second and thereby remove from said combined flow at least 99.8 percent of the catalyst particles, wherein the improvement comprises: subjecting the combined flow, having an axis of flow direction, to a pre-treatment step that precedes contact of the combined flow with the separation means at the high gas flow velocity of from 16.8 meters per second to 25.9 meters per second, the pre-treatment step occurring at a lower gas flow velocity a range of from 7.6 meters per second to 15.2 meters per second in combination with a directional change away from the combined gas flow, which directional change is at least 90 degrees from the axis of flow direction and, which pre-treatment step combination of velocity and direction change causes removal from the combined flow greater than 80 percent of the catalyst particles such that less than 20 percent of the catalyst particles contact the high velocity separation means, the improved process providing a total catalyst attrition rate calculated in accord with the correlation r=Ku wherein said high velocity separation means comprises a combined flow deflector, wherein said a combined flow deflector is a disk.