FIELD: separation.
SUBSTANCE: group of inventions relates to a method and an apparatus therefor in order to minimise attrition of alkane or alkyl aromatic compound dehydrogenation catalyst particles, especially propane dehydrogenation catalyst particles entrained in an entraining gas in a catalyst recovery means during separation of such particles from entraining gas. Method for minimising attrition of catalyst particles comprises subjecting a combined flow, having an axis of flow direction, to pre-treatment that precedes contact of the combined flow with the separation means at a high gas flow velocity of 16.8 m/s to 25.9 m/s. Pre-treatment step occurs at a lower gas flow velocity within a range of 7.6 m/s to 15.2 m/s in combination with a directional change away from the combined gas flow, which directional change is at least 90° 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% of the catalyst particles such that less than 20% of the catalyst particles contact the high velocity separation means. Method provides a total catalyst attrition rate calculated in accordance with the correlation r = Ku2/√μ, that is at least 15% less than the total catalyst attrition rate without the pre- treatment step. High-speed separation means comprises a combined flow deflector, which is a disc. Device for minimising attrition of catalyst particles includes one or more high-speed cyclone separators configured to receive a combined flow at a gas flow rate of 16.8 to 25.9 m/s, a combined flow deflector arranged above the submerged taps of one or more cyclone separator. Combined flow deflector is a disc and is configured to change speed and direction, thereby removing from the combined flow more than 80% of the catalyst particles from the combined flow of catalyst particles and entraining gas so that less than 20% of the catalyst particles collide with the high-speed separation means. Speed of the combined gas flow after contact with the combined flow deflector ranges from 7.6 to 15.2 m/s, and the direction of the combined gas flow after contact with the combined flow deflector is deflected by at least 90° from the axis of the combined flow before contact with the combined flow deflector.
EFFECT: technical result is reduced attrition of the catalyst, as well as high recovery of catalyst particles from the combined flow.
10 cl, 1 ex, 2 dwg
