HEAT EXCHANGE UNIT AND METHOD FOR TAKEOFF AND/OR SUPPLY OF HEAT FROM/TO FLUID BEDS OF MATERIAL, APPLIANCE FOR IMPLEMENTATION OF REACTION IN FLUID BED OF CATALYST AND METHOD FOR ITS IMPLEMENTATION

摘要

Apparatus and process for heat exchange with fluid beds comprises heat-exchange tubes located longitudinally with respect to the axis of a fluidisation zone with a rectangular pitch, one side of which having a length (x) at least one and a half times the length (y) of the other side and/or with a triangular pitch, having two sides each at least one and a half times the length of the shortest side reduces the impact of the heat-exchange tubes on the fluidisation characteristics of the fluid bed. The invention is particularly suitable for oxidation reactions using molecular oxygen-containing gas in the presence of a fluid bed of fluidisable catalyst, such as (a) the acetoxylation of olefins, (b) the oxidation of ethylene to acetic acid and/or the oxidation of ethane to ethylene and/or acetic acid, (c) the ammoxidation of propylene and/or propane to acrylonitrile and (d) the oxidation of C4-compounds to maleic anhydride.