Patent GB-794090-A (GB)
Title: Improvements in or relating to reactors for catalytic conversion of hydrocarbons
Inventor: SHIRK ROBERT MARLIN
IPC: B01J8/02
Filed: 1955-10-17
Abstract: A reactor suitable for use in the dehydrogenation step of the process of Specification 794,089 comprises a vessel, a perforate horizontal partition extending across the middle region of said vessel so as to divide the same into an upper <PICT:0794090/IV (b)/1> reaction chamber and a lower gas-collecting plenum and being adapted to support a bed of solids of discrete particle size, said bed comprising a main body portion of granulated catalytic material, relatively shallow top and bottom layers of inert material and a shallow layer of inert material of intermediate particle size between the main body layer and the bottom layer, an axial gas inlet nozzle in the form of a venturi at the top of the vessel adapted to introduce separate gas streams into the axial nozzle, a baffle member, and a plurality of outlet nozzles at the bottom of said vessel adapted to withdraw separately and sequentially gaseous products passing from said reaction chamber into the plenum chamber through perforate partitions.  In a preferred embodiment the reactor comprises a short cylindrical section 102 provided with upper and lower ellipsoidal heads 103 and 104, the reactor as a whole approximating to a true ellipsoid. Bed 114 comprises 4 separate and distinct layers of solid particles, the lowermost and uppermost 115 and 1151 contain large size particles such as alumina spheres of 3/4 inch in diameter the lower layer 116 has particles of about 3/8 inch in diameter and the main body has particles of 3/16 to 1/4 inch in diameter.ALSO:A reactor suitable for use in the dehydrogenation step of the process of Specification 794,089, comprises a vessel, a perforate horizontal partition extending across the middle region of said vessel so as to divide the same into an upper reaction chamber and a lower gascollecting plenum and being adapted to support a bed of solids of discrete particle size, said bed comprising a main body portion of granulatic catalytic material, relatively shallow top and bottom layers of inert material and a <PICT:0794090/III/1> shallow layer of inert material of intermediate particle size between the main body layer and the bottom layer, an axial gas inlet nozzle in the form of a venturi at the top of the vessel adapted to introduce gas axially downward into the reaction vessel, branch nozzles in the form of a venturi adapted to introduce separate gas streams into the axial nozzle, a baffle member, and a plurality of outlet nozzles at the bottom of said vessel adapted to withdraw separately and sequentially gaseous products passing from said reaction chamber into the plenum chamber through perforate partitions.  In a preferred embodiment the reactor comprises a short cylindrical section 102 provided with upper and lower ellipsoidal heads 103 and 104, the reactor as a whole approximating to a true ellipsoid.  Bed 114 comprises 4 separate and distinct layers of solid particles; the lowermost and uppermost 115 and 1151 contain large size particles such as alumina spheres of 3/4 inch in diameter, the lower layer 116 has particles of about 3/8 inch in diameter, and the main body has particles of 3/16 to 1/4 inch in diameter.