Patent GB-891536-A (GB)
Title: A fluidised bed chamber containing baffles
IPC: B01J8/24
Filed: 1959-01-20
Abstract: <PICT:0891536/III/1> <PICT:0891536/III/2> A fluidized bed chamber suitable for oil cracking (e.g. using benzine/steam fluidizing gas to produce a hydrogen/hydrocarbons p  mixture) or degasification comprises inclined baffle plates arranged in a plurality of layers one above another, said layers comprising only parallel, or groups of parallel, baffle plates; the horizontal orientation of said plates or a group of said plates in each upper layer being different from that of the plates or a corresponding group of the plates in the layer immediately below.  As shown, a plurality of layers 3 of flat baffle plates are arranged one above the other (Fig. 1), and supported by a grate 2 and stays 5, the baffle plates in each layer being divided into groups as shown in Fig. 2.  The plates are preferably inclined at 40 degrees to 65 degrees to the horizontal, and details are given of the size and spacing of the plates and of the relative disposition of the layers of baffle plates, which may vary throughout the reactor; it may be desirable to provide a space for premixing between the point of supply of the gas and the lowermost layer of the baffle plates.  The fluidized bed level preferably lies below the uppermost baffles so that any eruption in the bed is sufficiently controlled. The baffles may be of metals, alloys or ceramic, may be catalytically active and may have a protective layer of an erosion-resistant material.  Nozzles for cooling gas or liquid may be provided above the uppermost layer of baffle plates.  Specification 676,613, U.S.A. Specification 2,557,680 and German Specification 937,768 are referred to.ALSO:A fluidized bed chamber suitable for the catalytic conversion of butylene to butadiene, and <PICT:0891536/IV (b)/1> <PICT:0891536/IV (b)/2> benzene to diphenyl and terphenyl, comprises inclined baffle plates arranged in a plurality of layers one above another, said layers comprising only parallel, or groups of parallel, baffle plates; the horizontal orientation of said plates or a group of said plates in each upper layer being different from that of the plates or a corresponding group of the plates in the layer immediately below.  In the illustrated embodiment, a plurality of layers 3 of flat baffle plates are arranged one above the other (Fig. 1), and supported by a grate 2 and stays 5, the baffle plates in each layer being divided into groups as shown in Fig. 2. The plates are preferably inclined at 40 DEG -65 DEG  to the horizontal, and details are given of the size and spacing of the plates and of the relative disposition of the layers of baffle plates, which may vary throughout the reactor; it may be desirable to provide a space for premixing between the point of supply of the gas and the lowermost layer of the baffle plates.  The fluidised bed level preferably lies below the uppermost baffles so that any eruption in the bed is sufficiently controlled.  The baffles may be of metals, alloys or ceramic, may be catalytically active and may have a protective layer of an erosion-resistant material.  Nozzles for cooling gas or liquid may be provided above the uppermost layer of baffle plates.  Specifications 676,613, U.S.A. 2,557,680 and German 937,768 are referred to.