Patent GB-904221-A (GB)
Title: Improvements relating to apparatus for the treatment of crude benzene prior to the catalytic pressure refining thereof
IPC: C07C7/163
Filed: 1958-10-30
Abstract: <PICT:0904221/III/1> Apparatus for treating crude benzene prior to its catalytic pressure refining comprises an evaporator, in which hot hydrogen is passed upward through the crude liquid benzene, provided at or near its upper end with a layer of finely divided catalyst through which the vapourgas mixture must flow.  Various hydrogenation catalysts are mentioned.  In the specific embodiment shown, crude benzene supplied through pipe 4 accumulates at 5,51 on trays 2, 3 in the evaporator 1.  The liquid flows from 2 to 3 through overflow pipe 6 and from 3 through overflow pipe 7 to the conical bottom 8 of the tower, from which non-evaporatable residue can be removed through pipe 9.  Hot hydrogen from pipe 10 is led to mixing device 11 to which liquid from sump 12 is fed through heater 13 and the liquid/hydrogen mixture passes through pipe 14 back into the evaporator at a point above the surface of the sump 12.  The hydrogen charged with evaporatable constituents flows through pipe 15 to be mixed in device 16 with liquid from 51 fed via heater 17, the mixture returning through pipe 18 to the evaporator.  Liquid from 5 is similarly mixed with hydrogen.  The vapour-gas mixture from 5 ascends through grid-like tray 22 and layer of finely divided catalyst 23 (inserted through aperture 24) and is finally conveyed through pipe 25 to a heater prior to separation of hydrogen (for return through pipe 10) from condensable constituents in a reaction chamber.  The temperature of the catalyst layer during operation corresponds with that of the gas-vapour mixture flowing therethrough.ALSO:<PICT:0904221/IV (b)/1> Apparatus for treating crude benzene prior to its catalytic pressure refining comprises an evaporator, in which hot hydrogen is passed upward through the crude liquid benzene, provided at or near its upper end with a layer of finely divided catalyst through which the vapour-gas mixture must flow.  Various hydrogenation catalysts are mentioned.  In the specific embodiment shown, crude benzene supplied through pipe 4 accumulates at 5,51 on trays 2, 3 in the evaporator 1.  The liquid flows from 2 to 3 through overflow pipe 6 and from 3 through overflow pipe 7 to the conical bottom 8 of the tower, from which non-evaporatable residue can be removed through pipe 9.  Hot hydrogen from pipe 10 is led to mixing device 11 to which liquid from sump 12 is fed through heater 13 and the liquid/hydrogen mixture passes through pipe 14 back into the evaporator at a point above the surface of the sump 12.  The hydrogen charged with evaporatable constituents flows through pipe 15 to be mixed in device 16 with liquid from 51 fed via heater 17, the mixture returning through pipe 18 to the evaporator.  Liquid from 5 is similarly mixed with hydrogen.  The vapour-gas mixture from 5 ascends through grid-like tray 22 and layer of finely divided catalyst 23 (inserted through aperture 24) and is finally conveyed through pipe 25 to a heater prior to separation of hydrogen (for return through pipe 10) from condensable constituents in a reaction chamber.  The temperature of the catalyst layer during operation corresponds with that of the gas-vapour mixture flowing therethrough.