B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
252/87
B01J 25/04 (2006.01) B01J 23/96 (2006.01) B01J 37/00 (2006.01) C10G 35/085 (2006.01)
Patent
CA 1220777
Abstract Reforming catalysts and other hydrocarbon conversion catalyst containing a platinum group compo- nent on a porous inorganic oxide base, such as alu- mina, which catalyst have become inactivated by carbo- naceous deposits in a fixed bed hydrocarbon reforming system having sulfur-contaminated vessels and/or conduits in the flow path upstream from the catalyst beds are regenerated in situ without diversion of the flow stream of the regenerative gas, such as by expensive high pressure valves. Prior to removal of carbonaceous material from the catalyst, metal sulfides in the metal surface of the portion of the processing apparatus upstream of the first reactor are converted in a separate oxida- tion step to sulfur dioxide, SO2, without substantial oxidation to sulfur trioxide, SO3, This is done by maintaining a low water vapor concentration of not more than about 0.1 mol percent in the oxygen contain- ing regenerating gas so that sulfur dioxide released into the regenerating gases by conversion of metal sulfides to metal oxides occurs without excess oxygen or water vapor being present in the effluent gas which passes through the catalyst; preferably, such sulfur removal step is performed at a temperature of from about 750°F to 1100°F. After the sulfur content of the effluent gas from such conduits and vessels is reduced to substantially zero at temperatures of up to abut 1100°F, the gas temperature is reduced to less than about 800°F and the oxygen content increased to decoke the catalyst. By removal of substantially all sulfides before such catalyst regeneration, complete regeneration of the catalylst is facilitated for subsequent redispersion of the metal components. Sulfur trioxide formation is suppressed by absence of sulfur dioxide in the presence of water in the cata- lyst bed and a resulting reaction to sulfate in the catalyst base is avoided. Such sulfate interferes with redispersion of platinum on reforming catalyst or maintaining alkali, or alkaline earth, metal compo- nents on zeolite surfaces.
456114
Chevron Research And Technology Company
Smart & Biggar
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