On-line synthesis and regeneration of a catalyst used in autothermal oxidation
AssigneeDow Global Technologies LLC
InventorsSameer S. Bharadwaj, Joseph J. Maj, Jonathan H. Siddall
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Abstract
An on-line method of synthesizing or regenerating catalysts for autothermal oxidation processes, specifically, the oxidation of paraffinic hydrocarbons, for example, ethane, propane, and naphtha, to olefins, for example, ethylene and propylene. The catalyst comprises a Group 8B metal, for example, a platinum group metal and, optionally, a promoter, such as tin, antimony, or copper, on a support, preferably a monolith support. On-line synthesis or regeneration involves co-feeding a volatile Group 8B metal compound and/or a volatile promoter compound with the paraffinic hydrocarbon and oxygen into the oxidation reactor under ignition or autothermal conditions.
Claims26
A process of synthesizing or regenerating an oxidation catalyst on-line, the catalyst comprising at least one Group 8B metal and, optionally, at least one promoter on a support, the catalyst being used on-line in a process wherein a paraffinic hydrocarbon or mixture thereof is contacted with oxygen in the presence of the catalyst in an oxidation reactor under autothermal process conditions sufficient to prepare an olefin, the synthesis or regeneration comprising co-feeding a volatile Group 8B metal compound and/or a volatile promoter compound with the paraffinic hydrocarbon and oxygen feedstream into the oxidation reactor under ignition or autothermal process conditions.
A process of synthesizing an oxidation catalyst on-line, the catalyst comprising at least one Group 8B metal and, optionally, at least one promoter on a support, the catalyst being used on-line in a process wherein a paraffinic hydrocarbon or mixture thereof is contacted in a reactant feedstream with oxygen in the presence of the catalyst in an oxidation reactor under autothermal process conditions sufficient to prepare an olefin, the synthesis comprising co-feeding at least one volatile Group 8B metal compound and, optionally, at least one volatile promoter compound with the reactant feedstream into the oxidation reactor, wherein the Group 8B metal compound and, optionally, the promoter compound contact a blank catalyst support under ignition conditions and are converted into the corresponding Group 8B metal and promoter, thereby forming the catalyst.
A process of regenerating a deactivated or partially deactivated oxidation catalyst on-line, the catalyst comprising at least one Group 8B metal and, optionally, at least one promoter on a support, the catalyst being used on-line in a process wherein a paraffinic hydrocarbon or mixture thereof is contacted in a reactant feedstream with oxygen in the presence of the catalyst in an oxidation reactor under autothermal process conditions sufficient to prepare an olefin, the regeneration comprising co-feeding at least one volatile Group 8B metal compound and/or at least one volatile promoter compound with the reactant feedstream into the oxidation reactor wherein the Group 8B metal compound and/or the promoter compound contact the deactivated catalyst under ignition conditions or contact the partially deactivated catalyst under autothermal conditions sufficient to convert the Group 8B metal compound and/or promoter compound into the corresponding Group 8B metal and/or promoter, thereby regenerating the catalyst.
Dependencies are inferred from the claim text.