On-line synthesis and regenerating of a catalyst used in autothermal oxidation
AssigneeThe Dow Chemical Company
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.
Claims22
An improved process of preparing an olefin wherein a paraffinic hydrocarbon having from 2 to about 25 carbons atoms or mixture thereof is contacted with oxygen in the presence of a catalyst comprising at least one Group 8B metal, and optionally, at least one promoter metal or metal ion on a support, the contacting being conducted under autothermal process conditions sufficient to prepare the olefin in a reactor, wherein the improvement comprises simultaneously co-feeding into the reactor with the paraffinic hydrocarbon and oxygen, a volatile Group 8B metal compound, and optionally, a volatile promoter, compound continuously or intermittently so as to regenerate the catalyst on-line.
Dependencies are inferred from the claim text.