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US 12,286,595 B2Granted
Use of high halide-containing catalyst in front reactors to extend the life and selectivity of reforming catalyst
AssigneeChevron Philips Chemical Company LP
InventorsCori A. Demmelmaier-Chang, Joseph Bergmeister, III, Vincent D. McGahee, Gabriela D. Alvez-Manoli
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Abstract
This disclosure provides processes for reforming hydrocarbons by using a series of adiabatic reactors and catalysts, in which the catalyst(s) in at least one front or upstream catalyst bed or reactor includes a higher fluoride concentration, higher chloride concentration, or both than the respective halide concentrations in the catalysts in one or more downstream catalyst beds or reactors, which has been unexpectedly discovered to extend the useful life and/or the selectivity of the catalyst system.
Claims28
A process for reforming hydrocarbons comprising:
- a) in a first catalyst bed, contacting a feedstock containing aliphatic hydrocarbons with a first catalyst comprising an inorganic support, a Group 8-10 metal, and from about 1.0 wt % to about 5.0 wt % fluoride relative to the weight of the first catalyst prior to reduction, under conditions for aromatizing aliphatic hydrocarbons to form a first catalyst bed discharge comprising aromatic hydrocarbons and aliphatic hydrocarbons;
- b) in one or more intermediate catalyst beds in series, contacting the first catalyst bed discharge with one or more independently selected intermediate catalysts, each comprising an inorganic support, a Group 8-10 metal, and fluoride, under conditions for aromatizing aliphatic hydrocarbons to form one or more intermediate catalyst bed discharges comprising aromatic hydrocarbons and aliphatic hydrocarbons;
- and
- c) in a last catalyst bed, contacting the one or more intermediate catalyst bed discharges with a last catalyst comprising an inorganic support, a Group 8-10 metal, and from about 0.7 wt % to about 4.0 wt % fluoride relative to the weight of the last catalyst prior to reduction, under conditions for aromatizing aliphatic hydrocarbons to form a last catalyst bed discharge comprising aromatic products;
- wherein the fluoride concentration of the first catalyst or the fluoride concentration of at least one of the intermediate catalysts is greater than the fluoride concentration of the last catalyst prior to reduction.
2 more elements
A catalytic hydrocarbon reforming system comprising:
- at least three catalyst beds in series, including an upstream first catalyst bed, a downstream last catalyst bed, and one or more intermediate catalyst beds in series between the first catalyst bed and the last catalyst bed;
- a first catalyst in the first catalyst bed comprising an inorganic support, a Group 8-10 metal, and from about 1.0 wt % to about 5.0 wt % fluoride relative to the weight of the first catalyst prior to reduction;
- one or more independently selected intermediate catalysts in the one or more intermediate catalyst beds, each intermediate catalyst comprising an inorganic support, a Group 8-10 metal, and fluoride;
- and
- a last catalyst in the last catalyst bed comprising an inorganic support, a Group 8-10 metal, and from about 0.7 wt % to about 4.0 wt % fluoride relative to the weight of the last catalyst prior to reduction;
- wherein the fluoride concentration of the first catalyst or the fluoride concentration of at least one of the intermediate catalysts is greater than the fluoride concentration of the last catalyst prior to reduction.
3 more elements
A process for reforming hydrocarbons comprising:
- a) in a first catalyst bed, contacting a feedstock containing aliphatic hydrocarbons with a first catalyst comprising an inorganic support, a Group 8-10 metal, and at least or about 1.0 wt % fluoride relative to the weight of the first catalyst prior to reduction, under conditions for aromatizing aliphatic hydrocarbons to form a first catalyst bed discharge comprising aromatic hydrocarbons and aliphatic hydrocarbons;
- and
- b) in a last catalyst bed, contacting the first catalyst bed discharge with a last catalyst comprising an inorganic support, a Group 8-10 metal, and at least or about 0.7 wt % fluoride relative to the weight of the last catalyst prior to reduction, under conditions for aromatizing aliphatic hydrocarbons to form a last catalyst bed discharge comprising aromatic products;
- wherein the fluoride concentration of the first catalyst is greater than the fluoride concentration of the last catalyst prior to reduction.
1 more element
A catalytic hydrocarbon reforming system comprising:
- two catalyst beds in series, including an upstream first catalyst bed and a downstream last catalyst bed;
- a first catalyst in the first catalyst bed comprising an inorganic support, a Group 8-10 metal, and at least or about 1.0 wt % fluoride relative to the weight of the first catalyst prior to reduction;
- and
- a last catalyst in the last catalyst bed comprising an inorganic support, a Group 8-10 metal, and at least or about 0.7 wt % fluoride relative to the weight of the last catalyst prior to reduction;
- wherein the fluoride concentration of the first catalyst is greater than the fluoride concentration of the last catalyst prior to reduction.
2 more elements
Dependencies are inferred from the claim text.