Catalyst and process for conversion of hydrocarbons
AssigneeAtlantic Richfield Company
InventorsJin S. Yoo, John A. Jaecker
Life of this patent
Estimating the term…
Abstract
An improved process for converting hydrocarbons using a catalyst which is periodically regenerated to remove carbonaceous deposits, the catalyst being comprised of a mixture containing, as a major component, solid particles capable of promoting hydrocarbon conversion at hydrocarbon conversion conditions, and, as a minor component, discrete entities comprising at least one alkaline earth metal-containing spinel, and at least one rare earth metal component associated with the spinel; thereby reducing the amount of sulfur oxides exiting the catalyst regeneration zone. Improved hydrocarbon conversion catalysts are also disclosed.
Claims56
In a hydrocarbon conversion process for converting a sulfur-containing hydrocarbon feedstock which comprises (1) contacting said feedstock with solid particles capable of promoting the conversion of said feedstock at hydrocarbon conversion conditions in at least one reaction zone to produce at least one hydrocarbon product and to cause deactivating sulfur-containing carbonaceous material to be formed on said solid particles thereby forming deposit-containing particles;
- (2) contacting said deposit-containing particles with an oxygen-containing vaporous medium at conditions to combust at least a portion of said carbonaceous deposit material in at least one regeneration zone to thereby regenerate at least a portion of the hydrocarbon conversion catalytic activity of said solid particles and to form a regeneration zone flue gas containing sulfur trioxide;
- and (3) repeating steps (1) and (2) periodically, the improvement which comprises:
- using, in intimate admixture with said solid particles, a minor amount of discrete entities having a composition different from said solid particles and comprising at least one alkaline earth metal-containing spinel including alkaline earth metal and a second metal having a valence higher than the valence of said alkaline earth metal, the atomic ratio of said alkaline earth metal to said second metal in said spinel being at least about 0.25 and said spinel having a surface area in the range of about 25 m.sup.2 /gm. to about 600 m.sup.2 /gm., and a minor amount of at least one rare earth metal component, said discrete entities being present in an amount sufficient to reduce the amount of sulfur oxides in said flue gas.
In a process for combusting solid, sulfur-containing material by contacting said material with a gaseous oxygen in a combustion zone at combustion conditions to produce combustion products including at least one sulfur oxide, the improvement comprising carrying out said contacting in the presence of discrete particles containing an alkaline earth metal-containing spinel including alkaline earth metal and a second metal having a valence higher than the valence of said alkaline earth metal, the atomic ratio of said alkaline earth metal to said second metal in spinel being at least about 0.25 and said spinel has a surface area in the range of about 25 m.sup.2 /gm. to about 600 m.sup.2 /gm., and a minor amount of at least one rare earth metal component, thereby reducing the amount of sulfur oxide emitted from said combustion zone.
In a hydrocarbon conversion process for converting a sulfur-containing hydrocarbon feedstock which comprises (1) contacting said feedstock with solid particles capable of promoting the conversion of said feedstock at hydrocarbon conversion conditions in at least one reaction zone to produce at least one hydrocarbon product and to cause deactivating sulfur-containing carbonaceous material to be formed on said solid particles thereby forming deposit-containing particles;
- (2) contacting said deposit-containing particles with an oxygen-containing vaporous medium at conditions to combust at least a portion of said carbonaceous deposit material in at least one regeneration zone to thereby regenerate at least a portion of the hydrocarbon conversion catalytic activity of said solid particles and to form a regeneration zone flue gas containing sulfur trioxide;
- and (3) repeating steps (1) and (2) periodically, the improvement which comprises:
- using, in intimate admixture with said solid particles, a minor amount of discrete entities having a composition different from said solid particles and comprising a major amount of at least one alkaline earth metal-containing spinel including alkaline earth metal and a second metal having a valence higher than the valence of said alkaline earth metal, the atomic ratio of said alkaline earth metal to said second metal in said spinel being at least about 0.25, and a minor amount of at least one rare earth metal component, said discrete entities being present in an amount sufficient to reduce the amount of sulfur oxides in said flue gas.
In a process for combusting solid, sulfur-containing material by contacting said material with a gaseous oxygen in a combustion zone at combustion conditions to produce combustion products including at least one sulfur oxide, the improvement comprising carrying out said contacting in the presence of discrete particles containing a major amount of an alkaline earth metal-containing spinel including alkaline earth metal and a second metal having a valence higher than the valence of said alkaline earth metal, the atomic ratio of said alkaline earth metal to said second metal in spinel being at least about 0.25, and a minor amount of at least one rare earth metal component, thereby reducing the amount of sulfur oxide emitted from said combustion zone.
Dependencies are inferred from the claim text.