Catalyst treatment useful for aromatics conversion process
AssigneeUop LLC
InventorsEdwin P. Boldingh, Antoine Negiz
Life of this patent
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Abstract
A process for preparing a transalkylation catalyst, the catalyst itself, and a transalkylation process for using the catalyst are herein disclosed. The catalyst comprises rhenium metal on a solid-acid support such as mordenite, which has been treated with a sulfur-based agent. Such treatment reduces the amount of methane produced by metal hydrogenolysis in a transalkylation process wherein heavy aromatics like A9+ are reacted with toluene to produce xylenes. Reduced methane production relative to total light ends gas production results in lower hydrogen consumption and lower reactor exotherms.
Claims14
A process for preparing a transalkylation catalyst comprising contacting the catalyst comprising a rhenium component, an optional binder, and a solid-acid component with a reducing agent under substantially dry reducing conditions effective for decreasing yields of methane under transalkylation conditions, wherein the reducing conditions include a temperature greater than about 350° C. to form a catalyst consisting essentially of a rhenium component, an optional binder, and a solid-acid component wherein the solid-acid component is selected from the group consisting of:
- (A) mordenite having a SiO2/Al2O3 ratio from about 20 to about 40, mazzite, ZSM-12, EU-1, SAPO-5, mixtures thereof,
- (B) ZSM-11 in combination with at least one of mordenite having a SiO2/Al2O3 ratio from about 20 to about 40, mazzite, ZSM-12, ZSM-22, ZSM-23, EU-1, MAPO-36, MAPSO-31, SAPO-5, SAPO-11, or SAPO-41 and
- (C) MFI topology zeolite in combination with at least one of mordenite having a SiO2/Al2O3 ratio from about 20 to about 40, mazzite, ZSM-12, ZSM-22, ZSM-23, EU-1, MAPO-36, MAPSO-31, SAPO-5, SAPO-11, or SAPO-41.
A process for converting a hydrocarbon feed comprising C9+ aromatic compounds and toluene compounds, the process comprising the step of contacting the feed with a transalkylation catalyst under transalkylation conditions, wherein the transalkylation catalyst consists essentially of a rhenium component, an optional binder, and a solid-acid component, wherein the transalkylation catalyst is characterized by undergoing at least one substantially dry reduction step under reduction conditions including a temperature of greater than about 350° C. and a moisture level of less than about 20 wt-ppm water and a time period of from about 30 minutes to about 24 hours and wherein the solid-acid component is selected from the group consisting of:
- (A) mordenite having a SiO2/Al2O3 ratio from about 20 to about 40, mazzite, ZSM-12, EU-1, SAPO-5, mixtures thereof,
- (B) ZSM-11 in combination with at least one of mordenite having a SiO2/Al2O3 ratio from about 20 to about 40, mazzite, ZSM-12, ZSM-22, ZSM-23, EU-1, MAPO-36, MAPSO-31, SAPO-5, SAPO-11, or SAPO-4 and
- (C) MFI topology zeolite in combination with at least one of mordenite having a SiO2/Al2O3 ratio from about 20 to about 40, mazzite, ZSM-12, EU-1, SAPO-5, SAPO-11, or SAPO-41.
A catalyst for transalkylation of aromatics consisting essentially of a rhenium component, an optional binder, and a solid-acid component, wherein the catalyst is characterized by undergoing at least one substantially dry reduction step under reduction conditions including a temperature of greater than about 350° C. and a moisture level of less than about 20 wt-ppm water and a time period of from about 30 minutes to about 24 hours and wherein the solid-acid component is selected from the group consisting of:
- (A) mordenite having a SiO2/Al2O3 ratio from about 20 to about 40, mazzite, ZSM-12, EU-1, SAPO-5, mixtures thereof,
- (B) ZSM-11 in combination with at least one of mordenite having a SiO2/Al2O3 ratio from about 20 to about 40, mazzite, ZSM-12, ZSM-22, ZSM-23, EU-1, MAPO-36, MAPSO-31, SAPO-5, SAPO-11, or SAPO-41, and
- (C) MFI topology zeolite in combination with at least one of mordenite having a SiO2/Al2O3 ratio from about 20 to about 40, mazzite, ZSM-12, ZSM-22, ZSM-23, EU-1, MAPO-36, MAPSO-31, SAPO-5, SAPO-11, or SAPO-41.
Dependencies are inferred from the claim text.