Heavy Aromatics Conversion Processes and Catalyst Compositions Used Therein
AssigneeExxonMobil Chemical Patents Inc.
InventorsChristine N. Elias, Wenyih F. Lai, Hari Nair, Joshua I. Cutler, Chuansheng Bai, Nicholas S. Rollman
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Abstract
Disclosed are processes for conversion of a feedstock comprising C8+ aromatic hydrocarbons to lighter aromatic products in which the feedstock and optionally hydrogen are contacted in the presence of the catalyst composition under conversion conditions effective to dealkylate and transalkylate said C8+ aromatic hydrocarbons to produce said lighter aromatic products comprising benzene, toluene and xylene. The catalyst composition comprises a zeolite, a first metal, and a second metal, and is treated with a source of sulfur and/or a source of steam.
Claims26
-25. (canceled)
A process for conversion of a feedstock comprising C8+ aromatic hydrocarbons to lighter aromatic products, the process comprising the step of contacting said feedstock and optionally hydrogen in the presence of a catalyst composition under conversion conditions effective to dealkylate and transalkylate said C8+ aromatic hydrocarbons to produce said lighter aromatic products comprising benzene, toluene and xylene,
- wherein said catalyst composition is treated with a source of sulfur and/or steam and comprises:
- (i) at least one zeolite selected from the group consisting of zeolite beta, ZSM-4, ZSM-5, ZSM-11, ZSM-12, ZSM-20, ZSM-22, ZSM-23, ZSM-35, ZSM-48, ZSM-50, ZSM-57, ZSM-58, MCM-68, a faujasite zeolite, a mordenite zeolite, a MCM-22 family material, or a mixture thereof,
- (ii) 0.001 wt. % to 20.0 wt. % of at least one first metal, said first metal being in Group 6 of the Periodic Table, based on the weight of said catalyst composition, and
- (iii) 0.001 wt. % to 20.0 wt. % of at least one second metal, said second metal being in Group 9 or Group 10 of the Periodic Table, based on the weight of said catalyst composition.
A process for conversion of a feedstock comprising C8+ aromatic hydrocarbons to lighter aromatic products comprising the steps of preparing a treated catalyst composition is by a method comprising the steps of:
- (a) providing a catalyst composition comprising at least one zeolite selected from the group consisting of zeolite beta, ZSM-4, ZSM-5, ZSM-11, ZSM-12, ZSM-20, ZSM-22, ZSM-23, ZSM-35, ZSM-48, ZSM-50, ZSM-57, ZSM-58, MCM-68, a faujasite zeolite, a mordenite zeolite, a MCM-22 family material, or a mixture thereof;
- (b) contacting said catalyst composition with a source of a first metal or compounds thereof and a source of a second metal or compounds thereof to form a metal-containing catalyst composition,
- wherein said first metal is in Group 6 of the Periodic Table,
- wherein said second metal is in Group 9 or Group 10 of the Periodic Table, wherein said metal-containing catalyst composition comprises 0.001 wt. % to 20.0 wt. % of said first metal, and 0.001 wt. % to 20.0 wt. % of said second metal, each weight % based on the weight of the catalyst composition;
- and
- (c) treating said metal-containing catalyst composition with a source of sulfur and/or a source of steam to form said treated catalyst composition,
- contacting said feedstock and optionally hydrogen in the presence of said treated catalyst composition under conversion conditions effective to dealkylate and transalkylate said C8+ aromatic hydrocarbons to produce said lighter aromatic products comprising benzene, toluene and xylene.
A catalyst composition comprising (i) one or more zeolites selected from zeolite beta, ZSM-5, ZSM-12 and mordenite zeolites synthesized from TEA or MTEA, said mordenite zeolites having a mesopore surface area of greater than 30 m2/g and said mordenite zeolites comprising agglomerates composed of primary crystallites, wherein said primary crystallites have an average primary crystal size as measured by TEM of less than 80 nm and an aspect ratio of less than 2, (ii) 0.001 wt. % to 20.0 wt. % of at least one first metal comprising molybdenum or tungsten, based on the weight of the catalyst composition, and (iii) 0.001 wt. % to 20.0 wt. % of at least one second metal comprising cobalt or nickel, based on the weight of the catalyst composition,
- wherein said catalyst composition is treated with a source of sulfur in one or more steps at temperatures in the range 204° C. (400° F.) up to about 480° C. (900° F.) or treated with a source of steam which comprises up to about 100% steam at temperatures in the range of about 260° C. (500° F.) to about 649° C. (1200° F.).
Dependencies are inferred from the claim text.