Chemistry of hydrocarbon compounds – Aromatic compound synthesis – By ring formation from nonring moiety – e.g. – aromatization,...
Reexamination Certificate
2000-04-25
2002-07-09
Griffin, Steven P. (Department: 1754)
Chemistry of hydrocarbon compounds
Aromatic compound synthesis
By ring formation from nonring moiety, e.g., aromatization,...
C585S651000
Reexamination Certificate
active
06417421
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a composition which can be used for converting a hydrocarbon to a C
6
to C
8
aromatic hydrocarbon and an olefin, to a process for producing the composition, and to a process for using the composition for converting a hydrocarbon to a C
6
to C
8
aromatic hydrocarbon and an olefin.
BACKGROUND OF THE INVENTION
It is well known to those skilled in the art that aromatic hydrocarbons and olefins are each a class of very important industrial chemicals which find a variety of uses in petrochemical industry. It is also well known to those skilled in the art that catalytically cracking gasoline-range hydrocarbons produces lower olefins such as, for example, propylene; and aromatic hydrocarbons such as, for example, benzene, toluene, and xylenes (hereinafter collectively referred to as BTX) in the presence of catalysts which contain a zeolite. The product of this catalytic cracking process contains a multitude of hydrocarbons including unconverted C
5
+ alkanes; lower alkanes such as methane, ethane, and propane; lower alkenes such as ethylene and propylene; C
6
-C
8
aromatic hydrocarbons; and C
9
+ aromatic compounds which contain 9 or more carbons per molecule. However, the conversion of relatively low value hydrocarbons such as those having 5-6 carbons per molecule to more valuable petrochemical products is not as high as one skilled in the art desires. Therefore, development of a catalyst and a process for converting hydrocarbons to the more valuable olefins and BTX and would be a significant contribution to the art and to the economy.
SUMMARY OF THE INVENTION
An object of this invention is to provide a catalyst composition which can be used to convert a hydrocarbon to a C
6
to C
8
aromatic hydrocarbon and an olefin. Also an object of this invention is to provide a process for producing the catalyst composition. Another object of this invention is to provide a process which can employ the catalyst composition to convert a hydrocarbon to an olefin and a C
6
to C
8
aromatic hydrocarbon. An advantage of the catalyst composition is that it enhances the production of olefins and BTX. Other objects and advantages will becomes more apparent as this invention is more fully disclosed hereinbelow.
According to a first embodiment of the present invention, a composition which can be used as a catalyst for converting a hydrocarbon or a hydrocarbon mixture to an olefin and a C
6
to C
8
aromatic hydrocarbon is provided. The composition comprises an acid-leached zeolite, and at least one metal or element selected from the group consisting of Group IA, Group IIA, Group IIIA, Group IVA, Group VA, Group IIB, Group IIIB, Group IVB, Group VIB, of the CAS version of the Periodic Table of the Elements, CRC Handbook of Chemistry and Elements, 74th edition, 1993-1994 (CRC Press, Boca Raton, Fla.), and combinations of two or more thereof.
According to a second embodiment of the present invention, a process which can be used for producing a catalyst composition is provided. The process comprises the steps: (1) optionally contacting a zeolite which can comprise a binder with steam whereby a steamed zeolite is formed; (2) optionally contacting a zeolite or the steamed zeolite with an acid in an amount and under a condition effective to produce an acid-leached zeolite; (3) combining a zeolite, which can also be the steamed zeolite or the acid-leached zeolite, with a first promoter under a condition sufficient to incorporate the zeolite with the first promoter to produce a first promoted zeolite; (4) optionally heat-treating the first promoter zeolite to produce a heat-treated, first promoted zeolite; (5) incorporating a second promoter into the first promoted zeolite to produce a second promoted zeolite; and (6) heat-treating the second promoted zeolite wherein the first promoter or the second promoter is a metal or compound selected from the group consisting of Group IA, Group IIA, Group IIIA, Group IVA, Group VA, Group IIB, Group IIIB, Group IVB, Group VIB, of the CAS version of the Periodic Table of the Elements, CRC Handbook of Chemistry and Elements, 74th edition, 1983-1994 (CRC Press, Boca Raton, Fla.), and combinations of two or more thereof.
According to a third embodiment of the present invention, a process which can be used for converting a hydrocarbon or a hydrocarbon mixture to an olefin and a C
6
to C
8
aromatic hydrocarbon is provided which comprises, consists essentially of, or consists of, contacting a fluid which comprises a hydrocarbon or a hydrocarbon mixture with a catalyst composition, which can be the same as disclosed above in the first embodiment of the invention, under a condition effective to convert a hydrocarbon to an olefin and an aromatic hydrocarbon containing 6 to 8 carbon atoms per molecule wherein the production of the olefins and aromatic compounds is enhanced.
DETAILED DESCRIPTION OF THE INVENTION
According to the first embodiment of the present invention the weight ratio of binder to zeolite can be any ratio that can enhance the production of olefin and C
6
-C
8
aromatic compounds from a hydrocarbon and can be in the range of from about 1:20 to about 20:1, preferably about 1:10 to about 10:1, and most preferably about 1:7 to about 5:1. The composition can also comprise, consist essentially of, or consist of, a zeolite, a binder, and at least two promoters selected from the group consisting of Group IA, Group IIA, Group IIIA, Group IVA, Group VA, Group IIB, Group IIIB, Group IVB, Group VIB, of the Periodic Table of the Elements, and combinations of two or more thereof. The term “promoter” refers to a compound, a metal, or an element that, when incorporated in a zeolite, can enhance olefin and C
6
-C
8
aromatic hydrocarbon production in a hydrocarbon conversion process. The term “metal or element” used herein also includes a compound of the metal or element. For the interest of simplicity, any references to “metal” in the application, unless otherwise indicated, will include the elements listed above and a compound of any of the elements.
The weight ratio of each promoter to zeolite can be any ratio as long as the ratio can enhance the production of an olefin and a C
6
-C
8
aromatic compound during a hydrocarbon conversion process. Generally, the ratio can be in the range of from about 0.001:1 to about 1:1, preferably about 0.003:1 to about 1:1, and most preferably 0.005:1 to 0.5:1. The weight ratio of one promoter to the other promoter can be in the range of from about 0.01:1 to about 1:0.01.
Any binders known to one skilled in the art for use with a zeolite are suitable for use herein. Examples of suitable binders include, but are not limited to, aluminas such as for example &agr;-alumina and &ggr;-alumina; silicas; alumina-silica; aluminum phosphate; aluminum chlorohydrate; clays such as kaolinite, halloysite, vermiculite, chlorite, attapulgite, smectite, montmorillonite, illite, saconite, sepiolite, palygorskite, and combinations of any two or more thereof; and combinations of two or more thereof. Because these binders are well known to one skilled in the art, description of which is omitted herein. The presently preferred binder, if employed, is alumina because it is readily available.
According to the present invention, any metals or compound containing a metal or element selected from the group consisting of Group IA, Group IIA, Group IIIA, Group IVA, Group VA, Group IIB, Group IIIB, Group IVB, Group VIB, of the Periodic Table of the Elements, and combinations of two or more thereof can be used as promoter. Illustrated hereinbelow are some examples of suitable promoters.
Any Group IIB metals or compounds which can, when incorporated into a zeolite, enhance a hydrocarbon conversion reaction can be used in the present invention. Examples of suitable Group IIB metals or compounds include, but are not limited to, zinc, zinc oxide, zinc titanate, zinc silicate, zinc borate, zinc fluorosilicate, zinc fluorotitanate, zinc molybdate, zinc chromate, zinc tungstate, zinc zirconate, zinc chromite, zinc alumi
Nguyen Cam N.
Phillips Petroleum Company
Sun Hsiang-ning
LandOfFree
Hydrocarbon conversion catalyst composition and process... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydrocarbon conversion catalyst composition and process..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrocarbon conversion catalyst composition and process... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2816881