Chemistry of hydrocarbon compounds – Aromatic compound synthesis – By ring formation from nonring moiety – e.g. – aromatization,...
Reexamination Certificate
2000-02-23
2001-04-17
Griffin, Steven P. (Department: 1754)
Chemistry of hydrocarbon compounds
Aromatic compound synthesis
By ring formation from nonring moiety, e.g., aromatization,...
C585S407000, C585S417000, C502S060000, C502S063000, C502S064000, C502S071000, C502S077000, C502S080000
Reexamination Certificate
active
06218590
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to an improved process for converting non-aromatic hydrocarbons in the presence of an improved zeolite material to aromatic and lower olefin hydrocarbons preferably with a low rate of coke formation during the conversion of such hydrocarbons in the presence of such improved zeolite material.
It is known to catalytically crack non-aromatic gasoline boiling range hydrocarbons (in particular paraffin and olefins) to lower olefins (such as ethylene and propylene) and aromatic hydrocarbons (such as benzene, toluene, and xylenes) in the presence of catalysts which contain a zeolite (such as ZSM-5), as is described in an article by N. Y. Chen et al in Industrial & Engineering Chemistry Process Design and Development, Volume 25, 1986, pages 151-155. The reaction product of this catalytic cracking process contains a multitude of hydrocarbons such as unconverted C
5
+ alkanes, lower alkanes (methane, ethane, propane), lower alkenes (ethylene and propylene), C
6
-C
8
aromatic hydrocarbons (benzene, toluene, xylenes, and ethylbenzene), and C
9
+ aromatic hydrocarbons. Depending upon the relative market prices of the individual reaction products, it can be desirable to increase the yield of certain of the more valuable products relative to the others.
One concern with the use of zeolite catalysts in the conversion of hydrocarbons to aromatic hydrocarbons and lower olefins is the excessive production of coke during the conversion reaction. Coke formed during the zeolite catalyzed aromatization of hydrocarbons tends to cause catalyst deactivation. It is desirable to improve processes for the aromatization of hydrocarbons and the formation of lower olefins from hydrocarbons by minimizing the amount of coke formed during such processes. It is also desirable to have a zeolite catalyst that is useful in producing significant quantities of the aromatic and olefin conversion products.
SUMMARY OF THE INVENTION
It is an object of this invention to at least partially convert hydrocarbons to ethylene, propylene and BTX (benzene, toluene, xylene and ethylbenzene) aromatics.
A further object of this invention is to provide an improved process for the conversion of hydrocarbons in which the rate of coke formation during such conversion of hydrocarbons is minimized.
A yet further object of this invention is to provide an improved zeolite material which when used in the conversion of hydrocarbons results in less coke formation than alternative zeolite materials.
A still further object of this invention is to provide an improved zeolite material that gives an improved yield of lower olefins and BTX aromatics when utilized in the conversion of hydrocarbons.
Another object of this invention is to provide hydrocarbon conversion processes which have an acceptably low coke production rate and/or which produces a conversion product containing suitable quantities of olefins and BTX aromatics.
Another further object of this invention is to provide a method for making an improved zeolite material having such desirable properties as providing for lower coke production and favorable production of olefins and BTX aromatics when used in the conversion of hydrocarbons.
The inventive composition is a mixture comprising a zeolite and zinc spinel wherein the mixture has been treated with a reducing gas under higher temperature conditions. The inventive composition may be made by combining a zeolite with zinc spinel to form a mixture and thereafter exposing the mixture with a reducing gas under high temperature conditions thereby forming the inventive composition. The inventive composition may be used in the conversion of non-aromatic hydrocarbons to aromatic hydrocarbons and lower olefins by contacting under conversion conditions a hydrocarbon feedstock with the inventive composition.
REFERENCES:
patent: 3140253 (1964-07-01), Plank et al.
patent: 3760024 (1973-09-01), Cattanach
patent: 3960978 (1976-06-01), Givens et al.
patent: 4021502 (1977-05-01), Plank et al.
patent: 4157293 (1979-06-01), Plank et al.
patent: 4263020 (1981-04-01), Eberly et al.
patent: 4267072 (1981-05-01), Vasalos
patent: 4423019 (1983-12-01), Bertolacini et al.
patent: 4720602 (1988-01-01), Chu
patent: 4935573 (1990-06-01), Aufdembrink et al.
patent: 4937058 (1990-06-01), Dupin et al.
patent: 5135898 (1992-08-01), Le Van mao et al.
patent: 5316991 (1994-05-01), Subramaniane et al.
patent: 5328675 (1994-07-01), Vaughan et al.
patent: 5580534 (1996-12-01), Hartweg et al.
patent: 5641393 (1997-06-01), Nakagawa
patent: 5856608 (1999-01-01), Wu et al.
patent: 5883033 (1999-03-01), Drake et al.
patent: 5886744 (1999-02-01), Wu et al.
patent: 5895828 (1999-04-01), Yao et al.
patent: 7-29948 (1995-04-01), None
Drake Charles A.
Kimble James B.
Yao Jianhua
Anderson Jeffrey R.
Griffin Steven P.
Nguyen Cam N.
Phillips Petroleum Company
Stewart Charles W.
LandOfFree
Zeolite material, a method of making such improved zeolite... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Zeolite material, a method of making such improved zeolite..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zeolite material, a method of making such improved zeolite... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2466765