Mineral oils: processes and products – Paraffin wax; treatment or recovery – Chemical treatment
Reexamination Certificate
2001-02-21
2002-04-30
Sample, David (Department: 1755)
Mineral oils: processes and products
Paraffin wax; treatment or recovery
Chemical treatment
C208S111010, C208S113000, C208S120010, C208S058000, C585S671000, C585S533000, C585S638000, C585S733000, C423S212000, C423S213200, C423S213500, C423S239100, C095S130000
Reexamination Certificate
active
06379531
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to new crystalline zeolite SSZ-52, a method for preparing SSZ-52 using the quaternary ammonium cation templating agent N,N-diethyl-5,8-dimethyl-2-azonium bicyclo[3.2.2]nonane, and processes employing SSZ-52 as a catalyst.
2. State of the Art
Because of their unique sieving characteristics, as well as their catalytic properties, crystalline molecular sieves and zeolites are especially useful in applications such as hydrocarbon conversion, gas drying and separation. Although many different crystalline molecular sieves have been disclosed, there is a continuing need for new zeolites with desirable properties for gas separation and drying, hydrocarbon and chemical conversions, and other applications. New zeolites may contain novel internal pore architectures, providing enhanced selectivities in these processes.
SUMMARY OF THE INVENTION
The present invention is directed to a family of crystalline molecular sieves with unique properties, referred to herein as “zeolite SSZ-52” or simply “SSZ-52”. Preferably, SSZ-52 is obtained in its aluminosilicate form. As used herein, the term “aluminosilicate” refers to a zeolite containing both alumina and silica.
In accordance with this invention, there is provided a zeolite having a mole ratio of about 6-50 of an oxide selected from silicon oxide, germanium oxide and mixtures thereof to an oxide selected from aluminum oxide, gallium oxide, iron oxide, and mixtures thereof and having, after calcination, the X-ray diffraction lines of Table I below.
The present invention further provides such a zeolite having a composition, as synthesized and in the anhydrous state, in terms of mole ratios as follows:
YO
2
/W
2
O
3
6-50
M
2
/YO
2
0.03-0.25
Q/YO
2
0.02-0.08
wherein Y is silicon, germanium or a mixture thereof; W is aluminum, gallium, iron, or mixtures thereof; M is an alkali metal cation, alkaline earth metal cation or mixtures thereof; n is the valence of M (i.e., 1 or 2); and Q is a quaternary ammonium cation having the structure
Template A
The zeolite has, after calcination, the X-ray diffraction lines of Table I below.
In accordance with this invention, there is also provided a zeolite prepared by thermally treating a zeolite having a mole ratio of an oxide selected from silicon oxide, germanium oxide and mixtures thereof to an oxide selected from aluminum oxide, gallium oxide, iron oxide, and mixtures thereof of about 6-50 at a temperature of from about 200° C. to about 800° C., the thus-prepared zeolite having the X-ray diffraction lines of Table I. The present invention also includes this thus-prepared zeolite which is predominantly in the hydrogen form, which hydrogen form is prepared by ion exchanging with an acid or with a solution of an ammonium salt followed by a second calcination.
Also provided in accordance with the present invention is a method of preparing a crystalline material comprising an oxide of a first tetravalent element and an oxide of a second tetravalent element which is different from said first tetravalent element, trivalent element, pentavalent element or mixture thereof, said method comprising contacting under crystallization conditions sources of said oxides and a templating agent comprising Template A.
The present invention additionally provides a process for converting hydrocarbons comprising contacting a hydrocarbonaceous feed at hydrocarbon converting conditions with a catalyst comprising the zeolite of this invention. The zeolite may be predominantly in the hydrogen form. It may also be substantially free of acidity.
Further provided by the present invention is a hydrocracking process comprising contacting a hydrocarbon feedstock under hydrocracking conditions with a catalyst comprising the zeolite of this invention, preferably predominantly in the hydrogen form.
This invention also includes a dewaxing process comprising contacting a hydrocarbon feedstock under dewaxing conditions with a catalyst comprising the zeolite of this invention, preferably predominantly in the hydrogen form.
The present invention also includes a process for improving the viscosity index of a dewaxed product of waxy hydrocarbon feeds comprising contacting the waxy hydrocarbon feed under isomerization dewaxing conditions with a catalyst comprising the zeolite of this invention, preferably predominantly in the hydrogen form.
The present invention further includes a process for producing a C
20+
lube oil from a C
20+
olefin feed comprising isomerizing said olefin feed under isomerization conditions over a catalyst comprising at least one Group VIII metal and the zeolite of this invention. The zeolite may be predominantly in the hydrogen form.
In accordance with this invention, there is also provided a process for catalytically dewaxing a hydrocarbon oil feedstock boiling above about 350° F. and containing straight chain and slightly branched chain hydrocarbons comprising contacting said hydrocarbon oil feedstock in the presence of added hydrogen gas at a hydrogen pressure of about 15-3000 psi with a catalyst comprising at least one Group VIII metal and the zeolite of this invention, preferably predominantly in the hydrogen form. The catalyst may be a layered catalyst comprising a first layer comprising at least one Group VIII metal and the zeolite of this invention, and a second layer comprising an aluminosilicate zeolite which has different shape selectivity than the zeolite of said first layer.
Also included in the present invention is a process for preparing a lubricating oil which comprises hydrocracking in a hydrocracking zone a hydrocarbonaceous feedstock to obtain an effluent comprising a hydrocracked oil, and catalytically dewaxing said effluent comprising hydrocracked oil at a temperature of at least about 400° F. and at a pressure of from about 15 psig to about 3000 psig in the presence of added hydrogen gas with a catalyst comprising at least one Group VIII metal and the zeolite of this invention. The zeolite may be predominantly in the hydrogen form.
Further included in this invention is a process for isomerization dewaxing a raffinate comprising contacting said raffinate in the presence of added hydrogen with a catalyst comprising at least one Group VIII metal and the zeolite of this invention. The raffinate may be bright stock, and the zeolite may be predominantly in the hydrogen form.
Also provided by the present invention is a catalytic cracking process comprising contacting a hydrocarbon feedstock in a reaction zone under catalytic cracking conditions in the absence of added hydrogen with a catalyst comprising the zeolite of this invention, preferably predominantly in the hydrogen form. Also included in this invention is such a catalytic cracking process wherein the catalyst additionally comprises a large pore crystalline cracking component.
The present invention further provides a process for oligomerizing olefins comprising contacting an olefin feed under oligomerization conditions with a catalyst comprising the zeolite of this invention.
There is further provided in accordance with this invention a process for isomerizing olefins comprising contacting an olefin feed under isomerization conditions with a catalyst comprising the zeolite of this invention.
Further provided in accordance with this invention is a process for the production of higher molecular weight hydrocarbons from lower molecular weight hydrocarbons comprising the steps of:
(a) introducing into a reaction zone a lower molecular weight hydrocarbon-containing gas and contacting said gas in said zone under C
2+
hydrocarbon synthesis conditions with a catalyst comprising the zeolite of this invention and a metal or metal compound capable of converting the lower molecular weight hydrocarbon to a higher molecular weight hydrocarbon; and
(b) withdrawing from said reaction zone a higher molecular weight hydrocarbon-containing stream. Preferably, the metal or metal compound is a lanthanide or actinide metal or metal compound and the lower mol
Lee Gregory S.
Zones Stacey I.
Chevron U.S.A. Inc.
Sample David
Sheridan Richard J.
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