Organic compounds -- part of the class 532-570 series – Organic compounds – Fatty compounds having an acid moiety which contains the...
Reexamination Certificate
1999-05-06
2001-05-22
Richter, Johann (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Fatty compounds having an acid moiety which contains the...
C157S001420
Reexamination Certificate
active
06235915
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a catalyst for use in processes for hydrogenating unsaturated hydrocarbon-containing feeds, and more particularly in hydrogenation processes enabling aromatic compounds contained in feeds containing traces of sulfur-containing compounds to be hydrogenated. It also relates to the preparation of this catalyst and to processes using the catalyst.
BACKGROUND OF THE INVENTION
Petroleum cuts must be pre-treated before use to eliminate unwanted compounds and to obtain products which satisfy current regulations. In that context, gas oil cut hydrogenation is of particular importance because of new regulations regarding sulfur and aromatic compound levels imposed for that type of fuel.
Desulfurization is generally carried out under conditions and using catalysts which are not also capable of hydrogenating the aromatic compounds. Thus a second treatment has to be carried out on the cut for which the sulfur content has already been reduced, to hydrogenate the aromatic compounds contained in that cut. This step is generally effected by bringing the cut, in the presence of hydrogen, into contact with a catalyst which is generally based on a noble metal. However, since the desulfurization process can never completely eliminate the sulfur-containing and nitrogen-containing compounds, the catalysts used must be able to operate in the presence of those compounds, which are powerful inhibitors of the activity of noble metals, and they must as a consequence have good thio-resistant properties.
A group of catalysts with thio-resistant properties has already been identified. Platinum and palladium based catalysts have been described in respect of their thio-resistance. When using an alumina type support (U.S. Pat. No. 3,943,053), it is reported that the metal contents and the conditions for preparation must be precisely controlled. This constraint causes distinct problems in terms of flexibility during industrial scale-up for these formulations. The use of supports based on silica-aluminas or zeolites has also been reported. Examples are U.S. Pat. Nos. 4,960,505, 5,308,814 and 5,151,172. Those documents teach that the type of zeolite which can produce the desired properties is highly specific. Further, the use of such supports has a number of major disadvantages, among them their preparation, which includes a forming step requiring the use of mineral binders such as aluminas. The preparation methods thus must allow noble metals to be selectively deposited onto the zeolitic material as opposed to deposit onto the binder, which is an additional restriction with that type of catalyst.
SUMMARY OF THE INVENTION
We have now discovered, and this forms the subject matter of the present invention, a novel catalyst constituted by platinum, palladium, fluorine and/or chlorine, on an alumina support. Such a catalyst can advantageously be used to hydrogenate aromatic compounds in feeds containing sulfur-containing compounds.
In a further aspect, the invention concerns the use of said catalyst, more particularly for treating cycle oils from catalytic cracking processes. However, this catalyst is also suitable for any process aimed at hydrogenating all or a portion of the aromatic compounds in a feed containing traces of sulfur-containing compounds, such as hydrogenating aromatic compounds in edible oils.
REFERENCES:
patent: 3943053 (1976-03-01), Kovach et al.
patent: 5922639 (1999-07-01), Alario
patent: 0 751 204 (1997-01-01), None
Didillon Blaise
Guillon Emmanuelle
Uzio Denis
Faulkner Diedra
Institut Francais du Pe'trole
Millen White Zelano & Branigan P.C.
Richter Johann
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