Chemistry: fischer-tropsch processes; or purification or recover – Including regeneration of catalyst
Reexamination Certificate
1999-09-22
2001-05-29
Richter, Johann (Department: 1621)
Chemistry: fischer-tropsch processes; or purification or recover
Including regeneration of catalyst
C518S708000, C518S715000, C518S702000, C518S703000
Reexamination Certificate
active
06239184
ABSTRACT:
BACKGROUND OF THE INVENTION
Fischer-Tropsch hydrocarbon synthesis catalysts have been studied widely by various researchers recently. This research has been particularly directed to the use of such catalysts in slurry bubble column reactors or ebullated bed reactors. In such reactors the catalyst is finely divided and typically comprises cobalt, ruthenium, or cobalt and ruthenium supported on an inorganic metal oxide support. The catalyst may also contain promoters to enhance the activity or stability of the catalyst.
In the use of such catalysts to produce liquid hydrocarbons the catalysts become deactivated as a result of the presence of water and various contaminants in either synthesis gas or in the reaction medium contacting the catalysts. In some instances such catalysts can be readily regenerated and in other instances this regeneration is somewhat more difficult. In any event a continuing effort has been directed to developing methods for extending the life of catalysts used in Fischer-Tropsch reactions.
SUMMARY OF THE INVENTION
It has now been found that an extended catalyst life process for producing liquid hydrocarbons from a synthesis gas produced by the stoichiometric oxidation of a light hydrocarbon with an oxygen-containing stream comprising air or oxygen-enriched air comprises producing a synthesis gas comprising hydrogen and carbon monoxide by substoichiometric oxidation of a light hydrocarbon gas with air or oxygen-enriched air; adjusting the hydrogen to carbon monoxide ratio in the synthesis gas to a range from about 1.0 to about 5.0; cooling the synthesis gas to a temperature below about 150° F.; separating water from the synthesis gas; reducing the ammonia content of the synthesis gas to a value below about 10 ppmv; and, reacting at least a portion of the synthesis gas in a Fischer-Tropsch process in the presence of a catalyst comprising cobalt, ruthenium, or cobalt and ruthenium supported on an inorganic metal oxide support and a liquid comprising reaction product hydrocarbon liquids to produce liquid hydrocarbons.
The catalyst may be cobalt, ruthenium, or cobalt and ruthenium supported on a metal oxide of Group IIIA, IIIB, IVB, VB, VIB and VIIIB metal oxides, silica, silica-alumina and mixtures thereof.
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“Fischer-Tropsch Synthesis: Differential Reaction Rate Studies with Cobalt Catalyst”; R.B. Anderson, A. Krieg, R.A. Friedel and L.S. Mason,Industrial and Engineering Chemistry, Oct., 1949, pp. 2189-2197.
Beer Gary L.
Briscoe Michael D.
Leahy James F.
Lisewsky Greg A.
McHugh Kernan J.
Baker & Botts L.L.P.
Parsa J.
Richter Johann
Syntroleum Corporation
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