Method for improving the Fischer-Tropsch Synthesis product distribution
AssigneeMobil Oil Corporation
InventorsHenry R. Ireland, Thomas R. Stein
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Abstract
The product of Fischer-Tropsch Synthesis is separated to recover a product boiling above about 400.degree. F which is thereafter processed over a selective crystalline zeolite under hydrodewaxing conditions promoting the formation of fuel oil and gasoline products. Improving start up and operation of the process in the presence of a ZSM5 crystalline zeolite is described.
Claims5
In a process for hydrodewaxing a Fischer-Tropsch decant oil fraction boiling in the range of 400.degree. F. to about 1000.degree. F. wherein the heavy oil fraction is contacted in the presence of hydrogen with a crystalline zeolite catalyst having a pore diameter greater than about 5 Angstroms;
- a silica-to-alumina ratio of at least 12;
- a constraint index within the range of 1 to 12;
- the method for improving the catalyst selectivity and aging rate during said operation which comprises preconditioning said catalyst by,
- a. heating the catalyst gradually with hydrogen at 800.degree. F. for two hours at a pressure of about 500 psig,
- b. sulfiding the hydrogen treated catalyst at a temperature within the range of 500.degree. to 750.degree. F.,
- c. contacting the sulfided catalyst with a steam-hydrogen mixture at 800.degree. F for 24 hours, and
- d. reducing the temperature of the steam treated catalyst to about 500.degree. F before initially contacting the oil charge therewith under hydrodewaxing conditions.
Dependencies are inferred from the claim text.