Chemistry: fischer-tropsch processes; or purification or recover – Plural zones each having a fischer-tropsch reaction – Diverse catalysts utilized in at least two zones
Reexamination Certificate
2007-06-05
2007-06-05
Parsa, J. (Department: 1621)
Chemistry: fischer-tropsch processes; or purification or recover
Plural zones each having a fischer-tropsch reaction
Diverse catalysts utilized in at least two zones
C518S706000, C518S715000, C518S717000
Reexamination Certificate
active
11242726
ABSTRACT:
The invention relates to an integrated process for producing liquid fuels, the process comprising the steps of:a) subjecting syngas with a hydrogen/carbon monoxide ratio between about 0.5 to 2.0 to Fischer-Tropsch reaction conditions in the presence of a first catalyst;b) optionally removing water and/or heavy hydrocarbons from the product stream; andc) subjecting the product from step a) or b) together with syngas of a hydrogen/carbon monoxide ratio higher than that of step a) or hydrogen to Fischer-Tropsch reaction conditions at higher temperatures than during step a) in the presence of a second catalyst, said second catalyst being selected such as to provide a higher activity than said first catalyst; wherein said first catalyst is selected such as to provide low methane selectivity and high olefins and heavy hydrocarbons selectivity. According to the invention, a third synthesis step or additional synthesis steps is added subsequent to the synthesis step c).
REFERENCES:
patent: 2149515 (1939-03-01), Fischer
patent: 6331573 (2001-12-01), Kibby
patent: 2003/0217249 (2003-11-01), Postiff et al.
patent: 515 037 (1939-11-01), None
patent: 631 682 (1949-11-01), None
Karimi Ali
Kodadadi Abas Ali
Mortazavi Yadollah
Sharifnia Shahram
Tavasoli Ahmad
Kenyon & Kenyon LLP
Parsa J.
Research Institute Petroleum Industry (RIPI)
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