US 2006/0079586 A1Published application

Integrated process and apparatus for producing liquid fuels

AssigneeResearch Institute of Petroleum Industry (RIPI)

InventorsAhmad Tavasoli, Ali Karimi, Kambiz Zadeh, Abas Kodadadi, Yadollah Mortazavi, Shahram Sharifnia

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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; and c) 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).

Claims22

Dependent claims

An integrated process for producing liquid fuels, the process comprising:

subjecting syngas with a hydrogen/carbon monoxide ratio of 0.5 to 2.0 to Fischer-Tropsch reaction conditions at pressures in the range of 10 bar and 40 bar and temperatures in the range of 180° C. and 220° C. in one of a slurry reactor and a fixed-bed reactor charged with a first catalyst, which catalyst is an alkali-promoted cobalt-based catalyst;
a) optionally removing at least one of water and heavy hydrocarbons from the product stream;
b) subjecting the product from one of step a) and step b) together with one of syngas of a hydrogen/carbon monoxide ratio higher than that of step a) and hydrogen to Fischer-Tropsch reaction conditions at pressures in the range between 10 bar and 40 bar and temperatures in the range of 200° C. and 250° C. in a slurry reactor or fixed-bed reactor charged with a second catalyst, said second catalyst being a promoted cobalt-based catalyst having a higher activity than said first catalyst;
c) optionally removing at least one of water and liquid hydrocarbons from the product stream of c);
and
d) subjecting the product from one of step c) and d) together with syngas to Fischer-Tropsch reaction conditions at pressures in the range between 10 bar and 40 bar and temperatures in the range of 200° C. and 250° C. in the presence of a third catalyst, said third catalyst being a promoted cobalt-based catalyst having a higher activity than at least said first catalyst.

3 more elements

An apparatus for performing an integrated process for producing liquid fuels, said apparatus comprising:

a first reactor, wherein syngas with a hydrogen/carbon monoxide ratio between about 0.5 to 2.0 is subjected to Fischer-Tropsch reaction conditions at pressures in the range between 10 bar and 40 bar and temperatures in the range between 180° C. and 220° C., said first reactor being one of a slurry reactor and a fixed-bed reactor charged with a first catalyst, which is an alkali-promoted cobalt-based catalyst;
a device for removing at least one of water and heavy hydrocarbons from the product stream of the first reactor;
a second reactor configured to subject the product from one of the first reactor and the device for removing at least one of water and heavy hydrocarbons together with syngas of a hydrogen/carbon monoxide ratio higher than that used in the first reactor or hydrogen to Fischer-Tropsch reaction conditions at pressures in the range between 10 bar and 40 bar and temperatures in the range between 200° C. and 250° C., said second reactor being one of a slurry reactor and a fixed-bed reactor charged with a second catalyst, said second catalyst being a promoted cobalt-based catalyst having a higher activity than said first catalyst;
a second device for removing at least one of water and liquid hydrocarbons from the product stream of the second reactor;
and
a third reactor for subjecting the product from the second device for removing at least one of water and liquid hydrocarbons together with syngas to Fischer-Tropsch reaction conditions at pressures in the range between 10 bar and 40 bar and temperatures in the range between 200° C. and 250° C. in the presence of a third catalyst, said third catalyst being a promoted cobalt-based catalyst having a higher activity than at least said first catalyst.

3 more elements

Dependencies are inferred from the claim text.