초록 ▼

A Fischer-Tropsch process is provided for synthesizing hydrocarbons, involving multiple Fischer-Tropsch reactor stages (110) arranged in series, and characterized by very low carbon monoxide conversion per Fischer-Tropsch reactor stage (110) and intermediate removal of water between reactor stages (

A Fischer-Tropsch process is provided for synthesizing hydrocarbons, involving multiple Fischer-Tropsch reactor stages (110) arranged in series, and characterized by very low carbon monoxide conversion per Fischer-Tropsch reactor stage (110) and intermediate removal of water between reactor stages (110). In one embodiment, the system utilizes an iron-based catalyst and balances the molar H.sub.2 /CO feed ratio in the synthesis gas (108) with the overall H.sub.2 /CO consumption ratio across all of the Fischer-Tropsch reactor stages (110). In a preferred embodiment, carbon dioxide is recycled from the last in series of the Fischer-Tropsch reactor stages (110) to the synthesis gas generator (106). The system may advantageously utilize a gaseous hydrocarbon feed (102), such as obtained from natural gas, as feed for producing the synthesis gas (108).

대표청구항 ▼

[ What is claimed is:] [1.] A staged Fischer-Tropsch method for synthesizing hydrocarbons, comprising:generating a synthesis gas from a gaseous hydrocarbon feed, with hydrocarbons in the gaseous hydrocarbon feed including greater than about 95% by moles of C.sub.4 -hydrocarbons, the synthesis gas in

[ What is claimed is:] [1.] A staged Fischer-Tropsch method for synthesizing hydrocarbons, comprising:generating a synthesis gas from a gaseous hydrocarbon feed, with hydrocarbons in the gaseous hydrocarbon feed including greater than about 95% by moles of C.sub.4 -hydrocarbons, the synthesis gas including at least carbon monoxide, hydrogen and carbon dioxide, with the hydrogen and carbon monoxide being present in the synthesis gas at a molar feed ratio of hydrogen to carbon monoxide in a range of from about 1.3 to about 1.9;feeding the synthesis gas to a plurality of Fischer-Tropsch reactor stages arranged in series, each of said Fischer-Tropsch reactor stages having a reactor volume containing a Fischer-Tropsch catalyst; andreacting in a staged Fischer-Tropsch reaction at least a portion of the synthesis gas in each of the Fischer-Tropsch reactor stages, with intermediate removal of water between the Fischer-Tropsch reactor stages, to form Fischer-Tropsch reaction products including synthesized hydrocarbon products and carbon dioxide, the Fischer-Tropsch catalyst being an iron-based catalyst contained in the reactor volume of each of the Fischer-Tropsch reactor stages in the form of particles slurried with hot liquid hydrocarbons of the Fischer-Tropsch reaction products;wherein carbon dioxide is added as feed to the step of generating the synthesis gas and at least the first one in series of the Fischer-Tropsch reactor stages is operated at a carbon monoxide conversion of no larger than 70%, so that the overall consumption of the hydrogen and carbon monoxide across all of the series of Fischer-Tropsch reactor stages is at an overall molar consumption ratio of hydrogen to carbon monoxide having a value in a range of from about 0.2 smaller than the molar feed ratio to about 0.2 larger than the molar feed ratio.