Production of synthesis gas via fluidized bed/fixed bed process combination
First Claim
1. In a process for the production of hydrogen and carbon monoxide, the steps comprisingcontacting, in a first reaction zone, low molecular weight hydrocarbons comprising methane, oxygen, and steam, at high temperature in a net reducing atmosphere, with a fluidized bed of catalyst, or catalyst and a solids diluent, to convert from about 85 percent to about 92 percent of the hydrocarbons to hydrogen and carbon monoxide and form a reaction mixture of hydrogen, carbon monoxide and unreacted hydrocarbons, oxygen and steam,withdrawing said reaction mixture as an effluent from said first reaction zone, andcontacting said effluent, in a second reaction zone, with a fixed bed of catalytic metal solids with a void fraction of at least about 0.9 to convert, sufficient of the unreacted hydrocarbons, oxygen, and steam and increase the hydrocarbon conversion to a level ranging from about 0.5 percent to about 5 percent above that obtained in said first reaction zone.
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Abstract
A mixture of hydrocarbons, oxygen and steam is reacted over a fluidized bed, in a first reaction stage, at high temperature to produce, at hydrocarbon conversion levels ranging from about 85 percent to about 92 percent, a reaction product of hydrogen and carbon monoxide in admixture with unreacted hydrocarbons, carbon dioxide and steam. The level of hydrocarbon conversion is further increased by about 0.5 to 5 percent by contacting and endothermically reacting the reaction product mixture over a fixed bed of a high void fraction catalyst in a second reaction stage.
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Citations
20 Claims
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1. In a process for the production of hydrogen and carbon monoxide, the steps comprising
contacting, in a first reaction zone, low molecular weight hydrocarbons comprising methane, oxygen, and steam, at high temperature in a net reducing atmosphere, with a fluidized bed of catalyst, or catalyst and a solids diluent, to convert from about 85 percent to about 92 percent of the hydrocarbons to hydrogen and carbon monoxide and form a reaction mixture of hydrogen, carbon monoxide and unreacted hydrocarbons, oxygen and steam, withdrawing said reaction mixture as an effluent from said first reaction zone, and contacting said effluent, in a second reaction zone, with a fixed bed of catalytic metal solids with a void fraction of at least about 0.9 to convert, sufficient of the unreacted hydrocarbons, oxygen, and steam and increase the hydrocarbon conversion to a level ranging from about 0.5 percent to about 5 percent above that obtained in said first reaction zone.
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14. In a process for the production of hydrogen and carbon monoxide, the steps comprising
contacting, in a first reaction zone, low molecular weight hydrocarbons, comprising methane oxygen, and steam, at temperature ranging from about 1500° - F. to about 1900°
F. in a net reducing atmosphere, with a fluidized bed of catalyst, or catalyst and a solids diluent, to convert from about 85 percent to about 92 percent of the hydrocarbons to hydrogen and carbon monoxide and form a reaction mixture of hydrogen, carbon monoxide and unreacted hydrocarbons, oxygen and steam,withdrawing said reaction mixture as an effluent from said first reaction zone, and contacting said effluent, in a second reaction zone, with a fixed bed of catalytic metal solids having a void fraction at least about 0.9, and providing an effluent residence time in said second reaction zone less than about 1 second to convert the unreacted hydrocarbons, oxygen, and steam and increase the hydrocarbon conversion to a level ranging from about 0.5 percent to about 5 percent above that of said first reaction zone. - View Dependent Claims (15, 16, 17, 18, 19, 20)
- F. to about 1900°
Specification