Autothermal steam reforming process
First Claim
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1. A method for producing synthesis gases for use in the production of ammonia and methanol from a fresh hydrocarbon component stream which consists of:
- a) forming a first mixed feed stream comprising steam, a major portion of the fresh hydrocarbon component stream, and an oxidant selected from the group consisting of air, oxygen-enriched air and oxygen and introducing the first mixed feed stream to an exothermic catalytic steam reforming zone wherein there is produced a first reformed gas containing less than 2.0 volume percent, dry basis, residual hydrocarbon and withdrawing the first reformed gas therefrom;
b) forming a second mixed stream comprising a remaining minor portion of the fresh hydrocarbon component stream and steam and introducing the second mixed feed stream to an endothermic catalytic steam reforming zone wherein there is produced a second reformed gas containing less than 10.0 volume percent, dry basis, residual hydrocarbon and withdrawing the second reformed gas therefrom;
c) combining the first and second reformed gases and cooling the combined first and second reformed gases by passing the combined gases in indirect heat exchange with the second mixed feed stream within the endothermic catalytic steam reforming zone whereby all of the heat required for the endothermic catalytic steam reforming of the second feed stream therein is provided; and
d) withdrawing and recovering the resulting cooled combined gases as synthesis gas product.
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Abstract
Synthesis gases are produced by reaction of steam, oxidant, and a major portion of fresh hydrocarbon feed in an exothermic catalytic reforming zone to a first reformed gas having very low methane content. The balance of the fresh feed is reacted with steam in an endothermic catalytic reforming zone to a second reformed gas having a low methane content. The first and second reformed gases are combined and passed in indirect heat exchange with reactants in the endothermic reforming zone to provide all of the heat required therein and are then recovered as product synthesis gases.
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7 Claims
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1. A method for producing synthesis gases for use in the production of ammonia and methanol from a fresh hydrocarbon component stream which consists of:
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a) forming a first mixed feed stream comprising steam, a major portion of the fresh hydrocarbon component stream, and an oxidant selected from the group consisting of air, oxygen-enriched air and oxygen and introducing the first mixed feed stream to an exothermic catalytic steam reforming zone wherein there is produced a first reformed gas containing less than 2.0 volume percent, dry basis, residual hydrocarbon and withdrawing the first reformed gas therefrom; b) forming a second mixed stream comprising a remaining minor portion of the fresh hydrocarbon component stream and steam and introducing the second mixed feed stream to an endothermic catalytic steam reforming zone wherein there is produced a second reformed gas containing less than 10.0 volume percent, dry basis, residual hydrocarbon and withdrawing the second reformed gas therefrom; c) combining the first and second reformed gases and cooling the combined first and second reformed gases by passing the combined gases in indirect heat exchange with the second mixed feed stream within the endothermic catalytic steam reforming zone whereby all of the heat required for the endothermic catalytic steam reforming of the second feed stream therein is provided; and d) withdrawing and recovering the resulting cooled combined gases as synthesis gas product. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification