Process to control nitrogen-containing compounds in synthesis gas
First Claim
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1. A process to remove N-contaminants from a syngas stream comprising the steps of:
- (a) introducing a syngas stream and a water stream into a first absorber;
(b) recovering a first-washed syngas stream overhead from the first absorber;
(c) introducing the first-washed syngas stream and a Fischer-Tropsch produced water stream into a second absorber; and
(d) recovering a second-washed syngas stream overhead from the second absorber.
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Abstract
A process to control the amount of N-contaminant is synthesis gas which is fed into a Fischer-Tropsch reactor and which utilizes Fischer-Tropsch produced water is provided. A process which utilizes a countercurrent flow of Fischer-Tropsch produced water produced in a downstream Fischer-Tropsch reactor to wash syngas being fed to an upstream Fischer-Tropsch reactor is provided.
50 Citations
19 Claims
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1. A process to remove N-contaminants from a syngas stream comprising the steps of:
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(a) introducing a syngas stream and a water stream into a first absorber;
(b) recovering a first-washed syngas stream overhead from the first absorber;
(c) introducing the first-washed syngas stream and a Fischer-Tropsch produced water stream into a second absorber; and
(d) recovering a second-washed syngas stream overhead from the second absorber. - View Dependent Claims (2, 3, 4, 15, 17, 18, 19)
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5. A Fischer-Tropsch process comprising the steps of:
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(a) introducing a feed syngas stream into a first-stage Fischer-Tropsch reactor and recovering a first overhead stream comprised of Fischer-Tropsch produced water, hydrocarbon product and unreacted syngas from the first stage Fischer-Tropsch reactor;
(b) separating the unreacted syngas component from the first overhead stream and introducing the unreacted syngas component into a second stage Fischer-Tropsch reactor;
(c) recovering a second overhead stream comprised of Fischer-Tropsch produced water and hydrocarbon product from the second stage Fischer-Tropsch reactor;
(d) separating the Fischer-Tropsch produced water from the second overhead stream; and
(e) mixing the Fischer-Tropsch produced water separated in step (d) with the first overhead stream. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. In a Fischer-Tropsch process wherein a synthesis gas is catalytically converted into a Fischer-Tropsch reaction product mixture and wherein two or more Fischer-Tropsch reactors are used in the process, the process improvement comprising:
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(a) separating Fischer-Tropsch produced water from the Fischer-Tropsch reaction product mixture of a first Fischer-Tropsch reactor; and
(b) mixing the separated Fischer-Tropsch water from step (a) with the feed to a second Fischer-Tropsch reactor wherein the second Fischer-Tropsch reactor is the same as the first Fischer-Tropsch reactor or is located upstream of the first Fischer-Tropsch reactor. - View Dependent Claims (13, 14)
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16. The process of claim 16 further comprising the step of mixing the first and second nitrogen-enriched streams together.
Specification