Process for producing a hydrogen-rich gas stream from the effluent of a catalytic hydrocarbon conversion reaction zone
First Claim
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1. A process to provide a purified hydrogen-rich gas stream and to maximize recovery of C3+ hydrocarbons from a catalytic hydrocarbon conversion reaction effluent containing hydrogen and hydrocarbons by treating said effluent from a catalytic hydrocarbon conversion reaction zone comprising the steps of:
- (a) passing said catalytic hydrocarbon conversion reaction effluent containing hydrogen and hydrocarbons to a first vapor-liquid equilibrium zone, recovering therefrom a hydrogen-containing vapor phase and recycling a first portion thereof to said hydrocarbon conversion reaction zone;
(b) drying at least a second portion of the hydrogen-containing vapor phase by removing water therefrom and thereafter cooling the dried portion by indirect heat exchange with a hereinafter defined hydrogen-rich gas stream;
(c) passing the dried, cooled portion of the hydrogen-containing vapor phase to a second vapor-liquid equilibrium separation zone to produce a liquid stream comprising C3+ light hydrocarbons, which are recovered from said process, and a purified hydrogen-rich gas stream;
(d) expanding at least a portion of said purified hydrogen-rich gas stream and thereafter subjecting it to indirect heat exchange with the dried portion of the hydrogen-containing vapor phase pursuant to step (b) above; and
,(e) recovering said heat exchanged purified hydrogen-rich gas stream.
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Abstract
A process for the production of a hydrogen-rich gas stream from the effluent of a catalytic hydrocarbon conversion reaction zone is disclosed. A hydrogen-containing vapor phase is recovered from the effluent and subjected to cooling in order to produce a hydrogen-rich gas stream. The resulting hydrogen-rich gas stream is expanded to provide the medium used in cooling the hydrogen-containing vapor phase.
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Citations
10 Claims
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1. A process to provide a purified hydrogen-rich gas stream and to maximize recovery of C3+ hydrocarbons from a catalytic hydrocarbon conversion reaction effluent containing hydrogen and hydrocarbons by treating said effluent from a catalytic hydrocarbon conversion reaction zone comprising the steps of:
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(a) passing said catalytic hydrocarbon conversion reaction effluent containing hydrogen and hydrocarbons to a first vapor-liquid equilibrium zone, recovering therefrom a hydrogen-containing vapor phase and recycling a first portion thereof to said hydrocarbon conversion reaction zone; (b) drying at least a second portion of the hydrogen-containing vapor phase by removing water therefrom and thereafter cooling the dried portion by indirect heat exchange with a hereinafter defined hydrogen-rich gas stream; (c) passing the dried, cooled portion of the hydrogen-containing vapor phase to a second vapor-liquid equilibrium separation zone to produce a liquid stream comprising C3+ light hydrocarbons, which are recovered from said process, and a purified hydrogen-rich gas stream; (d) expanding at least a portion of said purified hydrogen-rich gas stream and thereafter subjecting it to indirect heat exchange with the dried portion of the hydrogen-containing vapor phase pursuant to step (b) above; and
,(e) recovering said heat exchanged purified hydrogen-rich gas stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process to produce a purified hydrogen rich gas stream and to maximize recovery of C3+ hydrocarbons from a catalytic hydrocarbon reforming effluent containing hydrogen and hydrocarbons by treating said effluent from a catalyst reforming reaction zone comprising the steps of:
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(a) passing said effluent to a first vapor-liquid equilibrium zone and recovering therefrom a hydrogen-containing vapor phase; (b) subjecting a first portion of the hydrogen-containing vapor phase to compression and recycling at least part of the compressed first portion to the catalytic reforming reaction zone; (c) drying a second portion of the hydrogen-containing vapor phase by removing water therefrom and thereafter cooling the dried portion by indirect heat exchange with a hereinafter defined purified hydrogen-rich gas stream; (d) passing the dried, cooled portion of the hydrogen-containing vapor phase to a second vapor-liquid equilibrium separation zone to produce a liquid stream comprising C3+ light hydrocarbons, which are recovered from said process, and a purified hydrogen-rich gas stream; (e) subjecting at least a portion of said purified hydrogen-rich gas stream to an expansion and thereafter subjecting it to indirect heat exchange with the dried second portion of the hydrogen-containing vapor phase pursuant to step (c) above, and effecting the compression in step (b) above at least in part with energy resulting from said expansion of a portion of said purified hydrogen-rich gas stream; and
,(f) recovering said heat exchanged purified hydrogen-rich gas stream.
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Specification