Refinery gas upgrading via partial condensation and PSA
First Claim
1. A process for recovering high purity hydrogen and optionally one or more hydrocarbon-rich products from a feed gas containing less than 50 mole % hydrogen comprising the steps of:
- a) cooling a feed gas in one or more heat exchangers and producing a partially condensed feed gas;
b) separating the partially condensed feed gas to produce a hydrogen-enriched stream and a hydrocarbon-enriched stream;
c) generating refrigeration by Joule-Thomson expansion of the hydrocarbon-enriched stream and producing a colder hydrocarbon-rich stream;
d) further cooling the hydrogen-enriched stream to produce a partially condensed hydrogen-enriched stream;
e) separating the partially condensed hydrogen-enriched stream into a hydrogen-rich stream and a hydrocarbon-rich stream;
f) generating refrigeration by Joule-Thomson expansion of hydrogen-rich stream and hydrocarbon-rich stream;
g) recovering refrigeration from hydrogen-rich stream to cool the hydrogen-enriched stream in step (d) and the feed gas in step (a);
h) recovering a gas stream containing at least 60 mole % hydrogen from the hydrogen-rich stream;
i) feeding the gas stream containing at least 60 mole % hydrogen to a pressure swing adsorption (PSA) system and recovering high purity hydrogen;
j) recovering refrigeration from the cold hydrocarbon-rich stream to cool the hydrogen-enriched stream in step (d);
k) producing a recontacting stream from the partially condensed hydrogen-enriched stream;
l) feeding the cold hydrocarbon-enriched stream and the recontacting stream to a wash column and producing a methane-rich vapor stream and a hydrocarbon-rich liquid stream;
m) recovering refrigeration from the methane-rich vapor stream and compressing it to produce a methane-rich vapor product; and
n) recovering refrigeration from the hydrocarbon-rich liquid stream and compressing it to produce a raw liquefied petroleum gas (LPG) product.
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Abstract
A process and system for recovering valuable by-products (e.g., hydrogen) from refinery gas streams. For hydrogen-only recovery, the invention comprises a partial condensation step to upgrade the refinery fuel gas to a minimum of 60% hydrogen, which is further purified in a pressure swing adsorption process. When configured to recover hydrogen, methane-rich gas and raw LPG (methane depleted gas containing C2 hydrocarbons and heavier), the invention comprises two partial condensation steps where the feed is cooled in the first step to allow separation of ethane and heavier hydrocarbons, and the resulting vapor is cooled to a lower temperature in a second step for hydrogen recovery.
19 Citations
2 Claims
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1. A process for recovering high purity hydrogen and optionally one or more hydrocarbon-rich products from a feed gas containing less than 50 mole % hydrogen comprising the steps of:
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a) cooling a feed gas in one or more heat exchangers and producing a partially condensed feed gas; b) separating the partially condensed feed gas to produce a hydrogen-enriched stream and a hydrocarbon-enriched stream; c) generating refrigeration by Joule-Thomson expansion of the hydrocarbon-enriched stream and producing a colder hydrocarbon-rich stream; d) further cooling the hydrogen-enriched stream to produce a partially condensed hydrogen-enriched stream; e) separating the partially condensed hydrogen-enriched stream into a hydrogen-rich stream and a hydrocarbon-rich stream; f) generating refrigeration by Joule-Thomson expansion of hydrogen-rich stream and hydrocarbon-rich stream; g) recovering refrigeration from hydrogen-rich stream to cool the hydrogen-enriched stream in step (d) and the feed gas in step (a); h) recovering a gas stream containing at least 60 mole % hydrogen from the hydrogen-rich stream; i) feeding the gas stream containing at least 60 mole % hydrogen to a pressure swing adsorption (PSA) system and recovering high purity hydrogen; j) recovering refrigeration from the cold hydrocarbon-rich stream to cool the hydrogen-enriched stream in step (d); k) producing a recontacting stream from the partially condensed hydrogen-enriched stream; l) feeding the cold hydrocarbon-enriched stream and the recontacting stream to a wash column and producing a methane-rich vapor stream and a hydrocarbon-rich liquid stream; m) recovering refrigeration from the methane-rich vapor stream and compressing it to produce a methane-rich vapor product; and n) recovering refrigeration from the hydrocarbon-rich liquid stream and compressing it to produce a raw liquefied petroleum gas (LPG) product.
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2. A process for recovering high purity hydrogen and optionally one or more hydrocarbon-rich products from a feed gas containing less than 50 mole % hydrogen comprising the steps of:
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a) cooling a feed gas in one or more heat exchangers and producing a partially condensed feed gas; b) separating the partially condensed feed gas to produce a hydrogen-enriched stream and a hydrocarbon-enriched stream; c) generating refrigeration by Joule-Thomson expansion of the hydrocarbon-enriched stream and producing a colder hydrocarbon-rich stream; d) further cooling the hydrogen-enriched stream to produce a partially condensed hydrogen-enriched stream; e) separating the partially condensed hydrogen-enriched stream into a hydrogen-rich stream and a hydrocarbon-rich stream; f) generating refrigeration by Joule-Thomson expansion of hydrogen-rich stream and hydrocarbon-rich stream; g) recovering refrigeration from hydrogen-rich stream to cool the hydrogen-enriched stream in step (d) and the feed gas in step (a); h) recovering a gas stream containing at least 60 mole % hydrogen from the hydrogen-rich stream; i) feeding the gas stream containing at least 60 mole % hydrogen to a pressure swing adsorption (PSA) system and recovering high purity hydrogen; j) recovering refrigeration from the cold hydrocarbon-rich stream to cool the hydrogen-enriched stream in step (d); k) producing a recontacting stream from the partially condensed hydrogen-enriched stream; l) feeding the cold hydrocarbon-enriched stream and the recontacting stream to a wash column and producing a methane-rich vapor stream and a hydrocarbon-rich liquid stream; m) recovering refrigeration from the methane-rich vapor stream and compressing it to produce a methane-rich vapor product; n) recovering refrigeration from the hydrocarbon-rich liquid stream and compressing it to produce a raw LPG product; and o) processing the methane-rich vapor product in a steam methane reforming process to produce a hydrogen containing stream that is fed to the PSA system.
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Specification