Separating carbon dioxide and hydrogen from a multicomponent gaseous stream
AssigneeSaudi Arabian Oil Company
InventorPramod Dhanaji Patil
Life of this patent
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Abstract
A system and a method separating CO2 from a gas mixture using hydrates are provided. An exemplary method includes injecting a feed gas into a gas hydrate column through a feed gas line and producing hydrogen from a hydrogen outlet line. The method includes determining that water on trays in the gas hydrate column is saturated with CO2 gas hydrates, closing valves on the feed gas line and the hydrogen outlet line, opening a valve leading to a carbon dioxide outlet line, lowering pressure in the gas hydrate column, and producing carbon dioxide from the carbon dioxide outlet line.
Claims22
A gas hydrate column, comprising:
- a column shell to be pressurized in a first stage of operation and depressurized in a second stage of operation;
- bubble trays disposed vertically in the column shell, wherein the bubble trays are configured to hold a level of water on each of the bubble trays;
- a feed gas inlet to feed a gas mixture into the column shell, where in the gas mixture is compressed and chilled to form CO2 hydrates in the water on the bubble trays;
- a gas outlet to release non-hydrate forming gases during the first stage of operation;
- and
- a gas outlet to release hydrate-forming gases during the second stage of operation.
A method for separating CO2 from a gas mixture using hydrates, comprising:
- injecting a feed gas into a gas hydrate column through a feed gas line;
- producing hydrogen from a hydrogen outlet line;
- determining that water on trays in the gas hydrate column is saturated with CO2 gas hydrates;
- closing valves on the feed gas line and the hydrogen outlet line;
- opening a valve leading to a carbon dioxide outlet line;
- lowering pressure in the gas hydrate column;
- and
- producing carbon dioxide from the carbon dioxide outlet line.
Dependencies are inferred from the claim text.