HYDRATE FORMATION FOR GAS SEPARATION OR TRANSPORT
First Claim
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1. A gas separation process comprising:
- entraining a solid particle medium in a fluidizable mixture to form a fluidized mixture, wherein said fluidizable mixture includes an aqueous liquid feed and a gas mixture feed including a first gas having a first hydrate P-T stability envelope and a second gas having a second hydrate P-T stability envelope different from said first hydrate P-T stability envelope;
conveying said fluidized mixture past a heat transfer surface while contacting said fluidized mixture with said heat transfer surface, wherein said heat transfer surface is cooler than said fluidized mixture;
cooling said fluidized mixture upon contact with said heat transfer surface to an operating temperature at an operating pressure, wherein said operating pressure and operating temperature are outside said first hydrate P-T stability envelope and inside said second hydrate P-T stability envelope;
converting at least a portion of said second gas and at least a portion of said aqueous liquid feed to a plurality of gas hydrate particles;
forming a gas hydrate slurry comprising said plurality of gas hydrate particles and a portion of said aqueous liquid feed; and
separating said gas hydrate slurry from said first gas.
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Abstract
A gas separation or gas transportation process forms a gas hydrate from an aqueous feed and a gas feed having a hydrate P-T stability envelope. While in the presence of the aqueous feed, the gas feed is initially pressurized to an operating pressure and cooled to an operating temperature which are inside the hydrate P-T stability envelope to form a gas hydrate from at least a portion of the gas feed and at least a portion of the aqueous feed. The resulting gas hydrate is readily separable from any remaining gas and stable for transport.
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Citations
25 Claims
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1. A gas separation process comprising:
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entraining a solid particle medium in a fluidizable mixture to form a fluidized mixture, wherein said fluidizable mixture includes an aqueous liquid feed and a gas mixture feed including a first gas having a first hydrate P-T stability envelope and a second gas having a second hydrate P-T stability envelope different from said first hydrate P-T stability envelope; conveying said fluidized mixture past a heat transfer surface while contacting said fluidized mixture with said heat transfer surface, wherein said heat transfer surface is cooler than said fluidized mixture; cooling said fluidized mixture upon contact with said heat transfer surface to an operating temperature at an operating pressure, wherein said operating pressure and operating temperature are outside said first hydrate P-T stability envelope and inside said second hydrate P-T stability envelope; converting at least a portion of said second gas and at least a portion of said aqueous liquid feed to a plurality of gas hydrate particles; forming a gas hydrate slurry comprising said plurality of gas hydrate particles and a portion of said aqueous liquid feed; and separating said gas hydrate slurry from said first gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 20, 21, 22)
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10. A gas separation process comprising:
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fluidizing a solid particle medium, water, a first gas having a first hydrate P-T stability envelope and a second gas having a second hydrate P-T stability envelope different from said first hydrate P-T stability envelope to form a fluidized bed comprising said solid particle medium, said water, said first gas and said second gas; cooling said first gas and said second gas to an operating temperature at an operating pressure, wherein said operating pressure and said operating temperature are outside said first hydrate P-T stability envelope and inside said second hydrate P-T stability envelope; converting at least a portion of said second gas and at least a portion of said water to gas hydrate particles; and separating said gas hydrate particles from said first gas. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A gas separation process comprising:
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entraining a solid particle medium in a fluidizable mixture to form a fluidized mixture, wherein said fluidizable mixture includes water, a first gas having a first hydrate P-T stability envelope and a second gas having a second hydrate P-T stability envelope different from said first hydrate P-T stability envelope; conveying said fluidized mixture past a heat transfer surface while contacting said fluidized mixture with said heat transfer surface, wherein said heat transfer surface is cooler than said fluidized mixture; cooling said fluidized mixture upon contact with said heat transfer surface to an operating temperature at an operating pressure, wherein said operating pressure and operating temperature are outside said first hydrate P-T stability envelope and inside said second hydrate P-T stability envelope; converting at least a portion of said second gas and at least a portion of said water to gas hydrate particles; and separating said gas hydrate particles from said first gas. - View Dependent Claims (18, 19, 23, 24, 25)
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Specification