Oxygen Removal From Contaminated Gases
First Claim
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1. A process for the improved separation of oxygen from a natural gas feed stream which comprises:
- a. passing said natural gas feed stream to a first separation unit so as to separate oxygen from said feed stream and produce a first product stream enriched with methane and a waste stream having a higher molar concentration of oxygen than said feed stream; and
b. passing said first product stream to a second separation unit containing an oxygen-selective adsorbent and operated with a pressure swing so as to preferentially adsorb said oxygen to produce a low pressure gas stream enriched with oxygen and produce a higher pressure second product stream enriched with methane.
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Abstract
The invention relates to a method for achieving low oxygen levels in a natural gas stream without the use of a catalytic system. In one embodiment, the method comprises: membrane treatment for the removal of the bulk of CO2 and oxygen in the natural gas feed and the addition of a PSA system using a carbon molecular sieve adsorbent for the adsorption of residual oxygen.
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Citations
25 Claims
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1. A process for the improved separation of oxygen from a natural gas feed stream which comprises:
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a. passing said natural gas feed stream to a first separation unit so as to separate oxygen from said feed stream and produce a first product stream enriched with methane and a waste stream having a higher molar concentration of oxygen than said feed stream; and b. passing said first product stream to a second separation unit containing an oxygen-selective adsorbent and operated with a pressure swing so as to preferentially adsorb said oxygen to produce a low pressure gas stream enriched with oxygen and produce a higher pressure second product stream enriched with methane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A process for the improved separation of oxygen from a natural gas feed stream, which comprises:
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a. passing said natural gas feed stream to a membrane separation unit so as to separate oxygen from said feed stream and produce a first product stream enriched with methane and a waste stream having a higher molar concentration of oxygen than said feed stream; b. passing said first product stream to a pressure swing adsorption unit containing a carbon molecular sieve so as to preferentially adsorb oxygen to produce a low pressure gas stream enriched with oxygen and to produce a second product stream enriched with methane; and c. recycling said low pressure gas stream back to said feed stream for said membrane separation unit. - View Dependent Claims (24, 25)
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Specification