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US 9,770,687 B2Granted
Control of gas composition of a gas separation system having membranes
AssigneeEvonik Fibres GmbH
InventorsMarkus Ungerank, Harald Roegl
Life of this patent
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Abstract
The present invention relates to a method of controlling a gas separation plant, to a plant thus controlled and also to its use for separation of gas mixtures, especially in the processing of biogas or natural gas, or syngas.
Claims20
An apparatus for separating gases, comprising as membrane separation stages at least a feed stream separation stage, a retentate separation stage and a permeate separation stage and also at least one compressor arranged on the feed side of said feed stream separation stage and/or at least one vacuum pump arranged downstream of said feed stream separation stage,
- wherein
- said feed stream separation stage separates a feed stream, consisting of two or more components, into a first permeate stream and a first retentate stream,
- said retentate separation stage divides said first retentate stream into a second permeate stream and a second retentate stream, wherein the second permeate stream is supplied to a permeate control means located downstream of said retentate separation stage and wherein said second permeate stream is supplied to said feed stream downstream of said permeate control means, and wherein said second retentate stream is removed as product or further processed,
- said permeate separation stage divides said first permeate stream into a third retentate stream and a third permeate stream, wherein said third retentate stream is supplied to a retentate control means located downstream of said permeate separation stage and wherein said third retentate stream is supplied to said feed stream downstream of said retentate control means, and wherein said third permeate stream is removed as product or further processed or discarded,
- said permeate control means can raise or lower the permeate pressure of said retentate separation stage and is controlled on the basis of measured values from one or more measuring means in said first retentate stream and/or one or more measuring means in said second retentate stream,
- and/or
- said retentate control means can raise or lower the retentate pressure of said permeate separation stage and is controlled on the basis of measured values from one or more measuring means in said first permeate stream and/or one or more measuring means in said third permeate stream.
4 more elements
Dependencies are inferred from the claim text.