Abstract:
A process for separating CO 2 from a CO 2 containing gas stream with varying CO 2 concentration using a membrane-based separation system. The process comprises: (i) feeding the CO 2 containing gas stream into a membrane-based separation system comprising one or more membrane stage(s) in-line, each membrane stage producing a CO 2 -depleted retentate stream and a rich CO 2 permeate stream, and (ii) recycling a part of the CO 2 -rich permeate stream from at least one membrane stage as a recycled stream, into a preceding feed stream of one or more membrane stages in the membrane-based separation system to adjust the CO 2 concentration of the feed stream. The process could stabilize the CO 2 concentration in the feed steam by recirculation of a fraction of the high purity CO 2 permeate to the feed of the membrane system.
Abstract:
Gas separation modules and methods for use including an integrated adsorbent and membrane. In certain refining applications, it is paramount to obtain high purity product gases. Adsorbent beds are effective at removing certain contaminants, such as CO 2 , from gas streams containing product and contaminant constituents to form a product-rich stream. The integrated membrane permits a further separation of products from any unadsorbed contaminant to produce a high purity product, such as hydrogen, stream. The gas separation modules described herein include stacked, radial, and spiral arrangements. Each modules includes a configuration of feed and cross-flow channels for the collection of contaminant gases and/or high purity product gases.
Abstract:
The present invention relates to a membrane module for the separation of hydrogen from CO 2 in a gas mixture, a method and system for treatment of natural gas and for improved extraction of an oil reservoir comprising the following steps: extracting natural gas from an oil reservoir (5), reforming (4) of the natural gas followed by water gas shift to obtain a gas mixture comprising hydrogen and CO 2 , separation of hydrogen and CO 2 in the gas mixture using at least one membrane module (20) comprising a porous tube (22) coated with a palladium-silver membrane, and injection (3) of CO 2 rich retentate produced in the separation process (10) into an oil reservoir with need for increased pressure. The hydrogen produced in the separation process can be transported to the consumer in a pure form for later use or it can be mixed with natural gas and transported together with the natural gas in existing pipelines.
Abstract:
A membrane contactor system for separating CO 2 from a mixed gaseous feed stream comprising CO 2 , said contactor system comprising: (i) a composite membrane, said membrane having a permeate side and a retentate side; (ii) said retentate side being exposed to a mixed gaseous feed stream comprising carbon dioxide; (iii) said permeate side being exposed to a carbon dioxide capture organic solvent; (iv) said composite membrane comprising a porous layer and a non-porous selective polymer layer, said non-porous selective polymer layer selectively allowing transport of CO 2 across the composite membrane from said mixed gaseous feed stream so that it dissolves in said capture solvent whilst limiting the transport of said capture solvent across the composite membrane.
Abstract:
Disclosed is a mixed matrix oligomeric material and methods for making and using the same. The material can include a cross-linked matrix and metal organic framework (MOFs) dispersed in the matrix, wherein the matrix includes cross-linked oligomers having a molecular weight of less than 3000 g/mole, and wherein the oligomers cross-link with one another through cross-linkable groups present on the oligomers.
Abstract:
Disclosed herein are 2-stage membrane separation methods for capturing CO 2 from a feed gas. The methods can employ two selectively permeable membranes, which may be the same or different. The selectively permeable membrane can have a carbon dioxide permeance of from 500 to 3000 GPU at 57°C and 1 atm feed pressure and a carbon dioxide:nitrogen selectivity of from 10 to 1000 at 57°C and 1 atm feed pressure. High pressure ratios across the membranes can be achieved by compressing the feed gas to a high pressure, by using vacuum pumps to create a lowered pressure on the permeate side of the membrane, by using a sweep stream, or a combination thereof. When a sweep stream is used, the sweep stream may include a portion of the retentate gas stream obtained from the retentate side of one or more of the membranes used.
Abstract:
Disclosed herein is a method of making a crosslinked membrane such as a crosslinked hollow fiber membrane. The method comprises (a) preparing a polyimide polymer comprising carboxylic acid functional groups from a reaction solution comprising monomers and at least one solvent; (b) treating the polyimide polymer with a diol at esterification conditions to form a monoesterified polyimide polymer; (c) forming a monoesterified polyimide membrane or dense film from the monoesterified polyimide polymer; and (d) subjecting the monoesterified polyimide membrane or dense film to transesterification conditions under a CO 2 atmosphere to form a crosslinked polyimide membrane or dense film.
Abstract:
One or more processes to cool a wet natural gas feed stream before the feed stream is passed to a guard bed zone for a membrane separation unit. The processes utilizing an existing processes stream that has a temperature below the hydrate formation temperature of the feed stream. The existing stream may be a residue stream from the membrane separation unit which is heat exchanged with a cleaned stream from the guard bed zone. The cooled clean stream may then be used to cool the wet feed stream.
Abstract:
The present invention provides a high selectivity epoxysilicone-cross-linked polyimide membrane comprising a polyimide polymer with hydroxyl functional groups cross-linked with epoxy functional groups on epoxysilicone polymer. The present invention also provides a process for separating at least one gas from a mixture of gases using the high selectivity epoxysilicone-cross-linked polyimide membrane. The process comprises providing the high selectivity epoxysilicone-cross-linked polyimide membrane which is permeable to the at least one gas; contacting the mixture on one side of the membrane to cause the at least one gas to permeate the membrane; and removing from the opposite side of the membrane a permeate gas composition comprising a portion of the at least one gas which permeated the high selectivity epoxysilicone-cross-linked polyimide membrane.