摘要:
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.
摘要:
The invention relates to a system for separating and storing molecules, atoms and/or ions from air, wherein at least one air collecting means comprises at least one collecting tank configured to receive molecules, atoms and/or ions separated from air through an inlet and at least one membrane adapted to fit in the inlet of the collecting tank and configured to let a specified pre-determined size of molecules, atoms and/or ions to pass through the at least one membrane. The system further comprises at least one storing tank for storing the separated molecules, atoms and/or ions, and at least one outlet. The system according to the invention can be used to utilize the energy present in such molecules or separate unwanted gases present in the air.
摘要:
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.
摘要:
The present invention relates a process and apparatus that recovers a helium rich stream from a mixed gas having low concentrations of helium therein. More specifically, the invention relates to an integrated process and apparatus for treating a mixed feed gas from an operating process that produces a liquid product from natural gas containing helium, such as processes that produce ammonia, methanol, or liquid hydrocarbons.
摘要:
A method for filtration of harmful gas effluents from an industrial installation comprising the following steps: - providing a gas effluent from an industrial installation, said gas effluent consisting of a mixture of gases, - filtering the harmful, elements from said gas effluent by membrane separation through a plurality of membranes, said membrane separation being achieved by sifting, sorption and/or diffusion, each membrane being adapted for filtering a specific harmful element, - sorting said filtered harmful elements and storing them in separate storage reservoirs, and - discharging said processed gas effluent to the atmosphere.
摘要:
A method for filtration of harmful gas effluents from a nuclear power plant comprising the following steps: - providing a gas effluent from a nuclear power plant, said effluent consisting of a mixture of gases, - filtering the harmful, notably radioactive elements from said gas effluent by membrane separation through at least one membrane, said membrane separation being achieved by sifting, sorption and/or diffusion, - storing said filtered harmful elements in storage reservoirs, and - discharging said processed gas effluent to the atmosphere.
摘要:
A modular filter cartridge (30) suitable for being arranged in a casing of a filter device for separating an inlet conduit and an outlet conduit of a fluid to be filtered, comprising a plurality of filter membranes (33) having a substantially toroid shape arranged in series for filtration of a fluid, reciprocally sealingly connected by a connecting element, in which each filter membrane comprises two support elements (31, 32) which are plate-shaped and are positioned at ends of the membrane, which support elements (31, 32) are provided with a central opening (34, 35) from which a hollow cylindrical shank (37, 38) derives, connecting elements (40) being provided that are independent of the casing and provided with a passage channel (43) for the fluid, destined to set the openings (34, 35) of the support elements (31, 32) of two consecutive filter membranes (33) in fluid communication, and engaging means (41, 42) destined to engage the connecting element (40) respectively with the shanks (37, 38) of two consecutive filter membranes (33).
摘要:
A process for recovering carbon dioxide from a pressurized hydrocarbon containing feed stream includes the following steps. A high pressure hydrocarbon containing feed stream that comprises at least methane and carbon dioxide is introduced into a first membrane separation unit at a temperature that is above the liquefaction temperature of carbon dioxide, the first membrane separation unit containing one or more membranes that are selective for carbon dioxide over the other components in the hydrocarbon containing feed stream, each membrane having a permeate side and a residue side and allowing for the passing of carbon dioxide to the permeate side to form a first membrane stream on the permeate side of the membrane and the substantial retention of the remaining components in the hydrocarbon containing feed stream to form a second membrane stream on the residue side of the membrane. The second membrane stream is withdrawn for further use. The first membrane stream is compressed. The compressed first membrane stream is cooled using a multi-stream heat exchanger in order to form a compressed, cooled two phase first membrane stream. The compressed, cooled, two phase first membrane stream is separated and purified in a carbon dioxide separation unit to produce a carbon dioxide rich liquid stream and a carbon dioxide lean vapor stream. The carbon dioxide rich liquid stream is recycled to the heat exchanger where the carbon dioxide rich stream is used to provide cooling of the first membrane stream thereby producing a warmer carbon dioxide rich liquid stream. The warmer carbon dioxide rich stream is recovered from the heat exchanger as a high purity carbon dioxide product.