Disclosed are methods of preparing a porous ceramic support for an ultra-thin enzyme-assisted membrane, and a new membrane that can be used for gas filtration purposes to remove/separate carbon dioxide or other gases from a gas mixture such as those from power production or enhanced oil recovery or fuel production or air, and recycle/collect/utilize carbon dioxide. In some embodiments, a method may include blocking the pores of a porous substrate with a removable medium, and polishing the surface, coating a silica sol-gel solution onto the support, and removing the blocking medium and sol-gel surfactant to leave a well-confined porous structure.

A system and method for producing hydrogen, including providing hydrocarbon and steam into a vessel to a region external to a tubular membrane in the vessel. The method includes steam reforming the hydrocarbon in the vessel via reforming catalyst to generate hydrogen and carbon dioxide. The method includes diffusing the hydrogen through the tubular membrane into a bore of the tubular membrane, wherein the tubular membrane is hydrogen selective.

A carbon dioxide separation method including the steps of: feeding a mixed gas that contains at least carbon dioxide and water vapor to a carbon dioxide separation membrane that contains a hydrophilic resin and a carbon dioxide carrier; separating, from the mixed gas, a permeation gas that contains the carbon dioxide by use of the carbon dioxide separation membrane; adjusting temperature of gas which contacts the carbon dioxide separation membrane so that a temperature difference between the mixed gas and the permeation gas is not lower than 0? C. and not higher than 20? C.; and adjusting pressure of the permeation gas, the pressure of the permeation gas and water vapor partial pressure in the mixed gas satisfying the following formula (1): 2.5 kPaA<(pressure of permeation gas)<(water vapor partial pressure in mixed gas) . . . (1).

A separation membrane structure comprising a porous support, a first glass seal, and a separation membrane. The porous support includes through-holes which connect a first end surface and a second end surface. The first glass seal is configured to cover the first end surface. The separation membrane is formed on an inner surface of the through-holes. The first glass seal has a first seal body part and a first extension part. The first seal body part is disposed on the first end surface. The first extension part is connected to the first seal body part and disposed on the inner surface of the through-holes. The separation membrane has a first connection part connected to the first extension part of the first glass seal. A first thickness of the first connection part is less than or equal to 10 microns, and less than or equal to 3.2 times a center thickness at a longitudinal center of the separation membrane.

A natural-gas purification apparatus includes: a compressor that adjusts the pressure of natural gas, and a separation device that separates natural-gas liquid and carbon dioxide from the natural gas after the pressure adjustment by the compressor through a natural-gas-liquid separation membrane and a carbon-dioxide separation membrane.

A gas separation membrane for selective separation of hydrogen and helium from gas mixtures containing carbon dioxide includes a porous support layer, an aromatic polyamide layer on the porous support layer, and a coating including a glassy polymer formed on the aromatic polyamide layer. A glass transition temperature of the glassy polymer is greater than 50? C. The gas separation membrane may be formed by contacting a solution including the glassy polymer with an aromatic polyamide layer of a composite membrane and drying the solution to form a coating of the glassy polymer on the aromatic polyamide layer. Separating hydrogen or helium from a gas stream including carbon dioxide includes contacting a gas feed stream including carbon dioxide with the gas separation membrane to yield a permeate stream having a concentration of helium or hydrogen that exceeds the concentration of helium or hydrogen, respectively, in the gas feed stream.

Oxygen concentrator apparatus and method of use are described herein. The oxygen concentration may include at least one canister; gas separation adsorbent disposed in at least one canister, and a compression system. The compression system may include at least one compressor coupled to the at least one canister. The compressor may include a first rotor comprising at least two projections and a second rotor comprising at least two recesses. During rotation of the first and second rotors, gas moves through the compressor to at least one of the canisters. In the canisters, gas separation adsorbent may separate at least some nitrogen from air produce oxygen enriched gas.

A non-cryogenic system for producing high-purity nitrogen is connected to a coiled-tubing unit. The nitrogen is produced by passing compressed ambient air through two polymeric membrane modules connected in series. The output of the second module is a stream of high-purity nitrogen, which is conveyed into a coiled tube. The nitrogen can be used for inerting the interior of the tube, or the coiled tube can be inserted into an oil well, for delivering nitrogen into the well. The use of nitrogen in a coiled tube helps to prevent corrosion in the tube.

A carbon dioxide collection and utilization system including: a regeneration unit that produces, from a solid material in or on which carbon dioxide is absorbed or adsorbed, a gas containing the carbon dioxide, and regenerates the solid material; a reactor into which the gas containing the carbon dioxide produced in the regeneration unit and hydrogen are introduced and which produces steam and at least one selected from the group consisting of synthetic fuel, methane, and methanol; and a steam introduction line that introduces at least part of the steam produced in the reactor, into the regeneration unit.

Disclosed herein is a sample gas filter assembly for a therapeutic gas delivery device. The sample gas filter assembly can have a filter apparatus, a water-permeable tubular membrane, and a ventilated cap. The sample gas filter assembly may be configured for maintaining a condensate pH from an assembly for humidity conditioning and filtering a sample gas in a therapeutic gas delivery device.