A gas separation system for controlling a concentration of a first gas species and a second gas species in an outlet gas comprises a splitter unit. The splitter unit comprises a gas membrane system having a gas inlet port. The gas inlet port is in fluid connection with an air intake. A membrane is a selective barrier and allows some things to pass through but stops others.

Plant and method for the separation of a gas mixture containing a plurality of gaseous components, comprising first and second membrane-based separation stages and a third gas separation stage with adsorption with oscillating pressure, the first, second and third gas separation stages acting in combination to obtain a first final flow of gas enriched in a first component of the initial gas mixture, for example methane, and a second final flow of gas, enriched in a second component of the initial gas mixture, for example carbon dioxide.

Disclosed herein is a gas separation section for separating a first gas from one or more other gasses in a separation device, the gas separation section comprising: a first membrane that is substantially planar; a second membrane that is substantially planar; a first substrate that has a first surface and a second surface, wherein the second surface of the first substrate is on an opposite side of the first substrate than the first surface of the first substrate; a second substrate that has a first surface and a second surface, wherein the second surface of the second substrate is on an opposite side of the second substrate than the first surface of the second substrate; and a mesh that is arranged between the second surface of the first substrate and the second surface of the second substrate; wherein: the first substrate and the second substrate are sintered plates; the first membrane is on the first surface of the first substrate; the second membrane is on the first surface of the second substrate; the first and second membranes are both permeable by at least a first gas and not permeable by one or more other gasses; the thickness of the first membrane in a direction orthogonal to the plane of the first membrane is less than 10 micrometres; and the thickness of the second membrane in a direction orthogonal to the plane of the second membrane is less than 10 micrometres. Embodiments provide an improved gas separation device over known techniques. Advantages of the separation device according to embodiment include improved performance, easy implementation, a modular design and a scalable design.

An apparatus utilizes a membrane unit to capture components from atmospheric air, including carbon dioxide, enriches the carbon dioxide concentration, and delivers the enriched concentration of carbon dioxide to a sequestering facility. The membrane is configured such that as a first gas containing oxygen, nitrogen and carbon dioxide is drawn through the membrane, a permeate stream is formed where the permeate stream has an oxygen concentration and a carbon dioxide concentration higher than in the first gas and a nitrogen concentration lower than in the first gas. A permeate conduit, having a vacuum applied to it by a vacuum generating device receives the permeate stream and a delivery conduit delivers at least a portion of the enriched carbon dioxide to a sequestering facility. The apparatus may comprise a component of a system where the system may have a flue gas generator and/or a secondary enrichment system disposed between the vacuum generating device and the sequestering facility.

The present invention relates to a system and method for separating and recovering hydrogen from coke oven gas (COG) in steel industry, particularly a system and method for separating and recovering hydrogen at a concentration of 99.9% by volume or more from coke oven gas (COG) in steel industry with a recovery rate of 95% or more.

An energy efficient process for NGL recovery and production of compressed natural gas (CNG) in which natural gas is fed to a first gas separation membrane-based separation stage where it is separated into a permeate and a retentate. The high C.sub.3+ concentration first stage permeate is chilled and separated to provide liquid phase NGL and a gaseous phase. The first stage retentate is separated at a second gas membrane-based separation stage to produce a retentate meeting pipeline specifications for CNG (including hydrocarbon dewpoint) and a permeate that is recycled to the first stage. The gaseous phase, constituting a low BTU fuel, may be used in on-site power generation equipment and/or in internal combustion engines. The second stage permeate (and optionally the third stage retentate) is (are) recycled back to the first stage to enhance the production of NGL and CNG. The gaseous phase may instead be fed to a third stage to produce a third permeate and a third residue, in which case the third permeate is recycled to the first stage and the third retentate is a low BTU fuel which may be used in on-site power generation equipment and/or in internal combustion engines.

A natural gas processing system is mounted on a mobile platform that is transported to a natural gas source, such as a well. The system supplies retentate gas to operate multi-fuel engines for wellfield equipment such as pumps, compressors, and drills. A liquid drain discharges contaminants. A separator, first and second coalescing filters, and a particulate filter remove particulate matter and fluid contaminant matter from the natural gas. A dryer removes water vapor from the natural gas. Dual membranes separate the natural gas into a retentate gas and a permeate gas. A first heat exchanger adjusts temperature of the natural gas entering the membranes. A second heat exchanger adjusts temperature of the retentate gas output. A thermoelectric generator powered by the natural gas supplies process electricity. A process control monitors and controls the natural gas processing system, including pressure control valves, temperature control valves, and emergency shutdown systems. An instrument gas supply with an accumulator supplies gas pressure to operate pneumatic valves and instruments.

A thin film composite gas separation membrane comprising a polyether block amide copolymer coating layer and a nanoporous asymmetric support membrane with nanopores on the skin layer surface of the support membrane and gelatin polymers inside the nanopores on the skin layer surface of the support membrane. A method for making the thin film composite gas separation membrane is provided as well as the use of the membrane for a variety of separations such as separations of hydrogen sulfide and carbon dioxide from natural gas, carbon dioxide removal from flue gas, fuel gas conditioning, hydrogen/methane, polar molecules, and ammonia mixtures with methane, nitrogen or hydrogen and other light gases separations, but also for natural gas liquids recovery and hydrogen sulfide and carbon dioxide removal from natural gas in a single step.

The disclosure provides a method and system for extracting carbon dioxide from an exhaust gas. The method includes lowering a temperature of an exhaust gas using a heat exchanger, lowering a concentration of a particulate matter within the lowered temperature exhaust gas, and passing the lowered particulate concentration and lowered temperature exhaust gas through one or more membrane modules to produce a membrane module permeate flow that contains a higher concentration of carbon dioxide compared to a concentration of carbon dioxide in the lowered particulate concentration and lowered temperature exhaust gas. Further, the system includes a heat exchanger fluidly coupled to a particulate filter that is configured to lower a concentration of the particulate matter within the exhaust gas, and one or more membrane modules fluidly coupled to the particulate filter and configured to produce the membrane module permeate flow.

Disclosed are a facility and a method using the facility for treating a feed gas stream comprising at least methane and carbon dioxide by membrane permeation, the facility comprising: —a first membrane separation unit capable of receiving the feed gas stream and providing a first permeate and a first retentate, —a second membrane separation unit capable of receiving the first retentate and providing a second permeate and a second retentate, —a compressor for compressing the first permeate to a pressure of between 17 bar and 25 bar, —a means for cooling the first compressed permeate to a temperature lower than −40° C., —a distillation column for separating the first cooled permeate into a gas stream and a liquid stream, —at least one means for recycling the gas stream exiting the distillation column to the inlet of the first membrane separation unit, —a means for measuring the concentration of methane and/or carbon dioxide in the gas stream exiting the distillation column, —a means for comparing the concentration of methane and/or carbon dioxide measured by the measurement means with a target value, and —a means for adjusting the pressure and/or the temperature of the first permeate depending on the comparison carried out by the comparison means.