The present invention relates to a composite membrane comprising at least one 2D material and an inorganic porous material. The composite membrane described herein may be housed within a separation device which may be used for selective permeation of one or more gaseous compounds.

A process is provided to separate a hydrocarbon stream comprising a mixture of light olefins and light paraffins, the process comprising sending the hydrocarbon stream through a pretreatment unit to remove impurities selected from the group consisting of sulfur compounds, arsine, phosphine, methyl acetylene, propadiene, and acetylene to produce a treated hydrocarbon stream; vaporizing the treated hydrocarbon stream to produce a gaseous treated hydrocarbon stream; adding liquid or vapor water to the gaseous treated hydrocarbon stream; then contacting the gaseous treated hydrocarbon stream to a membrane in a membrane system comprising one or more membrane units to produce a permeate stream comprising about 96 to 99.9 wt % light olefins and a retentate stream comprising light paraffins.

Disclosed herein are asymmetric multilayer carbon molecular sieve (CMS) hollow fiber membranes and processes for preparing the membranes. The processes include simultaneously extruding a core dope containing a polymer and suitable nanoparticles, a sheath dope, and a bore fluid, followed by pyrolysis of the extruded fiber.

The two-dimensional metal carbide desalination membrane includes a stack of two-dimensional metal carbide layers. A two-dimensional metal carbide included in the two-dimensional metal carbide layers may have the formula Ti.sub.3C.sub.2T.sub.x, where T represents a terminating functional group, and x represents a number of the terminating functional groups. The terminating group may be oxygen, hydroxide (OH), fluorine or combinations thereof. The two-dimensional metal carbide desalination membrane includes nano-channels which are selectively permeable to ions. The two-dimensional metal carbide desalination membrane is selectivity permeable to a number of different cations, including Li.sup.+, Na.sup.+, K.sup.+, Mg.sup.2+, Ca.sup.2+, Ni.sup.2+ and Al.sup.3+, with counter Cl.sup. anions. Permeation rates depend on the charges of the cations and the ions' hydrated radius, with a critical point around 4.0 . The two-dimensional metal carbide desalination membranes can be used as desalination and/or water filtration membranes.

The invention relates to membranes, membrane modules, and applications therefor. In particular, the invention relates to the construction of membranes and membrane modules for use in osmotically driven membrane processes.

An ion-exchange membrane is disclosed here including ion-permeable layers impregnated with an ion-exchange material and arranged in an order from one face of the membrane to the opposite face of the membrane such that opposing layers in the supporting membrane substrate provide sufficiently identical physical properties to substantially avoid irregular expansion when in a salt solution. The ion-permeable layers including at least one non-woven layer and at least one reinforcing layer.

A membrane desalination system includes a housing, an electrically conductive membrane disposed within the housing, wherein the electrically conductive membrane includes a porous support and an electrically conductive layer disposed on the porous support, and the electrically conductive layer includes nanostructures, and an alternating current power source connected to the electrically conductive membrane.

Disclosed herein are systems and methods for regenerating media in a siloxane removal system. In particular, the present disclosure relates to a method for regenerating an adsorption medium, comprising receiving a source gas stream comprising at least one hydrocarbon and carbon dioxide; separating the source gas stream into a carbon dioxide-rich gas stream, and a substantially carbon dioxide-free gas stream; directing the carbon dioxide-rich gas stream into a regeneration vessel containing an adsorption medium having one or more adsorbed impurities on the adsorption medium; desorbing impurities from the adsorption medium by contacting the adsorption medium with the carbon dioxide-rich gas stream to generate a carbon dioxide-rich gas containing desorbed impurities and a regenerated adsorption medium; and directing the carbon dioxide-rich gas stream containing desorbed impurities out of the regeneration vessel.

A separation membrane structure comprises a porous support, and a separation membrane formed on the porous support. The separation membrane has an average pore diameter of greater than or equal to 0.32 nm and less than or equal to 0.44 nm. The separation membrane includes addition of at least one of a metal cation or a metal complex that tends to adsorb nitrogen in comparison to methane.

This invention provides a new facilitated transport membrane comprising a relatively hydrophilic, very small pore, nanoporous support membrane, a hydrophilic polymer inside the very small nanopores on the skin layer surface of the support membrane, a thin, nonporous, hydrophilic polymer layer coated on the surface of the support membrane, and metal salts incorporated in the hydrophilic polymer layer coated on the surface of the support membrane and the hydrophilic polymer inside the very small nanopores, a method of making this membrane, and the use of this membrane for olefin/paraffin separations, particularly for C3=/C3 and C2=/C2 separations.