The disclosure provides a bifunctional composite membrane, a preparation method and use thereof, and a method for removing a plasticizer in liquor. The bifunctional composite membrane includes a supporting membrane and a dense layer which covers a surface of the supporting membrane, wherein the supporting membrane includes a filtering membrane and an adsorbent, and the adsorbent is dispersed in a pore structure of the filtering membrane.

A membrane is described for purifying or separating hydrogen from a multi-component gas stream such as syngas. This membrane uses a molecular pre-treatment, a transition metal, fluorine containing polymer, carbon fibers and carbon matrix sintered on a supportive screen. The membrane may be a bilayer membrane comprised of a layer containing high surface area carbon and another layer containing lower surface area carbon. Methods for purifying hydrogen are also described.

A membrane is described for purifying or separating hydrogen from a multi-component gas stream such as syngas. This membrane uses a molecular pre-treatment, a transition metal, fluorine containing polymer, carbon fibers and carbon matrix sintered on a supportive screen. The membrane may be a bilayer membrane comprised of a layer containing high surface area carbon and another layer containing lower surface area carbon. Methods for purifying hydrogen are also described.

The invention relates to a highly aligned and closely packed electrospun fiber assembly, wherein the fibers have at least an extension part or pore on the surface thereof. The invention also relates to a microtube array membrane (MTAM), comprising fiber assembly of the present disclosure. The invention also relates to the applications of these electrospun fiber assemblies in biological applications, and method of manufacturing these electrospun fiber assemblies.

The present invention relates to a process for the production of asymmetric cellulose hollow fibres and the use of such fibres in the production of asymmetric carbon hollow fibre membranes (CHFMs). In particular, the present invention provides a facile and scalable process for the preparation of asymmetric CHFMs by direct pyrolysis of polymeric precursors without the need for complex pre-pyrolysis treatment steps to prevent pore collapse. The present invention also relates to the use of asymmetric CHFMs prepared according to said process in the separation of hydrogen gas from a mixed gas source, especially in the separation of hydrogen from CO.sub.2 in the steam-methane reforming reaction.

An asymmetric hollow fiber (CMS) carbon molecular sieve is made by providing a dope solution comprised of a polvimide and a solvent, at a temperature greater than 250° C. that is less than the storage modulus at a temperature of 250° C., but no more than ten times less as measured using dynamic mechanical thermal analysis from 250° C. to a temperature where the polyimide carbonizes. The polvimide is shaped into a hollow polvimide fiber, the solvent removed and the polyimide hollow fiber is heated to pyroiyze the polvimide and form the asymmetric hollow carbon molecular sieve. The asymmetric hollow fiber carbon molecular sieve has a wall that is defined by an inner surface and outer surface of said fiber and the wall has an inner porous support region extending from the inner surface to an outer raicroporous separation region that extends from the inner porous support region to the outer surface. Surprisingly, when the polyimide has the particular storage modulus characteristics, the method allows for the hollow fiber CMS to be made without any pre-treatmenis or additives to inhibit stractural collapse of the inner microporous region.

A separation membrane complex includes a porous support, a dense part covering one surface of the support from a boundary position toward one side in a predetermined direction on the surface, and a separation membrane covering the surface from the boundary position toward the other side and covering the dense part in the vicinity of the boundary position. In a case where, in a cross section, within a specified range from the boundary position toward the one side in the predetermined direction up to 30 μm, a maximum angle among angles formed of the surface and lines connecting respective positions on a surface of the dense part on a side of the separation membrane and the boundary position is acquired as an evaluation angle, a maximum value of four evaluation angles at four measurement positions is not smaller than 5 degrees and not larger than 45 degrees.

The present invention relates to a membrane (M) comprising an amorphous polymer (P) comprising repeat units of the formulas (RU1), (RU2) and (RU3). Moreover, the present invention relates to a process for the preparation of said membrane (M) and a filtration process, wherein a liquid permeates said membrane (M).

An object of the present invention is to provide a polyamide porous membrane having improved fluid permeation performance. A polyamide porous membrane having a dense layer formed on at least one surface, wherein the polyamide porous membrane has a streak-like recessed portion extending in one direction of a surface of the dense layer, and the streak-like recessed portion has an orientation angle of 0 to 5.0° or 175.0 to 180.0° and an orientation intensity of 1.5 to 2.0 according to predetermined orientation analysis.

A hollow fiber membrane of the present invention is a hollow fiber membrane having an outer surface and an inner surface, wherein the inner surface has a zebra stripe pattern in which dense portions and porous portions are alternately formed in the longitudinal direction, and the outer surface has a maximum pore size of about 1 μm or less (≤about 1 μm), and wherein the hollow fiber membrane has a water permeability (flux) of ≥about 1,300 LMH/bar to ≤about 5,000 LMH/bar.