A composite pervaporation laminate incorporates a thin hydrophilic film laminated on a formable macroporous support layer. The method for making the membrane involves solution casting a thin film on a carrier substrate and transferring the said film onto a macroporous support by hot pressing, such as by decal transfer. Ultra-thin defect-free film, such as less than 5 micrometers, are laminated using this method to achieve very high-water transmission rates and very low or zero gas permeation. The membrane can then be formed into a three-dimensional structure by pleating or corrugating to increase the surface area. The membrane can be used as spacers in an ERV application.

A composite pervaporation laminate incorporates a thin hydrophilic film laminated on a formable macroporous support layer. The method for making the membrane involves solution casting a thin film on a carrier substrate and transferring the said film onto a macroporous support by hot pressing, such as by decal transfer. Ultra-thin defect-free film, such as less than 5 micrometers, are laminated using this method to achieve very high-water transmission rates and very low or zero gas permeation. The membrane can then be formed into a three-dimensional structure by pleating or corrugating to increase the surface area. The membrane can be used as spacers in an ERV application.

Apparatuses and methods for fabricating thin film composite hollow fiber membranes. In some implementations, an apparatus is used to remove excess first solution from a hollow fiber that has been immersed in a first solution. In some implementations, the method and apparatuses include flowing a gas, for example, compressed gas or ambient air, past a surface of a hollow fiber that has been immersed in a first solution prior to immersion in a second solution. In some implementations, the gas is flowed past the surface under positive pressure, while in other implementations the gas is flowed under negative pressure, for example, vacuum. The apparatuses and devices can be used to produce thin film composite hollow fiber membranes without pressing or damaging the hollow fiber.

The disclosure provides composite membranes for use in water purification and filtration.

The disclosure provides composite membranes for use in water purification and filtration.

Novel low-pressure nanofiltration membrane composites for rejecting organic compounds are prepared by interfacial polymerization on a microporous hollow fiber supporting membrane. The interfacial polymerization reaction is carried out using an essentially monomeric polyamine reactant having at least two amine functional groups per molecule, and an essentially monomeric amine-reactive polyfunctional aromatic or cycloaliphatic acyl halide having at least two acyl halide groups per molecule. The composite can be fabricated by stepwise polymerization reactions with different reactant recipes at each step.

Novel low-pressure nanofiltration membrane composites for rejecting organic compounds are prepared by interfacial polymerization on a microporous hollow fiber supporting membrane. The interfacial polymerization reaction is carried out using an essentially monomeric polyamine reactant having at least two amine functional groups per molecule, and an essentially monomeric amine-reactive polyfunctional aromatic or cycloaliphatic acyl halide having at least two acyl halide groups per molecule. The composite can be fabricated by stepwise polymerization reactions with different reactant recipes at each step.

Provided is a method for producing a one-liquid stabilized hypobromous acid composition which contains substantially no bromate ions, has excellent sterilization performance, exhibits almost no corrosiveness relative to metals, and displays excellent storage stability. This method for producing the stabilized hypobromous acid composition includes a step in which a reaction is induced by adding, under an inert gas atmosphere, bromine to a mixed solution including water, an alkali hydroxide, and sulfamic acid, wherein the proportion of bromine added is not more than 25 wt % relative to the total weight of the composition.

Provided is a method for producing a one-liquid stabilized hypobromous acid composition which contains substantially no bromate ions, has excellent sterilization performance, exhibits almost no corrosiveness relative to metals, and displays excellent storage stability. This method for producing the stabilized hypobromous acid composition includes a step in which a reaction is induced by adding, under an inert gas atmosphere, bromine to a mixed solution including water, an alkali hydroxide, and sulfamic acid, wherein the proportion of bromine added is not more than 25 wt % relative to the total weight of the composition.

The present invention relates to a method for manufacturing a water treatment separation membrane, the method including: forming an aqueous solution layer including an amine compound on a porous support; and bringing an organic solution including an acyl halide compound into contact with on the aqueous solution layer to form a polyamide active layer, in which the organic solution includes a non-polar solvent and an amphiphilic solvent having a boiling point of 120° C. or more, thereby improving a permeation flux, and a water treatment separation membrane manufactured by the manufacturing method.