Advanced Membrane Materials for Enhanced RO Efficiency

Reverse osmosis membrane with high durability and desalination performance. The membrane has a polyamide layer followed by a zeolite layer on top. The zeolite layer provides protection against chemical degradation of the polyamide layer during desalination. The zeolite layer can be formed by attaching zeolite seeds to the polyamide surface and then growing the zeolite in a solution containing lower concentrations of alkali ions compared to traditional methods. This allows higher zeolite deposition rates and prevents polyamide degradation.

Source

Composite semipermeable membrane for desalination and water generation with improved performance compared to conventional membranes. The membrane has a unique pleated structure with protrusions in the separation layer. This structure increases the actual thickness of the thin film and surface area of protrusions, allowing higher water flux and salt rejection compared to flat membranes. The protrusions have specific height and angle distributions. The membrane is formed by interfacial polycondensation of polyfunctional amine and acid halide solutions. The compound (I) used in the polycondensation moderates the amine concentration gradient during film formation, leading to protrusion growth and thicker thin films.

Source

High pressure filtration membranes for applications like reverse osmosis that can withstand high pressures without collapsing. The membranes contain a porous layer made of a specific combination of aromatic sulfone polymer and polyphenylene polymer. The membranes are produced by casting a composition containing the polymers and a solvent, then solidifying it. The membranes can be used to filter fluids like saltwater at high pressures without collapsing due to the unique polymer combination.

Source

A thin, low-pressure reverse osmosis membrane for domestic water treatment that balances salt removal and water yield. The membrane consists of three layers: a high-density polyethylene porous support, a polysulfone ultrafiltration layer, and a thin cross-linked aromatic polyamide reverse osmosis layer. The composite membrane is formed by heat sealing the ultrafiltration layer onto the support, then coating the reverse osmosis layer on top. The membrane thickness is less than 150 microns. This design enables high salt rejection and water yield for domestic applications.

Source

A composite reverse osmosis membrane with improved fouling resistance for desalination applications. The membrane has a porous support layer, a separation functional layer containing polyamide, and a coating layer. The coating layer has a low water contact angle (40° or less) and low protein adsorption force (0.4 nN or less). This coating configuration reduces fouling compared to conventional membranes, allowing stable long-term desalination performance.

Source

Reverse osmosis membrane for water filtration with improved salt and organic rejection. The membrane has a support layer followed by an active layer containing a silicone additive and a fluorine-based additive. The added silicone and fluorine reduce surface tension of the aqueous solution during membrane formation, improving wetting and adhesion to the support layer. This improves salt rejection compared to conventional membranes. The membrane also has good organic rejection, with IPA removal rates of 94-95% under test conditions.

Source

A novel reverse osmosis membrane for desalination with improved performance, cost, and longevity compared to conventional membranes. The membrane is made of multiple layers stacked together. The inner layers are conventional reverse osmosis membranes made of polymers. The outer layers are carbon fiber grid membranes. Soaking the composite membrane in a sodium bisulfite solution for 2-6 hours improves performance. The carbon fiber grid membranes provide mechanical strength and support while allowing water flow through the polymer layers. This structure reduces thickness, improves desalination rate, and extends membrane life compared to single-layer membranes.

Source

Composite membranes for membrane distillation (MD) that improve flow rates and durability compared to traditional MD membranes. The composite membranes have a hydrophilic layer sandwiched between hydrophobic layers. The hydrophobic outer layers prevent water intrusion and reduce mass transfer resistance. The inner hydrophilic layer is thicker to reduce heat conductance. This composition provides higher flow rates and durability for MD applications.

Source

Wide-runner reverse osmosis membrane for desalination with improved anti-fouling properties and higher water recovery. The membrane has a wide flow channel on the dense water side to slow pollutant accumulation and reduce fouling. The channel has separate first and second flow paths. The wider channel improves water quality by reducing fouling and allowing higher water recovery compared to standard reverse osmosis membranes. The wider channel is achieved by thickening the dense water layer in that area. The membrane also has a central core tube with permeation holes for water flow. This allows concentrated water to be separated and guided out separately from the product water. The wider flow channel, core tube, and permeation holes improve membrane performance and fouling resistance compared to standard reverse osmosis membranes.

Source

Highly durable reverse osmosis membrane for water desalination with improved cleaning and long life compared to conventional membranes. The membrane has optimized bonding between the support layer and the selective layer to prevent peeling during cleaning and operation. The bonding force is 20-1100gf. This reduces durability loss during cleaning while maintaining salt rejection. The membrane also has specific polymer compositions and solvent ratios. The sequential layers are a porous support, polymer support, and hydrophilic selective layer. The selective layer has amine functional groups and halogen compounds for interfacial polymerization.

Source

Forward osmosis membrane with high water permeation volume and reduced solute concentration polarization for efficient forward osmosis treatment. The membrane has a thin semi-permeable membrane layer on a porous polyketone support layer. The support layer is made of polyketone with large pores to minimize solute buildup. This allows more water to permeate through the membrane. The thin membrane exhibits semi-permeable behavior. The large pore size of the support layer reduces interior concentration polarization. This improves membrane performance for forward osmosis applications.

Source

Reverse osmosis membrane for osmotic backwashing that can maintain membrane performance and lifespan after backwashing. The membrane has a unique structure with a sulfonated polysulfone-based polymer compound in the first support layer. This prevents peeling during high-pressure backwashing compared to conventional membranes. The sulfonated polymer improves bonding between the support and membrane layers. It also reduces fouling and improves salt rejection. The membrane is made by treating a sulfonated polymer solution on the support first, then a second polymer solution.

Source

A reverse osmosis membrane for water purification applications that provides high rejection of impurities while maintaining high water permeability at low pressures. The membrane consists of a polymer microporous support layer and a thin polyamide separation layer directly coated onto the support. The support is made of a polymer microporous membrane. The polyamide layer is formed by interfacial polymerization of an amine and acid halide solution on the support. The membrane has a thickness of 5-150 μm, rejection of 60% or more at 1.0 MPa, and water permeability of 2.0 L/m^2/hr or more.

Source

Highly durable and anti-fouling reverse osmosis membranes for water purification systems that have extended life and resistance to fouling. The membranes have a specialized desalination layer made of fragrant polyamides. The fragrant polyamides contain compounds like furfuryl alcohol, trihydroxyethyl isocyanates, and m-phenylene diamine. This layer improves membrane fouling resistance and longevity compared to traditional reverse osmosis membranes.

Source

Composition for forming a protective layer on reverse osmosis membranes that improves salt rejection and boron removal while maintaining high flow rates. The composition contains a specific polymer with a weight average molecular weight of 500,000 to 700,000. This polymer forms a protective layer on the membrane surface to prevent fouling and contamination. The protective layer thickness is 100-300 nm. The composition can also include a hydrophilic polymer, crosslinking agent, and water.

Source

High-performance reverse osmosis membrane for desalination that improves both flow rate and salt rejection compared to conventional membranes. The membrane structure includes a porous support layer with carbon nanotubes and a polyamide layer on top. The carbon nanotubes in the support layer enhance its properties. The membrane is made by doping a polymer solution with carbon nanotubes to form the support layer, then coating and polymerizing an amine solution followed by an acid halide solution to form the polyamide layer. This improves the flow rate and salt rejection compared to just the polyamide layer.

Source

Water treatment membrane with improved permeation flux for applications like reverse osmosis. The membrane is made by forming a polyamide active layer on a porous support using interfacial polymerization of an aqueous solution containing an amine and an organic solution containing an acyl halide. The aqueous solution contains a flux enhancer with at least 3 acetic acid groups. This enhancer improves the permeate flow rate compared to conventional amine-acid combinations. The membrane can be used in water treatment modules for processes like desalination.

Source

A gas separation membrane with improved performance at high pressures. The membrane has a separation active layer on a porous substrate made of an organic polymer resin and inorganic particles. The key to the high-pressure separation is controlling the contact angle of water on the active layer side. The contact angle should be 35° to 95°. This allows sufficient permeation of gases while preventing membrane deformation and rupture at high pressures.

Source

Reverse osmosis membrane with improved fouling resistance for high concentration feeds like seawater. The membrane composition is a composite with a polyamide selective layer on a support. The polyamide layer has a unique surface chemistry that prevents fouling by organic and inorganic contaminants. The fouling resistance is achieved without needing pre-treatment or coating steps. The composition involves a specific polyfunctional amine and polyfunctional acyl halide used in the interfacial polymerization to form the polyamide layer. This chemistry provides a surface with enhanced fouling resistance compared to conventional polyamide membranes.

Source

A reverse osmosis membrane with improved water purification performance and durability. The membrane has a polysulfone layer with controlled pore distribution, size, and density. The polysulfone layer is formed using a mixed solvent with two solvents having different solubility parameters. This adjusts the outflow rates of the solvents during membrane formation to create the desired pore characteristics. The result is a membrane with reduced large pores (<0.5% over 40 nm), high initial flux, and superior salt rejection compared to conventional membranes.

Source