37 results about "Permeance" patented technology

The present invention discloses method for making defect-free high performance mixed matrix membranes (MMMs) containing a continuous polymer matrix and dispersed molecular sieves such as AlPO-14 or UZM-5. These MMMs can be used for separations. The novel method for making defect-free high performance MMMs comprises: post treating the MMM at a temperature ≧150° C. This new method results in a MMM with either no macrovoids or voids of less than 5 angstroms at the interface of the continuous polymer matrix and the molecular sieves. The MMMs are in the form of symmetric dense film, thin-film composite (TFC), asymmetric flat sheet or asymmetric hollow fiber. These MMMs have good flexibility and high mechanical strength, and exhibit high carbon dioxide/methane (CO₂/CH₄) selectivity and high CO₂ permeance for CO₂/CH₄ separation. The MMMs are suitable for a variety of liquid, gas, and vapor separations.

A syngas cleanup section includes a water-gas shift reactor, a first operation unit and a second operation unit. The first operation unit includes a high permeance membrane with H₂/CO₂ selectivity in flow communication with the water-gas shift reactor to provide a H₂-rich permeate stream and an H₂-poor retentate stream. The second operation unit recovers H₂ and CO from the retentate stream to produce a single, CO₂-rich product stream, the entire content of which has a minimum pressure of at least about 10.0 bar. In one embodiment, the second operation unit includes a membrane with Knudsen selectivity for permeating H₂, CO and CO₂. In this embodiment, the permeate streams are combined to produce a H₂ and CO-rich fuel stream used by a combined cycle power generation unit to produce electricity, and the retentate stream is sent to a catalytic oxidation unit to produce the CO₂-rich product stream. In another embodiment, the second operation unit is the catalytic oxidation unit.

A micro rotor is disclosed and includes a plurality of circular or annular plate-shaped thick film magnets which each include an isotropic magnet with a thickness t₁ having an in-plane remanence Mr of 0.95 T or more and a coercivity HcJ of 400 kA/m and a non-magnetic material with a thickness t₂ adapted to isolate two adjacent isotropic magnets where the ratio of t₁/t₂ is eight or more and which are stacked on one another in multiple layers in the rotation axis direction, wherein at least two pole pairs are provided and a mean magnetic path of in-plane direction having a permeance (B/μoH) of five or more achieved by the magnet alone is provided, whereby eddy current is reduced. Also disclosed are a radial gap type brushless DC motor, a PM stepping motor and an electric generator which incorporate the above described micro rotor.

The present invention provides high permeance copolyimide membranes and methods for making and using these membranes for gas separations such as for hydrogen purification and for acid gas removal from natural gas. The random copolyimide polymers used to make the copolyimide membrane may be UV crosslinked to improve selectivity in separating mixtures of gases or in purifying liquids. The membranes may be fabricated into any known membrane configuration such as a flat sheet or a hollow fiber.

The invention relates to a water vapor permeance resistant silicone sealant and a manufacture method thereof, which belong to the technical field of polymer sealing materials. The water vapor permeance resistant silicone sealant comprises the following raw materials in parts by weight: 100 parts of alpha, omega-dihydroxydimethylpolysiloxane, 10 to 12 parts of acrylic ester, 0.5 to 0.8 part of catalyst A, 0.8 to 1.2 parts of catalyst B, 50 to 100 parts of dimethyl silicone polymer, 50 to 100 parts of magnesium hydrate, 50 to 100 parts of aluminium hydroxide, 3 to 6 parts of fumed silica, 11 to 15 parts of cross linker and 2 to 3 parts of silane coupling agent. The water vapor permeance resistant silicone sealant has the advantages of effectively inhibiting the permeance of water vapor (the permeance rate of the water vapor is less than 1), improving the flame resistance, producing no monomer separation phenomenon in the curing process and after curing, and having ideal weather resistance and corrosion resistance. The recommended manufacture method has simple process, few requirements on technique and equipment, and causes no pollution to the environment in the preparing process.

The invention discloses a permanent magnet type motor modeling and demagnetization performance analysis method of an asymmetric magnetic network. The permanent magnet type motor modeling and demagnetization performance analysis method of an asymmetric magnetic network includes the steps: connecting a fixed permeance network model, an air gap permeance network model and a permanent magnet permeancenetwork model in series and in parallel according to corresponding positional relationships so as to be synthesized into a permeance network model of the entire motor; listing a node magnetic potential equation of the permeance network model of the whole motor, obtaining the magnetic flux of the permanent magnet through calculation according to a node magnetic pressure equation, and obtaining themagnetic density of any point of the permanent magnet through calculation; and determining demagnetization by comparing the magnetic density of the permanent magnet B(x) with the magnetic density B(X0) at the knee point X0 of the demagnetization B-H curve of the permanent magnet. Therefore, the permanent magnet type motor modeling and demagnetization performance analysis method of an asymmetric magnetic network can accurately analyze the demagnetization situation of the motor, can save the time, and can improve the design efficiency.

The invention relates to semi-transparent silicon nitride ceramic, which is characterized in that it comprises raw material with their mass proportion as alpha-Si3N4 powder 82-95, Al2O3 powder 2-8, and MgO powder or the mixture of MgO powderand Y2O3 powder 2-10; wherein, when using MgO powder and Y2O3 powder, the added mass of Y2O3 is more than zero but not larger than half total mass of MgO powder and Y2O3 powder. This product has lowest relative density larger than 97% near to theoretical value; the particle has even size with equiaxed alpha-Si3N4 phase as main, and the infrared permeance rate is 30%-45%.

A method of making a membrane permeable to hydrogen gas (H₂↑) is disclosed. The membrane is made by forming a palladium layer, depositing a layer of copper on the palladium layer, and galvanically displacing a portion of the copper with palladium. The membrane has improved resistance to poisoning by H₂S compared to a palladium membrane. The membrane also has increased permeance of hydrogen gas compared to palladium-copper alloys. The membrane can be annealed at a lower temperature for a shorter amount of time.

A super high permeance and high selectivity dual layer rubbery polymeric membrane comprising a thin selective layer of a fumed silica reinforced, cross-linked polyorganosiloxane on top of a porous glassy polymer support membrane and a thin selective layer of a chemically cross-linked polyorganosiloxane rubbery polymer on top of the thin selective layer of a fumed silica reinforced, cross-linked polyorganosiloxane, and a porous glassy polymer support membrane that is formed from a glassy polymer and the processes of making these membranes and using these membranes in separating mixtures of two or more gases or liquids.

The invention provides a calculation method, a judgment method, a selecting method and a selecting device. The judgment method for judging kinds of materials which is used for forming a to-be-detected object comprises the following steps: emitting X-ray to the to-be-detected object, and detecting permeance strength of low-energy X-ray and permeance strength of high-energy X-ray; for the to-be-detected object, calculating a relationship between a difference value obtained by performing weighted difference on the permeance strength of low-energy X-ray and the permeance strength of high-energy X-ray and a weight coefficient used for the weighted difference; and based on a plurality relationships respectively corresponding to a plurality of reference objects of which kinds of the material are known and different with each other and a relationship corresponding to the to-be-detected object, judging the kind of material for forming the to-be-detected object.

A segmented insulative device and related kit for insulating components of a thermal distribution system, and particularly chilled fluid systems. The kit includes a sheet of segmented insulation formed by a composite layer of segmented, flexible, pre-sewn insulation that is easily cut to size in the field using scissors, utility knives or other simple, hand-held cutting devices. The composite layer includes at least one outer layer of low permeance laminate devoid of stitching and adhered to the pre-sewn insulation. The kit also includes low permeance pressure-sensitive adhesive tape as fasteners, also easily cut to length, using hand-held devices. The low permeance laminate and the low permeance pressure-sensitive adhesive tape form a contiguous outer water vapor barrier free of stitching that would otherwise compromise low permeance. The segmented insulation and the fasteners are attached to one another in the field. This provides an installation kit that an installer can use to provide a versatile insulation in the form of the assembled segmented insulative device that insulates against heat gain to the chilled surface and retards the intrusion of water vapor into the insulation as well as to the chilled surface. The segmented insulative device lends itself to quick customization on-site rather than requiring costly off-site manufacture or pre-assembly and subsequent quick installation on the pipe component requiring thermal installation.

A method for quickly modeling the suspension force of a rotor of a bearingless flux-switched motor is provided. The method comprises the steps of calculating the air-gap permeance Lamdas (theta) whenthe rotor is smooth, and the air-gap permeance Lamdas (theta, theta r) when the stator is smooth, and calculating the air-gap permeance Lambda sr (theta1 theta r) according to the air gap length g, Lamdas (theta), and Lambda sr (theta1 theta r); obtaining the magnetomotive force of the permanent magnet and the phase current at the air gap by using the stator and rotor Carter coefficients. Magneticdensity generated by permanent magnet and phase current at air gap is calculated by air gap magnetomotive force and air gap permeability respectively. The sum of the air gap flux densities generatedby the power part of the permanent magnet and the phase current is calculated as the bias magnetic field in the levitation force calculation, and the air gap flux densities generated by the levitationpart of the phase current are calculated as the air gap modulated flux densities. A levitation force receive by that rotor is calculated by the air gap modulate magnetic density and the air gap biased magnetic density, and the modeling process of the levitation force of the rotor is complete.

The invention discloses a photovoltaic backboard chloride ion permeability testing method and device. The device comprises a permeating tank, a permeance tank, a conductivity electrode, two graphite electrodes and a conductivity meter. The permeating tank contains a high-concentration sodium chloride solution. The permeance tank contains a low-concentration sodium chloride solution. Stirrers are arranged in the permeating tank and the permeance tank. The permeating tank and the permeance tank are connected through a connecting cylinder transversely arranged. A photovoltaic backboard to be tested is vertically inserted into the middle of the connecting cylinder to partition the connecting cylinder into isolated left and right parts. The isolated left and right parts are communicated with the permeating tank and the permeance tank respectively. The conductivity electrode is located in the permeance tank and is close to the photovoltaic backboard. The conductivity meter is connected with the conductivity electrode. The two graphite electrodes are located in the permeating tank and the permeance tank respectively. The two graphite electrodes are connected with a voltage stabilizing power source. The device is simple in structure and capable of fast testing chloride ion permeability of the photovoltaic backboard. The invention discloses the testing method.