18 results about "Permselective membrane" patented technology

The invention discloses a local space oxygen enrichment control system and method based on an oxygen selective permeable membrane, belongs to the technical field of air purification, environment control and membrane separation, and aims to solve the problems that the indoor oxygen concentration cannot be actively and efficiently increased and compact integration is difficult in the prior art. The system integrates an outdoor fresh air fan, a switching valve, an oxygen enrichment membrane device, an air pump, an indoor air return and supply fan, a gas monitoring control unit, an outdoor exhaust fan and the like, and a control unit dynamically regulates and controls a switching valve passage, the rotating speed of each fan and start and stop of the air pump according to the difference between oxygen sensor data and preset target oxygen concentration; air selectively passes through the oxygen-enriched membrane device to generate oxygen-enriched air or is fed into a room through a bypass air path, and the indoor oxygen concentration is actively stabilized at 21%-26%. The system is suitable for local spaces such as residences and offices, active oxygen enrichment and environment control can be achieved, the air quality is improved, and meanwhile low energy consumption, safety and comfort are taken into account.

The embodiment of the invention discloses a sulfur hexafluoride online purification monitoring device, and relates to the technical field of high-voltage and ultrahigh-voltage electrics. The sulfur hexafluoride online purification monitoring device comprises a tank body, a selective permeable membrane and a purification monitoring assembly, the tank body is provided with an inner cavity, the selective permeable membrane is installed in the inner cavity and divides the inner cavity into a high-pressure side chamber and a low-pressure side chamber, the high-pressure side chamber is communicated with sulfur hexafluoride high-voltage electrical equipment, and the low-pressure side chamber is communicated with the purification monitoring assembly; sulfur hexafluoride in the sulfur hexafluoride high-voltage electrical equipment enters the high-voltage side cavity, the selective permeable membrane allows decomposition products of the sulfur hexafluoride and small air molecules to permeate into the low-voltage side cavity, the purification monitoring assembly monitors and purifies gas in the low-voltage side cavity and then discharges the gas, and the sulfur hexafluoride high-voltage electrical equipment does not need to be powered off. Therefore, the continuous operation in the operation state can be realized.

The invention relates to the technical field of optical fiber sensor processing, in particular to an optical fiber sensor for selectively detecting sodium ion concentration and a detection method of the optical fiber sensor. The sodium ion selective permeation membrane is prepared from a double-angstrom-scale limited cation defect type titanium dioxide / graphene oxide composite material, and electric field excitation is cooperatively applied, so that the time of sodium ion selective permeation is shortened; meanwhile, the concentration of the sodium ions in the to-be-detected liquid is detected through the SPR tilted fiber bragg grating, and the temperature change is sensed through cooperation of the fiber Bragg grating, so that the interference of the temperature change of the solution on the detection of the concentration of the sodium ions by the SPR tilted fiber bragg grating is eliminated. Therefore, the optical fiber sensor device disclosed by the invention has the technical advantages of good selectivity, fast response, temperature interference resistance, wide detection range and the like, and can be widely applied to accurate detection of sodium ion concentration in various solutions.

The invention relates to the technical field of preparation methods of alcohol-permeable membranes, and discloses a preparation method of a multi-separation-layer pervaporation preferential alcohol-permeable membrane, which comprises the following steps: by taking an ultrafiltration membrane as a supporting layer, coating an inner separation layer membrane casting solution on the supporting layer, and standing until a solvent is volatilized and preliminarily solidified; continuously coating the preliminarily cured membrane with the second separation layer membrane casting solution, and standing until the solvent is volatilized and preliminarily cured; then, stopping scraping the membrane or continuously scraping the membrane by adopting a third separation layer membrane casting solution, and standing until the solvent is volatilized and the membrane casting solution is cured; and carrying out heat treatment on the membrane obtained in the previous step to fully crosslink the membrane to obtain the high-performance composite membrane. Under the condition of limited types and separation performance of separation membrane materials, the separation layers prepared from the membrane materials are combined differently, so that the multi-separation-layer pervaporation membrane has dual selectivity and interface selectivity, the mass transfer resistance is reduced according to different densities of the separation layers prepared from different membrane materials, and the separation performance of the composite membrane is enhanced; separation factors are increased, and permeation flux is improved.

The utility model discloses a device for optimizing recovery solvent separation by analyzing tail gas V0Cs component change in the technical field of industrial waste gas treatment, which comprises an adsorption tower main body and a spray tower main body, one side of the adsorption tower main body is provided with a first connecting pipe, one side of the spray tower main body is provided with a second connecting pipe, and the first connecting pipe is connected with the second connecting pipe. A main pipe is arranged on one side of the first connecting pipe and the second connecting pipe, a filter and an infrared spectrometer are arranged on the surface of the main pipe, a water distribution pipe is arranged on the inner side of the spray tower main body, and by means of the arranged infrared spectrometer, when the concentration of VOCs in tail gas is detected to be high, an adsorption structure and a spray structure in the spray tower main body can be automatically started; the effect of separating VOCs in the tail gas is achieved, when the infrared spectrometer detects that the concentration of VOCs in the tail gas in the main pipe is low, the VOCs are introduced into the adsorption tower body, selective separation is conducted through the selective permeable membrane according to the polarity difference of the VOCs, and the solvent recovery effect is improved.

The invention discloses a local space deoxidation / hypoxia control system and method based on an oxygen selective permeable membrane. The system comprises a fan, a filter screen device, an oxygen selective permeable membrane assembly, an air return pipe, a differential pressure sensor, a pressure regulating valve, a sensor, a control unit, a vacuum pump, an oxygen discharge pipe, a three-way regulating valve and a hypoxia air return pipe. According to the system, closed-loop circulation deoxidation is achieved through membrane separation: a fan sucks air in a closed space into a membrane assembly for oxygen-nitrogen separation, oxygen separated by the membrane is discharged from an oxygen discharge pipe through a three-way valve under the action of a vacuum pump, and nitrogen-rich low-oxygen gas flows back to the space through an air return pipe; the sensor and the control unit monitor the oxygen concentration in real time and adjust the opening degrees of the vacuum pump and the three-way valve, so that the space oxygen concentration is maintained at a set low oxygen level. The system automatically generates a low-oxygen environment through a membrane separation principle, an external nitrogen making device is not needed, and the operation cost and the energy consumption are reduced.

The invention discloses an on-line mass spectrum sampling analysis system for measuring a high-humidity gas sample, and relates to the technical field of gas mass spectrum detection, the analysis system comprises an on-line sampling module, a primary water removal module, a secondary water removal module, a sample pretreatment module, a sample introduction interface module, a mass spectrum detection module and a reverse cleaning module, the on-line sampling module is communicated with the primary water removal module through a pipeline, and the primary water removal module is communicated with the secondary water removal module through a pipeline. According to the method, low-temperature cold trap water pre-removal and adsorption filler deep water removal are combined for the first time, and efficiency and thoroughness are both considered; inert coating treatment is performed on the inner walls of key components, so that adsorption and reaction of active components are reduced; a selective permeable membrane is introduced on the basis of water removal, so that the efficiency of the target component entering the mass spectrum is further improved; sampling, preprocessing, detection, data processing and alarming are integrated, and automation and remote monitoring are achieved. After secondary water removal, the gas enters the pressure and flow stabilizing module immediately, so that humidity rebound is reduced, and the stability of mass spectrometry conditions is ensured.

The application discloses a methanol purge gas hydrogen-carbon grading recovery process and system. The process first carries out dehydration and methanol removal treatment on the purge tail gas discharged from a methanol synthesis loop of a CO2 hydrogenation methanol device in sequence through a product separation condenser and a pretreatment unit, so that pretreated tail gas is obtained; then the pretreated tail gas is sent into a selective permeation membrane separation unit, and is separated by using a polyimide membrane, a polybenzimidazole membrane or a polyetherimide, so that hydrogen-rich permeation gas and CO2-rich non-permeation gas are obtained. The hydrogen-rich permeation gas is pressurized by a circulating compressor, and is returned to the inlet of a methanol synthesis loop compressor or a circulating gas pipeline; the CO2-rich non-permeation gas enters a CO2 pressure swing adsorption unit, and through a multi-bed adsorption, pressure equalization, desorption and regeneration cycle, CO2 product gas and hydrogen-containing tail gas are produced. The process realizes efficient grading recovery and resource utilization of hydrogen and carbon dioxide in the purge tail gas.

The present invention provides, inter alia, a lithium-selective transmission membrane with which it is possible to recover lithium ions without implementing a complicated process on the lithium-selective transmission membrane and to reduce the time and cost required for recovering the lithium ions. A lithium-selective transmission membrane 10 according to the present invention includes a sintered body of a lithium-ion conductor. The present invention is characterized in that at least some regions on the outer surface of the lithium-selective transmission membrane 10 are configured from surface-roughened processed surfaces 101.

What is provided is a metal ion recovery device including: a raw solution tank that is configured to store a metal ion containing raw solution including metal ions; a recovery liquid tank that is configured to store a metal ion recovery liquid including metal ions recovered from the metal ion containing raw solution; a metal ion selective permeable membrane that separates the raw solution tank and the recovery liquid tank and selectively transmits the metal ions; an anode that is arranged on a side of the metal ion selective permeable membrane close to the raw solution tank; a cathode that is arranged on a side of the metal ion selective permeable membrane close to the recovery liquid tank; a porous current collector that is formed of a conductive material; a first spacer that is configured to maintain a gap between the metal ion selective permeable membrane and the anode; and a second spacer that is configured to maintain a gap between the metal ion selective permeable membrane and the cathode, in which the anode is arranged to be electrically connected to the metal ion selective permeable membrane through the porous current collector, and the cathode is arranged to be electrically connected to the metal ion selective permeable membrane through the porous current collector, and two or more of at least one of the raw solution tank and the recovery liquid tank are provided.

The present application provides an electrochemical sensor and a method for testing metal ions by using the same, and relates to the technical field of water quality testing. The electrochemical sensor provided by the present application includes: a sensor body; sensing electrodes arranged on a surface of the sensor body, the sensing electrodes including a testing electrode, a reference electrode and a hydrogen ion indication electrode; an ion permselective membrane covering a surface of at least one of the testing electrode and the hydrogen ion indication electrode. According to the present application, the ion permselective membrane on the sensor body filters corresponding target hydrogen or metal ions in a solution. The hydrogen ion indication electrode measures a pH value of the solution and calibrate the concentration of tested ions based on the pH value, to reduce the interference of the pH value of the solution on measurement. The testing electrode tests the concentration of metal ions and calibrates the concentration of tested ions, to reduce the interference of interference ions on the tested ions, thereby enhancing the testing accuracy and stability.

The invention provides an electric membrane stack denitrification system, which relates to the field of wastewater treatment and comprises an electrolytic cell (100) consisting of an anode chamber (10), a to-be-purified chamber (20) and a cathode chamber (30), a selective permeable membrane (40) is arranged between the anode chamber (10) and the to-be-purified chamber (20), a preferential permeable membrane (50) is arranged between the to-be-purified chamber (20) and the cathode chamber (30), and the anode chamber (10) is communicated with the cathode chamber (30) through an external conduit (80); a composite modified titanium-based anode electrode (60) is arranged in the anode chamber (10), a modified stainless steel mesh cathode electrode (70) is arranged in the cathode chamber (30), and the anode electrode (60) and the cathode electrode (70) are electrically connected and located on the upper side of the electrolytic bath (100). According to the system, a three-chamber diaphragm structure is adopted, the characteristics of low conductivity, ammonia nitrogen enrichment and the like of the freshwater aquaculture wastewater are accurately matched, and rapid and efficient removal of ammonia nitrogen in the aquaculture wastewater is achieved.

A co-culture bioreactor is provided and comprises at least two chambers, each configured to house a distinct cell type in a shared culture medium and each having an inlet and an outlet for the shared culture medium. A selectively permeable membrane is associated with each of the at least two chambers and in fluid communication with the outlet of one chamber and an inlet of one or more other chambers. Each of the selectively permeable membranes is individually configured to prevent permeation of cells from the chamber it is associated with into the one or more other chambers whilst allowing culture medium and selected biomolecules to permeate therethrough. A pump is associated with each of the at least two chambers and is configured to circulate culture medium through the selectively permeable membrane and between the at least two chambers.

The application discloses a kind of local space oxygen-enriched control system and control method based on oxygen selective permeation membrane, belongs to air purification, environmental control and membrane separation technical field, for the problem that prior art cannot actively and efficiently improve indoor oxygen concentration and is difficult to compact integration.The system of the present application integrates outdoor fresh air fan, switching valve, oxygen-enriched membrane device, air pump, indoor return air and air supply fan, gas monitoring control unit, outdoor exhaust fan and other components, the control unit is based on the difference between oxygen sensor data and preset target oxygen concentration, dynamically regulates and controls switching valve passage, fan speed and air pump start-stop, selectively makes air through oxygen-enriched membrane device to produce oxygen-enriched air or through bypass air path into indoor, actively stabilizes indoor oxygen concentration at 21% to 26%.The system is suitable for residential, office and other local space, can realize active oxygen-enriched and environmental control, improve air quality while taking into account low energy consumption and safety and comfort.

The invention discloses a continuous esterification reaction system and a system and method for preparing an antioxidant DLTDP. The system comprises a feeding unit, a reaction and dehydration unit, a conduction oil temperature control unit and a product collection unit. The method is characterized in that a tubular membrane reactor with a built-in solid acid catalyst is adopted, and a selective permeable membrane made of a polyether sulfone material is integrated on the wall of the tubular membrane reactor, so that moisture generated by reaction can be selectively removed; in cooperation with the negative pressure dehydration unit, water molecules are continuously removed in the reaction process, and the reaction equilibrium limitation is broken. The method comprises the following steps: raw material melting pretreatment, premixing in a static mixer, continuous catalytic esterification reaction at 80-150 DEG C, membrane separation and negative pressure dehydration, and product collection. The method provided by the invention realizes full-process continuous production, obviously improves the reaction efficiency, the product yield and the product purity, and has the advantages of high production efficiency, stable product quality, low energy consumption and environmental protection.

Disclosed are systems for and methods of gas separation using selective permeability, including dehumidification. Envelopes and membranous partitions for use in such systems and methods are also disclosed. A dehumidifying system for a building is further disclosed having a membrane separation unit. The membrane separation unit has a membranous partition, with a selectively permeable membrane (12). Air is supplied along ducting from the building interior to a feed gas inlet on one side of the membrane; and retentate air is recirculated to the building interior. Outside air is supplied to the other side of the membrane, or a vacuum is applied.

The invention relates to the technical field of gas detection, in particular to a gas detection device and a detection method. Comprising a sample injection cavity provided with a selective permeable membrane which divides the sample injection cavity into a membrane inner cavity and a sample cavity; the sample inlet pipe is respectively communicated with the membrane inner cavity and the sample cavity, and the sample outlet pipe is communicated with the sample cavity; and the air outlet pipe is communicated with the membrane inner cavity, and a valve is arranged on the air outlet pipe. In the application, the sample injection cavity with the selective permeable membrane is arranged, the cavity is divided into the membrane inner cavity and the sample cavity, and the sample injection pipe, the sample outlet pipe, the gas outlet pipe, the circulating gas circuit and the controller are matched, so that the structural integration of membrane sample injection and membrane-free sample injection functions can be realized. The device can be in a membrane mode when the valve is closed, and can be in a membrane-free mode when the valve is opened. The air filtering equipment can filter the detected gas in the circulating gas path, so that the influence of the circulating gas on the detection result is prevented.