33results about How to "Solve the problem of low separation efficiency" patented technology

The invention relates to the preparation of a photoelectric catalytic membrane for preparing hydrogen by decomposing water. The preparation method comprises the steps of mixing sodium cellulose acetate or sodium carboxymethyl cellulose with polyvinylpyrrolidone; heating by distilled water, and stirring for dissolving; spreading the product on a flat glass plate, and drying to form a membrane; crosslinking by heavy metal ions; soaking in solution containing anion groups, and drying at the room temperature to obtain a thin membrane; evenly dispersing oxyhalide bismuth catalyst in absolute ethyl alcohol under ultrasonic oscillation, pouring the mixed solution onto the surface of the thin membrane, and drying by air; mixing chitosan and polyvinylpyrrolidone, and dispersing the mixture; heating by acetic acid water solution, and stirring for dissolving; feeding an aldehyde crosslinking agent for crosslinking, and then pouring the product onto the oxyhalide bismuth thin membrane to obtain the photoelectric catalytic membrane. The photoelectric catalytic membrane is used for preparing the hydrogen by decomposing water, and is capable of effectively separating photoproduction electron holes; the hydrogen production quantum efficiency reaches up to 90-96%, the hydrogen purity reaches up to 99-99.9%, and 15-40% of energy consumption can be saved, so that a new way is provided for preparing hydrogen by decomposing water through photoelectrocatalysis.

The invention discloses a preparation method of a high-flux polyimide composite ultrafiltration membrane. The method comprises the following steps: step (1), dissolving two types of aromatic diamine into a solvent, then adding aromatic dianhydride, and stirring to perform reaction, so as to obtain a polyamic acid solution; step (2), adding a catalyst and a dehydrating agent into the polyamic acidsolution obtained in the step (1), stirring to perform a reaction, cooling the solution to room temperature, dropwise adding methanol till the color of the solution completely becomes white from red,and performing suction filtration, so as to obtain solid powder, repeatedly washing through methanol and performing suction filtration, and drying, so as to obtain polyimide solid powder; step (3), dissolving the polyimide solid powder obtained in the step (2) into a solvent, stirring and dissolving, coating the powder onto a supporting layer, and then forming the polyimide composite ultrafiltration membrane. The obtained high-flux polyimide composite ultrafiltration membrane is high in pure water flux, and the retention rate of bovine serum albumin BSA can reach 99.5 percent or higher. The method can solve the problem that in the prior art, the separation efficiency of a polyimide ultrafiltration membrane is low.

An application of a bipolar film surface powder state photocatalyst in water splitting, the application is based on a cation exchange membrane with a surface-loaded P-type semiconductor photocatalyst powder and an anion-exchange membrane with a surface-loaded N-type semiconductor photocatalyst powder as bipolar film, and constitute the cathode chamber and the anode chamber diaphragm, the P-type semiconductor photocatalyst powder material is used as the cathode, and the N-type semiconductor photocatalyst powder material is used as the anode. A xenon lamp was used as the light source, and the photocatalytic water splitting hydrogen production was continuously carried out under the action of an applied voltage of 0.5-2.0 V. In the present invention, the catalyst in powder state is attached to both sides of the bipolar membrane for photoelectric catalytic water splitting to produce hydrogen. The voltage and hydrogen production efficiency remain basically unchanged, realizing the efficient and continuous operation of semiconductor powder state photocatalyst to decompose water to produce hydrogen.

The invention relates to a method for refining magnesite, and belongs to the technical field of magnesite mineral processing. The method comprises the steps: firstly removing talc silicate minerals through reverse flotation; then removing most of calcium-containing carbonate gangue through reverse flotation; performing direct flotation to remove silicate minerals and calcium-containing carbonate minerals; and finally, obtaining magnesite concentrate through concentration. According to the method, a reverse-reverse-forward flotation method is adopted, and reagents in the flotation process are combined so that the floatability difference between the magnesite and gangue minerals is increased, and the problem of separation of calcium and magnesium in the magnesite refining process is solved.The low-carbon organic acid and the inorganic strong acid are combined, the sorting property of magnesium and calcium is effectively improved through directional complexing of organic acid radical ions, and mineral purification is achieved through the anion collecting agent. The method has the advantages that magnesite raw ore with poor quality can be used for obtaining high-quality concentrate products, the boundary grade of the selected raw ore is increased, and comprehensive utilization of mineral resources is facilitated.

The invention discloses a method and equipment for synthesizing methyl isobutyl ketone by a two-step method from acetone. The method comprises: a. the raw material acetone is condensed and dehydrated in a catalytic rectification tower to generate DAA and MSO, and is fed to the side line of the catalytic rectification tower Extract products rich in MSO and water; b. The DAA-containing material is extracted from the side line of the catalytic rectification tower and enters the DAA decomposition reactor. The DAA in the material is converted into acetone and MSO, and the product is flash separated to obtain acetone-rich gas phase and The liquid phase containing MSO and water is recycled back to the tower respectively; c, the liquid phase product described in step a is cooled and phase-separated to obtain an organic phase rich in MSO and an aqueous phase containing a small amount of organic matter, and the aqueous phase enters the recovery tower to recover organic matter; d 1. The organic phase described in step c is hydrogenated to generate MIBK, and the hydrogen gas is recovered by flash evaporation and then enters the MIBK refining tower, and the MIBK product is extracted from the side line. The whole process conversion rate of acetone in the invention reaches 99.0%, and the purity of the product MIBK can reach 99.5%.

The invention discloses a method for separating and culturing rabbit fat stem cells. It includes the following steps: (1) aseptically obtain rabbit adipose tissue; (2) prepare a small piece of fat tissue; (3) digest the adipose tissue with trypsin, and separate the upper layer solution and the lower layer precipitate; (4) the upper layer solution Digest by time gradient method; (5) collect adipose stem cells, mix with adipose stem cell culture medium, inoculate and culture; (6) in vitro culture of adipose stem cells; (7) detect and freeze. In the cell separation method, the tissue digestion is not complete enough, and the cell separation efficiency is low. The separation method of adipose stem cells is optimized, which makes the adipose tissue digestion more thorough, improves the cell separation efficiency, and thus provides a better source of adipose stem cells.

The invention relates to a tire bead wire separating device, and belongs to the technical field of solid waste treatment. The tire bead wire separating device comprises a machine frame, wherein a motor, a fixing tube and a clamping device are installed on the machine frame from top to bottom, the motor is connected with a telescopic rod, and the telescopic rod is provided with a first telescopic section, a second telescopic section and cutters from top to bottom; the cutters are hinged to the telescopic rod, springs are connected between the cutters and the telescopic rod, and a push rod is connected to the side wall of the telescopic rod; a support rod is arranged in the fixing tube, the support rod is connected with a rack in a sliding mode, two gears are rotationally connected to the support rod, the gears are meshed with the rack, and the gears are coaxially connected with supporting bars; and a pulling device is arranged below the clamping device, the pulling device comprises an air cylinder, a working table is connected to the air cylinder, and electromagnets are connected to the working table. According to the technical scheme, a waste tire does not have relatively large deformation in the pulling process, furthermore, the whole pulling process is mechanical, the separating efficiency is high, the effect is good, and the practicability is high.

The invention discloses a method for purifying high-purity hydrogen or high-purity chlorosilane with phosphorus-containing impurities, comprising the following steps: heating the high-purity hydrogen with phosphorus-containing impurities to 500-800°C, and reacting the phosphorus-containing impurities in the high-purity hydrogen with hydrogen Generate phosphine, and then adsorb the phosphine through molecular sieves to obtain purified high-purity hydrogen. The phosphorus-containing impurities in the high-purity hydrogen containing phosphorus impurities are converted into phosphine by heating, so that all kinds of phosphorus-containing impurities are reduced and reacted to form the same substance phosphine, because the molecular sieve has a large impact on the gas passing through it. Selective adsorption of phosphine, thereby improving the adsorption capacity of phosphine in high-purity hydrogen with phosphorus impurities, thus greatly improving the purity of purified high-purity hydrogen, and further improving the production of purified high-purity hydrogen as raw materials The quality of the polysilicon reduces the impurity content in the polysilicon.

The invention discloses a loosening device of a separating screen. The loosening device comprises a supporting frame, wherein a driving shaft and a driven shaft are arranged on the supporting frame, rails are arranged on the supporting frame, the rails comprise a fixed first rail and a movable second rail, a first driving mechanism is arranged on the supporting frame, the first driving mechanism is connected with the driving shaft and the driven shaft, a plurality of rake tooth assemblies are arranged on the first driving mechanism in a sleeving mode, the first driving mechanism can drive the rake tooth assemblies to move in a plane parallel to the first rail, and the second rail is hinged to an oscillating mechanism which can enable the second rail to oscillate horizontally. The loosening device of the separating screen provided by the application has the advantages of simple structure, stable operation, good separating effect and small mechanism vibration and also has a good separating effect on separating and loosening straw with larger humidity.

A bipolar film surface powder state photocatalyst in the application of CO2 reduction is to use the surface-loaded powder state photocatalytic bipolar film as the diaphragm of the cathode chamber and the anode chamber, and the surface of the cation exchange membrane of the bipolar film is loaded with P-type Semiconductor photocatalyst powder; the surface of the anion exchange membrane of the bipolar membrane is loaded with N-type semiconductor photocatalyst powder, the P-type semiconductor photocatalyst powder is used as a cathode, the N-type semiconductor photocatalyst powder is used as an anode, a xenon lamp is used as a light source, and an external voltage is applied Under the action, the photoelectric catalytic CO2 reduction is carried out, and the water oxidation reaction is carried out in the anode chamber. The water dissociation in the middle interface layer of the bipolar membrane not only provides continuous H+ for CO2 reduction, but also does not cause hydrogen evolution reaction due to high H+ concentration. At the same time, the ionic liquid improves the solubility of CO2 and the transfer rate of protons, improving the efficiency of CO2 reduction. .

The invention provides a strong turbulent shearing microchannel oil-water separation device, which comprises an oily wastewater storage tank (1), an oil-water delivery pump (2), an oil-water delivery pipe (3), and a pneumatic liquid booster pump ( 4), connecting pipe (5), microchannel (7), liquid collecting pipe (8) and oil-water separation box (9); a pressure gauge (6) is provided on the connecting pipe (5), and on the oil-water separation box ( 9) The oil phase liquid outlet (10) and the water phase liquid outlet (11) are respectively provided on the top, the oil phase switch valve (12) is installed at the front end of the oil phase liquid outlet (10), and the water phase liquid outlet (11) The front end is equipped with a water phase switch valve (13); the device of the present invention has the advantages of small equipment investment, high oil-water separation efficiency, continuous operation of the purification process of oily sewage, etc., and can be widely used in various Efficient purification treatment of oily and dusty wastewater.

The invention discloses a bismuth tungstate / bismuth phosphate composite thin film, a preparation method and an application thereof. The preparation method includes the steps of: layerwise spin-coating a substrate with Bi2WO6 sol and performing annealing, and when the thickness of the Bi2WO6 thin film reaches a certain value, layerwise spin-coating the Bi2WO6 thin film with BiPO4 sol and performing annealing at certain temperature to prepare the Bi2WO6 / BiPO4 composite thin film. The method employs a sol-gel process, is simple in demand on equipment and has mild experiment conditions. The prepared sol can remain stable for a long time, wherein concentration of the sol is accurately controllable. The Bi2WO6 / BiPO4 composite thin film, under simulated sunlight, can generate photo-response current being 1.423-2.649 mA / cm<2>, which is higher than that of Bi2WO6 thin film and BiPO4 thin film by 2-3 times. The Bi2WO6 / BiPO4 composite thin film has a wide application prospect in the field of photocatalysis.

The invention relates to the technical field of agriculture, and in particular provides a combined type soil animal separator, which can separate various soil animals effectively. The structure of the combined type soil animal separator comprises a separating rack of which the top is provided with a top cover system; the separating rack is provided with a hopper position perforated plate; a hopper is arranged on the hopper position perforated plate; a material bin of the separator is arranged above the hopper; and a soil animal collector is arranged below the hopper. Compared with the prior art, the combined type soil animal separator has the characteristics of rational design, simple structure, high separation efficiency, strong comparability, adjustment and selectivity, capability of controlling temperature and time automatically, capability of being applied to a plurality of sample sizes and the like.