50results about How to "Large filtration flux" patented technology

The invention relates to the technical field of porous ceramic materials and film separation, in particular to a low-temperature sintering acid and alkali resistant porous silicon carbide ceramic filmand a preparation method thereof. The method sequentially comprises the following steps of (1) support body manufacturing; (2) transition layer processing; (3) filtering layer processing; (4) film sintering process. The method provided by the invention has the characteristics that the sintering temperature is low; the production energy consumption is low; the process method is simple; the equipment requirements are low; the production cost and the investment cost are low; the control is flexible; the shaping is easy; the method is suitable for industrial customization and meets the scaled production. The porous silicon carbide ceramic film produced by the method has the characteristics of good hydrophilcity, great filtering flux, high porosity, high filtering precision, high mechanical intensity, good acid and alkali resistant performance and long service life.

The invention relates to a preparation method of a porous ceramic pipe with a gradient through hole structure. The preparation method is characterized in that the adopted raw materials include freezing medium tertiary butanol, ceramic powder, a dispersing agent, adhesive, a lubricating agent, and refrigerant; and the preparation method comprises the steps of mixing the raw materials based on a certain ratio; freezing and shaping; and sintering at a low temperature of -50 DEG C under an air condition without pressure, thus obtaining the porous ceramic pipe with the gradient through hole structure. The porous ceramic pipe prepared by the method provided by the invention has a radial gradient through hole structure with an axis served as the centre of a circle; and the porous ceramic pipe has the advantages of high strength, high filtration flux, and being easily cleaned. The preparation method is simple in preparation technology, has low requirements on equipment and technological conditions, and is beneficial for being popularized and used.

The invention discloses a preparation method of a ceramic filtering membrane supporting body. The method comprises the steps of (1) preparing a raw material, wherein the raw material comprises mixing powder, namely alpha aluminium oxide powder (1) the purity of which is greater than or equal to 99.7% and alpha aluminium oxide powder (2) the purity of which is greater than or equal to 99.8%, the median particle diameter D50 of the alpha aluminium oxide powder (1) is 18-35mum, the median particle diameter D50 of the alpha aluminium oxide powder (2) is 0.8-2mum, and the dosage of the alpha aluminium oxide powder (2) is 2%-10% (weight) of that of the alpha aluminium oxide powder (1); (2), mixing the mixing powder with a water solution of cross-linking agent acrylamide and methylene double crylic acid ammonium to form a suspension, and carrying out gel casting on the suspension; heating a formed product to 40-55 DEG C in a microwave manner, drying for 1-3 hours, calcining the dried formed product for 4-8 hours under 500-800 DEG C in air atmosphere, placing a calcined product in vacuum or atmospheric hydrogen or argon atmosphere, carrying out heat preservation on the calcined product for 4-12 hours under the condition of 1800 DEG C-1950 DEG C so as to form a supporting body of a pure alpha phase aluminum oxide ceramic filtering membrane. The preparation method provided by the invention has the advantages that the porosity of a product is high, the flux is high, and the product is strong-acid-resisting and strong-alkali-corrosion-resisting.

The present invention relates to membrane separating process of purifying high temperature condensated water. High temperature condensated water is first microfiltered or ultrafiltered and then deeply treated with nanofiltering film to have the suspended matter, oil, colloid, dissolved small molecular weight organic matter, inorganic ion and other impurities. The process has stable treating effect and capacity of recovering the heat energy in high temperature condensated water, and the treated water may be reused in boiler. The present invention provides one stable and effective way for treating and reusing high temperature condensated water.

The invention provides a preparation method of a multilayered gradient ceramic membrane. According to the method, ceramic membrane slurry having different chemical components and grain sizes is printed on a flat plate type ceramic membrane supporting body by adopting a silk-screen printing technology and is commonly sintered with the flat plate type ceramic membrane supporting body once, so that the multilayered gradient ceramic membrane having different chemical components and pore structures is formed on the surface of the supporting body. With the adoption of the silk-screen printing technology, the thickness of a single-layer membrane can be controlled in a range of 10-30 microns, and the thickness is uniform and consistent; and the technical difficulties that a dip-coating-method membrane layer is relatively thick and the thickness of a spraying-method membrane layer is not uniform are effectively overcome. The multilayered gradient ceramic membrane is composed of more than three layers of membrane materials having the different chemical components and grains, so that the multilayered gradient ceramic membrane has different coefficients of thermal expansion, porosities and average pore diameters; thermal stress, caused by unmatched expansion coefficients, between the supporting body and the membrane layer is alleviated well; and the binding strength of the membrane layer and the supporting body is improved, and the filtration flux of the membrane layer is increased. The multilayered gradient ceramic membrane is long in service life and low in preparation cost, saves energy and is environmentally friendly.

The invention belongs to the field of biochemical engineering and specifically relates to a method for separating and purifying L-hydroxyproline from L-hydroxyproline fermentation liquor. The method comprises the following steps: separating bacterial solution of the fermentation liquor, filtering with an ultrafiltration membrane, treating with a compound absorbent, desalting and performing vacuum concentration crystallization. According to the method provided by the invention, the fermentation liquor is pretreated and then is filtered for removing bacteria, so that the filtration flux is increased, the filtering time is shortened and the removal rate of protein is 20% or above; no cation exchange resin is used and the acid-alkali wastewater is greatly reduced; the nanofiltration membrane or reverse osmosis membrane treatment is not required, the qualified product is acquired through primary crystallization, the power cost and energy consumption are greatly reduced and an efficient low-cost method for separating and purifying hydroxyproline is formed; according to the invention, the production process route is simplified, the production period is shortened, the production cost is lowered, the extraction rate of the L-hydroxyproline is increased to 85% or above and the content of the end product is 99.0% or above.

The invention provides an underground movable modular mine water treatment system which comprises the following steps: firstly, introducing mine water into a shaft sump for sedimentation treatment; carrying out solid-liquid separation treatment on the settled mine water to remove fine suspended solids therein; carrying out oil water separation treatment on first coarse purified water to remove dissolved oil and emulsified oil to obtain second coarse purified water; and carrying out ultrafiltration treatment on the second coarse purified water to remove organic matters therein so as to obtain purified water. The invention provides a device for treating mine water underground. The device comprises the shaft sump, a solid-liquid separation device, an oil water separation device, an ultrafiltration device and a control device. The system provided by the invention has an obvious effect for removing organic matters in mine waste water. The pollutant concentrations of the mine waste water treated by the system are obviously reduced, and the removal rate is relatively high. The device provided by the invention can be directly arranged in the coal mine and the mine water treated is directly reused in the pit, so that the investment and operating cost of waste water treatment are hugely saved.

The invention discloses a preparation method of an asymmetric plate ceramic nanofiltration membrane. According to the method, ceramic powder with different chemical composition and granular sizes is mixed with a water-based auxiliary, ceramic membrane slurry is prepared and printed on a plate ceramic membrane support body by a special porous emulsion roller, the support body is sintered at different temperatures, and the asymmetric plate ceramic nanofiltration membrane with different chemical composition and pore structures is formed on the surface of the support body. Density, diameter and depth of slurry adsorbing holes in the porous emulsion roller can be adjusted effectively with a laser drilling technology, so that thickness and uniformity of the ceramic membrane can be controlled precisely. The ceramic membrane with different thicknesses and surface pore size being 5-100 nm can be obtained with adoption of the porous emulsion roller with different pore density, pore diameter andpore depth. The asymmetric plate ceramic nanofiltration membrane is low in filtering resistance, high in filtering reflux, long in service life, energy-saving and environmentally friendly, and preparation cost is low.

The invention discloses a filter element, in particular to an oil mist purification filter element which comprises a gas-liquid filter screen and an outer frame for fixing and unfolding a laminated gas-liquid filter screen which is folded, wherein the gas-liquid filter screen is formed by weaving a steel wire with the diameter of 0.2 layer-05mm and a PP (polypropylene) fiber with the diameter of 1.0 layer-2.0mm or a glass fiber, the steel wire and the PP fiber or the glass fiber are wound, meshes of two specifications are distributed on the gas-liquid filter screen at intervals, the first mesh takes on a rectangle with the length L3 of 4.5mm-6mm and the width W1 of 4mm-5.5mm, and the second mesh takes on a rectangle with the length L3 of 6mm-6.5mm and the width W3 of 4mm-5.5mm. According to the filter element, the technical defect that the existing gas-liquid filter screen is poor in filter quality or low in filter efficiency is overcome, the filter element is mainly applied to an oil mist filter system, and has the advantages that the filtration flux is large and the accuracy is high, and the like.

A method for producing a composite filter tube and filter element made of a multilayer metal mesh and metal powders, including: knitting to obtain metal meshes of different mesh numbers, obtaining a layered structure by means of a lamination method, then putting the layered structure in a vacuum furnace for sintering processing, sintering a metal composite layer to obtain a composite filter sheet and tube made of a multilayer metal mesh and metal powders with a multilayer metal mesh as a structure support layer and a metal powder sinter structure as a filter layer, then rolling the composite filter sheet and tube into a tubular filter element by using a shaping machine, and welding to obtain a composite filter tube and filter element product made of a multilayer metal mesh and metal powders.

The invention provides a method for treating caprolactam production wastewater. The method comprises the following steps of (1) salting-out: adding inorganic salt into a reactor, while continuously leading the caprolactam production wastewater and/or reflux liquid, continuously evaporating moisture, and precipitating organic matters in the wastewater in a floccule form under the salting-out function; (2) flocculating: continuously leading the wastewater containing the floccule into an overflow tank, adding a flocculant into the overflow tank, flocculating and settling suspensions containing the floccule in the wastewater, and enabling the supernatant of the overflow tank to flow back to the reactor; (3) thinning the wastewater subjected to salting-out and flocculating, sending into a membrane biological reactor, and further performing biochemical treatment, wherein the membrane biological reactor comprises an A/O biochemical system, a dynamic membrane filter, a dynamic membrane preparation system and a hydraulic backflushing device. The method has the advantages that the energy consumption is low, the operation cost is low, and a large amount of caprolactam wastewater can be effectively and quickly treated.

The invention relates to a preparation method of an ultra-high molecular weight polyethylene composite microporous membrane. The preparation method comprises the following steps: (1) carrying out desizing treatment on base cloth which is high-temperature-resistant cloth, then drying, and performing pretreatment with pretreating agents; (2) weighing ultra-high molecular weight polyethylene, diluents and antioxidants in parts by weight, melting and mixing by a double-screw extruder, performing hot-pressing combination on the mixture and the base cloth to obtain a composite jelly membrane by a continuous extrusion process or a gap type mold-pressing process; and (3) removing the diluents in the composite jelly membrane by extraction agents, drying and shaping to obtain the composite microporous membrane. According to the preparation method, the ultra-high molecular weight polyethylene enters the inside of the cloth sufficiently to form a penetrating network, the combined membrane has good penetrating property, high water flux and high mechanical property improved greatly, and the prepared microporous membrane can be used for production of foods, medicines, and ultrapure water, and can meet the requirements of separation, purification, concentration and purification.

The invention relates to a preparation method of a ceramic membrane, in particular to a preparation method of a large-flux ceramic membrane. The preparation method comprises the following steps: (1) preparing a support body, namely mixing aluminum oxide powder, titanium oxide powder, zirconium oxide powder and auxiliary materials according to a certain ratio, mixing, kneading, forming and drying the mixture, and finally sintering the mixture at high temperature to form the support body, wherein the flow channels in the support body are arranged in a manner of combining regular hexagonal flow channels and long hexagonal flow channels; 2) preparing a transition layer, namely mixing zirconium oxide powder, titanium oxide powder, aluminum oxide powder and auxiliary materials, and stirring, coating, drying and sintering the mixture at high temperature to form the transition layer; and 3) preparation of a filter membrane layer: mixing zirconium oxide powder, aluminum oxide powder and auxiliary materials, and performing stirring, coating, drying and high-temperature sintering to obtain the filter membrane layer with the filter precision of 20-200 nanometers. The ceramic membrane preparedby the method has the characteristics of high flux, high bending strength, strong pollution resistance and acid and alkali corrosion resistance.

The invention relates to a high-flux virus-removing polyvinylidene fluoride hollow fiber microporous membrane with a multi-layer filtering structure and a preparation method thereof. In order to improve the virus interception performance and the pure water flux of the hollow fiber microporous membrane, the polyvinylidene fluoride hollow fiber microporous membrane disclosed by the invention has theadvantages that the outer diameter of membrane filaments is 1.1-1.4 mm, the inner diameter is 0.6-0.8 mm, and the wall thickness is 0.2-0.4 mm, obvious holes are formed in the outer surfaces of the membrane filaments, and a three-layer film pore structure layer with a remarkable boundary is formed from outside to inside. The preparation method comprises the following steps: preparing a membrane casting solution, extruding a hollow fiber membrane, spraying a solvent on the outer layer and exchanging to form a film, performing low-temperature split-phase film forming on the middle layer, carrying out inner-layer low-temperature split-phase film formation and carrying out extraction. The method is based on a thermally induced phase separation membrane preparation method, technologies such asshallow solvent-non-solvent rapid exchange film formation and graded temperature gradient split-phase pore formation are combined, the hollow fiber membrane with the three-layer pore structure, whichhas obvious different boundaries, is prepared by using the method disclosed by the invention, on the premise of ensuring large filtration flux, efficient multi-layer filtration can be formed on pathogenic microorganisms such as viruses, the interception performance reaches 99.99%, and the average interception rate detected by a third party reaches 99.999%.

The invention provides a polyvinylidene fluoride hollow fiber membrane and a preparation method thereof. The hollow fiber membrane is a porous structure prepared by taking polyvinylidene fluoride (PVDF) as a raw material under the action of a diluent. The outer surface layer of the porous structure is of a pit structure, and the pit structure comprises a plurality of pits; the diameter of each pit is 0.1 [mu]m-1 [mu]m, a large number of small holes formed by piling PVDF spherocrystals are uniformly distributed in the pits, and the aperture of the small holes is 0.02 [mu]m-0. 04 [mu]m; a spongy macroporous structure with non-uniform pore diameter is arranged below the outer surface layer, the pore diameter of the spongy macroporous structure is gradually changed from the outer surface layer to the inside, and a change value is gradually increased from 1 micron to 10 microns. According to the PVDF hollow fiber membrane with the hourglass-like pore structure, provided by the invention, the effective filtering surface area of the hollow fiber membrane is obviously increased, so the hollow fiber membrane is large in filtering flux and has a good interception effect; namely, the unification of large flux and high interception of the PVDF hollow fiber membrane is realized.

The invention relates to a liquid filter membrane component. The liquid filter membrane component comprises a filter membrane formed by a flexible porous metal membrane, wherein the filter membrane is connected with a frame provided with a liquid discharging pipe and forms a filter structure which has the characteristics that the peripheral surface and the end surface opposite to the liquid discharging pipe are closed except the end surface on which the liquid discharging pipe is positioned, and the filter structure is internally provided with a support flow guide structure which faces to an opening of the liquid discharging pipe along the surface of the filter membrane. The liquid filter membrane component has the advantages of simple structure, small pressure loss in the filter process, flow guiding effect, low liquid flow resistance, good filter effect, repeated cleaning, corrosion resistance, and high temperature (400 DEG C) resistance.

The invention relates to a method for preparing a ZIF-8 composite film through electro-deposition and an application of the ZIF-8 composite film, and relates to the method for preparing the ZIF-8 composite film through electro-deposition and the application of the ZIF-8 composite film. The invention aims to solve the problems that the thickness is not uniform and the defect is difficult to control in an existing preparation method. The membrane is composed of a substrate membrane and a ZIF-8 separation layer; and the separation layer is a compact ZIF-8 crystal separation layer with uniform thickness, membrane holes are small and uniform, the membrane layer is uniform and thin in thickness, and the separation capacity for small molecular pollutants in water is high. The method comprises the steps: after a noble metal is sputtered on a substrate film for electric conduction, immersing the substrate film and graphite paper respectively serving as a working electrode and a counter electrode into an electrolytic tank containing a precursor solution, taking the substrate film as a cathode, and synthesizing through a one-step electrodeposition method at normal temperature and normal pressure. The prepared composite membrane shows excellent interception performance on small dye molecules, and the flux is larger than that of an MOFs composite membrane prepared through a traditional method. The ZIF-8 composite film is used for intercepting dye wastewater.

The invention relates to a production method for an asymmetric structure powder sintering metal filter pipe and filter element with a strengthening phase. A molding agent is added to metal powder to be mixed, a casting machine is used for obtaining a powder pipe and a sheet forming blank, ungrease treatment is conducted, and then a metal net and mesh wires are laid on the powder pipe and the sheet forming blank and placed in a vacuum furnace for sintering, so that the powder pipe with the strengthening phase and high porosity, a sheet supporting layer and a composite supporting layer are obtained; a coating is sprayed to obtain an asymmetric structure powder sintering filter material with the strengthening phase which is molded and rolled to be of a tube shape for welding, and therefore the asymmetric structure powder sintering metal filter pipe and filter element with the strengthening phase is manufactured. The asymmetric structure powder sintering metal filter pipe and filter element with the strengthening phase has the advantages of being low in filtration resistance, high in filtration flux and porosity and strong in pressure bearing capacity, is applied to S-Zorb devices of Sinopec, increases the filtration flow by 30-50%, and enables the total yield to be more than doubled substantially.

The invention relates to a ceramic membrane water filtering device and a pretreatment method. The ceramic membrane water filtering device comprises a flocculation reaction tank, a first booster pump, a ceramic membrane filter and a ceramic membrane water producing tank which are sequentially communicated from a water inlet pipeline to a water outlet pipeline, an inlet of the flocculation reaction tank is connected with a flocculant adding device; a water inlet at the bottom of the ceramic membrane filter is connected with a fan and a cleaning water tank; a chemical cleaning agent adding device and a cleaning pump are connected between the water inlet and the cleaning water tank; a backwashing pump is connected between a water producing port at the upper part of the ceramic membrane filter and the ceramic membrane water producing pool; a concentrated water opening in the top of the ceramic membrane filter is connected with an inclined tube sedimentation tank. According to the invention, seawater, surface water, reclaimed water and the like are filtered by using the ceramic membrane, so that the occupied area is reduced by more than 70%, the operating cost is reduced by more than 50%, the service life of the membrane is prolonged from 3-5 years to more than 20 years, the maintenance work caused by filament breakage of the hollow fiber membrane is reduced, and the environmental pollution caused by plastic wastes generated after the service life of the organic membrane is ended is avoided.