923 results about "Membrane technology" patented technology

The invention provides a treatment system and treatment method for biochemical effluent of industrial wastewater. The treatment system comprises a flocculation sedimentation unit, a filtration unit, an advanced oxidation unit, an ultrafiltration unit, a reverse osmosis unit, a nanofiltration unit, an electrodialysis unit and an evaporation unit which are sequentially connected; and the water production outlet of the ultrafiltration unit is connected with the water inlet tank of the reverse osmosis unit, and the concentrated-water outlet of the reverse osmosis unit is connected with the water inlet of the nanofiltration unit. According to the invention, the treatment system and the treatment method utilize the coupling and synergistic effects of a physical-chemical method and a membrane technology to overcome the limitation of using a single technology, and the advanced treatment and desalination reuse of the industrial wastewater are realized; and the treatment system and the treatmentmethod have the advantages of strong adaptability to raw water, a high recovery rate of fresh water, a high concentration multiple of concentrated water, low energy consumption of evaporation and crystallization and the like, greatly improve the reuse rate of the industrial wastewater, reduce the amount of wastewater discharging, can be applied to the deep treatment and desalination reuse of various effluent wastewater, and promote the promotion and application of the technology in related industries.

The invention discloses a chemical production method, in particular a novel green production process for propylene oxide. In the method, the process design is carried out by using bipolar membrane, electrodialysis, antiosmosis, air flotation, heat exchange, oxidation, and other technology. In the production process, sodium hydroxide replaces the conventional calcium hydroxide and generates sodium chloride through reaction; the sodium chloride generates hydrochloric acid and sodium hydroxide by the bipolar membrane technology; and the hydrochloric acid is recovered, and the sodium hydroxide and water can be recycled. Therefore, no new sodium hydroxide is needed and no wastewater is discharged in the production of the propylene oxide. The sodium hydroxide is added at the preliminary stage of the production of the propylene oxide, and the input amount of the sodium hydroxide is controlled between 5 and 15 percent. The novel green production process for the propylene oxide has the advantages that: the recycling of the water, sodium chloride and sodium hydroxide is realized, the effects of zero discharge and input reduction of production materials are substantially achieved, and finally better social and economic benefits are achieved. The novel green production process for the propylene oxide can be widely applied to the chlorohydrin production in China.

The invention discloses a method for extracting glyphosate from heavy glyphosate stock solution by membrane separation technique. It consists of filtering the mother liquid, removing the solid component of the system, then according to the molecular structure, molecular mass, particle size and electric charge, from the big one to the small one, separating step by step by selecting appropriate hyperfiltration membrane, nanofiltration membrane and reverse osmosis membrane to obtain the effective composition of glyphosate. The invention unitizes the separation, concentration and the purification, and is performed at normal temperature. The barrier separation process is excellent in that it is of no change of phase, avoids the decomposition of glyphosate caused by high enrichment and concentration, effectively improves the product quality and yield rate, greatly reduces the energy consumption, is of consecutive operation, low operation cost, and it is energy-saving, highly effective, environment-friendly, furthermore, it can be operated by combining with routine thickening operating unit or be operated individually and is suitable for industrial continuous production.

The invention discloses a mint-releasing cigarette filter tip and a production technique thereof, relating to a cigarette filter tip and the production technique thereof. The mint-releasing cigarette filter tip contains tow material in which cotton thread infused with mint essence solution is wrapped; film-forming material solution is adsorbed at the outer layer of the cotton thread infused with mint essence solution; mint essence is added in the film-forming material solution; and the film-forming material includes natural macromolecular material and synthetic macromolecular material. The mint-releasing cigarette filter tip has the advantages that: 1, adopting membrane technology, mint is low in volatility at room temperature, so the mint can be effectively released when taking the cigarette;2, the production technique is simple; 3, the mint-releasing cigarette filter tip is not changed in performance; 4, the mint-releasing cigarette filter tip can be preserved for more than one year at room temperature; 5, the mint-releasing cigarette filter tip is low in cost.

The invention provides a preparation technology of xylose, which mainly comprises the following technical steps: hydrolyzation, ultrafiltration purification, primary decoloring, electrodialytic deacidification and desalination, membrane concentration, primary evaporation and concentration, secondary decoloring, ion exchange refined desalting, secondary evaporation and concentration, crystallization, centrifugation, and drying to obtain a finished product xylose crystal. The technology has the advantages that the membrane technology is used to remove macromolecule impurities of colloid, protein, and the like in xylose hydrolysate, electrodialytic deacidification and desalination technology is used to lower the electric conductivity of an xylose solution, and meanwhile, neutralization and positive-negative-positive resin combined one-step purification process is removed to simplify the technical process; therefore, the manufacturing cost of xylose is lowered, meanwhile, the waste water discharge load of the manufacturing of xylose can be allowed to be lowered by more than 40%, and well environmental benefits and economic benefits are achieved.

The invention belongs to the field of membrane technology, and particularly relates to a carbon nano tube-polymer composite nanofiltration membrane and a preparation method thereof. The composite nanofiltration membrane is obtained by forming a layer of aromatic polymer functional cortex loaded with carbon nano tubes on a porous support membrane through the method of the invention. By using the method of the invention, the carbon nano tubes can be effectively loaded in the polymer functional cortex of a composite membrane, and the permeability and the selectivity of the prepared carbon nano tube-polymer composite nanofiltration membrane are superior to those of the membrane prepared by a traditional interfacial polymerization technology. The composite nanofiltration membrane surface functional cortex contains a great amount of carboxyl groups, and has higher permeability and desalinization ratio under a lower operation pressure. The preparation method of the invention has the advantages of simple operation process, mild reaction conditions, lower production cost and good application prospect of industrial production.

A related desulphurization waste-water zero discharge processing system comprises a neutralization adjusting basin, a coagulation sedimentation basin and a flocculation sedimentation basin which are in successive connection. In the flocculation sedimentation basin, a supernatant formed in a specially-produced metering water channel flows into a supernatant processing device, and the lower dense liquid flows into a lower-dense-liquid processing device. The supernatant processing device comprises a full-automatic softening filter, an ultrafilter, a first-grade RO (reverse osmosis) device and a second-grade RO device; the outlet of the second-grade RO device is connected with a dense liquid tank and a pure water tank, pure water in the pure water tank is reusable, and a dense liquid in the dense liquid tank enters a crystallization evaporator for generating a salt. The lower-dense-liquid processing device discharges solid waste. Wastewater separated from a sewage concentration tank is discharged into the neutralization adjusting basin via a pipe for cyclic once-more processing. The technical scheme is combined with an advanced membrane technology, the technological flow is simple, energy-saving and environment-friendly, environment protection benefit is obviously increased, a new zero-discharge technology is realized, and the technical scheme possesses significant meaning on water pollution treatment.

The invention discloses a method for continuously extracting and preparing concentrated protein, separated protein and proteolysis products from almond meal. The method comprises the following steps of: degreasing and debitterizing residual oil meal obtained after almond oil is mechanically and coldly pressed, and then extracting with a low-concentration NaCl phosphate buffer solution to obtain the concentrated protein; preparing almond separated protein from the concentrated protein solution by applying an ultrafiltration membrane technology; preparing a proteolysis-almond polypeptide mixed solution from the separated protein solution by applying an enzymolysis technology; and ultrafiltering the polypeptide mixed solution by applying a membrane technology to obtain multifunctional active almond peptide with different class level molecular weights in sequence. The method has the advantages of simple process, strong operability and easiness in control of extracting conditions and can finish the extraction and preparation of the almond concentrated protein, the separated protein and the proteolysis products in sequence; and the obtained products have high purity and wide application and can be directly used as food additives, nutrition reinforcers, health care products, medicaments, and the like needed by the protein foods and different processing foods.

The invention belongs to the field of ultrafilter membrane technology, and specifically relates to a high strength nanometer modified ultrafilter membrane and a preparation method thereof. The high strength nanometer modified ultrafilter membrane comprises following ingredients, by weight, 40 to 60 portions of polyvinylidene fluoride, 2 to 8 portions of polyvinylpyrrolidone, 5 to 10 portions of polyvinyl alcohol, 5 to 20 portions of polyethylene glycol and 0.05 to 0.5 portion of carbon nanotube. The high strength nanometer modified ultrafilter membrane is prepared by flat plate casting or electrospinning. The high strength nanometer modified ultrafilter membrane is high in strength and excellent in hydrophilicity, and possesses relatively high poriness. Resistance of the high strength nanometer modified ultrafilter membrane is reduced, water flux is increased, and service life of the high strength nanometer modified ultrafilter membrane is prolonged.

The invention relates to a superhydrophobic oleophobic modification method of a porous membrane, and belongs to the technical field of separation membrane. According to the present invention, based on the self-cleaning bionic principle, fluorosilane-modified SiO2 nanoparticles having low surface energy are dispersed in an organic solution to prepare a uniform dispersion liquid, and a porous membrane is subjected to superhydrophobic oleophobic modification by using a dynamic filtration method to prepare the amphiphobic composite membrane having good stability, wherein the water contact angle of the amphiphobic composite membrane surface can achieve 167.3+/-1 DEG C, the contact angle of diiodomethane can achieve 145.9+/-1 DEG C, and the good amphiphobic property is presented; and method has characteristics of no requirement of complex equipment, simple and easy-performing process and short preparation period, and the prepared membrane has characteristics of high flux and good pollution resistance.

The invention belongs to the membrane technology field, in particular to a polyester composite nanofiltration membrane as well as the manufacturing method thereof. The composite membrane is characterized in that a layer of aromatic polyester functional cortex is compounded on a porous supporting membrane through multivariate alcohol amine and multivariate acyl chloride interfacial polymerization. The novel polyester composite nanofiltration membrane of the invention has low operating pressure, and the adopted multivariate alcohol amine has the advantages of innocuity, low price, easy availability, etc. Besides, as the functional cortex contains tertiary amine and carboxylic groups, the membrane surface can present different charge properties through adjusting the pH value of separated feed liquid, thereby being applicable to more industrial requirements. Furthermore, the production cost is low, the industrial production basis is good, and the application prospect is wide.

The invention relates to the field of membrane technology, in particular to a high-temperature-resistant precision molecular weight cut-off ultrafiltration membrane and a preparation method thereof. The composition of raw materials and the definition of parameters in the preparation process of the base film ensure that the performance of the prepared wet base film is stable after the subsequent modification treatment, and can effectively improve its high temperature resistance; at the same time, combined with the modification process The definition of time, temperature and treatment method in the process makes the rejection rate of the ultrafiltration membrane to the molecular weight range of 2000-4000 reach more than 90%, which effectively improves the interception of the ultrafiltration membrane to low molecular weight substances and improves the quality of the filtration product .

The invention belongs to the technical field of ultra-sensitive test analysis, and particularly relates to an enhanced Raman detection substrate which can be in mass production and is wide in application, efficient, environment-friendly and based on a natural biology super-hydrophobic structure surface and a preparation method thereof. The PVD (physical vapor deposition) and a self-assembly or chemical plating and coating film technology are utilized to cover a precious metal layer on the natural biology super-hydrophobic surface to form rough and hydrophobic surface enhanced Roman detection hot spot area so that the enhanced Raman detection substrate is formed. The natural super-hydrophobic structure surface is plant pedals, plant leaves or inset wings. The precious metal is gold or silver and the thickness of the precious metal layer ranges from 5 nm to 50 nm. The hydrophobic SERS (surface enhanced Raman scattering) detection substrate has high sensitivity, and the detection limit can reach 10-9. The enhanced Raman detection substrate draws materials from the natural hydrophobic biology surface, so that the sensitivity is high, the performance is stable, the cost is low, and the pollution to the environment is prevented.

The invention discloses a wine-making preparation method adopting litchi fermentation. The method comprises the following steps: adopting pollution-free excellent quality litchi pulp to make fruit juice concentrate by means of a low-temperature ice-crystal method or a membrane concentration method, and blending the fruit juice concentrate with high dry wine; adding highly concentrated fruit juice frozen by the low-temperature ice-crystal method or the membrane concentration method into the mixture to keep the typical aroma of litchi fruit wine; adopting yeast strain, lactic acid strain and acetic acid strain to carry out multi-strain coordinated fermentation and adjusting the fermentation conditions; accelerating fermentation and conversion by fruit sugar and glucose cooled after high-temperature acid conversion of sucrose to improve the quality of fermented wine liquid; making use of ultra low temperature cryoprecipitation and triple filtration sterilization to solve the problem of deposition of products during storage and transportation; and adopting non-thermal sterilization filtration and concentration membrane technology to avoid the influence on fruit wine quality caused by thermal sterilization. The wine-making preparation method can obtain a natural litchi fermented wine product with palateful quality.

The invention provides a method for preparing high- purity konjak mannan with production purity over 95%. It comprises following steps: taking konjaku flour as raw material, producing mannan through enzymolysis, centrifuging and filtering and microfiltering and purifying, desalting with ion-exchange technology, decoloring, odour- removing, cutting off macromolecule with ultrafiltering membrane technology from sugar liquid, spray drying and getting high purity konjak mannan with purity over 95%. The invention is characterize by employment of enzyme technology, ion- exchange technology, membrane technology system, simple operation, good separation effect, low cost, no chemical pollution, realization of industrial production. The product can not only be used as functional health care product, but aslo as high- grade food ingredient, medical intermediate, and high- grade feed addictive.

The invention discloses a method and system for recovering lithium from a waste lithium iron phosphate battery. The method comprises the following steps that a positive plate is disassembled from thewaste lithium iron phosphate battery; a binder in the positive plate is removed, valuable metal elements in the positive plate are leached by an acid solution, and an acidified leaching solution is obtained; ultrafiltration treatment is carried out on the acidified leachate by using an ultrafiltration membrane; by using a nanofiltration membrane technology, lithium ions in the acidified leachate are separated from other cations different from lithium ions, a solution containing lithium and a solution containing other cations are obtained, and then a reverse osmosis technology is adopted for concentration and enrichment correspondingly, wherein the other cations comprise iron ions; and a lithium precipitant is adopted to precipitate and separate lithium ions in the lithium-containing solution, alkaline substances are adopted to precipitate and separate iron ions in the solution containing other cations, and lithium recovery is realized. According to the method and system, the ultrafiltration-nanofiltration-reverse-osmosis combined technology is adopted, and the method and system have the beneficial effects of simple process, environmental protection, less acid and alkali consumption, good and stable membrane separation effect and the like.

The invention provides a reinforced nitrogen and phosphorus removal method suitable for reclaimed water with a low carbon nitrogen ratio, belonging to the field of environmental engineering. The reinforced nitrogen and phosphorus removal method is based on a three-dimensional electrode biochemical membrane technology. According to the reinforced nitrogen and phosphorus removal method, the nitrogen and phosphorus removal is reinforced through electrochemistry and biological denitrification coupled process, a graphite rod is used as the anode of a reactor, foamed nickel is used as the cathode of the reactor, and a sponge iron and activated carbon composite padding is filled between the anode and the cathode; under the action of electric currents, the cathode generates hydrogen for autotrophic denitrification by hydrogen bacteria, and the anode generates CO2 for providing an inorganic carbon source for microorganisms and buffering the pH value of the system; the sponge iron and activated carbon composite padding forms lots of micro-primary batteries, and sponge iron is corroded to generate hydrogen so as to provide lots of electron donors for the microorganisms, promote the growth and metabolism of the autotrophic microorganisms and reduce the requirements on an organic carbon source, and the sponge iron is beneficial to formation of anaerobic environments in the system; the nitrogen removal effect by autotrophic denitrification is reinforced through the process above; and the sponge iron is corroded to generate Fe<2+> and Fe<3+>, and the hydrolysis product of the sponge iron enables the phosphorus in yielding water to be substantially reduced.

This invention discloses a method for preparing high-purity xylooligosaccharide from straw by using enzyme and membrane technology. The method comprises: steam-exploding straw, adding xylanase, hydrolyzing, centrifuging or filtering to obtain supernatant, performing nanofiltration or vacuum-concentration, acid-treating, centrifuging or filtering to obtain supernatant, performing active carbon adsorption, ultrafine filtration and ion exchange resin column adsorption, and concentrating or spray-drying to obtain high-purity xylooligosaccharide slurry or powder (xylooligosaccharide content is up to 70-95%). The residues of straw produced during xylooligosaccharide preparation can be used for papermaking, thus is environmentally friendly. Straw has an abundant resource, thus the cost is low. The method has such advantages as high treatment quantity, integrated operation, simple process, and high efficiency.

The invention relates to a structure of a high molecular composite membrane, in particular to a self-cleaning high molecular reverse osmosis membrane. The self-cleaning reverse osmosis membrane is characterized in that a porous support membrane is compounded with a polyamide ultrathin desalting layer through interfacial polycondensation of aromatic polyamine and polyatomic acyl chloride, and the compounded desalting layer is compounded with a temperature-sensitive functional high molecular material with low critical transition temperature through solution coating technology. The self-cleaning reverse osmosis membrane has the advantage that the desalting rate and water flux of the reverse osmosis membrane are not lower than those of the prior anti-pollution reverse osmosis membrane technology, and also has the advantages of universality, simplicity, high efficiency and the like; and a preparation method thereof is comparatively simple. The reverse osmosis membrane of the invention has wide application.