56results about How to "Shorten the mass transfer distance" patented technology

The invention relates to a supergravity field micro-reactor for preparing a nanometer material. The supergravity field micro-reactor comprises a micro-reaction assembly, a material receiving groove provided with a material outlet, a first motor, a transmission system, a material inlet system and a support system, wherein the micro-reaction assembly comprises an upper disc and a lower disc, micro-grooves are respectively distributed on the bottom surface of the upper disc and the top surface of the lower disc, the center position of the lower disc is provided with a material inlet micro-pore channel, a 0.03-0.1 mm gap is arranged between the bottom surface of the upper disc and the top surface of the lower disc after the combination, the first motor drives the transmission system to operate so as to make the upper disc and the lower disc in the micro-reaction assembly rotate in opposite rotation directions, and an upper disc lifting system can be additionally arranged so as to conveniently adjust the gap between the bottom surface of the upper disc and the top surface of the lower disc in the micro-reaction assembly and wash the upper disc and the lower disc. With the supergravity field micro-reactor of the present invention, the nanometer material is prepared by using the liquid phase precipitation method, such that the high dispersion property and the uniform particle distribution of the nanometer material can be maintained while the treatment capacity can be increased and the clogging of the micro-reaction assembly can be avoided.

The invention relates to a two-enzyme co-expression technique and a two-enzyme coupling and immobilizing technique, and specifically relates to a co-expression preparation method of a site-specific mutant glucose isomerase and a D-allulose 3-epimerase, a coupling and immobilizing technique of the two enzymes and application of the coupled and immobilized two enzymes in producing allulose from jujube condensed juice. In order to solve health problems of people due to high-calorific value sugar, the invention provides a method for promoting the production of low-calorific value D-allulose from the recombinase glucose isomerase and the D-allulose 3-epimerase through co-immobilization and two-enzyme coupling by virtue of a multiple-enzyme coupling and immobilizing technique with D-glucose and D-fructose in the jujube condensed juice as the substrates, and also provides a method for site-specific mutagenesis of an amino acid at the 146th site of the glucose isomerase and co-expression thereof with the D-allulose 3-epimerase.

The invention relates to a COF thin membrane material for membrane distillation seawater desalination. Hydrophilic and hydrophobic pore channels which are different in size and change along with a depth gradient environment are formed in a COF thin membrane; the COF thin membrane is used for membrane distillation seawater desalination, and has the following characteristics that the membrane distillation flux and retention rate performance are excellent: the hydrophobic pore channels only allow water vapor to pass through and prevents liquid from passing through, and the theoretical retention rate reaches 100%; the material has the characteristic of high porosity, so that water vapor has more mass transfer channels in unit area; the crystallinity and the orientation are good, and the mass transfer resistance of the water vapor in regular through pore channels perpendicular to a substrate is low, so that the flux is improved; the thickness is nanoscale, so that the mass transfer distance of water vapor is greatly shortened, and the flux is improved.

The invention discloses a magnetic mesoporous composite material as well as a preparation method and application thereof. The magnetic mesoporous composite material particle comprises at least one non-porous or microporous magnetic particle and a mesoporous polymer skeleton penetrating through the composite material particle, and the polymer skeleton is a mesoporous polymer layer with at least twocharacteristic microstructural domains. The magnetic mesoporous composite material combines the advantages of a multi-microstructural-domain extraction material and a magnetic material, and can achieve better selective separation of target molecules by utilizing multiple effects of molecular exclusion, Van der Waals' force, dipole action, ion exchange and the like.

The invention discloses a preparation method for a microporous membrane with structural self-regulating characteristics for membrane distillation. The microporous membrane is prepared by mixing a temperature-sensitive high-molecular material having hydrophilic/hydrophobic transition characteristics with temperature change and a high-molecular membrane material and adopting a phase separation method, and the obtained microporous membrane has a double-layer membrane structure composed of a hydrophobic layer and a hydrophilic layer, wherein thicknesses of the hydrophobic layer and the hydrophiliclayer can be automatically regulated according to operating temperature in the membrane distillation process. The microporous membrane for the membrane distillation disclosed by the invention has anautomatically-adjustable hydrophobic layer thickness adapted to the operating temperature, greatly reduces mass transfer resistance and improves a permeation flux of the membrane, and at the same time, the corresponding thickened hydrophilic layer can significantly reduce temperature difference polarization and heat transfer loss of the whole membrane, and effectively solve a contradiction betweenmass transfer and heat transfer in the membrane distillation process; and the microporous membrane improves the membrane distillation process characteristics and thermal efficiency, and especially facilitates direct contact type membrane distillation concentration separation by fully utilizing waste heat of a lower-temperature material liquid, and has good application prospects.

The invention provides a black zirconium oxide ceramic and a preparation method thereof. The preparation method comprises the following steps: sanding mixed slurry containing oxide, a dispersant and water to obtain sanded slurry, mixing the sanded slurry with a bonding agent, and sequentially granulating, moulding, debinding and sintering to obtain a primary ceramic, and then performing a reduction reaction on the primary ceramic at 1350-1550 DEG C to obtain the black zirconium oxide ceramic. With the preparation method, the particle sizes of raw materials are reduced by adopting a sanding technology, so that the mass transfer distance between particles is shortened and the mixing uniformity between the raw materials is improved; the dense primary ceramic is obtained through granulation and sintering, and the chemical valence of titanium is changed in the reduction reaction of the primary ceramic, so that the transition track of electrons changes therewith, an absorbed band changes correspondingly, and thus the white ceramic becomes a black ceramic. Results of the embodiments show that the black zirconium oxide ceramic has the blackness value of 110-200 and uniform color distribution.

The invention discloses a continuous adjusting electrode distance-type desalting technology and reaction module for electric adsorption-regeneration. A reactor comprises a continuous adjusting electrode distance-type desalting reactor box body 1, a raw water tank 2, a pure water tank 3, a final concentrated water tank 4, a power supply 5, a water pump 6, and electric conductivity instruments 7 and8. The salt-containing waste water dominant on garbage percolation liquid discharged water is treated by using the continuous adjusting electrode distance-type desalting technology and reaction module, the desalting rate can reach up to 42.6 percent, the removal rate of Cl- is 73.3 percent, the desalting speed is 90 mg/(L.h), the electrode regenerative rate is 97.3 percent, and the water productivity is 91.7 percent. By adopting the movable slot-controlled continuous adjusting electrode distance-type continuous electric adsorption-regeneration way, the reaction module has the characteristicsof simplicity in operation, stable current density, high desalting rate, high desalting efficiency, high electrode regeneration rate, scaling phenomenon, high water productivity and long electrode service life, the desalting and recycling of low-salt-content industrial waste water can be realized, and the prospect in the field of environment protection salt-containing industrial waste water treatment is wide.

The invention discloses a filling material for sewage treatment and a preparation method of the filling material. The filling material is spherical and comprises a solid sphere in the centre, a sheet-like fan-shaped expansion area and a wool area on various surfaces, wherein the sheet-like fan-shaped expansion area and the wool area on various surfaces are arranged outside the solid sphere at intervals. The preparation method comprises the steps of manufacturing a spherical basal body, forming a fan-shaped surface in the expansion area, splitting and the like. By means of the unique structure and the process thereof, the filling material disclosed by the invention is good in oxygenizing efficiency and rapid to hang; the specific surface area of the filling material is high; attachment of microorganisms is promoted through the fan-shaped wool area; an aerobic state is formed in the sphere; an anoxic state is formed even in the spherical centre; a biological membrane has multiple varieties of the microorganisms, long food chain and higher processing capacity; the filling material is simple to install and convenient to operate and manage; the basal body shape of the filling material is a sphere; under the stirring of aerated bubbles, the filling material can rotate at high speed; therefore, the filling material is low in resistance and mould releasing and updating are easy; the filling material takes synthetic fibre polyurethane, which has good hydrophilia, as a substrate material.

The invention discloses a preparation method of a vertical orientation magnetic nanosheet/sodium alginate composite membrane. By means of the magnetic field responsiveness of a magnetic nanosheet, a vertical orientation structure is formed in a magnetic field so as to prepare a high-performance pervaporation composite membrane; wherein the magnetic nanosheets comprise nanosheets with intrinsic magnetic responsiveness or other nanosheets which generate magnetic responsiveness by loading magnetic response particles. The preparation method specifically comprises the following steps: uniformly dispersing magnetic nanosheets, physically blending the dispersion with sodium alginate to form a membrane casting solution, carrying out standing treatment for defoaming, spin-coating the membrane casting solution on a polyacrylonitrile ultrafiltration membrane, drying the composite membrane in a magnetic field at room temperature, and carrying out crosslinking treatment to obtain the magnetic nanosheet/sodium alginate composite membrane with vertical orientation. The preparation method is simple and controllable, and the raw materials are cheap and easily available. The composite membrane is suitable for pervaporation ethanol dehydration, has high permeation flux and high selectivity to water molecules, and has good operation stability at high temperature.

The invention belongs to the technical field of sewage treatment equipment, and particularly relates to a treatment device for concentrated landfill leachate. The treatment device comprises a tank body, wherein the tank body is provided with an ultrasonic treatment tank and an electrochemical treatment tank; a liquid inlet pipe and a liquid outlet pipe are mounted on the tank body; an ultrasonic generator is mounted on the bottom surface of the ultrasonic treatment tank; a rotating shaft is mounted in the ultrasonic treatment tank; a pushing blade is mounted on the rotating shaft; the pushingblade is just over the outlet, in the ultrasonic treatment tank, of the liquid inlet pipe; a defoaming plate is mounted on the rotating shaft; polar plates are mounted in the electrochemical treatmenttank; and the polar plates are composed of a negative plate and a positive plate which are respectively communicated with the positive electrode and the negative electrode of a power supply. The device is simple in structure, convenient to use, good in treatment effect and high in treatment efficiency.

The invention discloses a hydrophobic/hydrophilic composite membrane taking a nuclear track etching membrane as a base membrane as well as a preparation method and application of the same. The nucleartrack etching membrane is a polyethylene glycol terephthalate nuclear pore membrane, wherein one surface of the hydrophobic/hydrophilic composite membrane is a hydrophobic polyvinylidene fluoride membrane, and the water contact angle is 90-100 degrees; a hydrophilic polyethylene glycol terephthalate nuclear pore membrane is arranged on the other surface of the membrane, and the water contact angle is 55-65 degrees. The hydrophobic/hydrophilic double-layer membrane prepared by the method is narrow and uniform in pore size distribution, good in air permeability and good in mechanical strength.A novel composite membrane structure with excellent performance is provided for membrane distillation, wherein waste heat of low-temperature feed liquid is fully utilized for direct contact type membrane distillation, concentration and separation, and the permeation flux and the heat efficiency of the process are improved. The prepared hydrophobic/hydrophilic composite membrane is good in application effect in direct contact membrane distillation and stable in operation; compared with a PVDF hydrophobic membrane supported by polyester non-woven fabric, the permeation flux of the hydrophobic/hydrophilic composite membrane is increased by 23.70%.

The invention discloses an electrolytic bath of a pypocholoride generator. The electrolytic bath comprises a shell, an electrode assembly, multiple water baffles and two sealing parts. The electrode assembly is located in the shell. The multiple water baffles are provided with through holes and are arranged on the electrode assembly at intervals in a sleeving manner. The water baffles are locatedbetween the electrode assembly and the inner wall of the shell and are in sealed connection with the shell. The two sealing parts are arranged at the two ends of the shell in a sealed manner correspondingly. According to the electrolytic bath, it can be guaranteed that a saline solution all flows through the position between an anode plate and a cathode plate of the electrode assembly, the mass transfer distance can be reduced, the electrolytic efficiency can be improved, the heating value can be reduced, and operation energy consumption can be reduced.