9results about How to "Mass transfer speed" patented technology

The invention discloses a wire electrode workpiece differential synchronous fluctuation micro-electrolysis wire cutting machining method which comprises the steps that a wire electrode and a workpiece conduct synchronous fluctuation and differential movement at the same time, and synchronous fluctuation is continuous swing that the wire electrode and the workpiece incline upwards and downwards synchronously; the synchronous fluctuation of the line electrode and the workpiece enables the electrolyte in the machining area to flow along the reverse direction of the synchronous fluctuation, so that the machined product is scoured and flows out by the electrolyte along the reverse direction of the synchronous fluctuation; the differential motion is the same-direction differential motion of the line electrode and the workpiece in the machining direction, so that the line electrode and the workpiece are in a different-speed chasing type motion state in the machining direction, real-time transposition of a machining area is achieved, and electrolyte in a machining gap is updated; the device has the advantages that machining products in machining gaps are thoroughly scoured in all directions, electrolyte in the machining gaps fully flows, uniform distribution of conductivity is improved, and machining stability, machining precision and machining efficiency are improved.

The invention provides a method for producing methyl pentamethylene diamine and methylpiperidine through hydrogenation of methyl glutaronitrile, and belongs to the technical field of chemical engineering. Comprising the following steps: a mixed solution of 2-methylglutaronitrile and a hydrogen-dissolving solvent passes through a feeding pump and a preheater, and enters the lower part of a pipeline reactor together with a liquid-solid phase mixed material from a high-pressure circulating pump, hydrogen enters a gas distributor at the bottom of the pipeline reactor, and a formed gas-liquid-solid three-phase material is subjected to a catalytic hydrogenation reaction in a rising process from the bottom of the pipeline reactor; carrying out gas phase separation; unreacted hydrogen is circulated; and liquid-solid materials at the bottom of the high-pressure gas-liquid-solid phase separator are returned to the pipeline reactor through the high-pressure circulating pump. A middle produced liquid phase is sent to a low-pressure liquid-solid phase separator through pressure reduction, a catalyst separated at the bottom is recovered to a catalyst preparation system, the middle produced liquid phase enters a hydrogen-dissolving solvent recovery tower, a hydrogen-dissolving solvent recovered at the tower top is sent back to a raw material tank, and a product is obtained at the tower bottom. The method is more stable, reaction and separation equipment are small in size, and the production capacity is high.

The invention relates to a method for directly reducing micro-fine-particle iron powder from high-purity iron ore concentrate through hydrogen-based low-temperature fluidization, belongs to the technical field of mineral processing, and mainly relates to five stages of nitrogen replacement of air, preheating dehydration, low-temperature fluidization direct reduction, inert cooling and ore grinding screening. And fluidization direct reduction at the low temperature of 570-620 DEG C into metal iron powder is achieved, efficient ore grinding is conducted on the basis, and the micro-fine-particle iron powder with the particle size D50 smaller than or equal to 3 micrometers is prepared. Compared with a conventional 800-1400 DEG C high-temperature preparation process of the reduced iron powder, the energy consumption and the material consumption are greatly reduced, and meanwhile bonding and flow loss are effectively avoided. According to the technological method, H2 serves as reducing gas, fluidized roasting is adopted, and the technological method has the advantages of being simple in technological process, free of carbon emission, high in reduction efficiency and the like.

The present invention relates to the technical field of liquid desulfurization slag remover, and specifically discloses a high-efficiency liquid desulfurization slag remover, wherein the raw materials include by mass: 5-15 parts of limestone powder, 0.1-1 parts of catalyst, 20-25 parts of oleic acid, 1-3 parts of sodium hydroxide, 0.1-1 parts of yttrium chloride, 0.0403-0.1550 parts of sodium fluoride, 0.0131-0.3830 parts of sodium dichromate, 1-3 parts of ethylenediamine, 2-5 parts of methyl acrylate, 5-15 parts of sodium tripolyphosphate, and 20-35 parts of sodium chlorite. The present invention also discloses a preparation method of the above-mentioned high-efficiency liquid desulfurization slag remover. The present invention has no odor, no irritating smell, and no polluting components to the body and the environment; it is not easy to block the nozzle, and it can not only effectively remove the slag body in the softened dust in the smoke, prevent coking, effectively reduce energy consumption and cost, and significantly improve the efficiency of the entire desulfurization system.

The invention provides a composite adsorption material for efficiently removing U (VI) in nuclear wastewater and a preparation method thereof, the composite adsorption material is prepared by growing a defect-induced metal organic framework material UIO-66-P on a low-cost and renewable balsa wood base material in situ to form UIO-66-P at balsa wood composite aerogel, the UIO-66-P is synthesized through defect induction, and the UIO-66-P at the balsa wood composite aerogel is used for adsorbing U (VI) in nuclear wastewater. According to the preparation method, the material hydrophilicity and active adsorption sites are increased, so that the uranium ion adsorption capacity is remarkably improved, the maximum uranium adsorption capacity in a low-concentration aqueous solution can reach 594 mg.g <-1 > which is far better than that of a traditional inorganic material, a carbon-based material and an existing MOF material, and the problem of low adsorption efficiency in a low-concentration environment is successfully solved; the composite material has excellent reproducibility, can still keep efficient uranium adsorption performance after multiple adsorption-desorption cycles, remarkably reduces long-term use cost and waste generation, has wide market application prospects, and provides an efficient solution for sustainable development of nuclear energy industry.

The present invention provides a silicon nitride ceramic composition, which comprises 85-92% α-Si by mass. 3 N 4 Powder, 0‑8% β‑Si 3 N 4 Seed crystal, 0.1‑3%MgO, 0.01‑1%CaO, 3‑8% R 2 O 3 , the total mass of MgO and CaO is recorded as m （Mg+Ca） , R 2 O 3 The mass is denoted as m R , m （Mg+Ca） and m R The following relationship is satisfied: wherein R is a rare earth element. The silicon nitride ceramic prepared by sintering the silicon nitride ceramic composition has both high thermal conductivity and high strength.

The present invention discloses a composition containing plant extracts and its application, and belongs to the technical field of dressing production. First, the composition containing plant extracts provided by the present invention is prepared by encapsulating plant extracts with liquid lipid materials and then freeze-drying. Then, the plant extracts provided by the present invention are composed of Hypericum perforatum extracts, okra extracts and broccoli seed extracts. Next, the present invention also provides methods for preparing Hypericum perforatum extracts and okra extracts. Finally, the present invention applies the prepared composition containing plant extracts in the field of dressings, showing excellent antibacterial properties.

The invention discloses a wire electrode workpiece differential synchronous wave micro-electrolytic wire cutting processing method, comprising synchronous wave and differential movement of the wire electrode and the workpiece at the same time, wherein the synchronous wave is a continuous swing of the wire electrode and the workpiece in which they are synchronously tilted upward and downward, and the synchronous wave of the wire electrode and the workpiece causes the electrolyte in the processing area to flow in the opposite direction of the synchronous wave, so that the processed product is washed out by the electrolyte in the opposite direction of the synchronous wave; the differential movement is a differential movement of the wire electrode and the workpiece in the same direction in the processing direction, so that the wire electrode and the workpiece are in a different speed chasing motion state in the processing direction, so that the real-time position change of the processing area is realized, and the electrolyte in the processing gap is updated; the invention has the advantages of all-round and thorough washing of the processed product in the processing gap, sufficient flow of the electrolyte in the processing gap, improved uniform distribution of conductivity, and improved processing stability, processing accuracy and processing efficiency.

The application discloses an N-Boc-L-phenylalanine molecular imprinting polymer and a preparation method and application thereof. The N-Boc-L-phenylalanine molecular imprinting polymer is prepared by using a bulk polymerization method, taking N-Boc-L-phenylalanine as a template molecule and allylamine as a functional monomer, and under the participation of a crosslinking agent and an initiator. The molecular imprinting polymer has specific recognition ability to N-Boc-L-phenylalanine. The maximum adsorption capacity of the molecular imprinting polymer to N-Boc-L-phenylalanine reaches 14.50 mg / g, and the imprinting factor IF value is as high as 10.33. The adsorption amount of the molecular imprinting polymer to N-Boc-L-phenylalanine is significantly higher than that to N-Boc-D-phenylalanine, and the molecular imprinting polymer has good chiral recognition ability. The molecular imprinting polymer can be used for selective recognition, adsorption and enrichment of N-Boc-L-phenylalanine.