31results about How to "Low process temperature" patented technology

The invention provides a semiconductor processing method. The semiconductor processing method comprises the following steps: providing a wafer comprising a silicon layer, a dielectric layer and a bonding layer; metal layers are arranged in at least part of the cutting channels; manufacturing a metal protection layer on the surface of the bonding layer; sequentially etching the metal protection layer, the bonding layer and the dielectric layer along the cutting channel by adopting dry etching until the metal layer is etched, and forming a first etching groove section; the bottom of the first etching groove section is etched through laser etching until the metal layer is removed, and a second etching groove section is formed; etching downwards according to the width of the first etching groove section along the direction of the cutting channel until a preset depth in the silicon layer is reached; thinning the surface, deviating from the dielectric layer, of the silicon layer until the cutting channel is completely separated; and removing the metal protection layer to form an independent chip. The metal protection layer is added on the surface of the bonding layer, and the laser etching position is arranged below the bonding interface, so that the interface protection capability of the bonding layer is remarkably improved, warping is reduced, and the flatness and cleanliness of the bonding layer are ensured.

The invention relates to a method for eliminating residual stress in additive manufacturing of nickel-based superalloy, and relates to the technical field of additive manufacturing materials. According to the main technical scheme, stress relief treatment is carried out in the mode that continuous pulse current treatment is applied to the additive manufacturing nickel-based superalloy, so that at least part of residual stress in the additive manufacturing nickel-based superalloy is eliminated, and the additive manufacturing nickel-based superalloy subjected to stress relief treatment is obtained. According to the method, the residual stress in the additive manufacturing nickel-based superalloy can be effectively reduced. According to the method, the internal structure state of the original alloy is not changed, meanwhile, the method is low in treatment temperature, short in treatment time, more efficient and more energy-saving, and the requirement for green and sustainable development of the current industry is met.

The utility model discloses cold stamping forming aluminum stamping equipment which comprises a stamping machine base and a machine cover, an inner containing groove is formed in the stamping machine base, a hydraulic cylinder is installed on the inner wall of the bottom of the inner containing groove through bolts, a connecting table is fixedly installed on the top of the hydraulic cylinder, and a cooling pipe is installed in the connecting table through bolts. A first forming base is installed at the top of the connecting table through bolts, side tables are fixedly installed on the two sides of the interior of the punching machine base correspondingly, a gear motor is installed on one side of the outer wall of each side table through bolts, the output end of each gear motor is connected with a threaded column through a coupler, and the two sides of the outer wall of each threaded column are sleeved with moving parts in a threaded mode; the first forming seat is pushed by the hydraulic cylinder, bottom forming of aluminum materials is facilitated, after the threaded column in the side table rotates, the moving piece can drive the second forming seat to the position below a stamping part, the second forming seat is pushed in an upward moving mode, and therefore the first forming seat and the second forming seat can conduct alternate rapid cold stamping forming machining.

The invention belongs to the technical field of artificial crystals and radiation detection, and relates to a method for improving the performance of a rare earth orthosilicate scintillation crystal. The method for improving the performance of the rare earth orthosilicate scintillation crystal comprises the following steps: carrying out corrosion, plasma injection and annealing diffusion on the rare earth orthosilicate scintillation crystal, and finally realizing the improvement of the performance of the rare earth orthosilicate scintillation crystal.

The invention relates to an efficient photovoltaic module metal resource recovery method based on supercritical fluid, and aims to realize environment-friendly recovery of high-value metals such as silver, copper and aluminum in a photovoltaic module. According to the invention, supercritical carbon dioxide (CO2) is adopted as a green solvent, and an organic auxiliary agent and a coordination agent are added, so that the metal dissolving capacity is enhanced. The process comprises the steps of assembly crushing, supercritical extraction, pressure regulation and control, metal deposition and the like, and selective recovery of different metals is achieved by optimizing temperature and pressure conditions. According to the method, waste liquid pollution of a traditional acid-alkali method is avoided, the energy consumption is low, the recovery rate is high, supercritical CO2 can be recycled, and the cost and the environmental influence are reduced. The process can be widely applied to metal resource recovery of photovoltaic modules and other electronic wastes, and an innovative solution is provided for realizing green economy and sustainable development.

According to the zirconia implant surface modification treatment system and the transparent electrode preparation method, the upper end of a glass tube of the system is connected with a pneumatic connector, and the pneumatic connector is connected with a vacuum pump through a pipeline; the transparent electrode is sprayed on the outer wall of the glass tube; the rod-shaped electrode is fixed in the center of the inner side of the lower end of the glass tube; the zirconium oxide implant is inversely arranged above the rod-shaped electrode and is tightly attached to the rod-shaped electrode; the spraying area of the transparent electrode on the outer side of the glass tube completely wraps the zirconium oxide implant, and the spraying area of the transparent electrode on the outer side of the glass tube further wraps a rod-shaped electrode with a preset length; the transparent electrode is electrically connected with a low-voltage electrode of the plasma power supply, the rod-shaped electrode is electrically connected with a high-voltage electrode of the plasma power supply, and the plasma power supply excites plasmas through the transparent electrode and the rod-shaped electrode so as to modify the surface of the zirconium oxide implant. According to the method, the problems of limited use scene, difficulty in visual presentation, poor processing effect, high cost and incapability of meeting immediate processing in the prior art are solved.

The present invention provides a process for reducing graphitization of carbon steel, comprising the following steps: heating the carbon steel to 1000°C for austenitization and heat preservation, and then performing a controlled rolling and controlled cooling process to reduce the degree of graphitization of the carbon steel. The present invention uses a controlled rolling and controlled cooling process to roll in the non-recrystallization zone of austenite of high carbon steel, increase the deformation band in the deformed austenite grain, form fine lamellar pearlite or annealed pearlite, reduce the diffusion distance of carbon and prevent carbon from agglomerating to form graphite. After graphitization of high carbon steel, gas expansion will occur, and the product is prone to cracks. At present, alloy elements such as chromium, titanium, and niobium are usually added to the steel to prevent graphitization, which is expensive. The process method provided by the present invention does not need to add the above alloy elements, and can eliminate the graphite that has been formed in medium and high carbon steels; the process method of the present invention is simple to operate, has a low processing temperature, and has a low application cost, and can process ordinary medium and high carbon steels with graphitization problems.

The invention discloses an ultra-high hardness surface-strengthened GGr15 steel and a preparation method thereof, and belongs to the technical field of heat treatment of metal materials. The invention discloses an ultra-high hardness surface-strengthened GGr15 steel preparation method, which adopts a multi-stage composite carbonitriding process to quickly and efficiently form dispersed granular carbonitriding compounds on the surface of GGr15 bearing steel, which can not only realize high-efficiency carbonitriding on the surface of bearing steel, but also avoid abnormal growth and coarsening of carbonitriding compounds, and significantly improve the surface hardness and wear resistance of steel; the method significantly improves the carbonitriding speed and shortens the processing cycle, thereby realizing the practicality, economy and effectiveness of the carbonitriding treatment process, and the reagent cost used in the method is low, and the processing temperature and processing time are significantly reduced, showing great potential in energy saving, emission reduction and cost reduction.

The invention relates to a double-side plastic package structure and a manufacturing method thereof, the double-side plastic package structure comprises a first laminated board, an anisotropic conductive adhesive layer and a second laminated board which are laminated, the first laminated board comprises a first element, a first circuit layer, a first base layer and a first plastic package body, the first circuit layer is arranged at one side, facing the anisotropic conductive adhesive layer, of the first base layer, and the second circuit layer is arranged at the other side, facing the anisotropic conductive adhesive layer, of the second plastic package body; the first element is embedded in the first plastic package body and is electrically connected with the first circuit layer; the second laminated board comprises a second element, a second circuit layer, a second base layer and a second plastic package body, the second circuit layer, the second base layer and the second plastic package body are stacked in sequence, the second circuit layer is arranged on the side, facing the anisotropic conductive adhesive layer, of the second base layer, the second element is embedded in the second plastic package body and electrically connected with the second circuit layer, and the anisotropic conductive adhesive layer is bonded between the first circuit layer and the second circuit layer. The first circuit layer and the second circuit layer are electrically connected through the anisotropic conductive adhesive layer. The double-face plastic package structure is high in manufacturing yield and packaging reliability and low in manufacturing cost.

This invention provides a method for preparing high-nitrogen-content vanadium-containing steelmaking additive silicon vanadium ferronitride, comprising the following steps: 1) mixing vanadium oxide and a carbon source at a C / O molar ratio of 0.8-1, briquetting the mixture, and then placing it in a nitrogen atmosphere for a reduction nitriding reaction at 1100-1400 °C to obtain a one-step product; 2) crushing the one-step product obtained in step 1), mixing it with a silicon source and an iron source, briquetting the mixture, and then placing it in a nitrogen atmosphere for densification treatment at 1300-1500 °C to obtain high-nitrogen-content silicon vanadium ferronitride, wherein the silicon source is ferrosilicon and / or silicon. This invention can obtain high-purity, uniformly composed, and highly dense silicon vanadium ferronitride, improving the automation level and continuous production capability of the production process.

The invention relates to the technical field, and provides a phenolic resin / sucrose-based hard carbon material preparation method and material.The phenolic resin / sucrose-based hard carbon material preparation method comprises the steps that phenolic resin and N, N-dimethylformamide are adopted according to the proportion to prepare a solution A, sucrose, hexamethylenetetramine and deionized water are adopted according to the proportion to prepare a solution B, and the solution B is prepared into a phenolic resin / sucrose-based hard carbon material; adding the solution B into the solution A according to the proportion to prepare a phenolic resin / sucrose-based hard carbon precursor solution; placing the prepared phenolic resin / sucrose-based hard carbon precursor solution in a reaction kettle for solvothermal reaction, and cleaning and drying a solvothermal reaction product to prepare a phenolic resin / sucrose-based hard carbon precursor; grinding the prepared phenolic resin / sucrose-based hard carbon precursor, carrying out pre-oxidation treatment on a grinding product, and carrying out carbonization treatment on a product subjected to the pre-oxidation treatment, so as to prepare the phenolic resin / sucrose-based hard carbon material. The phenolic resin / sucrose-based hard carbon material with stable structure and excellent electrochemical performance can be efficiently prepared at low cost.

The application belongs to the technical field of stainless steel preparation, and discloses a cold-deformable and heat-treatable hardening Ni-free high-strength stainless steel and a preparation method thereof. The stainless steel comprises the following components in percentage by mass: Cr: 13-15%, C: 0.25-0.4%, Mn: 0.5-2%, Cu: 0.1-3%, Mo: 2-3%, Si: 0-0.5%, and the balance of Fe and inevitable impurities. The stainless steel does not contain Ni element, has a low work hardening rate (strain hardening index n≤0.185) and a fracture elongation rate of more than 20% in a soft state (annealed state), is cold-deformable, and has low raw material and processing costs; after quenching and aging heat treatment, the stainless steel not only has an optimal combination of strength and toughness (yield strength and tensile strength are more than 1300 MPa and 1600 MPa respectively, and elongation is greater than 10%), but also has a high yield strength ratio.

The application relates to the technical field of ultra-high-temperature ceramic materials, in particular to a preparation method of an ultra-high-temperature ceramic material, which comprises the following steps: uniformly mixing silicon-yttrium alloy powder I, zirconium boride and graphite to obtain initial powder; under an inert atmosphere, performing ball milling treatment on the initial powder, then performing forming processing to prepare ceramic green body material; and performing reaction melt impregnation on the ceramic green body material and silicon-yttrium alloy powder II at 1200-1500 DEG C to obtain ZrB2-YSi2-SiC ultra-high-temperature ceramic material. The application adopts the method of reaction melt impregnation to prepare high-density ultra-high-temperature ceramic material; under a high-temperature service environment, the binary-doped modified ZrB2 ceramic forms a dense oxide layer under high-temperature oxidation conditions, so as to improve the anti-oxidation corrosion performance of the material.

The present invention belongs to the technical field of olive oil processing, and specifically relates to a method for extracting olive oil. In order to increase the oil yield of olive oil and reduce the problem of loss of nutrients in olive oil, the present invention provides a method for extracting olive oil assisted by a high-voltage pulse electric field, comprising the following steps: washing and crushing olive fruits, sequentially performing high-voltage pulse treatment, stirring and fusing, solid-liquid separation, oil-water separation, and standing. The present invention uses a high-voltage pulse electric field to increase the oil yield of olives, reduce the acid value and peroxide value of olive oil, and increase the unsaturated fatty acid content, thereby improving the quality of olive oil, which is of great significance to the production of olive oil.

The invention belongs to the technical field of alloy surface oxidation films, and particularly relates to a preparation method of a Zr-Nb alloy surface pre-generated oxidation film and an alloy product thereof, and the preparation method comprises the following steps: carrying out high-temperature oxidation treatment on a Zr-Nb alloy by adopting high-temperature water vapor, and enabling the oxygen content in the high-temperature water vapor to be greater than or equal to 100 mu g / kg so as to form an oxide film on the alloy surface; the problem that the growth quality of an alloy pre-formed film in the prior art is difficult to meet the use requirement of a reactor structural member is solved by oxidizing the water vapor and controlling the rising concentration in the water vapor.

The invention discloses a process method for treating natural aromatic plant essential oil after separation and purification, and belongs to the technical field of aromatic plant primary oil processing. Comprising the following steps: S1, selecting aromatic plant primary oil; s2, heating and ultrasonic liquid separation treatment; s3, centrifugal treatment; s4, carrying out vacuum filtration treatment; s5, carrying out molecular distillation purification treatment to obtain light-component essential oil and heavy-component essential oil; s6, blending the light component essential oil and the heavy component essential oil; and S7, alcoholization treatment. According to the method, the aromatic plant primary oil is treated through ultrasonic liquid separation, centrifugation and vacuum filtration, water and impurities in the essential oil are separated and removed, and the essential oil which is low in water content and does not contain impurities is obtained; the preparation method comprises the following steps: preparing high-quality light-component essential oil and heavy-component essential oil, removing odor molecules and water molecules through molecular distillation separation and purification to obtain high-quality light-component essential oil and heavy-component essential oil which are pure in fragrance and do not contain water and impurities, and finally blending and combining the light-component essential oil and the heavy-component essential oil in different proportions, and alcoholizing to obtain the high-quality aromatic plant essential oil which is qualified in components and stable in quality.

The present invention belongs to the technical field of metal plate and strip manufacturing, and specifically discloses a low-temperature rolling preparation method for metal plates and strips. The present invention first performs low-temperature hot rolling on a metal plate and strip blank at 500-600°C, and then performs softening annealing after completion; then the metal plate and strip blank obtained after softening annealing is cold rolled for multiple times, and then performs recrystallization annealing to obtain a metal plate and strip. The process of first performing low-temperature hot rolling and then cold rolling disclosed in the present invention can quickly reduce the thickness of the metal plate and strip blank in the low-temperature hot rolling section, and by controlling the temperature of the low-temperature hot rolling, it can also avoid the generation of micro cracks; by cold rolling, a metal plate and strip of the required thickness can be obtained. The processing method disclosed in the present invention can greatly simplify the preparation process, improve the rolling efficiency, and can also reduce the processing temperature during the rolling process, reduce energy consumption, and thus reduce the preparation cost of the metal plate and strip; and ensure that the metal plate and strip have high toughness, strength and hardness.

The application relates to a method for preparing a low-temperature high-activity catalyst by a semi-dry ball milling method and application, and the method comprises the following steps: S110, preparing mixed mud B containing active component salt and carrier salt; S120, stirring the mixed mud B at a temperature of 20-40 DEG C to obtain a semi-dry viscous precursor mud; S130, ball milling the semi-dry viscous precursor mud product to obtain a high-uniform-dispersion precursor mud; and S140, drying and calcining the high-uniform-dispersion precursor mud to obtain a low-temperature high-activity catalyst. The catalyst has a low tail gas (NOx, VOC and CO) treatment temperature and high reaction catalytic activity, and the preparation method is simple in operation and simple in equipment requirement.

The invention discloses an additional formic acid steam catalytic body device convenient to disassemble and assemble, which comprises a catalytic converter, the catalytic converter comprises a honeycomb-shaped gas channel, and the inner surface of the honeycomb-shaped gas channel is coated with a catalyst layer; and the catalyst carrier is used for bearing and sealing the catalyst, and a connector connected with a formic acid atmosphere furnace gas circuit is arranged on the catalyst carrier. Compared with a formic acid atmosphere furnace with a catalytic device, the formic acid atmosphere furnace has the advantages that an atmosphere in-situ activation function can be added on the formic acid atmosphere furnace through an additional assembly mode on the premise of not additionally installing and modifying a gas circuit, so that the purchase and modification cost of a machine can be greatly reduced.

This invention discloses a PECVD equipment and a silicon wafer passivation method. The PECVD equipment includes a reaction chamber and an RF power supply. The reaction chamber includes a base, an electrode plate vertically disposed within the reaction chamber, and a wafer cassette. The wafer cassette is used to hold multiple stacked silicon wafers and is positioned at a predetermined location on the base, such that the wafer cassette, after entering the reaction chamber, can be arranged on both sides of the electrode plate. The wafer cassette has an opening so that the passivation-to-be-treated sides of the stacked silicon wafers face the electrode plate. The RF power supply is electrically connected to the electrode plate. The wafer cassette and the base are grounded. The reactive gas introduced into the reaction chamber dissociates to form plasma, which is then deposited on the passivation-to-be-treated sides of the silicon wafers adjacent to the electrode plate. This invention avoids the need for plating around the wafer, shortens process time, reduces process temperature, improves equipment efficiency, and reduces breakage rate.

The invention discloses a preparation method of a wear-resistant lubricating film layer of an aviation shaft part. The preparation method comprises the following steps: finishing the surface of the aviation shaft part; cleaning greasy dirt on the surface of the part; a protection tool is used for shielding the surface of the part without film deposition; hanging the part to a hearth of vacuum coating equipment; preparing a NiCr, Cr and W metal adhesion layer on the surface of the undercarriage by magnetron sputtering; preparing a diamond-like carbon film layer on the metal adhesion layer by using acetylene by using a plasma enhanced chemical vapor deposition method; the diamond-like carbon film layer has a gradient transition structure of NiCr, a NiCr / Cr mixed layer, a Cr / W mixed layer, a W / Cr mixed layer and a DLC functional layer, the prepared diamond-like carbon film layer is uniform, compact, excellent in wear resistance and high in controllability of the technological process, the thickness of the film layer is 3-6 microns, the hardness reaches HV2000 or above, the friction coefficient is lower than 0.2, and the diamond-like carbon film layer is suitable for being used as a high-temperature-resistant coating. And the use requirements of wear resistance and lubrication of shaft parts are met.

The invention relates to the technical field of material surface treatment, in particular to a salt bath chromium plating method for the surface of diamond powder. By adopting a composite chloride system with magnesium chloride as a main component and alkali metal chloride as an auxiliary component, a low-melting-point co-melt can be formed in the salt bath chromium plating process, the melting point can be reduced to 700 DEG C or below, the process temperature of salt bath chromium plating is remarkably reduced, meanwhile, the molten salt flowability is optimized, and the salt bath chromium plating quality is improved. It is ensured that chromium atoms are evenly diffused in the fused salt and chemically react with carbon atoms on the surface of the diamond to generate a uniform and compact chromium carbide layer, and heat damage to the diamond is effectively avoided; the chlorate powder is low in cost, easy to obtain and free of toxicity, harmful substances cannot be generated in the salt bath chromium plating process, the environmental protection property is good, the bottlenecks of high temperature, high consumption and uneven plating of traditional salt bath chromium plating are broken through, a low-cost and high-reliability surface modification technology is provided for the diamond / metal composite material, and the application prospect is wide. And the large-scale application of the diamond in the fields of electronic packaging and thermal management is directly promoted.

An object is to provide a crosslinked polyester resin that has high strength at room temperature but is capable of reprocessing, adhesion between films, and self-repair at a softening temperature thereof or higher, due to dynamic covalent crosslinks allowing bond exchange at high temperatures, that exhibits softening behavior due to bond exchange by a transesterification reaction even without containing any transesterification catalyst, and that exhibits self-adhesiveness, remoldability, and scratch repair properties. A crosslinked polyester resin in which a polyester resin having a carboxy group on a side chain is crosslinked by an epoxy-based crosslinking agent having a plurality of epoxy groups, wherein the epoxy-based crosslinking agent includes an epoxy amine compound having two or more tertiary amino groups and two or more epoxy groups in a molecule, and an amount of the epoxy amine compound is 3 to 30 parts by mole per 100 parts by mole of the carboxy group of the polyester resin.

This invention discloses a polyolefin adhesive for liquid cooling plates, a heat-bonding film, and a method for preparing the same. The polyolefin adhesive for liquid cooling plates comprises the following raw materials in parts by weight: 40-80 parts of a base resin; 5-40 parts of a tackifying resin; 1-35 parts of a flame retardant; 1-5 parts of a crosslinking agent; and 0.1-0.5 parts of an antioxidant. The base resin is maleic anhydride polyolefin resin, and the crosslinking agent includes aziridine crosslinking agent, or may also include at least one of polycarbodiimide, bisphenol A type epoxy resin, and bisphenol A type phenolic epoxy resin. This invention achieves a reduction in the curing temperature of the adhesive film and improves its performance.

The invention discloses a high-current bus connection terminal and a preparation method thereof, the high-current bus connection terminal comprises a substrate and a silver composite coating, the number of layers of the silver composite coating is 3-10, the thickness of the silver composite coating is 0.5-2mm, and raw materials comprise silver powder and / or composite transition element nanoparticles; the composite transition element nano-particles are palladium / gold nano-particles, and the mass ratio of the composite transition element nano-particles is in an equal difference increasing trend from the inner layer to the outer layer. According to the invention, the silver composite coating is sprayed on the surface of the base body of the connecting terminal, so that the penetration of sulfide can be effectively prevented, and the approaching of corrosive gases such as H2S and the like is repelled, thereby playing a role in preventing sulfuration corrosion; and the adopted cold spraying process has the advantages of being low in process temperature and small in heat input, workpiece thermal deformation and material structure damage cannot be caused, the material structure components are kept consistent, internal microstructures are arranged in order, and the conductivity and abrasion resistance of the silver layer can be improved.

The application discloses a strontium ferrite / polyether ether ketone composite magnet and a preparation method and application thereof, and belongs to the technical field of permanent magnet materials.The strontium ferrite / polyether ether ketone composite magnet comprises, in mass fraction, near Curie point magnetic field heat-treated strontium ferrite magnetic powder 84-95 parts, polyether ether ketone 5-15 parts, silane coupling agent 0.5-1.5 parts and lubricant 0.3-0.7 parts.The application adopts the above strontium ferrite / polyether ether ketone composite magnet and the preparation method and application thereof, realizes the synergistic improvement of magnetic performance, mechanical strength and heat resistance through intrinsic magnetic domain structure optimization, interface bonding strengthening and high densification structure design, and can meet the application requirements under the working conditions of high temperature, high reliability and high strength.

The invention relates to a water electrolysis hydrogen production diaphragm with a burr structure and a preparation method thereof, belongs to the technical field of hydrogen production diaphragms, and solves at least one of the problems of high surface resistance, high electrolysis voltage, large electric energy loss in a hydrogen production process and the like of a hydrogen production diaphragm in the prior art. The invention provides a water electrolysis hydrogen production diaphragm with a burr structure, the diaphragm is composed of a support silk screen and a composite porous layer with a burr structure, and the support silk screen is located in the middle of the composite porous layer; the composite porous layer is provided with large-aperture vertical through holes and reticular composite small holes, and the vertical through holes and the reticular composite small holes are burr-shaped holes. The diaphragm is suitable for normal-temperature alkaline water electrolysis hydrogen production, the ion transmittance is high, the surface resistance is low, the pressure resistance and the air tightness are good, the standard surface resistance at the room temperature is smaller than or equal to 0.1 omega / cm < 2 >, the cell voltage is smaller than or equal to 1.05 V under the test conditions that the electrolysis temperature is 90 DEG C and the current density is 5000 A / m < 2 >, and the energy loss in the electrolysis process is remarkably reduced. The diaphragm also verifies the feasibility of normal-temperature electrolytic hydrogen production, and can effectively relieve the thermal aging of electrolytic cell parts.

This invention provides a flexible electronic lead composite interface and its fabrication method suitable for extreme aerospace environments, belonging to the field of electrical device technology. The flexible conductive lead has a mounting hole at its root; it also includes a conductive sleeve corresponding to the mounting hole; screws and lock nuts sequentially fix the elastic compensation component, flexible conductive lead, conductive sleeve, and rigid mounting base; a liquid metal filling layer and an external resin sealing layer are arranged within the confined area and periphery between the root of the flexible conductive lead and the rigid mounting base. This invention offers higher mechanical stability, a more robust conductive interface, less sensitivity to thermal mismatch, better environmental adaptability, and lower processing temperature.

The utility model relates to the technical field of melt crystallization equipment, and discloses an efficient piperazine melt crystallization separation device which comprises a crystallization kettle body and a sweating kettle body, and a gas distributor is arranged in an inner cavity of the crystallization kettle body and used for introducing nitrogen; nitrogen is introduced into the top of the sweating kettle body, and a filter screen is arranged in an inner cavity; the crystallization kettle body is connected with the sweating kettle body through a crystallization transfer pump, and the bottom of the sweating kettle body is connected with a mother liquor tank, a sweat tank and a finished product tank respectively. By adopting the device disclosed by the utility model, piperazine can be purified by adopting a melt crystallization mode according to the characteristic that the difference between piperazine (the melting point is 109 DEG C) and methyl piperazine (the melting point is minus 6 DEG C) is large, the purity of the obtained product is higher than that of a rectification separation mode, and the energy consumption is lower than that of the rectification separation mode.

This invention belongs to the field of bioengineering technology, specifically relating to a preparation process for nano-sized water-soluble squalene. The process includes the following steps: S1, corn flour is treated and then mixed with pure water, followed by enzymatic hydrolysis using a compound enzyme to obtain a corn saccharification liquid for later use; S2, *Saccharomyces cerevisiae* GS-A3 is inoculated into a culture medium containing the corn saccharification liquid for fermentation; S3, after centrifugation of the fermentation broth, crude squalene is obtained by supercritical CO2 extraction; S4, after molecular distillation, the product is nano-sized. This invention uses corn as raw material, utilizing abundant starch resources, converting it into glucose through enzymatic hydrolysis, and producing squalene in *Saccharomyces cerevisiae* via the MVA pathway. This invention prepares high-yield, high-purity squalene, and through a special nano-saccharification process, improves the stability of squalene, extends its shelf life during application, and significantly improves its bioavailability. Furthermore, the technology used in this invention meets the requirements of green environmental protection.