185results about How to "Low raw material cost" patented technology

The invention relates to the technical field of LEDs, in particular to a quaternary yellow-green LED epitaxial wafer and a preparation method thereof. The quaternary yellow-green LED epitaxial wafer sequentially comprises a GaAs substrate, a GaAs buffer layer, an N-type gradient doped waveguide layer, a single quantum well active layer, a P-type gradient doped waveguide layer, a P-type self-absorption layer, a P-type transition layer and a P-type periodic current expansion layer from bottom to top. Through the design that the N / P type gradient doped waveguide layer is combined with the single quantum well active layer, the P type self-absorption layer and the P type GaP / GaAsP periodic current expansion layer, and the MOCVD technology is adopted for growth, the obtained low-brightness and high-reliability quaternary yellow-green LED epitaxial wafer structure has the advantages of being high in antistatic performance, excellent in aging performance, good in surface flatness and uniformity, high in light emitting efficiency and the like. The method has the characteristics of simple process, low production cost and raw material cost and the like, is used for replacing two-component and three-component LEDs grown by an LPE technology, and has better reliability and application prospect.

The invention belongs to the technical field of recovery of retired / waste lithium ion batteries, and particularly discloses a method for preparing a lithium iron manganese phosphate positive electrode material from lithium iron phosphate waste powder, which comprises the following steps: (1) preparing waste lithium iron phosphate powder; (2) adding a lithium source, a manganese source and a phosphorus source into the mixture, and mixing, so that the element molar ratio of Li to Fe to Mn to P in the mixture is (1.0-1.2): (0.1-0.9): (0.9-0.1): 1; and (3) carrying out hydrothermal treatment or heating solid-phase treatment on the mixture in a protective atmosphere to obtain the lithium iron manganese phosphate positive electrode material. According to the method, the decommissioned / waste lithium iron phosphate positive electrode material is taken as a raw material, the lithium iron manganese phosphate positive electrode material is obtained through regeneration under the condition that a decommissioned lithium iron phosphate olivine crystal structure is not damaged, all components in the lithium iron phosphate waste material are utilized to the maximum extent, and the process is low in energy consumption, simple in flow and low in cost.

The invention discloses a positive electrode active material and a preparation method thereof, a battery monomer and a power utilization device, the positive electrode active material comprises lithium-containing phosphate, and an X-ray diffraction pattern of the positive electrode active material in a full charge state satisfies the following conditions: the positive electrode active material has a (311) crystal face peak in a range of 35-36 degrees, has a (011) crystal face peak in a range of 20-21 degrees, and has a (011) crystal face peak in a range of 0-30 degrees. And the ratio of the peak intensity I311 of the (311) crystal face peak to the peak intensity I011 of the (011) crystal face peak satisfies I311 / I011 > = 0.008. The positive electrode active material provided by the invention can improve the cycle performance of the battery.

The invention discloses a halogen modified ultra-microporous carbon material, and a preparation method and application thereof. The preparation method comprises the following steps: S1, grinding and uniformly mixing a mixture of terephthalonitrile or a halogen derivative of terephthalonitrile and anhydrous zinc chloride according to a molar mass ratio of 1: (1-1.2) in a dry inert sealed atmosphere; s2, transferring the ground mixture into a heating container in an inert sealing atmosphere, vacuumizing and sealing, and then carrying out high-temperature heating carbonization treatment; wherein the carbonization temperature is 300-600 DEG C, and the carbonization time is 35-45 hours; s3, after the heating container is cooled to room temperature, taking out a reaction product in the heating container, and grinding again; S4, pouring the ground product into a diluted hydrochloric acid solution, stirring and washing; and washing and filtering the product by using deionized water and ethanol, and then carrying out vacuum activation to obtain the final ultra-microporous carbon material with crystallinity. The material is low in energy consumption, stable in structure, large in gas adsorption capacity, high in separation selectivity and capable of being applied to gathering and separation of greenhouse gas in industrialization.

The invention discloses a Fe3O4 (at) FeMgAl-LDH (layered double hydroxide) magnetic catalyst. The Fe3O4 (at) FeMgAl-LDH magnetic catalyst comprises FeMgAl-LDH and Fe3O4, the FeMgAl-LDH is prepared by taking a solution A and a solution B as raw materials and adopting a coprecipitation reaction; the solution A is a mixed aqueous solution of Fe < 3 + >, Al < 3 + > and Mg < 2 + >, and the solution B is a mixed aqueous solution of OH <-> and CO3 < 2->. By adding the magnetic Fe3O4, the specific surface area of the catalyst is increased, the dispersity and catalytic activity of the catalyst are improved, the raw material conversion rate and the product yield are remarkably increased, and recycling of the catalyst is facilitated. The invention discloses an application of a Fe3O4-coated FeMgAl-LDH magnetic catalyst in catalysis of a condensation reaction of furfural and acetone. Under the optimal reaction condition, the conversion rate of furfural reaches 100%, and the total yield of a primary condensation product FAc and a secondary condensation product F2Ac is 99.8% or above.

The invention discloses construction and application of a genetically engineered bacterium for synthesizing 2 '-fucosyllactose from glucose and xylose, and belongs to the field of microbial genetic engineering and the field of biosynthesis. According to the invention, escherichia coli is taken as an original strain, and the productivity of engineering bacteria is improved through strategies such as reconstruction of a glucose transport pathway, knockout of a competitive bypass, elimination of a byproduct pathway, up-regulation of key enzymes in a de novo synthesis pathway, enhancement of xylose utilization, overexpression of efficient alpha 1, 2-fucosyltransferase and the like; glucose and xylose are used as substrates to realize efficient synthesis of lactose and 2 '-fucosyllactose. In a shake flask fermentation experiment process, the yield of the 2 '-fucosyllactose can reach 6.53 g / L under the condition that no exogenous lactose is added. Under the condition of batch feeding, the yield of 2 '-fucosyllactose in a 5L fermentation tank reaches 27.53 g / L, and the method has industrial production potential.

A device and method for continuous fluorination of perfluoropolyether end groups, belonging to the technical field of fluorine chemical industry. In the device, an ultraviolet mercury lamp (9) is placed in a cold trap (8), the cold trap (8) is placed in a liquid storage tank (6), the volute mixer (3) is connected to a tubular reactor (7), the tubular reactor (7) is spirally wound around the cold trap (8), and the liquid storage tank (6) is filled with pure water. The method steps are as follows: pure water is introduced into the liquid storage tank (6), and the ultraviolet mercury lamp (9) is turned on; a mixed gas of perfluoropolyether with unsaturated groups and fluorine gas is introduced into the volute mixer (3); under the ultraviolet irradiation condition of the ultraviolet mercury lamp (9), the material fully mixed by the volute mixer (3) enters the tubular reactor (7) for fluorination end-capping reaction. The present invention improves the yield and production efficiency of saturated perfluoropolyether, reduces energy consumption, has a simple process, and is suitable for industrial large-scale production.

The invention belongs to the technical field of casting, and particularly relates to a method for preparing a water-soluble composite salt core based on a slurry direct-writing forming 3D printing technology. A water-soluble composite salt core material for low-melting-point alloy casting is composed of pretreated water-soluble inorganic salt, a binder and an additive, the pretreated water-soluble inorganic salt is obtained by mixing a coating solution and inorganic salt powder, and the mass percent of the coating solution and the inorganic salt powder is 100%. The ratio of the pretreated water-soluble inorganic salt to the binder to the additive is (60-80%): (20-30%): (0-10%). Compared with a traditional method for preparing a water-soluble salt core, the water-soluble composite salt core material has the advantages that the water-soluble salt core formed through slurry direct writing can be used for rapidly forming parts without a mold, the process is simple, the raw material cost is low, the equipment requirement is low, and rapid and accurate mold-free forming of high-precision complex salt cores can be achieved; the problem that complex salt cores are difficult to integrally form is solved.

The invention discloses a rubber waterstop fixing device, and relates to the technical field of building construction, the rubber waterstop fixing device comprises a U-shaped fastener, the U-shaped fastener is used for fixing a rubber waterstop on a mold plate, the U-shaped fastener is of a U-shaped structure, and a gap between two side edges of the U-shaped fastener is used for accommodating the rubber waterstop and the mold plate; a fastening hole for mounting a bolt is formed in the U-shaped fastener; the rubber waterstop fixing device has the beneficial effects that the labor cost and the raw material cost are reduced, compared with the prior art, when the rubber waterstop fixing device is used for fixing a rubber waterstop, the rubber waterstop fixing device is clamped on the rubber waterstop and a mold plate, the rubber waterstop and the mold plate are clamped between the U-shaped fasteners, and then preliminary fixing of the rubber waterstop can be completed; and then the bolts in the fastening holes and the bolts in the reinforcing holes are tightened in sequence, so that the rubber waterstop can be fixed, the installation is convenient, the installation efficiency is improved, and the labor cost is reduced.

The invention discloses an organic conjugated fused ring polymer positive electrode material, and relates to the technical field of batteries. The molecular structural formula of the organic conjugated fused ring polymer positive electrode material is # imgabs0 #. The invention also provides a preparation method of the organic conjugated fused ring polymer positive electrode material and application of the organic conjugated fused ring polymer positive electrode material in a wide-temperature-range aqueous zinc ion battery. The raw materials used in the invention are green and environment-friendly, the price is low, the preparation process is simple, and when the positive electrode material is used as an aqueous zinc ion battery positive electrode material, excellent electrochemical properties such as high magnification, high cycle stability and excellent weather resistance can be realized. Therefore, the method is very suitable for large-scale popularization and application.

The invention discloses a near-infrared luminescent material as well as a preparation method and application thereof. The chemical formula of the near-infrared luminescent material is Na3-yM2-x-z (PO4) 2F3: xCr < 3 + >, yR < 3 + > and zN, M is a trivalent metal element, Cr < 3 + > is a luminescent central ion, R is a trivalent rare earth element, N is a divalent doping element and / or a trivalent doping element, x is selected from 0.0001 at.%-30 at.%, y is selected from 0 at.%-50 at.%, and z is selected from 0 at.%-50 at.%. The light-emitting material and a blue light or red light chip are packaged to obtain an LED device, and the LED device can be used as a near-infrared light source to be used in the fields of analysis and detection, iris recognition, automobile sensing, security and protection and the like.

The invention provides a UV-cured color-tunable dual-emission room-temperature phosphorescent material as well as a preparation method and application thereof, and belongs to the technical field of color-tunable room-temperature phosphorescent functional materials. According to the invention, nitrogen-doped or nitrogen-metal ion-doped carbon quantum dots are used as a main ultraviolet light response phosphorescence color development center, a polyacrylamide and cellulose-based derivative double network is used as a substrate and a secondary phosphorescence color development center, acrylamide double bonds are broken into polyacrylamide through ultraviolet light, and further dehydration is carried out; the prepared room-temperature phosphorescent material shows different visible light colors under the excitation of ultraviolet light with two wavelengths, is tunable in color, can be applied to the fields of anti-forgery ink, optical information coding, photoelectric devices, advanced information encryption, humidity sensing detection and the like, and has wide application prospects. Wide popularization and application prospects are realized.

The invention relates to the technical field of concrete preparation, and particularly discloses mass concrete and a preparation method thereof. The concrete is prepared from the following raw materials in parts by weight: 330-450 parts of cement, 430-510 parts of fine aggregate, 1000-1200 parts of coarse aggregate, 3-9 parts of a viscosity reducer, 3-10 parts of an additive, 50-100 parts of fly ash and 5-15 parts of an MXene composite phase change material. By introducing the MXene composite phase change material, the internal and external temperature difference and the temperature peak value caused by heat release of hydration reaction of mass concrete before and in the middle period of curing are effectively reduced, so that the generation of temperature cracks is inhibited. In addition, the concrete effectively relieves temperature stress caused by uneven temperature distribution in a large-temperature-difference environment, and the volume stability of the structure is improved. The concrete has excellent working performance, weather resistance and construction performance, high early strength and stable performance.

The invention relates to a 42CrMo-based self-lubricating material with a surface texture soft coating composite interface structure and a preparation method of the 42CrMo-based self-lubricating material. 42CrMo steel is mainly used as a substrate material, and a WS2 soft coating is combined on the surface of the substrate material through a magnetron sputtering deposition process; and then a composite texture of a hexagonal texture and a regular polygon texture is prepared on the surface of the WS2 soft coating by adopting a laser marking technology, and grooves and grooves of the composite texture are filled with a soft metal lubricant Sn-Cu-Zn and a reinforced phase TiB2 by adopting a high-temperature infiltration technology, so that the 42CrMo-based self-lubricating material with the surface texture soft coating composite interface structure is obtained. According to the 42CrMo-based self-lubricating material and the preparation method thereof, structural optimization of the surface texture and compounding of the soft metal lubricant and the lubricating coating are introduced into interface construction of the self-lubricating material, the lubricating performance is improved while the interface bearing capacity is guaranteed, the prepared 42CrMo-based self-lubricating material has excellent antifriction and wear-resisting performance, and the tribological performance of the 42CrMo steel material is effectively improved.

The invention discloses a nano high-entropy phosphide / carbon composite material and a preparation method thereof, and the preparation method comprises the following operation steps: (1) soaking phosphorus-containing resin in an acid solution to adjust the pH value of the phosphorus-containing resin, drying and crushing; (2) adding water, fully stirring to obtain a mixture, uniformly mixing Fe salt, Co salt, Ni salt, Cu salt and Mo salt solutions, adding into the mixture, and recording as M + resin; and (3) adding an alkaline substance, grinding, carrying out heat treatment, and obtaining the nano high-entropy phosphide / carbon composite material after the reaction is finished. According to the method, the phosphorus-containing resin is adopted as the raw material, the adopted resin is environmentally friendly and low in price, and the raw material and preparation cost is low; the method disclosed by the invention is simple to operate, and the particle size of the prepared nano high-entropy phosphide / carbon composite material reaches a nano scale and is controllable.

This invention relates to a layer-by-layer composite electrochromic thin film of Mo-WO3 and Bi-WO3 and its preparation method. The method includes: dissolving tungstic acid in hydrogen peroxide solution to obtain a peroxytungstic acid solution; adding a Bi-containing substance to the peroxytungstic acid solution and heating until the Bi-containing substance is completely dissolved to obtain a bismuth-doped peroxytungstic acid sol; adding a Mo-containing substance to the peroxytungstic acid solution and heating until the Mo-containing substance is completely dissolved to obtain a molybdenum-doped peroxytungstic acid sol; spin-coating the bismuth-doped peroxytungstic acid sol onto a conductive glass substrate and calcining to obtain a bismuth-doped WO3 thin film; and spin-coating the molybdenum-doped peroxytungstic acid sol onto the bismuth-doped WO3 thin film and calcining to obtain a Mo-WO3 / Bi-WO3 thin film. This invention employs a layer-by-layer composite structure design. The Bi-WO3 bottom layer significantly enhances the film-substrate adhesion and improves cycle stability; the Mo-WO3 surface layer ensures high optical modulation rate, fast response, and memory effect, achieving a synergistic performance improvement.

The present invention provides a novel cobalt-free positive electrode material and a preparation method thereof. The chemical formula of the cobalt-free positive electrode material is Li m Ni x Fe y Al z M (1‑x‑y‑z) O2·nB2O3, wherein M is one or more elements selected from W, Ta, Ti, Si, Mg, Ca, Sr, Ba, Ra, Sc, Y, Zr, Nb, Hf, Cr and Mo, 0.95≤m≤2, 0.05≤x≤0.9, 0.05≤y≤0.9, 0.02≤z≤0.3, 0≤n≤0.005. The cobalt-free positive electrode material of the present invention has the advantages of low raw material cost, simple preparation process, good repeatability, easy mass production, relatively friendly to the environment, etc., and the discharge platform voltage is higher than that of lithium iron phosphate positive electrode material.

The invention relates to the technical field of foundation construction, and provides a construction process for replacing and filling construction waste in a culvert foundation, which comprises the following steps: obtaining the construction waste, sorting, classifying and pretreating the construction waste, removing impurities in the construction waste, and obtaining regenerated filler with preset grading; excavating and treating a foundation pit; and layered filling and compaction are conducted, specifically, the regenerated filler is filled into the foundation pit in a layered mode, and compaction equipment is adopted for compaction after each layer of regenerated filler is filled. By means of the arrangement, harmful impurities in construction waste can be removed, the strength, quality and uniformity of regenerated filler can be guaranteed, the uniformity of the filler can be guaranteed through layered filling, the compactness and stability of the filler can be effectively controlled, gaps in the filler can be reduced through layered compaction, the compactness and bearing capacity of each layer of filler are guaranteed, and the construction efficiency is improved. Therefore, the overall stability and bearing capacity of the foundation are ensured.

The invention provides a tape casting solvent catcher which comprises a rack, a refrigerating system is arranged on the rack and comprises an evaporator, a steam inlet is formed in the evaporator and communicated with a waste gas header pipe in the tape casting process, and the two output ends of the evaporator are communicated with a filter and a purified liquid storage device respectively. Condensable gas in the waste gas is condensed into liquid to enter the purified liquid storage device, an air exhaust port is formed in the filter, and non-condensable gas in the waste gas enters the filter to be filtered and then is exhausted through the air exhaust port. According to the invention, the organic solvent in the waste gas of the tape casting process can be effectively recovered, the condensable organic solvent is condensed into liquid, the liquid is stored in the purified liquid storage device and finally discharged back to the tape casting equipment storage tank, so that the solvent is recycled, the loss of the solvent is reduced, the raw material cost of an enterprise is reduced, and the economic benefit of the enterprise is improved.

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 utility model discloses a slurrying system for mixing quicklime with carbide slag. The slurrying system comprises a carbide slag feeding device, a quicklime feeding device, an ash-melting feeding screw feeder, an ash-melting machine, a lime milk sieve, a hot water pipe network, a lime milk barrel, a lime milk pump and an ammonia distillation system, the system disclosed by the utility model can be used for preparing the quicklime slurry for producing sodium carbonate by an ammonia-alkali method from the carbide slag, so that the recycling value of the carbide slag is improved, the raw material cost for preparing the quicklime slurry is reduced, and the consumption of limestone and coke is reduced. And the carbide slag is recycled, so that environmental pollution caused by discharge and accumulation is avoided.

The application discloses a kind of porous microspheres based on titanium slag and its preparation method and application, belong to absorbent and solid waste secondary utilization technical field.The application first dries titanium slag, is screened after mechanical ball milling, obtains titanium slag powder, titanium slag powder is added to oxalic acid dissolved in aqueous solution, is uniformly prepared slurry, under the condition of stirring, slurry is added dropwise to oil phase, under the action of mechanical stirring, then aging treatment is formed into ball, solid-liquid separation is carried out, and the obtained solid is calcined, and the porous microspheres based on titanium slag are obtained after screening.The application can prepare the more excellent applicability of porous microspheres by treating titanium slag, reduce the raw material cost problem of producing porous microspheres, and the prepared porous microspheres can be applied to CO2 capture, so as to achieve the effect of waste treatment and pollution control.

The invention relates to the technical field of organic synthesis, and discloses a synthesis method of (E)-2-methyl-alpha-methoxyimino methyl phenylacetate. According to the invention, o-methyl phenylacetonitrile is used as a raw material, and a series of steps such as oximation, first methylation, alkaline hydrolysis, second methylation and acidic rearrangement are carried out to obtain (E)-2-methyl-alpha-methoxyimino methyl phenylacetate. According to the method provided by the invention, the byproduct salt amount is greatly reduced, and the atom utilization rate is greatly improved; the organic solvent dosage is reduced, and the equipment utilization rate is greatly improved; according to the method, methylation reaction conditions are optimized, high reaction activity is obtained while the use amount of a methylation reagent is reduced, meanwhile, excessive methane chloride needing to be recycled is greatly reduced due to the fact that the use amount of methane chloride is reduced, the tail gas treatment amount is small, equipment is relatively simple, and the operation cost is low; besides crystallization operation, the whole reaction process is gas-liquid or liquid-liquid reaction, so that the mass and heat transfer effect is improved, and subsequent continuous transformation is facilitated.

This invention discloses a carbon-sulfur battery and its preparation method. A sulfur-carbon compound containing C-S and S-S (sulfur atom number ≤ 4) structural units is used as the positive electrode active material. In-situ pre-lithiation is performed inside the battery package to prepare the positive electrode, and a carbon-based material is used as the negative electrode active material to prepare the negative electrode. The resulting carbon-sulfur battery with the above positive and negative electrode system is further assembled. This battery utilizes the lithium fusion reaction of the sulfur-carbon compound positive electrode material and the intercalation or alloying lithium fusion reaction of the carbon-based negative electrode to achieve an electrochemical redox reaction between the positive and negative electrode systems, thereby converting chemical energy into electrical energy. The sulfur-carbon compound positive electrode material exhibits high structural stability during the lithium fusion reaction. Compared to the loss of positive electrode active material caused by soluble lithium polysulfides during the discharge of elemental sulfur positive electrodes, a positive electrode with high cycle stability can be obtained. Furthermore, by utilizing the reversible lithium intercalation / deintercalation or alloying reaction of carbon-based materials to replace the unstable and highly active metallic lithium negative electrode, high cycle stability of the negative electrode can be achieved.

An air control valve for use in dental treatment equipment includes a valve seat and a core seat, with the core seat installed within a mounting hole in the valve seat. An air inlet chamber and an air outlet chamber are provided between the inner wall of the mounting hole and the outer wall of the core seat. The outer wall of the valve seat has an air inlet communicating with the air inlet chamber and an air outlet communicating with the air outlet chamber. A valve core is installed within a telescopic hole in the core seat, the telescopic hole including a blocking section, an air outlet section, and an air inlet section connected sequentially along the axial direction. The air inlet section has an air inlet port communicating with the air inlet chamber, and the air outlet section has an air outlet port communicating with the air outlet chamber. The front end of the valve core extends out of the valve seat through a through-hole. This separate structure combining the valve seat and core seat allows the valve seat to be injection molded or cast from low-cost materials, reducing the amount of brass used. Furthermore, since the valve seat is injection molded or cast, complex precision machining is unnecessary, improving production efficiency and achieving the goal of reducing raw material and manufacturing costs, effectively meeting the needs of large-scale production.

The invention discloses conductive copper paste and a preparation method thereof, and belongs to the technical field of photovoltaic materials. The conductive copper paste takes base metal copper instead of noble metal silver as a core conductive component, and solves the problem of high cost of the existing conductive silver paste. The copper paste comprises the following components in percentage by weight: 72-85% of copper powder, 2.5-8% of glass powder, 8-12% of an organic carrier and 1-9% of an additive, the copper powder is spherical powder with D50: 0.5-5 [mu] m, preferably 1-2 [mu] m; the glass powder is prepared from at least two components such as PbO and SiO2 through a specific process, and the additive comprises an organic antioxidant and an inorganic antioxidant, so that a dual antioxidant system is formed. The special low-temperature glass powder is used for reducing the sintering temperature and blocking diffusion of copper ions, the copper paste is sintered at the high temperature of 500-600 DEG C in the air without inert gas protection in cooperation with a dual-oxidation-resistant scheme, the photoelectric conversion efficiency of the prepared solar cell reaches 26.586% to the maximum and is equal to that of commercially available silver paste, the raw material cost is only 1 / 100 of that of the silver paste, and the application range is wide. And the method adapts to the existing silicon-based battery process, and can realize commercialized large-scale mass production.

This invention discloses an internally threaded steel pipe, its processing technology, and processing device. The internally threaded steel pipe includes a stainless steel inner tube (1), which is formed by rolling stainless steel strip. The inner wall of the stainless steel inner tube (1) is provided with thread teeth (2). The number of thread teeth (2) is multiple and they are distributed in a ring along the inner wall of the stainless steel inner tube (1). A thread groove is formed between adjacent thread teeth (2). This invention can reduce the production cost of internally threaded pipes for air conditioners and improve their service life.

This invention discloses a method and application for treating moldy corn to synthesize polyhydroxy fatty acids (PHA) using a compound enzyme preparation, relating to the fields of fermentation engineering and waste resource utilization technology. The method for treating moldy corn to synthesize PHA using a compound enzyme preparation includes the following steps: 1) screening and culturing highly efficient halophilic bacteria as inoculum strains for open-enzyme PHA synthesis; 2) pretreating moldy corn with a compound enzyme preparation composed of α-amylase, β-amylase, and glucoamylase; 3) using the moldy corn hydrolysate as a fermentation carbon source, inoculating with PHA-producing halophilic bacteria for open-enzyme fermentation. This invention constructs a complete process system of specific halophilic bacteria screening – moldy corn enzymatic pretreatment – ​​open-enzyme fermentation to synthesize PHA, realizing the resource utilization and high-value utilization of moldy corn. Compared with existing technologies, it has significant economic, environmental, and industrial value, with outstanding comprehensive beneficial effects.

The invention discloses a method for preparing hectorite nano-powder through in-situ stripping of a synthetic hectorite reaction liquid, and belongs to the technical field of nano-powder preparation. The method aims at solving the problems that in the prior art, the technological process for preparing hectorite nanosheets is complex, the stripping efficiency is low, the product uniformity is poor, and continuous production is difficult. According to the technical scheme, the preparation method comprises the following steps: after a hydrothermal synthesis reaction of hectorite is completed, naturally cooling a reaction solution, and aging at room temperature for 24 hours; diluting with water until the mass concentration of hectorite is 1-10wt%; the diluent is directly subjected to high-pressure homogenization treatment under the pressure of 10-100 MPa without drying, and interlayer in-situ efficient stripping is achieved through generated shearing, impacting and cavitation effects; then carrying out filter pressing and washing on the homogenized liquid until the conductivity of the discharged liquid is lower than 5S / cm; and finally, strongly drying under the conditions that the temperature is 90-130 DEG C and the grading frequency is 5-25 Hz, so as to obtain the delaminated hectorite nano powder with the water content of less than or equal to 2.0%. Through an integrated strategy of synthesis, in-situ stripping and continuous treatment, the traditional drying and re-dispersing steps are omitted, the technological process is remarkably simplified, the energy consumption is reduced, and the stripping effect is remarkable.

The application relates to a chiral triazole-oxazoline compound and a preparation method and application thereof, and belongs to the technical field of organic synthesis. The chiral triazole-oxazoline compound has the structural formula: the preparation method comprises the steps of click reaction, triazole N2 substitution reaction, Suzuki coupling, triazole ester hydrolysis, amidation with a chiral amine alcohol and dehydration condensation. After a chiral triazole-oxazoline compound and a palladium salt compound are added to generate a catalyst in situ, asymmetric addition of aryl boronic acid on a carbon-carbon double bond of a prochiral organic compound is carried out to prepare a chiral organic compound. The application has the advantages of low raw material cost, few synthesis steps, low experiment site requirement, relatively mild reaction conditions and simple operation for preparing the novel triazole-oxazoline compound.