11979 results about "Methanol" patented technology

The present invention discloses a method for detecting and applying C1-C2-alkyl-substituted phenol isomers, which relates to the technical field of environmental detection and includes: selecting a corresponding sample pretreatment process to prepare a test sample according to the petroleum content range in the sample; under a mobile phase of methanol-5.0-6.5 mmol / L ammonia water, using LC-MS to detect the test sample to obtain the concentration of the first component and the standardized concentrations of co-eluted 3,5-dimethylphenol and 2,6-dimethylphenol; under a mobile phase of acetonitrile-4.0-10.0 mmol / L ammonia water, using LC-MS to detect the test sample to obtain the concentration of 3,5-dimethylphenol, or the standardized concentrations of co-eluted 3,5-methylphenol and 3-ethylphenol, or the standardized concentrations of co-eluted 2,6-dimethylphenol and 2,4-dimethylphenol; under a mobile phase of methanol-5.0-6.5 mmol / L ammonia water or acetonitrile-4.0-10.0 mmol / L ammonia water, using LC-MS to separately detect the calibration samples of the co-eluted components, and calculate the conversion factor of the co-eluted components and the concentration of the other component. The present invention realizes the accurate quantification of phenol and 12 C1-C2-alkyl-substituted phenol isomers.

The present invention discloses a characterization method and application of C0-C2-alkyl-substituted phenols, relating to the technical field of environmental detection. The method includes: selecting a corresponding sample pretreatment process to prepare a test sample according to the petroleum content range in the sample; detecting the test sample by LC-MS under a mobile phase system of methanol-5.0-6.5 mmol / L ammonia water to obtain the concentration of the first component and the normalized concentrations of co-eluted 3,5-dimethylphenol and 2,6-dimethylphenol; detecting the test sample by LC-MS under a mobile phase system of methanol-7.0-11.5 mmol / L ammonia water to obtain the concentration of 3,5-dimethylphenol; detecting calibration samples of 3,5-dimethylphenol and 2,6-dimethylphenol respectively by LC-MS under a mobile phase system of methanol-5.0-6.5 mmol / L ammonia water, calculating a conversion factor, and obtaining the concentration of 2,6-dimethylphenol; and obtaining the contents of 13 single components of C0-C2-alkyl-substituted phenols based on the concentrations of the first component, 3,5-dimethylphenol and 2,6-dimethylphenol. The present invention realizes the quantitative characterization of 13 single components of C0-C2-alkyl-substituted phenols.

The invention discloses a cobalt-loaded covalent organic framework material as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The cobalt-loaded covalent organic framework material is prepared by taking a carbonized covalent organic framework as a matrix and cobalt nitrate hexahydrate as a cobalt source, reducing by using a sodium borohydride methanol solution, and introducing transition metal cobalt into the framework through room-temperature impregnation and thermal reduction processes. In the material, active components comprise Co0 and Co < 2 + > which are uniformly distributed on a carrier. Moreover, the metal cobalt is stably loaded in a carbon skeleton through the bonding effect of heteroatoms such as nitrogen and carbon, so that the stability, the catalytic activity and the durability of the metal cobalt are effectively improved, the dissolution risk of the metal cobalt is reduced, the hidden danger of environmental pollution is reduced, and efficient catalytic activity is shown in the aspect of catalyzing and activating peroxymonosulfate to degrade organic pollutants; and good recycling stability is achieved.

The invention discloses a preparation method of a CuZnAlGa hydrotalcite-like derivative catalyst for preparing methanol from synthesis gas rich in carbon dioxide. Cu metal salt, Zn metal salt, Al metal salt and Ga metal salt are used as precursors, Na2CO3 and NaOH are used as precipitants, a mixed alcohol-water solution is used as an auxiliary solvent for coprecipitation, constant temperature and pH value are controlled, and a hydrotalcite-like structure catalyst precursor is obtained. And the precursor is subjected to high-temperature roasting and in-situ reduction in the hydrogen atmosphere, and then the layered framework structure with the Cu nano-particles fixed by the oxide is obtained. The hydrotalcite-like structure plays a role in crystal lattice confinement to prevent Cu particle aggregation, and the interaction between Cu and the oxide improves the adsorption capacity of the surface of the catalyst to CO and CO2, and enhances the activity and stability of methanol prepared from carbon dioxide-rich synthesis gas.

The invention relates to the technical field of methanol safety monitoring, in particular to a methanol leakage prediction system based on artificial intelligence. According to the method, structural extraction of potential leakage paths is realized through dynamic sorting and surge correlation combination of methanol concentration change trends in continuous time periods, and weighted calculation is carried out on conduction characteristics between monitoring nodes in double dimensions of time series and spatial topology by virtue of a graph attention mechanism, so that the detection accuracy of the leakage paths is improved. The method comprises the following steps: establishing a path, forming quantitative expression of node influence factors in the path, capturing synchronous abnormal behaviors under an environment disturbance background through a multi-parameter coupling sudden change identification mode of air pressure and wind speed, further constructing a high-timeliness sudden change event set, and performing index fusion on the influence degree and sudden change frequency of monitoring nodes on the basis to obtain a high-timeliness sudden change event set. And space risk score distribution is formed, and a leakage possibility region prediction map is generated in combination with two-dimensional coordinates, so that boundary fine depiction of a high-risk region is realized.

The invention belongs to the technical field of PET (Polyethylene Terephthalate) recovery, and particularly relates to a method for assisting methanol alcoholysis of waste PET by using an ester solvent. The method comprises the following steps: by taking waste PET as a raw material, methanol as a solvent and an ester solvent as a cosolvent, catalyzing and depolymerizing the waste PET under the action of an organic strong alkali catalyst to obtain an alcoholysis product, and further separating and purifying the alcoholysis product to obtain DMT and high-value byproducts. The method is mild in reaction condition and rapid in reaction process, the catalyst does not contain metal, and the subsequent purification process can be simplified.

The invention relates to the technical field of water treatment, in particular to a denitrification slow-release composite carbon source as well as a preparation method and application thereof. Comprising the following components in percentage by weight: 2-10% of hydroxy acrylic acid, 2-10% of saccharides, 5-15% of straw waste liquid, 5-15% of kitchen waste liquid, 2-10% of saccharides, 3-15% of porous volcanic ash, 5-15% of polyvinyl alcohol, 0.2-1% of inorganic salt, 1-2% of polypeptide, 0.5-1% of growth factors, 0.2-1.5% of MFC agar, 0.1-0.5% of cellulase, 0.1-0.5% of protease, 0.1-0.5% of denitrifying bacteria and the balance of water. The sum of the percentages of the raw materials is 100%. The invention has the advantages that: each nutrient component is balanced, the nutrition is comprehensive, the activity of denitrifying bacteria is improved, the number of species and community layers of a biological system of a sewage treatment plant are increased, the growth of various microorganisms is facilitated, nutrient substances can be fully utilized, and the denitrification effect is far higher than that of related carbon sources such as single methanol, glucose and the like.

The invention discloses a device and a method for producing oxamide, and relates to the field of chemical production. The method for producing oxamide specifically comprises the following steps: mixing a methanol solution of liquid ammonia and a methanol solution of dimethyl oxalate, carrying out ammonolysis reaction, carrying out flash evaporation, filtration and drying on first slurry obtained after the reaction is finished to obtain solid oxamide, and refining a liquid phase obtained by solid-liquid separation of the first slurry to obtain a byproduct methanol, ammonia in the tail gas is washed and absorbed by dimethyl oxalate and then returns to a reaction system. In the oxamide production process, dimethyl oxalate reacts with ammonia gas in mixed gas generated in the reaction process, and the obtained product is continuously subjected to subsequent ammonolysis reaction, so that the utilization rate of reaction materials is increased; meanwhile, a condenser is not used for condensing ammonia gas and methanol and then separating alcohol and ammonia, so that condensing equipment and cooling water are saved, the production cost is reduced, and industrial production is facilitated.

The invention discloses a process and a device for producing oxamide, and relates to the field of chemical production. The invention provides a process for producing oxamide, which specifically comprises the following steps: mixing a methanol solution of liquid ammonia and a methanol solution of dimethyl oxalate, carrying out ammonolysis reaction, carrying out flash evaporation, filtration and drying on first slurry after the reaction is finished to obtain solid oxamide, and carrying out liquid phase refining to obtain a byproduct methanol, ammonia in the tail gas is washed and absorbed by dimethyl oxalate and then returns to a reaction system. The methanol solution of dimethyl oxalate is used for absorbing excessive ammonia in the reaction process, and the reaction product is continuously used for producing oxamide, so that methanol and ammonia can be thoroughly separated, the conversion rate of ammonia can be greatly improved, and the economical efficiency of the production process is improved; meanwhile, tail gas containing ammonia is not discharged, and the environmental protection property of the production process is improved.

The invention discloses a methanol generator flywheel assembling device and method, and relates to the technical field of generator flywheel assembling. The flywheel assembling device comprises a lifting seat, a clamping seat is mounted at the top of the lifting seat, a first oil tank is mounted below the outer side of the clamping seat, a clamping assembly is mounted at the top of a piston rod in the first oil tank, a first corrugated pipe and a second corrugated pipe are connected to the bottom of the first oil tank, and a hammering seat is mounted at the top of the lifting seat. A hammering block is longitudinally and slidably installed on the side edge of the top of the hammering base, a telescopic connecting rod is rotatably installed at the center position of the bottom of the hammering block, the bottom end of the telescopic connecting rod is rotatably connected with the bottom of the hammering base, a hammering assembly is installed on the side wall of the hammering base, and a moving assembly is installed on the inner wall of the bottom of the hammering base. A traditional manual hammering flywheel installation mode is replaced, the flywheel installation efficiency is improved, the labor cost is reduced, and the labor intensity of workers is relieved.

Provided is a laminate capable of electrolyzing an oxygen compound gas represented by CO2 with high conversion efficiency and suppressing deterioration in electrolytic performance. In this laminate having a structure in which an electrolyte layer is sandwiched between an anode catalyst layer and a cathode catalyst layer, a perovskite oxide and CuFe2O4 are contained in the cathode catalyst layer, and the content of CuFe2O4 in the cathode catalyst layer is at least 10 mass%.

The invention provides a preparation method of a UTSA-16 structure metal organic framework, which comprises the following steps: sequentially adding a metal salt and potassium citrate into an auxiliary solvent, adding an alkaline solution, dissolving, and treating in a ball milling manner to obtain a reaction solution; centrifuging the reaction liquid, collecting a solid part, washing with diethyl ether, soaking with methanol, and drying to obtain a precursor; and activating the precursor at the temperature of 80-90 DEG C, and removing the solvent in the pore channels to obtain the metal organic framework with the UTSA-16 structure. According to the invention, the UTSA-16 is prepared by a solvent-assisted ball milling method, the problems of high energy consumption, long time and serious pollution in the previous preparation process of the UTSA-16 are solved, and the UTSA-16 can be formed under a milder condition and within a shorter time by the method; the reaction is carried out in a ball mill, the maximum synthesis amount can be enlarged along with the scale of the ball mill, the reaction takes 3 hours, heating is not needed, and the method can be put into factories for large-scale production.

The present application discloses a recombinant bacterium for producing D-psicose by fermentation and a preparation method thereof, and belongs to the field of food chemical industry. The technical problem to be solved by the present application is: how to obtain a recombinant bacterium that uses methanol as a raw material for bacterial growth and glucose as a raw material to synthesize D-psicose. By subjecting the recipient bacteria to a purposeful transformation, the microbial strain is provided with the ability to accumulate microbial biomass using methanol and synthesize D-psicose using D-glucose, while preventing the use of D-glucose for microbial growth so that D-glucose is completely converted into D-psicose, thereby improving substrate utilization efficiency. The recombinant polymorphic Hansen yeast provided in the present application can realize the use of methanol and other compounds as raw materials for microbial growth, and after the microbial growth reaches a certain biomass, D-psicose is synthesized using D-glucose as a raw material. And then establish a corresponding technical route for synthesizing D-psicose.

The invention discloses a method for simultaneously detecting ergothioneine, ergosterol, ergosterol peroxide and lentinine in lentinus edodes, and belongs to the technical field of measurement of active ingredients of the lentinus edodes. The method comprises the following steps: detecting a shiitake mushroom extracting solution by adopting an ultra-high performance liquid chromatography-tandem mass spectrometry mode, wherein a chromatographic column is an HILIC or C18 chromatographic column; the mobile phase A and the mobile phase B are an aqueous solution containing formic acid and a methanol or acetonitrile solution containing formic acid respectively; the mass spectrum conditions comprise an electrospray ionization source; a positive ion multiple reaction monitoring mode; the ion spraying temperature is 315-325 DEG C; the temperature of the ion transmission tube is 320-330 DEG C; and the ion spraying voltage is 3500 V to 3700 V. The method has the characteristics of high sensitivity, high selectivity and high accuracy, and is suitable for quantitative detection of ergothioneine, lentinine, ergosterol peroxide and ergosterol compounds in shiitake mushrooms.

According to the supercritical CO2 circulation and water electrolysis hydrogen production coupled alcohol-electricity co-production system and method, water in an electrolytic bath is electrolyzed through wind and light abandoned electricity, and oxygen and hydrogen are generated. Oxygen and coal are subjected to pure oxygen gasification in a gasification furnace, and generated gasified gases (mainly including methane CH4, hydrogen H2 and carbon monoxide CO) are subjected to direct-fired supercritical CO2 circulation for power generation. Waste gas exhausted by the turbine is subjected to heat recovery through the heat regenerator, water is condensed in the condenser, and remaining CO2 is fed into the gas tank to be stored. One part of CO2 is pressurized by a compressor and then is fed into the combustion chamber through a heat regenerator, and the other part of CO2 and H2 are catalyzed to synthesize methane. According to the system, wind and light abandoned electricity can be converted into hydrogen energy to be stored, efficient clean power generation of coal and synthesis of green methanol are achieved through direct-fired supercritical CO2 circulation, and the green methanol / electricity co-production system with zero carbon emission is formed.

The invention relates to a preparation method of a catalyst for synthesizing 2, 6-dimethylphenol, which comprises the following steps: mixing ferric salt, aluminum salt, magnesium salt, an acidic material and water to obtain a solution A; mixing sodium silicate, a template agent and water to obtain a solution B; mixing the solution A and the solution B, aging, crystallizing, filtering, drying and calcining to obtain a catalyst precursor I; mixing with an alkaline solution, and filtering to obtain a catalyst precursor II; then mixing with an acidic solution, filtering to obtain a solid, and then washing and calcining to obtain a catalyst; the preparation method of the 2, 6-dimethylphenol comprises the following step of preparing the 2, 6-dimethylphenol by taking methanol, phenol, water and benzoic acid as raw materials in the presence of the catalyst. The catalyst provided by the invention has good catalytic activity, reduces the problem of carbon deposition, and has good selectivity and high phenol conversion rate when being used for preparing 2, 6-dimethylphenol.

The invention discloses a polytetrafluoroethylene film with high tensile strength and a preparation process thereof, and relates to the technical field of polytetrafluoroethylene films. The preparation method comprises the following steps: step 1, preparing a composite raw material: S1-1, sequentially putting a tetrafluoroethylene copolymer into acetone and methanol to be soaked, washed and dried; dispersing in a glycidyl methacrylate-methanol solution, and carrying out irradiation grafting in a nitrogen atmosphere; filtering, washing and drying to obtain an epoxy tetrafluoroethylene copolymer; s1-2, sequentially putting an epoxy tetrafluoroethylene copolymer and a composite filler into tetrahydrofuran, stirring for 24-48 hours at the temperature of 70-75 DEG C in a nitrogen atmosphere, filtering, washing and drying to obtain a composite raw material; 2, mixing polytetrafluoroethylene, the composite raw material and carboxylated polyphenylene sulfide to obtain a mixture; performing cold press molding and temperature-controlled sintering to obtain a basic film; 3, the basic film is subjected to turning forming and continuous rolling, and the polytetrafluoroethylene film is obtained.

The invention discloses a metal oxide modified high-entropy alloy catalyst and a preparation method and application thereof, the metal oxide modified high-entropy alloy catalyst is a supported Ni-Ga-Cu-In-Zn-Fe high-entropy alloy catalyst with a mixed metal oxide of X, Mg and Al as a carrier, the metal X is Zr or Ce, preferably Zr; the catalyst is prepared through a one-step precipitation method, a co-precipitation and impregnation method or a two-step precipitation method by utilizing the characteristic that main body laminate composition and elements of a layered hydroxide (LDHs) material are adjustable; the metal oxide modified high-entropy alloy catalyst has the characteristics of high catalyst metal particle dispersity, high catalytic activity, good selectivity and long service life due to the introduction of ZrO2 or CeO2, and can reach a higher CO2 conversion rate in a relatively low temperature interval, so that the CO2 conversion rate and the single-pass yield of methanol are remarkably improved, and the catalyst has the advantages of low cost and high efficiency. Therefore, the utilization efficiency of carbon resources is improved, and the method has a good industrial application prospect.

The invention discloses a method for catalytically oxidizing lignin to depolymerize into an aviation oil intermediate by using a cellulose carbon aerogel supported copper nano-catalyst. Comprising the following steps: (1) dissolving cellulose powder into a mixed alkali solution of NaOH and urea, and stirring at low temperature to obtain a clear and transparent cellulose solution; and washing to be neutral to obtain well dispersed cellulose suspension. And (2) carrying out suction filtration molding, and freeze-drying for a period of time to obtain the cellulose aerogel. And (3) immersing in an ethanol solution of copper nitrate for ultrasonic treatment, and drying in a vacuum drying oven. And (4) carrying out high-temperature calcination in an N2 atmosphere to obtain a catalyst which is marked as Cu / CA. And (5) the catalyst can efficiently catalyze a Fenton-like reaction to oxidize a dimer model compound of lignin in acidic, neutral and alkaline environments to obtain products including benzoic acid, acetophenone, benzyl alcohol, phenol and the like, the required hydrogen peroxide concentration is low, and the catalyst has the advantages of simple process, high catalytic activity, low cost and the like, can be used for effectively degrading lignin to prepare aviation oil intermediates, and has wide application prospects. And repeated cyclic utilization is realized.

The invention relates to the technical field of methanol production, and discloses an efficient gas-liquid distribution device for a methanol synthesis reaction tower. The liquid distribution assembly is used for distributing a catalyst; the filler assembly is used for promoting gas-liquid contact; when the liquid distribution assembly runs, the liquid distribution assembly drives the atomization assembly to atomize the catalyst flowing on the inner wall of the tank body; the liquid distribution assembly comprises a rotating shaft, the rotating shaft is rotationally installed in the tank body, a wind wheel is fixedly connected to the rotating shaft, a liquid disc is fixedly connected to the top end of the rotating shaft, a plurality of first spray heads are hinged to the liquid disc, and hoses are arranged between the first spray heads and the liquid disc. Through the arrangement of the liquid distribution assembly, the multiple first spray heads can swing in a reciprocating mode in the rotating process, so that the spraying range of the first spray heads is expanded, the situation that spraying blind areas occur in the tank body is avoided, catalysts in the tank body are distributed more evenly, and the gas-liquid contact efficiency is improved.

The invention discloses a control method for improving the cold starting performance of a methanol extended-range hybrid power system, relates to the field of engine control, and solves the technical problem that the existing methanol engine starting mode has limited effects on the thermal atmosphere of methanol atomization, premixing and methanol injection ignition success under the low-temperature condition. The method comprises the steps that an engine starting success condition is set, the real-time environment temperature is obtained, when the real-time environment temperature is larger than the preset first starting temperature, a first starting strategy is adopted to start an engine, and whether the engine is started successfully or not is judged according to the engine starting success condition. The invention further discloses a system for improving the cold start performance of the methanol extended-range hybrid power system. Methanol atomization is promoted, methanol is fully premixed, and the successful thermal atmosphere effect and success rate of a methanol injection point are improved.

The invention relates to the technical field of preparation of catalysts, in particular to a catalyst for in-situ capture of carbon dioxide, a preparation method of the catalyst and application of the catalyst to preparation of methanol from methane, and the preparation method comprises the following steps: S1, mixing and stirring Bi (NO3) 3.5 H2O, dilute nitric acid and an adsorption modifier; s2, filtering to obtain a white precipitate, drying, slowly heating to 450 DEG C in a muffle furnace, and keeping the temperature for 20-30 minutes to obtain a faint yellow solid; s3, dispersing in a modified dissolving solution, sealing the reactor, and purging with argon for 10-15 minutes; and S4, injecting CH4, reacting for 2 hours under the irradiation of a xenon lamp, washing a solid obtained by suction filtration with deionized water, and drying at 60 DEG C for 10-12 hours to obtain the high-performance catalyst. The invention aims at the field of preparation of high-value chemicals from photocatalytic methane, solves the problem of generation of carbon dioxide by peroxidation of methane, and captures the peroxidation product carbon dioxide through the cooperation of the adsorption modifier and the modified dissolving solution to inhibit peroxidation of methane.

The invention discloses a preparation method and application of a metal nitrogen-carbon loaded high-load platinum catalyst, and belongs to the field of four-electron oxygen reduction. The method comprises the following steps: firstly, dispersing a synthesized metal carrier in ethylene glycol, carrying out uniform ultrasonic treatment, dropwise adding a chloroplatinic acid solution, continuously carrying out uniform ultrasonic dispersion, dropwise adding sodium hydroxide until the pH value is 11, and stirring for 2 hours; reacting the reaction liquid in an oil bath at 125 DEG C for 3 hours, cooling to room temperature, adding hydrochloric acid to settle the reaction liquid, washing with a large amount of water, and drying in vacuum to obtain the target catalyst. According to the synthesis method, relatively environment-friendly solvents such as methanol and ethylene glycol are used, so that the pollution to the environment is reduced, the used raw materials are relatively cheap, the energy consumption in the preparation process is relatively low, and the production cost of the catalyst is favorably reduced. The prepared catalyst shows excellent oxygen reduction performance and has a good industrial prospect.

The invention relates to a preparation method and application of a porous material for preparing methanol through carbon dioxide adsorption and conversion. When the material is prepared, firstly, 4, 4 '4' '-(1, 3, 5-triazine-2, 4, 6-trimethylene) triphenylamine and 1, 2-acenaphthequinone are treated in a mixed solvent containing dioxane / acetonitrile / 6M acetic acid, and AT-COF is obtained; further synthesizing by adopting an impregnation method to obtain IrRu-COF; and finally, uniformly mixing the active gamma-aluminum oxide and the IrRu-COF material to form a carrier dispersion liquid, and then carrying out PEI loading, vacuum impregnation, washing and drying to obtain the PEI functionalized gamma-Al2O3 / COF composite catalyst. The technical closed loop from low-concentration CO2 capture to solar driven conversion is realized, the process flow is simple, and the energy consumption is low.

The invention discloses a low-temperature methanol washing RTO tail gas treatment device adopting a self-circulation air cooling double-valve-plate butterfly valve, and relates to the technical field of waste gas treatment. By arranging the condensation impurity removal mechanism, when coal waste gas passes through one condensation assembly, low-temperature tail gas cleaned by the low-temperature methanol washing mechanism can flow through a plurality of heat exchange pipes in the condensation assembly at the same time, so that the temperature of the outer walls of the heat exchange pipes is rapidly reduced to be below zero DEG C; coal tar gas and water vapor flowing through the low-temperature heat exchange pipe can be quickly cooled and solidified after being in contact with the outer wall of the low-temperature heat exchange pipe, so that the effect of separating the coal tar gas and the water vapor from the tail gas is achieved; a cold source which cannot be utilized and can influence subsequent RTO furnace treatment in the part of tail gas is ingeniously used for separating energy of coal tar and water vapor in the waste gas, a refrigerating device does not need to be independently arranged in the cooling and condensing process of the coal tar and the water vapor, and the purposes of energy conservation and emission reduction are achieved.

The invention relates to the technical field of drug analysis and detection, and provides a detection method of moxifloxacin hydrochloride related substances. The related substances of moxifloxacin hydrochloride are detected by adopting a high performance liquid chromatography method, and the detection conditions are as follows: octadecylsilane chemically bonded silica is taken as a filling agent of a chromatographic column; the wavelength of a UV detector is 296 nm; the column temperature is 35-45 DEG C; the flow velocity of the mobile phase is 1.6-1.8 ml / min; the sample injection volume is 10-50 [mu] l; the mobile phase A is phosphate buffer solution-acetonitrile-methanol; the mobile phase B is phosphate buffer solution-acetonitrile-methanol; the elution mode is gradient elution; the diluent is a mobile phase A; according to the method provided by the invention, effective separation between moxifloxacin hydrochloride and various impurities can be realized, the sensitivity is high, the accuracy is good, the reproducibility is relatively good, a good linear relation is shown in a certain range, and qualitative and quantitative determination can be carried out on various impurities in moxifloxacin hydrochloride bulk drugs.

The invention relates to a catalyst for synthesizing ortho-cresol as well as a preparation method and application of the catalyst. The molar ratio of Zn element to Al element in the metal spinel catalyst ZnAl2O4 is 1: (0.25-16), and the preparation method comprises the following steps: uniformly mixing aluminum nitrate nonahydrate and zinc nitrate hexahydrate in deionized water, stirring, adding a precipitator, and adjusting the pH value of the solution to form a precipitate dispersion liquid; and aging the precipitate dispersion liquid, carrying out suction filtration on the suspension liquid, washing, drying, and calcining to obtain the catalyst. Compared with the prior art, the catalyst disclosed by the invention is high in activity, simple to prepare, non-toxic, good in stability, long in service life, suitable for synthesizing o-cresol and 2, 6-xylenol through reaction of phenol and methanol, good in ortho-selectivity and few in by-products.

The invention discloses a rare earth boride nano material as well as a preparation method and application thereof. The phase state of the rare earth boride nano material is REB6 or REB4; the preparation method comprises the following steps: S1, respectively weighing a compound raw material containing an RE element and a compound raw material containing a B element; s2, adding an additive, and fully grinding; s3, reacting under the protection of inert gas; s4, after the reaction is finished, excessive methanol is added, centrifugal separation is performed after no bubbles emerge, and a precipitate A is reserved; s5, adding diluted hydrochloric acid for soaking, and performing centrifugal separation again to reserve a precipitate B; and S6, washing the precipitate B with deionized water, and drying to obtain the rare earth boride nano material. According to the preparation method disclosed by the invention, a normal-pressure and low-temperature preparation method is adopted, the pure-phase rare earth hexaboride nanocrystal can be obtained at normal pressure and the temperature as low as 300 DEG C, and no active metal elementary substance needs to be introduced in the preparation process.

The invention relates to the technical field of biological fermentation, in particular to a methanol-induced fermentation process for expressing III type recombinant human collagen, which comprises the following steps: inoculating a pichia pastoris fermentation seed solution into a fermentation culture medium, performing fermentation culture to a glycerol culture stage, and entering a methanol-induced culture stage after glycerol feeding is finished and pH is rebounded. According to the methanol-induced fermentation process for expressing the III-type recombinant human collagen, provided by the invention, after the glycerol feeding is finished, the pH rebound is taken as an index, and methanol induction is started after the pH rebound, so that thallus growth is obviously accelerated, and the protein expression quantity is improved, and therefore, the III-type recombinant human collagen can be industrially produced; and greater economic values can be created for enterprises.

The invention provides a carbon quantum dot-ferric oxide nano composite material as well as a preparation method and application thereof. The composite material is prepared by the following steps: S1, mixing a ferrous sulfate solution with an imidazole methanol solution, and performing ultrasonic treatment to obtain a zeolite imidazate skeleton structure material containing an iron core; s2, calcining the zeolite imidazate skeleton structure material in an environment with a temperature range of 200-700 DEG C and oxygen partial pressure of 5-40% to obtain iron oxide with a complex frame structure; s3, synthesizing graphene carbon quantum dots with the size of 5-8 nm by adopting a trinitrophenol method; s4, the carbon quantum dots and ferric oxide powder are mixed and then evenly ground in a ball mill, the ball milling time is 60-240 min, the content of the added graphene carbon quantum dots is 0.5-3 wt%, and a carbon quantum dot-ferric oxide nanocomposite is obtained; according to the method, ferric oxide with a complex framework is compounded with the graphene carbon quantum dots, so that indoor VOCs can be oxidized at room temperature.