1448 results about "Cyclohexanes" patented technology

The invention provides a method for synthesizing adiponitrile through selective ammoxidation of cyclohexene oxide. The invention aims to simulate and optimize the process of synthesizing adiponitrile from cyclohexene oxide by a one-step direct ammoxidation method to develop a novel multiphase composite metal vanadium-based oxide catalyst, the composition of the catalyst is CoaVbPcModMNOx / TiO2, the active elements of the catalyst comprise vanadium element V, cobalt element Co, phosphorus element P and molybdenum element Mo, M is an auxiliary metal element (Mn, Cr, Fe or Ni), and N is an alkali metal (Na, K or Cs); the value range of a is 0.2 to 1.2; the value range of b is 0.8 to 1.5; the value range of c is 0.1 to 0.23; the value range of d is 0.07 to 0.35; x is the oxygen atom proportion required by the metal oxidation valence state. The catalyst has the advantages of simple preparation, good cycling stability, high yield and the like. The yield and the product purity of the adiponitrile are improved, the energy consumption in the production process of the adiponitrile is reduced, and the breakthrough of the production technology of the adiponitrile is realized.

The invention discloses a method for synthesizing deuterated olefin under catalysis of a palladium membrane by taking D2O as a deuterium source, and belongs to the technical field of synthesis of deuterated olefin building blocks. According to the method, a three-chamber electrolytic tank separated by a palladium membrane and an ion exchange membrane is used as a reactor, the palladium membrane is used as a working electrode, an electrolyte deuterium aqueous solution is used as an electrolyte, deuterium water is electrolyzed through a constant-potential electrolysis method, and formed active deuterium is transmitted to one side of an organic reaction taking absolute ethyl alcohol or cyclohexane as an organic solvent; and catalyzing an alkyne compound by using a palladium membrane modified by sodium thiophenol to perform reduction deuterization so as to synthesize a deuterated olefin compound with high selectivity, and further synthesizing a corresponding deuterated drug. The invention provides a green, efficient, high-universality and low-cost amplification synthesis method for synthesizing a deuterated olefin building block containing a functional group easy to reduce and hydrolyze, and the method has a wide application prospect.

The present disclosure relates to an improved, efficient, scalable process to prepare intermediate compounds, such as 2,2′,2″-(1,3,5,2,4,6-trioxatriborinane-2,4,6-triyl)tris(3-fluorophenol), useful for the synthesis of compounds, such as Compound 9, for the treatment of KRAS G12C mutated cancers.

The invention discloses a pure silicon Beta molecular sieve packaging metal catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: dissolving a silicon source, a template agent, a ligand, a metal salt and a mineralizer in water, carrying out a crystallization reaction at 120-200 DEG C, and carrying out calcination treatment and reduction treatment on the crystallized solid to obtain the pure silicon Beta molecular sieve packaging metal catalyst. The pure silicon Beta molecular sieve packaged metal catalyst is obtained. The pure silicon twelve-membered ring macroporous Beta molecular sieve encapsulated metal catalyst is prepared through a ligand protection in-situ hydrothermal synthesis strategy, so that the size of a metal nanocluster can be reduced, the high-temperature thermal stability of the metal nanocluster is improved, the adsorption and diffusion processes of guest molecules can be regulated and controlled, and the stability of the metal nanocluster is improved. Furthermore, the catalyst shows excellent catalytic performance when being used for catalyzing a propane dehydrogenation reaction and a methyl cyclohexane dehydrogenation reaction, and efficient and stable propane and methyl cyclohexane dehydrogenation performance is achieved.

The invention relates to the technical field of nano materials, and particularly discloses a preparation method of surface modified nano calcium carbonate for a battery diaphragm coating. According to the method, the technical paths of microemulsion confinement crystal form regulation and control, gradient surface modification and boehmite compounding and porosity regulation and control are fused, and the functional nano calcium carbonate adaptive to the battery diaphragm coating is prepared. According to the technical scheme, limestone is used as a raw material, after calcination and digestion, the particle size of nano calcium carbonate is controlled through microemulsion carbonization (a cyclohexane-span 80-n-butyl alcohol system); a silane coupling agent KH560-KH570 is adopted for gradient modification to introduce an electrophilic functional group, boehmite is compounded to form a composite coating, and the porosity is regulated and controlled by adjusting the solid content in coating slurry and the coating speed. The method is stable in process and high in compatibility, and meets the requirements of diaphragm coatings of lithium ion batteries and solid-state batteries.

An advantageous isolated morphic form of trilaciclib which is 2′-((5-(4-methylpiperazin-1-yl)pyridin-2-yl)amino)-7′,8′-dihydro-6′H-spiro[cyclohexane-1,9′-pyrazino[1′,2′:1,5]pyrrolo[2,3-d]pyrimidin]-6′-one, for example in the form of a dihydrochloride salt or a dihydrochloride, dihydrate.

An advantageous isolated morphic form of trilaciclib which is 2′-((5-(4-methylpiperazin-1-yl)pyridin-2-yl)amino)-7′,8′-dihydro-6′H-spiro[cyclohexane-1,9′-pyrazino[1′,2′:1,5]pyrrolo[2,3-d]pyrimidin]-6′-one, for example in the form of a dihydrochloride salt or a dihydrochloride, dihydrate.

An advantageous isolated morphic form of trilaciclib which is 2′-((5-(4-methylpiperazin-1-yl)pyridin-2-yl)amino)-7′,8′-dihydro-6′H-spiro[cyclohexane-1,9′-pyrazino[1′,2′:1,5]pyrrolo[2,3-d]pyrimidin]-6′-one, for example in the form of a dihydrochloride salt or a dihydrochloride, dihydrate.

The invention relates to the technical field of multi-layer copolyester films, and discloses a high-temperature-resistant antistatic multi-layer copolyester film and a preparation method and application thereof, and the multi-layer copolyester film comprises an ABA three-layer structure obtained through melt co-extrusion; the layer A is prepared from the following raw materials in percentage by mass: 5 to 30 percent of anti-blocking agent master batch and the balance of modified copolyester; the raw material of the layer B is modified copolyester; the modified copolyester is prepared from a binary acid mixture, a dihydric alcohol mixture and a catalyst through an esterification reaction and a condensation polymerization reaction; the binary acid mixture comprises furandicarboxylic acid and 2, 2 '-bifuran-5, 5'-dicarboxylic acid, and the dihydric alcohol mixture comprises ethylene glycol, 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol and 1, 4-cyclohexanedimethanol. According to the invention, the modified copolyester is used as a main raw material, and the film is endowed with good temperature resistance in a copolymerization modification manner, and has stable and lasting antistatic performance.

The invention belongs to the field of functional materials and surface engineering, and particularly relates to ant-cave-shaped photo-thermal super-hydrophobic sponge and a preparation method and application thereof.The preparation method comprises the steps that melamine sponge is soaked in an absolute ethyl alcohol solution to be repeatedly soaked and then dried; adding dopamine hydrochloride into the tris buffer solution, stirring to obtain a mixed solution, immersing the surface of the dried melamine sponge into the mixed solution, and drying to obtain PDA (at) MS; the preparation method comprises the following steps: firstly adding PDMS and a curing agent thereof into a cyclohexane solution, stirring, then adding MWCNTs, MnO2 and CuO, stirring to form a mixed solution, then spraying the mixed solution on the surface of PDA (at) MS, and drying to obtain a PMOS (P-channel Metal Oxide Semiconductor); and immersing the PMOS surface into a mixed solution of ethanol containing PFOTES and deionized water, and then taking out and drying. Through the fine cross-scale multi-layer gap structure design, high mechanical durability and excellent light absorption capacity are achieved, and efficient anti-icing, deicing, interface evaporation and fresh water production in an extreme environment are achieved.

The invention relates to a preparation method of 3-[(1S, 2S)-1-[5-[(4S)-2, 2-dimethyl oxacyclohexane-4-yl]-2-[(4S)-2-(4-fluoro-3, 5-dimethyl phenyl)-3-[3-(4-fluoro-1-methylindazol-5-yl)-2-oxoimidazol-1-yl]-4-methyl-6, 7-dihydro-4H-pyrazolo [4, 3-c] pyridine-5-carbonyl] indol-1-yl]-2-methylcyclopropyl]-4H-1, 2, 3-triazolo [4, 3-c] pyridine-5-carbonyl] indol-1-yl]-2-methylcyclopropyl]-1, 2, 4-triazolo [4, 3-c] pyridine-5- The invention relates to synthesis of 1, 2, 4-oxadiazole-5-one or a salt thereof, and related synthesis intermediate compounds.

The invention discloses an SERS (Surface Enhanced Raman Scattering) detection method for paclitaxel drug concentration in blood of a breast cancer patient, and belongs to the technical field of detection. The method comprises the following steps: performing acetonitrile two-step precipitation centrifugal treatment on a blood sample to obtain a detection sample; the method comprises the following steps: constructing a high-sensitivity SERS substrate (the volume ratio of gold nanoparticles to ethanol is 1: (90-100), and a film is formed on a water-cyclohexane interface) through self-assembly of gold nanoparticles on a liquid-liquid interface; the method comprises the following steps: dropwise adding a sample into a substrate, and detecting characteristic peaks of 1024cm <-1 > and 1053cm <-1 > by using a portable Raman spectrometer (785nm, 30mW, 0.5 s); and calculating the paclitaxel concentration in combination with a pre-established quantitative curve. The method is easy and convenient to operate and suitable for clinical bedside rapid monitoring.

The invention relates to a lignin-based polymer pervaporation membrane, a preparation method thereof and a method for separating and purifying cyclohexane-KA oil. The invention aims to provide a pervaporation membrane which is high in permselectivity, high in stability and good in mechanical property. The pervaporation membrane is used for cyclohexane-KA oil separation and has the advantages of high separation efficiency, low energy consumption and simple process. The preparation method comprises the following steps: adding the surfactant, the polymer and the solvent into a reactor, and stirring at 50-70 DEG C for 4-6 hours to obtain a mixed solution; the method comprises the following steps: adding lignin and a solvent into a reactor, and stirring at room temperature for 4-6 hours to obtain a lignin solution; dropwise adding the lignin solution into the mixed solution, and continuously stirring at constant temperature for 12-24 hours to obtain a membrane casting solution; transferring the membrane casting solution to a centrifugal tube, performing centrifugal separation, and uniformly coating the membrane casting solution on an ultrafiltration membrane material with the membrane thickness of 100-200mm to form a uniform liquid membrane; and drying the liquid membrane to obtain the lignin-based polymer pervaporation membrane. Belongs to the technical field of membrane separation.

The invention discloses a wood-based composite phase-change material and a preparation method thereof, and belongs to the technical field of phase-change materials.The preparation method of the wood-based composite phase-change material comprises the following steps that wood is cut and then added into delignification liquid to be heated, the wood is taken out and washed with water, and delignified wood is obtained; the delignification wood is added into the modification liquid to be heated, and after being taken out, the delignification wood is washed and dried to obtain pretreated wood; mixing polyethylene glycol, citric acid and boric acid, heating and stirring to obtain a phase change material; dipping the pretreated wood into the phase change material for vacuum dipping, taking out and drying to obtain the phase change material. The modified liquid is prepared from an ethanol water solution, a modified filler, 2-(3, 4-cyclohexene oxide) ethyltrimethoxysilane and triethylamine. The delignification liquid and the modification liquid are adopted for pretreating the wood, so that the wood can be better firmly combined with the phase change material, leakage is prevented, and the finally prepared wood-based composite phase change material has excellent heat management capacity and stability.

The invention relates to the technical field of adhesives, in particular to a bio-based adhesive and a preparation method thereof. The bio-based adhesive is prepared from the following raw material components: bio-based polyol, bio-based isocyanate and cyclohexane diisocyanate, a tin catalyst, a chain extender and an organic solvent are not contained; the invention also provides a preparation method of the bio-based adhesive, the bio-based adhesive prepared by the invention has good biodegradability, thermoplasticity and biocompatibility, can realize biodegradation under various environmental conditions, reduces pollution to the environment, and is more environment-friendly in treatment after being discarded compared with traditional petroleum-based polyurethane.

The invention belongs to the technical field of toluene hydrogenation catalysts, and particularly relates to a magnetically separable carbon-supported ruthenium cluster catalyst as well as a preparation method and application thereof. According to the catalyst, a nickel-coated graphene core-shell structure carbon material is used as a carrier, and ruthenium is loaded on a graphene shell layer in a cluster form through a deposition and precipitation method. The catalyst can efficiently catalyze toluene hydrogenation to generate methylcyclohexane under the mild condition of 80-110 DEG C and the hydrogen pressure of 10-30 bar. Compared with a traditional catalyst, the magnetic separable catalyst not only can work under a relatively mild condition, but also can be separated, recycled and reused by externally applying a magnetic field, so that the targets of environmental protection, energy conservation and emission reduction are further achieved.

The invention relates to a laminated film for wafer back grinding and a preparation method thereof, and belongs to the technical field of semiconductors. The laminated film comprises a base material layer, a buffer layer, a UV visbreaking layer and a release layer which are arranged in sequence, the buffer layer comprises first resin, second resin and a catalyst; the first resin is a random copolymer, and the second resin is selected from a block copolymer or a core-shell polymer; the first resin comprises a first hard monomer, a first soft monomer, a first functional monomer, an acrylic block copolymer, a first initiator and a first solvent; the UV visbreaking layer comprises a second hard monomer, a second soft monomer, a second functional monomer, vinyl cyclohexane, a second initiator, a cross-linking agent, a UV monomer and a second solvent. According to the laminated film, the adhesion performance between the buffer layer and the base material layer and between the buffer layer and the UV visbreaking layer is excellent, the layering phenomenon in the grinding process is prevented, the integrity and stability of the laminated film are ensured, the laminated film is suitable for different material surfaces, and the application range of the laminated film is widened.

The invention belongs to a preparation method of a chemical intermediate, and particularly relates to a preparation method of dimethyl 1, 4-cyclohexanedicarboxylate, which comprises the following steps: carrying out hydrogenation reaction on dimethyl p-toluene in a solvent in a hydrogen atmosphere under the catalysis of a cerium dioxide loaded ruthenium monometal catalyst to obtain the dimethyl 1, 4-cyclohexanedicarboxylate, the invention discloses a method for preparing dimethyl 1, 4-cyclohexanedicarboxylate from dimethyl terephthalate through hydrogenation, which comprises the following steps: under the catalysis of a ruthenium-containing catalyst taking cerium dioxide as a carrier, carrying out hydrogenation reaction on dimethyl terephthalate in a solvent in a hydrogen atmosphere to obtain dimethyl 1, 4-cyclohexanedicarboxylate, and separating the dimethyl 1, 4-cyclohexanedicarboxylate from dimethyl terephthalate to obtain dimethyl 1, 4-cyclohexanedicarboxylate. And after the reaction is completed, the high-purity dimethyl 1, 4-cyclohexanedicarboxylate can be obtained only by filtering out the catalyst and concentrating to remove the solvent, and the operation is simple and convenient.

The invention provides a flexible switching production method and equipment for low cis-polybutadiene rubber (LCBR), solution polymerized styrene-butadiene rubber (SSBR) and hydroxyl-terminated liquid polybutadiene rubber (HTPB), the flexible switching production equipment comprises an initiator production device and a polymerization unit, and the flexible switching production method comprises the following steps: mixing cyclohexane and n-hexane according to a volume ratio of 6.5: 3.5-7: 3, adding an initiator, and stirring to obtain a mixture; forming a mixed solvent; the method comprises the following steps: adding a monomer, an active agent, an initiator and a mixed solvent into a polymerization kettle 31 of a polymerization unit, and carrying out polymerization reaction to obtain a low-cis-polybutadiene, solution polymerized styrene-butadiene or hydroxyl-terminated liquid polybutadiene rubber solution; a novel protection initiator tert-butyl dimethyl siloxy propyl sodium is designed, and hydroxyl-terminated liquid polybutadiene rubber with a controllable structure is prepared through anionic living polymerization. According to the process, shutdown for kettle cleaning is not needed, the low cis-polybutadiene, the solution polymerized styrene-butadiene and the hydroxyl-terminated liquid polybutadiene rubber can be produced on the same polymerization device in a flexible switching manner, and the overall production efficiency is improved.

This invention belongs to the field of membrane material preparation and modification technology, and relates to a method for pre-wetting the surface of a hydrophobic ceramic membrane. The ceramic membrane is immersed in a cyclohexane solution of perfluorooctyltrimethoxysilane for 3-4 hours. After immersion, the ceramic membrane is dried in an oven. An ethanol solution is forced to circulate through the ceramic membrane to pre-wet the separation layer. The pre-wetting process proposed in this invention is simple, highly controllable, and easily scaled up to pre-wet multi-channel hydrophobic ceramic membranes. This invention achieves coarse adjustment of the wetting degree by controlling the concentration of the ethanol-water solution, and further fine adjustment by combining the circulation time of the ethanol-water solution, thus achieving more precise control of the wetting degree and optimal improvement of the uniformity of the hydrophilic coating.

The invention relates to an aliphatic copolyester elastomer and a preparation method thereof, and belongs to the field of high polymer materials. The elastomer is prepared through a series ring-opening copolymerization reaction of epoxide and cyclic anhydride, and the method comprises the following steps: under the action of a metal-free catalyst (a phosphazene ligand P1-tert-octyl / triethyl boron system) and an initiator (terephthalyl alcohol), carrying out a series ring-opening copolymerization reaction on epoxide and cyclic anhydride, the preparation method comprises the following steps: reacting epoxide (such as epoxypropane and allyl glycidyl ether) with aliphatic anhydride (such as glutaric anhydride) in a xylene solvent to generate a polyester prepolymer retaining an active end; adding a second group of epoxide (such as cyclohexene oxide) and anhydride (such as tetrahydrophthalic anhydride and norbornene dianhydride), continuously reacting to form a block copolymer, and then crosslinking. The material performance can be regulated by changing the monomer combination, the atom economy is high, and the raw materials can be produced on a large scale. The process is simple and environment-friendly, and a new choice is provided for application of the degradable elastomer in the fields of medical treatment, environmental protection and the like.

Provided is a highly adhesive polyester film having excellent adhesion to a functional layer such as a hard coat layer or an adhesive. Also provided is a laminated polyester film provided with the functional layer. The present invention relates to a highly adhesive polyester film having a polyester film base material and a coating layer on at least one surface of the base material, the coating layer comprising a polycarbonate polyurethane resin and a polyester resin, the polycarbonate polyurethane resin and the polyester resin each have a structure in which a cyclohexane ring is included in the molecule, and at least one hydrogen atom in the cyclohexane ring is substituted by a hydrocarbon group.

The invention belongs to the technical field of drug synthesis, and particularly relates to an adamantane derivative as well as a synthesis method and application thereof. The adamantane derivative comprises an intermediate structural formula I, an intermediate structural formula II and an intermediate structural formula III, and the structural general formula is as follows: Linker is substituted or unsubstituted C6-C10 aroyl, R1 is hydrogen or C1-C6 alkyl, R2 is hydrogen, C1-C6 alkyl or a nitrogen-containing or nitrogen-free structural fragment, or the integral structure of R1R2 is N-substituted heterocyclic pentyl or heterocyclic cyclohexyl. According to the adamantane derivative provided by the invention, an adamantane structure is combined with part of groups of OAB-14, and a parent nucleus structure is changed, so that the drug activity is improved. The invention also provides a synthesis method of the compound, the obtained compound is screened through cell viability research, and the compound has a potential synergistic effect in the aspects of preventing influenza and treating Alzheimer's disease.

The invention discloses high-density fuel oil and a preparation method thereof. Comprising the following steps: carrying out alkylation reaction on medium and low temperature coal tar fractions, cyclohexane, a catalyst and a modifier to obtain alkylated modified coal tar; and hydrofining the alkylated modified coal tar to obtain the high-density fuel oil. Through alkylation modification reaction of medium and low temperature coal tar fractions, the problem of ring growth when coal tar is used as a raw material to synthesize high-density fuel is solved. The preparation method is simple in step, alkylation reaction raw materials are easy to obtain, and the physical and chemical properties of the prepared coal-based mixed fuel are superior to those of a high-density fuel prepared from a single compound. The density value of the high-density fuel oil is larger than 1.092 g / mL, the heat value is larger than 42.8 MJ / L, and the high-density fuel oil can meet the requirement for development of high-performance aircrafts.

The invention relates to the technical field of functional coatings, in particular to a high-strength rain erosion resistant coating and a preparation method thereof.The high-strength rain erosion resistant coating is composed of polyaspartic acid ester resin (A) and a high-elasticity aliphatic polyurea curing agent (B), 2, 3-bis (aminomethyl) cyclohexane, chain-extended diamine and diethyl maleate are subjected to an addition reaction to prepare the high-molecular polymer; the component B is synthesized from dicyclohexylmethane diisocyanate, isophorone diisocyanate, polycarbonate diol and a hexamethylene diisocyanate tripolymer step by step; the high-strength rain-erosion-resistant coating is obtained by adding the functional filler, the flatting agent, the ultraviolet absorbent and the environment-friendly solvent into the component A and the component B in a stirring reaction kettle and stirring in a heat preservation mode, a coating film of the high-strength rain-erosion-resistant coating has excellent mechanical strength, meanwhile, the high-strength rain-erosion-resistant coating is more resistant to rain erosion, construction is convenient and fast, and the high-strength rain-erosion-resistant coating is remarkably superior to a commercially available optimal protective film; the method can be widely applied to outer surface protection of high-end equipment such as aviation, wind power and high-speed rails.

The invention discloses a preparation method of a catalyst for dehydrogenation of methylcyclohexane. The preparation method specifically comprises the following steps: step 1, preparing a catalyst carrier 2D-CrB; and 2, preparing the catalyst Pt / 2D-CrB according to the product obtained in the step 1. The invention also discloses a catalyst for dehydrogenation of methylcyclohexane. The problem that the efficiency is low when the existing catalyst is used for catalyzing the dehydrogenation reaction of methylcyclohexane is solved.

The invention discloses an isosorbide-based heat-resistant yellowing-resistant biodegradable polyester and a preparation method thereof.The preparation method comprises the following steps that under the condition of an esterification catalyst, dibasic acid and dihydric alcohol are subjected to an esterification reaction, the dibasic acid is composed of terephthalic acid and 1, 1-cyclohexanedicarboxylic acid, and the dihydric alcohol is composed of 1, 1-cyclohexanedicarboxylic acid; the dihydric alcohol is composed of isosorbide and aliphatic dihydric alcohol; after the esterification reaction is finished, adding a polycondensation catalyst, a stabilizer and a toner into an esterification reaction product to carry out polycondensation reaction; after the polycondensation reaction is finished, the polycondensation product is subjected to bracing and grain-sized dicing, and the isosorbide-based heat-resistant and yellowing-resistant biodegradable polyester is obtained. 1, 1-cyclohexanedicarboxylic acid is introduced to replace part of terephthalic acid, aromatic ring structures on polyester chains are reduced, the yellowing resistance of polyester is improved, meanwhile, biomass-sourced isosorbide is added as a heat-resistant modified component, and the isosorbide-based heat-resistant and yellowing-resistant biodegradable polyester is obtained through a direct esterification method.

The present invention provides a method for preparing a magnesium-based hydrogen storage material and a magnesium-based hydrogen storage material. The method comprises the following steps: introducing hydroxyl groups onto the surface of TiO2 using a hydrothermal method to obtain TiO2 nanotubes, grafting aminopropylsiloxane onto the TiO2 surface to obtain modified TiO2 nanotubes; introducing reduced graphene oxide into the modified TiO2 nanotubes to obtain a graphene@TiO2 nanocomposite catalyst; and introducing the graphene@TiO2 nanocomposite catalyst into nanomagnesium particles using a dry method and a wet ball milling method using cyclohexane as a solvent to obtain a magnesium-based hydrogen storage material. This method can produce a magnesium-based hydrogen storage material with a high hydrogen storage capacity.

The invention provides a method for synthesizing diethyl adipate through dynamic covalent chemical regulation. Comprising the following steps: S1, sequentially adding 80-120g of adipic acid, 160-240mL of absolute ethyl alcohol, 5-8g of a difunctional dynamic regulation and control carrier, 2-4g of a ternary composite catalyst, 1-2g of a synergistic additive and 100-150mL of a mixed solvent consisting of cyclohexane and methylbenzene into a 500mL four-neck flask provided with a thermometer, a water segregator and a pH sensor, and adjusting the initial pH value to 8.0-8.5; stirring and reacting for 6 to 8 hours at the rotating speed of 450 to 500r / min under the condition of 70 to 75 DEG C; and S2, after the reaction is finished, cooling to 25 DEG C, separating and recovering the bifunctional dynamic regulation and control carrier and the ternary composite catalyst, introducing CO2 into the filtrate to regulate the pH value to 5.0-5.5, releasing the captured moisture, and carrying out reduced pressure distillation under the conditions of 80-90 DEG C and-0.08 MPa to obtain diethyl adipate. By means of the rare earth ion-carbon quantum dot-ionic liquid ternary composite catalyst, efficient catalysis under the strong acid-free condition is achieved, and the catalyst recovery rate and the product purity are greatly improved.

The preparation method comprises the following steps: combining a solvent confinement hydrolysis-polymerization volatilization method with a roasting crystal transformation in-situ metal doping technology to prepare a mesoporous Ni-Al composite oxide carrier with an excellent structure, texture and surface properties, and carrying out in-situ metal doping on the mesoporous Ni-Al composite oxide carrier to prepare the Pt-loaded Ni-Al composite oxide catalyst for dehydrogenation of methylcyclohexane, so as to obtain the Pt-loaded Ni-Al composite oxide catalyst for dehydrogenation of methylcyclohexane. The preparation method comprises the following steps: loading a low-loading-capacity Pt active component by virtue of an impregnation method, realizing highly uniform dispersion and stable immobilization of Pt active sites on the surface of a carrier in a single atomic cluster form by virtue of a strong bonding effect between coordinated unsaturated aluminum species on the surface of the carrier and a Pt precursor, improving an electronic structure of the metal Pt active sites, and preparing the catalyst. The catalytic activity of the catalyst on a low-temperature dehydrogenation reaction of methylcyclohexane is improved. The Pt dispersity of the Ni-Al composite oxide loaded Pt catalyst reaches 60.0% or above, and the Ni-Al composite oxide loaded Pt catalyst shows extremely high catalytic activity, selectivity, stability and reproducible and reusable performance in a low-temperature dehydrogenation reaction of methylcyclohexane.