18 results about "Diethylzinc" patented technology

The application discloses a synthesis method of a 2-substituted-3-trifluoromethylselenyl indole compound. The method uses a 2-trifluoromethylselenyl acetylene aniline derivative as a substrate, diethyl zinc as an alkali, a zinc salt as a promoter, and performs a reaction in a solvent, and then adds an electrophilic reagent to synthesize the 2-substituted-3-trifluoromethylselenyl indole compound. The synthesis method has the advantages of simple operation, diversified products, and one-pot high-efficiency synthesis of products which are not easy to obtain by other methods.

This invention discloses a closed-loop sampling data analysis and processing system for diethylzinc. In the field of data processing technology, this invention eliminates the redundant processing mode of existing technologies that involve full-scale data acquisition, transmission, and computation through a sliding window dynamic triggering mechanism. Instead, it triggers the analysis step only when the data volume within the window reaches a preset fixed amount, effectively reducing the transmission and computational load of invalid data. This fundamentally solves the core technical problem of excessively high data processing latency and inability to meet the real-time requirements of high-risk diethylzinc sampling scenarios in existing technologies. By combining hit variable statistics and effective hit rate quantification, it achieves accurate differentiation between invalid and valid data during closed-loop sampling, avoiding interference from invalid data on the anomaly identification model. This solves the core technical problem of low risk identification accuracy and susceptibility to missed or false positives in existing technologies, ensuring the safety of the sampling process and the validity of the samples.

The invention relates to the field of chemical sampling safety guarantee, in particular to an intelligent closed sampling safety guarantee system for diethyl zinc. The device comprises a magnetofluid sealing assembly, an intelligent deformation sealing assembly, a gas replacement protection layer, a double-wall structure negative pressure isolation cavity and a condensation trapping assembly which are arranged in sequence, each assembly forms a dynamic complementary enhancement loop through a state sensing unit comprising a quantum cascade laser detection module and an electrochemical array detection module and a control unit integrated with a fuzzy control algorithm, and when the performance parameter of any assembly deviates from a threshold value, a grading compensation strategy is automatically triggered. And the specific composition and parameters of each component are limited. The technical effects that the safety of the diethyl zinc sampling process is effectively guaranteed, dynamic complementary enhancement is achieved through multi-assembly cooperation and intelligent control, assembly performance changes can be coped with in time, the leakage condition can be accurately detected, emergency response can be triggered, and meanwhile the residual life of the material can be accurately predicted are achieved.

The invention relates to a SiO2-coated Al2O3 loaded rare earth three-way catalyst, a preparation method thereof and application of the catalyst in polycarbonate synthesis, and belongs to the technical field of polymer synthesis. According to the catalyst, SiO2-coated Al2O3 serves as a carrier to load a rare earth three-way catalyst, SiO2-coated Al2O3 is of a double-layer structure, the inner layer of SiO2-coated Al2O3 is SiO2, the outer layer of SiO2-coated Al2O3 is Al2O3, and the rare earth three-way catalyst contains yttrium trichloroacetate, glycerin and diethyl zinc. The SiO2-coated Al2O3 carrier with a double-layer structure is prepared, and the rare earth three-way catalyst is loaded by utilizing the characteristics of large specific surface area, abundant radial pore structures and abundant contactable active surfaces of the SiO2-coated Al2O3 carrier, so that the efficient polycarbonate synthesis catalyst is obtained; the catalyst has the characteristics of high catalytic efficiency (TON), high polycarbonate molecular weight, high carbonate chain link content, easiness in separation after the reaction is finished, and the like.

The invention relates to the technical field of batteries, and discloses a zero-volume-change lithium-free negative electrode material, a preparation method thereof and a lithium metal battery. The preparation method of the zero-volume-change lithium-free negative electrode material comprises the following steps: S1, by taking a mixture of polystyrene microspheres and absolute ethyl alcohol as a raw material, preparing a polystyrene microsphere template on a copper sheet by adopting a spin-coating method, and then annealing and densifying to obtain a PS template; s2, by taking diethyl zinc as a precursor, depositing a ZnO nano layer on the PS template by adopting an atomic layer deposition method; s3, taking Li3PO4 as a target material, and growing a lithium phosphorus oxygen nitrogen coating on a product obtained in the step S2 through magnetron sputtering; and S4, sintering the product obtained in the step S3, and removing the PS template to obtain the lithium-free negative electrode material with zero volume change. The lithium metal battery prepared from the negative electrode material is good in electrochemical stability and high in coulombic efficiency.

This invention discloses a copper nanoparticle-based SERS sensor, its preparation method, and its application in trace detection of doxorubicin. The sensor comprises a porous anodic alumina substrate, metal halide-oxide nanosheets vertically grown on its surface, and copper nanoparticles uniformly deposited on the surface and sidewalls of the nanosheets via atomic layer deposition (ALD). The preparation method involves first preparing the porous anodic alumina substrate via anodic oxidation, then self-assembling and growing the metal halide-oxide nanosheets, and finally using copper hexafluoroacetylacetone as a copper precursor and diethylzinc as a reducing agent, employing ALD to precisely control the particle size and distribution of the copper nanoparticles. This sensor is used for trace doxorubicin detection, with a detection limit as low as 0.5 ppm, covering the clinical therapeutic drug monitoring concentration range. It has the advantages of low cost, high sensitivity, and controllable structure. This invention provides a low-cost, high-sensitivity, structurally controllable, and highly consistent SERS sensor for trace doxorubicin detection.

This invention provides a long-chain linear α-olefin and its preparation method. The preparation method includes the following steps: Step 1, ethylene is subjected to oligomerization reaction under the action of a main catalyst, a co-catalyst, and a chain transfer agent; Step 2, after the oligomerization reaction in Step 1 is completed, the reaction mixture is mixed with a chain eliminator to carry out a chain elimination reaction, and then the chain elimination reaction is terminated to obtain a long-chain linear α-olefin; wherein the chain transfer agent is diethylzinc and / or diethylmagnesium. In the preparation method of the long-chain linear α-olefin of this invention, the ethylene polymerization activity is high, the α-olefin selectivity is high, the linear selectivity is high, and the oligomerization product is C8-C9. 30 The method yields linear α-olefins. Furthermore, the oligomers obtained by this invention have a narrow distribution, and the product distribution is not a Schulz-Flory distribution but follows a Poisson distribution. Therefore, the yield of long-chain linear α-olefins is higher, and the long-chain C... 12 ~C 20 The selectivity for linear α-olefins with a carbon number of up to 85 mol% can be achieved.

The invention relates to the field of high polymer materials, in particular to polyhydroxyalkanoate and a preparation method thereof. The preparation method of the polyhydroxyalkanoate comprises the following steps: in the presence of a solvent, catalyzing ring opening polymerization of a lactone monomer by adopting a zinc-based catalyst to prepare the polyhydroxyalkanoate, the zinc-based catalyst is prepared by carrying out coordination reaction on diethyl zinc and micromolecular dihydric alcohol in an inert atmosphere; the micromolecular dihydric alcohol comprises at least one of C2-C10 dihydric alcohol. According to the invention, the zinc catalyst composed of diethyl zinc and micromolecular dihydric alcohol is adopted to catalyze ring opening polymerization of lactone in the presence of the solvent to prepare polyhydroxyalkanoate, so that the molecular weight is increased, the polyhydroxyalkanoate with narrower molecular weight distribution is obtained, and the use performance of the polyhydroxyalkanoate is further improved.

The present invention belongs to the technical field of biodegradable polymer material synthesis and discloses a method for preparing high molecular weight polycaprolactone. The method uses a ketimine ligand and diethylzinc to react in situ to catalyze the ring-opening polymerization of caprolactone to prepare polycaprolactone. Under bulk conditions, the polymerization of ε-caprolactone can be catalyzed to prepare polycaprolactone without the participation of an initiator. This method has the advantages of in situ catalysis, short polymerization reaction time, high molecular weight of the obtained polymer, and narrow distribution. Through the synthesis technology of polycaprolactone disclosed in the present invention, the molecular weight of the synthesized polycaprolactone is more than 179,000, and the molecular weight distribution is between 1.55 and 1.70. The molecular weight reaches a maximum of 246,000, and the corresponding polymer molecular weight distribution is 1.65.

This invention discloses an alumina / zinc oxide co-doped polythiophene derivative conductive film, its preparation method, and its applications. The preparation method includes the following steps: reacting diethylzinc vapor and water vapor with an initial polythiophene derivative film, repeating this process several times to obtain a zinc oxide-doped polythiophene derivative film; then reacting trimethylaluminum vapor and water vapor with the zinc oxide-doped polythiophene derivative film, repeating the above steps to obtain an alumina / zinc oxide co-doped polythiophene derivative film. This process eliminates the influence of the liquid phase environment on the morphology and structure of the polymer film, and also allows for precise control of the doping amount of various precursor molecules within the polymer matrix. The preparation method disclosed in this invention has the advantages of simple operation, controllable doping process, and stable structure and properties of the modified polymer film, significantly improving the electrical conductivity of the material after modification.

The application discloses a method for late-stage carboxylation modification of C-H bond of aromatic hydrocarbon or pyridine after catalysis by iron compound. The method comprises the following steps: using iron compound as a catalyst, using arylthianthrenium salt or pyridine quaternary phosphonium salt prepared from aromatic hydrocarbon or pyridine as a substrate, using diethyl zinc as a reducing agent, and performing reaction under the condition of room temperature and one standard atmosphere of carbon dioxide atmosphere, and then performing acidification and purification treatment to obtain a corresponding carboxylic acid product. The method uses a transition metal iron compound which is good in biological compatibility, high in yield and low in price as the catalyst, has simple and mild conditions, is convenient to operate, has excellent functional group tolerance, can be used for synthesizing various high-value-added aryl or pyridyl carboxylic acids and late-stage site-selective carboxylation modification of complex drug molecules containing benzene rings or pyridine rings, and has significant application potential in the fields of new drug development and industrial production of carboxylic acid compounds.

The utility model relates to the technical field of closed sampling, in particular to a closed sampling system suitable for diethyl zinc. The closed sampling system comprises a pipeline used for being communicated with a reaction kettle or a container, a plurality of ball valves used for achieving opening and closing effects are arranged on the upper portion of the pipeline at intervals, the upper portion of the pipeline is in threaded connection with a conical flask used for sampling operation, one end of the pipeline is connected with a vacuum system, and the other end of the pipeline is connected with a vacuum pump. The other end of the pipeline is communicated with the reaction kettle or the container; a nitrogen inlet for blowing nitrogen is formed in one end, close to the vacuum system, of the upper part of the pipeline; according to the closed sampling system disclosed by the invention, the pipeline with the vacuum system, the nitrogen inlet, the conical flask and the ball valves is designed, so that vacuum impurity removal and nitrogen flushing operation can be realized in the pipeline through alternate control operation on the plurality of ball valves, and diethyl zinc is prevented from being in contact with air or remaining on the upper part of the pipeline in a sampling process.

The invention discloses a high-temperature heat-stable PE (polyethylene) material and a preparation process thereof, and belongs to the technical field of polyethylene materials. Comprising the following steps: vacuumizing a reactor, filling nitrogen for replacement, heating and baking the reactor in vacuum, cooling, introducing ethylene, heating at a constant temperature, adding modified olefin, a cocatalyst and diethyl zinc, magnetically stirring, dissolving the catalyst with toluene, and filling the dissolved catalyst into the reactor for polymerization reaction to prepare a modified polyethylene glue solution; taking the modified polyethylene glue solution, adding octadecanamide, mixing, heating, carrying out ultrasonic stirring, adding sorbitol, heating, and continuously carrying out ultrasonic stirring to prepare a preparation solution; adding the prepared solution into a twin-screw extruder for extrusion and granulation, carrying out compression molding, and cooling to obtain the PE material with high-temperature thermal stability. A highly branched polymer is formed in the ethylene polymerization process, so that the thermal stability of polyethylene is improved.

The invention relates to the technical field of preparation of organic compounds, and discloses a method for preparing sodium ethoxide from sodium acetate. The method specifically comprises the following steps: firstly, pretreating aluminum oxide to prepare a carrier, including roasting and dipping a solution containing ammonium dihydrogen phosphate and citric acid, and then roasting again; secondly, mixing the carrier with the dissolved ceric ammonium nitrate and mercaptoacetic acid, and drying to prepare a precursor; then, dipping the precursor in a diethyl zinc ethanol solution, and performing roasting treatment in a nitrogen atmosphere to obtain a catalyst; then filling a catalyst and sodium acetate in the fixed bed reactor, replacing gas, introducing hydrogen, and heating for reaction; and finally, cooling after the reaction is finished, adding absolute ethyl alcohol, and distilling to obtain sodium ethoxide. The method has the characteristics of simplicity and convenience in operation, low industrial cost, mild reaction conditions, environment friendliness, high product selectivity and the like, and the reaction efficiency and purity can be effectively improved.

The invention relates to a supported catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The supported catalyst provided by the invention comprises g-C3N4 and active components supported on the g-C3N4, wherein the active components comprise yttrium trifluoroacetate and diethyl zinc. The N site on the g-C3N4 is utilized to generate strong interaction with yttrium trifluoroacetate and zinc diethyl, so that the dosage of active ingredients is greatly reduced, the safety can be remarkably improved, and the cost of the catalyst can be reduced. By loading the active components on the g-C3N4 carrier, the problem that a homogeneous catalyst is difficult to separate in a reaction system can be avoided, so that residues of the catalyst in the reaction system are reduced to a great extent, the operation process of post-reaction treatment is simplified, and the preparation method has great significance in improving the quality of a polycarbonate product.

This invention discloses a method for preparing aryl carboxylic acids by reacting aryl thioonium salts with carbon dioxide using a copper compound as a catalyst and diethylzinc as a reducing agent. The aryl thioonium salt substrate is reacted with an organic solvent at room temperature under a carbon dioxide atmosphere at one atmosphere. The product is then acidified and purified to obtain the aryl carboxylic acid. This method uses readily available raw materials, is simple to operate, operates under mild conditions, and exhibits good functional group tolerance and substrate versatility. This method can not only synthesize various simply substituted aryl carboxylic acids but can also be used for the late-stage carboxylation modification of complex drug molecules. The practicality of this method has also been verified on a gram-scale, demonstrating promising prospects for industrial application.

The invention relates to the technical field of rare earth butadiene rubber preparation, and discloses a preparation method of rare earth butadiene rubber with narrow molecular weight distribution. The method comprises the four steps of catalytic center construction, seed glue solution generation, accurate chain extension of an active chain and product termination and aftertreatment, specifically, in an argon glove box, neodymium neodecanoate, diisobutylaluminium hydride and aluminum sesquiacetate are aged for 2 hours in refined cyclohexane at the temperature of 50 DEG C to form an active catalytic center, the Al / Nd molar ratio is controlled to be 30, and the Cl / Nd molar ratio is controlled to be 3.0; injecting a catalyst and 40% of refined butadiene into a first constant-temperature polymerization reactor at-10 DEG C for polymerization, and stopping to obtain a seed polymer when the conversion rate is 45%; transferring the glue solution containing the active chain to a second reactor, and supplementing the rest 60% of butadiene and diethyl zinc at a constant speed by sections within 90 minutes through a micro-injection pump at 70 DEG C; and injecting a mixed solution of ethanol and an antioxidant 264 to terminate the reaction, and carrying out two-stage steam stripping condensation, extrusion dehydration and fluidized bed drying to obtain the product.

The invention relates to a preparation method of a rare-earth-based composite catalyst and application of the rare-earth-based composite catalyst in synthesis of polycarbonate, and belongs to the technical field of chemical synthesis. According to the preparation method disclosed by the invention, phytic acid modified graphene oxide is used for preparing a carbon foam carrier, the carbon foam carrier is used for loading rare earth borohydride and diethyl zinc to prepare a rare earth-based composite catalyst, and the rare earth-based composite catalyst is used for preparing polycarbonate through copolymerization of carbon dioxide and epoxide; diethylzinc is fixed through rich oxygen-enriched functional groups on the surface of a carbon foam carrier, and further complexation with rare earth borohydride is performed to obtain an efficient polycarbonate synthesis catalyst, the rare earth-based composite catalyst is high in catalytic efficiency and easy to separate after the reaction is finished, and polycarbonate prepared through catalysis is high in molecular weight and high in carbonate chain link content.