27 results about "Reversible reaction" patented technology

The application provides a crosslinked polyethylene insulating material with intrinsic self-repairing and recyclable characteristics, a preparation method and application thereof, and relates to the technical field of cable materials.The crosslinked polyethylene insulating material with intrinsic self-repairing and recyclable characteristics is prepared from the following components in parts by weight: 99.7 parts by weight of low-density polyethylene, 1.0-2.6 parts by weight of peroxide, 0.1-0.5 parts by weight of antioxidant, 5-20 parts by weight of maleimide monomer, 0.35-0.7 parts by weight of catalyst, 0.5-3.0 parts by weight of ligand and 0.5-3.0 parts by weight of furan-based small molecule.The low-density polyethylene is functionally modified through catalytic amination reaction, so that the chain breaking and crosslinking in the modification process are avoided, and the mechanical properties, insulating properties and dielectric properties of the crosslinked polyethylene are enhanced through the post-absorption of the introduced peroxide.Meanwhile, the dynamic reversible Diels-Alder reaction introduced by the post-absorption of the furan-based small molecule enables the polyethylene insulating material to have good intrinsic self-repairing effect on mechanical damage and electrical damage.

The invention discloses polycaprolactone dihydric alcohol containing maleimide groups and a preparation method and application thereof, and the preparation method of the polycaprolactone dihydric alcohol comprises the following steps: adding N-(2, 3-dihydroxy propyl) maleimide, caprolactone and a catalyst into a reaction container, carrying out high-temperature reaction for 12-18 hours, filtering, washing, and drying to obtain the polycaprolactone dihydric alcohol containing the maleimide groups. And cooling and discharging to obtain the polycaprolactone diol containing the maleimide group. The polycaprolactone diol containing the maleimide group is used as a raw material to prepare a polyurethane prepolymer, so that the side chain of the prepolymer is provided with the maleimide group, and then a difuran compound is introduced as a dynamic cross-linking agent to obtain the self-repairing polyurethane elastomer containing the Diels-Alder bond. Through the reversible Diels-Alder (D-A) reaction effect of the functional components, the polyurethane elastomer can be remodeled and recycled, and the polyurethane elastomer has excellent and stable mechanical properties, self-repairing efficiency and repeated self-repairing capability.

The invention discloses a urease activity detection method based on a non-reversible reaction of dopamine and resorcinol. The urease activity detection method comprises the following steps: mixing a sample to be detected, a buffer solution with the pH value of 7.0 and a urea solution with a certain concentration; adding a certain amount of dopamine and resorcinol into the mixed solution, under the condition of 25-45 DEG C, catalyzing urea hydrolysis by urease, causing the pH value of the surrounding area of the urease to rise so as to form a local alkaline environment, further inducing the reaction of the dopamine and the resorcinol to generate a blue fluorescent substance, and adding excessive hydrochloric acid to terminate the reaction after the reaction is carried out for 40-120 minutes; and detecting the fluorescence intensity of the reaction liquid by using a fluorospectro photometer, and calculating the urease activity in the sample according to a fluorescence intensity-urease concentration standard curve. The urease activity detection method based on the reaction of dopamine and resorcinol has the advantages of high detection speed, high sensitivity, good selectivity and the like.

The invention relates to a plastic material comprising at least one polymer that comprises a plurality of chemical bonds that can be broken by a chemically reversible reaction, the chemical bonds being arranged in the polymer so as to obtain a plurality of oligomers having a molecular weight 5 to 20 times lower than that of the polymer after chemical breakdown of the polymer.

The invention belongs to the technical field of liquid metal corrosion numerical simulation, and particularly relates to a liquid metal corrosion simulation method based on a near-field dynamic reaction diffusion equation. By adopting a near-field dynamics method, the problems of heterogeneity, damage and the like can be naturally simulated; the corrosion process is regarded as a chemical reaction process, the relation between a reaction term and the current density and the overpotential can be directly obtained through formula derivation, the influence of the concentration gradient on the corrosion process is relieved, and the reversible reaction can be simulated; a phase change mechanism of autonomous evolution of the interface is combined, an autonomous moving solid-liquid interface is obtained, a random mechanism of mechanical key formation and fracture is introduced into a phase change model, and random characteristics in the random mechanism are described. According to the method, the influence of some parameters or conditions on the liquid metal corrosion process can be researched while the liquid metal corrosion process can be visually and physically described, and favorable help is provided for research in the field of liquid metal corrosion.

The application belongs to the field of chemical separation and functional materials, and provides an industrial hemp metabolite extraction method based on dynamic borate reversible reaction. The application adopts a core-shell mesoporous functional adsorbent design. The adsorbent comprises a mesoporous silica core and an organic shell layer containing a pincer-type double-boron recognition cavity. The distance from boron to the boron center is 0.32-0.50 nm. The selective adsorption of ortho-diphenol type industrial hemp metabolites is realized under the condition that the volume fraction of ethanol is 85-96 vol%, and the temperature is 30-40 DEG C. The borate bond is reversibly broken by reducing the acidity and / or introducing a glycol competitive agent to complete mild desorption, realizing the performance of a selectivity coefficient of greater than or equal to 100, a recovery rate of greater than or equal to 95%, an activity retention rate of greater than or equal to 90% after 100-200 cycles, and a boron leaching amount of less than or equal to 1 ppm. The triple contradiction between the shell layer cross-linking and recognition cavity accessibility, high liquid hourly space velocity and ethanol-water microenvironment regulation, mild regeneration and site chemical integrity is solved, and the application has wide application value.

This invention discloses a method for preparing a 3D-printed impact-resistant elastic conductor material. Silver particles / silver nanosheets are used as the conductive phase, and polyboron dimethylsiloxane (PBMS) is used as the impact-resistant material. The addition of a polyhydroxyl-based low-boiling-point solvent reversibly adjusts the density of the dynamic B-O crosslinking bonds within PBMS and reversibly increases the number of silanol groups, thereby increasing the hydrogen bond density and enhancing the printability of PBS without affecting its shock-absorbing effect. This invention utilizes the reversible reaction principle between the polyhydroxyl-based low-boiling-point solvent and the dynamic B-O crosslinking bonds to control the decrease and recovery of B-O density. Simultaneously, due to the percolation effect of silver powder particles / silver sheets, the Ag / PBS impact-resistant elastic conductor exhibits excellent conductivity. After vacuum drying of the polyhydroxyl-based low-boiling-point solvent in the printed pattern, the density of the dynamic B-O crosslinking bonds is restored, and the Ag / PBS impact-resistant elastic conductor regains its good shear thickening effect, conductivity, sensing performance, and self-healing properties.

This system provides a silica scale generation prediction system that can predict the amount of silica scale generated with greater accuracy. [Solution] The silica scale generation prediction system according to the present invention is based on the temperature T at the predicted site of the target object. s A prediction formula PF for silica concentration C, which depends on the silica concentration, and the time t until the silica-containing fluid reaches the predicted site. s The system includes a silica scale generation prediction unit that predicts the amount of silica scale generated at a predicted site based on at least one of the silica concentration C prediction curve PC which depends on the silica concentration C, wherein the silica concentration C prediction formula PF and the silica concentration C prediction curve PC are obtained based on a reaction model generated using a silica polymerization reaction that includes reversible and irreversible reactions and precipitation equilibrium reactions of silica contained in the fluid, and the silica scale generation prediction unit calculates the amount of silica scale generated at the predicted site using at least one of the initial silica concentration Ci and the fluid flow rate FR.

A layered metal-organic framework (MOF) material and a preparation method and use thereof are provided. The layered MOF material has a chemical formula of [Zr6(μ3-O)4(μ3-OH)4(OH)4(H2O)4(HPCDA)4], where the organic ligand (H3PCDA) is 4,4′-(9-(1H-pyrazol-4-yl)-9H-carbazol-3,6-diyl)dibenzoic acid. The MOF is synthesized as follows: under closed conditions, the organic ligand 4,4′-(9-(1H-pyrazol-4-yl)-9H-carbazol-3,6-diyl)dibenzoic acid and a zirconium salt are allowed to undergo a solvothermal reaction in an organic solvent to produce a crystal of the MOF material. The MOF material can allow the reversible reactive capture of SO2.

The invention belongs to the field of chemical separation and functional materials, and provides an industrial cannabis sativa metabolite extraction method based on a dynamic borate reversible reaction. A core-shell mesoporous functional adsorbent design is adopted, the adsorbent comprises a mesoporous silicon dioxide core and an organic shell layer containing a clamp type double-boron recognition cavity, the distance from boron to the boron center is 0.32-0.50 nm, and selective adsorption of the o-diphenol industrial cannabis metabolite is achieved under the conditions that the ethanol volume fraction is 85-96 vol% and the temperature is 30-40 DEG C; mild desorption is completed by reducing acidity and / or introducing a diol competitor to reversibly break boric acid ester bonds, and the performance that the selectivity coefficient is larger than or equal to 100, the recovery rate is larger than or equal to 95%, the activity retention rate is larger than or equal to 90% after circulation is conducted 100-200 times, and the boron leaching amount is smaller than or equal to 1 ppm is achieved; triple contradictions between shell cross-linking immobilization and recognition cavity accessibility, high liquid hourly space velocity and ethanol-water microenvironment regulation and control and mild regeneration and site chemical integrity are solved, and the method has wide application value.

The application discloses a fluidized reaction process of calcium-based heat storage material. The fluidized reaction process of the calcium-based heat storage material comprises the following steps: S1: under the blowing of airflow, a solid mixture of inert solid particles and the calcium-based heat storage material is allowed to reversibly react in a fluidized bed reactor to obtain material A; the inert solid particles are A-type particles which do not participate in the reversible reaction of the calcium-based heat storage material, the mass percentage of the inert solid particles in the solid mixture is 55-90%, and the airflow comprises fluidized gas which does not participate in the reversible reaction of the calcium-based heat storage material; S2: the material A is fed into a cyclone separator, the inert solid particles in the material A are separated and fed back into the fluidized bed reactor. The application greatly improves the fluidization effect of calcium-based heat storage material Ca(OH)2 / CaO powder, improves the conversion rate and cycle performance of the calcium-based heat storage material, improves the exothermic reaction temperature, and the heat production quality is higher.

The invention discloses a modified aramid fiber and a preparation method thereof, and the modified aramid fiber is characterized in that a bifunctional molecular layer is grafted on the surface of the aramid fiber through chemical bonds. The molecular layer is provided by an organosilane bifunctional coupling agent with a structural general formula of X-L-Y, X is a group (such as chlorosilane, alkoxy silane and the like) capable of forming a stable first covalent bond with the fiber surface, Y is a group (such as furyl, maleimide and the like) capable of forming a dynamic covalent bond interface with a resin matrix, and L is a connecting chain. The preparation method comprises the following steps: carrying out surface activation treatment on the aramid fiber, and then carrying out grafting reaction on the aramid fiber and a difunctional coupling agent under the action of a catalyst. According to the method, a molecular layer with stable anchoring and dynamic reversible reaction characteristics is introduced to the surface of the fiber, so that the obtained composite material obtains high interfacial shear strength (ILSS), the mode I interlayer fracture toughness (GIC) is remarkably improved, and the technical problem that the interfacial strength and toughness are difficult to synergistically improve in a traditional modification method is effectively solved.

The invention relates to a continuous production method and system of terephthalic acid diester. The method comprises the following steps: introducing terephthalic acid and alcohols into a first tubular reactor for primary esterification reaction, and condensing to obtain a reaction mixture; carrying out reverse osmosis treatment on the reaction mixture through a membrane module to respectively obtain a concentrated solution and a penetrating fluid containing water and alcohols; carrying out pervaporation separation treatment on the penetrating fluid to respectively obtain alcohols and water; and introducing the obtained alcohol and the concentrated solution into a second tubular reactor for secondary esterification reaction to obtain the terephthalic acid diester. According to the method, the tubular reactor is combined with the reverse osmosis membrane and the vaporizing osmosis membrane, so that the mass and heat transfer effects are enhanced, the use of a catalyst is avoided, the reaction time is shortened, and the generation of byproducts is reduced; meanwhile, by separating water and breaking reversible reaction balance, the reaction can be continuously and positively carried out, the yield of the target product terephthalic acid diester is increased, the technological process is simple, and the method is suitable for industrial production.

The application discloses a poly-caprolactone diol containing a maleimide group and a preparation method and application thereof, and the preparation method of the poly-caprolactone diol is as follows: N-(2,3-dihydroxypropyl) maleimide, caprolactone and a catalyst are added into a reaction container, and after high-temperature reaction for 12-18 hours, the poly-caprolactone diol containing the maleimide group is obtained by discharging after temperature reduction. The poly-caprolactone diol containing the maleimide group is used as a raw material to prepare a polyurethane prepolymer, so that the side chain of the prepolymer has the maleimide group, then a double-furan compound is introduced as a dynamic crosslinking agent to obtain a self-repairing polyurethane elastomer containing a Diels-Alder bond. The polyurethane elastomer can be remolded and recycled through the reversible Diels-Alder (D-A) reaction of the functional components, and has excellent and stable mechanical properties, self-repairing efficiency and repeated self-repairing capacity.

The application belongs to the field of material synthesis, and particularly relates to a loofah-like covalent organic framework material and a preparation method and application thereof.i) uniformly dispersing a monomer C3 containing an aldehyde group function and a triazine structure, a monomer C2 containing an amino group and a mercapto group, a catalyst and a regulator in an organic solvent to obtain a dispersion liquid;ii) allowing the dispersion liquid to undergo a reversible reaction at 20-50 DEG C for 1-5 days, so that the construction units of the two monomers are connected together to obtain a corresponding product, and the product is washed and dried to obtain the loofah-like covalent organic framework material.The preparation method of the application can synthesize the covalent organic framework material under room temperature conditions, the reaction condition is mild, the preparation is convenient, the harsh conditions of high-temperature synthesis are avoided, the micro morphology can be controlled, and the covalent organic framework material with a loofah-like structure is prepared.

The invention relates to the technical field of hazardous waste resource utilization, in particular to an anti-poisoning catalyst for fly ash low-temperature pyrolysis and a preparation method thereof.According to the catalyst, hierarchical pore titanium dioxide serves as a carrier, vanadium pentoxide serves as an active component, cerium-zirconium composite oxide is introduced to serve as a chlorine trapping agent, and phosphate serves as a heavy metal stabilizer. Through unique component design, the catalyst can effectively solve the problem that the catalyst is poisoned and inactivated due to chlorine and heavy metals in a fly ash pyrolysis environment. The cerium-zirconium component dynamically captures gas-phase chlorides through a reversible reaction, and active sites are protected; the phosphate component can react with heavy metals in situ to generate stable minerals, so that chemical fixation is realized. The fly ash treating agent has extremely high chlorine poisoning resistance and heavy metal poisoning resistance, is long in service life, and provides effective technical support for harmless and resourceful treatment of fly ash.

The application discloses a compound and a nucleic acid synthesis method. The compound is shown as formula A or B. The nucleic acid synthesis method uses a new protecting group to replace a DMT protecting group, and the deprotection reaction can be completed under alkaline conditions. The deprotection reaction can be efficiently and quantitatively completed to release 5'-OH for a coupling reaction in the next step. The deprotection reaction is an irreversible reaction. The protecting group is not sensitive to acid. The by-product after deprotection is a stable compound and does not react with each group on the oligo.

The invention relates to spiropyrans and a method of making the same. In particular, the present invention provides a method of exchanging the indole and salicylaldehyde moieties of spiropyrans in a reversible reaction. The method is used for synthesizing two-color photoinitiators with specific substituents and substitution patterns, which improves two-color volume printing (two-color volume printing). In addition, the invention also discloses a method for locally polymerizing a starting material through two-color photopolymerization.

The application provides a method for preparing D,L-menthyl benzoate, belongs to the field of organic chemical synthesis, uses a sodium methoxide / magnesium oxide type solid base catalyst instead of a strong acid catalyst and a sodium methoxide catalyst, does not corrode equipment, and the used solid base catalyst is convenient to separate and can be recycled; safe and low-toxicity solvents are used, a solvent reflux dropping process is adopted, a reversible reaction continuously proceeds in the direction of synthesizing menthyl benzoate, and the yield of menthyl benzoate is higher; compared with a traditional menthyl benzoate synthesis method, the sodium methoxide / magnesium oxide type solid base catalyst is a good catalyst for synthesizing menthyl benzoate, and the use of one or mixed solvents of solvents such as dichloromethane, cyclohexane, n-heptane and cyclooctane promotes the reaction, so that the yield of menthyl benzoate is higher, the synthesis process of the experiment is simple, and the method has high application value.

The application discloses an L-homoserine phosphotransferase mutant, a coding gene, a plasmid, a genetically engineered bacterium and application, and belongs to the technical field of bioengineering, wherein a cysteine at the 223th position of L-homoserine phosphotransferase is mutated into a glycine single mutation or a double mutation of mutating isoleucine at the 180th position into serine on the basis of the single mutation, namely the L-homoserine phosphotransferase mutant, a corresponding coding gene is obtained, and then a corresponding plasmid and genetically engineered bacterium are obtained; the enzyme mutant not only has high enzyme activity, but also is resistant to feedback inhibition of alpha-ketoglutarate; compared with simply improving enzyme activity, the application can further promote the synthesis of L-homoserine by affecting the reversible reaction direction. The application is suitable for applying the enzyme mutant to industrial fermentation production of L-homoserine, can significantly improve production efficiency, and can improve the yield of L-homoserine by about 60% by adding L-glutamine.

The invention discloses a variable working medium thermodynamic cycle construction method for coupling chemical reaction, which belongs to the technical field of thermodynamic cycle, and introduces controllable reversible chemical reaction into cycle, so that the chemical composition of a working medium is periodically and actively changed at different stages, and a dynamic conversion system for coupling heat energy, chemical energy and work is constructed. An adaptive reversible reaction system is screened, a heat absorption process and a heat release process are integrated, a chemical reaction process is utilized to replace a compression and expansion acting process in original circulation, an electrochemical reactor can be adopted to replace a traditional mechanical compression / expansion part, a static system without a moving part is constructed, and a target substance purification function can be integrated. Optimal matching of working media in all stages of circulation is achieved, the energy conversion efficiency is greatly improved, the multifunctional characteristic of energy and material collaborative conversion is expanded, the system structure is simplified, the system is matched with multiple scenes such as solar thermal power generation, industrial waste heat recovery, CCUS and strategic resource extraction, and the remarkable economic and environment-friendly value is achieved.

The invention relates to a synthesis method of active selenic acid donors APSe and PAPSe and a selenic acid compound, and belongs to the technical field of biology. According to the invention, ATP sulfating enzyme and APS kinase from different sources are utilized to catalyze ATP and selenate radicals, so that synthesis of active selenic acid donors APSe and PAPSe is realized. And by adding pyrophosphoric acid hydrolase to hydrolyze a byproduct pyrophosphoric acid, the reversible reaction is relieved, the synthesis of APSe is improved, and the conversion rate is increased to 90%. According to the method, ADP phosphorylase is added, so that ADP and PPi are recycled at the same time, and the conversion rate of PAPSe is increased to 85%. Furthermore, high-flux ATP sulfating enzyme is prepared through a self-assembly immobilized enzyme technology, and high-flux and multi-batch catalytic synthesis of PAPSe is achieved. And finally, by coupling a selenium acidification modification system, the modification synthesis of chondroitin selenate, N-heparin selenate, trehalose selenate and flavone selenate is realized.

The invention discloses a vacuum heat insulation efficient energy utilization device for simulating combustion membrane catalytic reversible reaction and light surging coupling, and belongs to the technical field of efficient energy conversion. The device is of a concentric / coaxial nested totally-closed structure and is sequentially provided with a core membrane catalytic reversible reaction layer, a light surge driving layer, a first-stage vacuum heat insulating layer, a total energy recovery layer, a total reflection radiation shielding layer, a second-stage vacuum sealing layer, a matched wavelength adjustable light incident window, an ion / product selective separation membrane and an energy output interface from inside to outside. The core membrane catalyst layer divides traditional combustion into three-step reversible element reaction, the light surge driving layer achieves directional driving through photon excitation photon-generated carriers and local photo-thermal, the double-layer vacuum heat insulation layer is matched with the high-reflection shielding layer to achieve heat conduction, convection and radiation triple loss blocking, the total energy recovery layer conducts reverse conversion on trace leakage energy and conducts backflow, and the total energy recovery layer is matched with the high-reflection shielding layer. And energy closed loop is realized. The device breaks the Carnot cycle limitation, has the theoretical energy utilization efficiency of 100%, the engineering actual efficiency of more than or equal to 99.9%, is flame-free in reaction, zero in pollutant emission, flexible in energy output form, compact in structure and high in environmental adaptability, can be widely applied to aerospace propulsion, aviation power, micro-nano energy chips, distributed power generation and other scenes, and has wide application prospects. And the method has obvious energy utilization value and industrial application prospect.

The application relates to the technical field of lithium ion batteries, and particularly discloses a zinc metatitanate negative electrode material and a preparation method and application thereof, which comprises the following steps: S1, sodium stannate and zinc acetate and urea are dissolved in a mixed solution of ethanol and deionized water, and after uniform mixing, zinc metatitanate powder is obtained through hydrothermal treatment, centrifugal drying and calcination; S2, a lithiation reagent and metal lithium are dissolved in a tetrahydrofuran solvent to obtain a chemical prelithiation reagent solution, and the prelithiation reagent solution at least comprises diphenyl, lithium and tetrahydrofuran; S3, the prepared zinc metatitanate powder is reacted in the chemical prelithiation reagent solution or in the chemical prelithiation reagent vapor, and after vacuum drying, zinc metatitanate negative electrode material is collected. Through a prelithiation method, a uniform SEI film is generated on the surface of the zinc metatitanate material, the material surface can be effectively protected, and the occurrence of irreversible reactions can be reduced, so that the first-cycle coulombic efficiency and the cycle stability of the negative electrode material are improved, and the cycle performance can be improved.

The present application relates to a kind of chemical reaction preparation equipment, specifically a kind of reversible esterification reaction control device that catalytic reaction moves to product direction, including truss and electric control heating furnace installed on truss, truss is also installed with cooling mechanism, cooling mechanism is communicated with the inside of reaction dish;Reaction dish is also provided with feeding mechanism and acceleration mechanism, and acceleration mechanism cooperates with feeding mechanism and cooling mechanism.By the way of mechanical interlocking cooperation, the corresponding cooperation relationship between the gas circulation rate in reaction dish, cooling rate, stirring speed and the feeding rate of reactant is established, the faster the stirring speed, the feeding rate of reactant is followed up, at the same time, the gas circulation rate in reaction dish and the cooling rate of gas are also accelerated, to ensure that the concentration of reactant in reaction dish is constantly increasing, and product water is constantly reduced, which is conducive to the direction of product to promote reversible reaction.

The invention relates to a plastic material comprising at least one polymer having a plurality of chemical bonds that can be broken by a chemically reversible reaction, said chemical bonds being arranged in the polymer so as to obtain a plurality of oligomers having a molecular weight 5 to 20 times lower than that of the polymer after chemical degradation of said polymer. Abstract figure: Fig. 2

The invention discloses an electric control separation membrane for realizing membrane flux recovery in situ as well as a preparation method and application thereof, and belongs to the technical field of water treatment. The preparation method comprises the following steps: performing electrochemical oxidation on a base membrane to obtain an oxidized base membrane; carrying out chemical nickel plating on the oxidized base film to obtain a nickel-plated film; oxidizing the nickel-plated film to obtain an oxidized nickel-plated film; and freezing and drying the nickel oxide plated film to obtain the electric control separation film. According to the preparation method of the electric control separation membrane, the stainless steel mesh serves as a base material, surface extreme wettability construction, chemical nickel plating, plating oxidation and other processes are carried out, the preparation process has the advantages of being simple, low in cost, free of secondary pollution and the like, and roll-to-roll large-scale production of the electric control separation membrane can be achieved; the electrically-controlled separation membrane coating can efficiently realize in-situ recovery of membrane flux, and acid, alkali and hydrogen peroxide generated by reversible reaction of nickel hydroxide and nickel oxyhydroxide in the electrochemical cleaning process strengthen the cleaning effect of the membrane.