704 results about "Fine chemical" patented technology

The invention relates to the field of fine chemical engineering, and discloses a green process for preparing chloramine T by a continuous flow reactor. The method comprises the following steps: respectively pumping p-toluenesulfonamide, a sodium hydroxide solution and a sodium hypochlorite solution into a micro-channel mixer for instantaneous mixing, and carrying out chlorination reaction in a multi-stage temperature control tubular reaction unit; the concentration of free chlorine is detected on line at an outlet, and the flow rate of a chlorine source is dynamically adjusted through a PID algorithm, so that closed-loop control is realized; the reaction liquid is directly crystallized and separated to obtain the product without alkali wash. The system comprises a base solution and chlorine source conveying subsystem, a micro-channel mixer, a multi-stage reaction unit, an online monitoring module, a central controller and a crystallization unit. The side reaction is inhibited from the source, so that the free chlorine is less than or equal to 0.5 mg / L, the alkali washing step is omitted, the COD (Chemical Oxygen Demand) of the wastewater is reduced by more than 80%, the product purity is more than or equal to 99.5%, and the productivity is improved by 3 times.

The invention relates to the technical field of fine chemical engineering and flame retardant preparation, and discloses a preparation method of bromo-triazine capable of improving thermal stability, and the preparation method comprises the following steps: mixing phenol, water and dichloromethane, controlling the temperature, and carrying out oxidative bromination reaction to prepare an organic phase containing tribromophenol; then, under the action of an organic amine catalyst, carrying out condensation reaction on the organic phase, liquid caustic soda and cyanuric chloride; after the reaction, washing with water to remove impurities; and in the presence of process water, firstly controlling the temperature at 38-42 DEG C for azeotropic desolvation, then raising the temperature to 85-95 DEG C for high-temperature crystallization and crystal growing, and finally cooling, filtering and drying to obtain the bromo-triazine product. By utilizing the high selectivity of the organic amine catalyst and a two-stage azeotropic crystallization process, the side reaction is effectively reduced, the solvent wrapped in the crystal is eliminated, the prepared product is high in main content and extremely low in volatile component, the temperature can reach 370 DEG C or above when the thermal weight loss is 2%, and the thermal stability is remarkably improved.

The invention belongs to the technical field of fine chemical organic synthesis, and discloses a synthesis method of 1, 3-propane sultone without generation of three wastes. The synthesis method comprises the following steps: by taking allyl alcohol, sulfite and hydrosulfite as raw materials, generating 3-hydroxy propanesulfonate; then removing part of water, adding a solvent A to separate out sulfite, filtering, and adding sulfuric acid into filtrate for acidification; and adding a solvent B to separate out sulfate, filtering and separating out the sulfate, and adding a dehydrating agent to carry out dehydration cyclization reaction to prepare the 1, 3-propane sultone. According to the synthesis method provided by the invention, a 1, 3-propane sultone product with the yield not lower than 95% and the purity reaching 99.9% or above and a sulfate byproduct with the purity reaching 99.6% or above can be obtained; no waste gas, waste solid or waste water is generated in the reaction process, the catalyst sulfite can be repeatedly used, and the used solvent is easy to recover and can be repeatedly used.

The invention belongs to the technical field of fine chemical engineering, and discloses hydroxypropyl crosslinked starch as well as a preparation method and application thereof. The preparation method of the hydroxypropyl crosslinked starch comprises the following steps: mixing starch and water to prepare starch milk; adding sodium phytate and urea; adding sodium sulfate and sodium hydroxide after cooling; adding epoxypropane for reaction; and adding sodium trimetaphosphate to react to prepare the hydroxypropyl crosslinked starch. The hydroxypropyl crosslinked starch prepared by the preparation method disclosed by the invention has excellent shear resistance, acid resistance and oxidation resistance.

The invention provides a chemical industry-oriented multi-scale multi-dimensional intelligent production scheduling method and system, and the method comprises the steps: obtaining various production scheduling related data based on a factory model, a production management system, an inventory management system, a sales management system and an equipment management system which are established in advance; performing production scheduling according to the various production scheduling related data, a predetermined production quantity standard and gross profit data of different products, and determining a production plan of a target time granularity; and carrying out production according to the production plan, obtaining order insertion data and / or production abnormal information in real time, and updating the production plan. At least efficient, collaborative and benefit-maximized production scheduling can be realized, multi-objective optimization, dynamic order insertion, multi-system data integration and real-time collaboration are supported, and the actual demand of the fine chemical industry field for efficient production scheduling is met.

The invention discloses a multi-dimensional data fusion analysis method and system for fine chemical production, and belongs to the technical field of industrial process control, and the method comprises the steps: obtaining multi-source production data, and generating a unified time sequence data set through timestamp alignment and redundant data filtering; extracting multi-scale features and fusing the multi-scale features and the process knowledge parameters into a joint feature vector; calculating a production state score and grade through weighted fuzzy reasoning; predicting a deviation trend of the key parameters based on the score and historical optimal production data; actual sampling data are obtained, deviation comparison is carried out on the actual sampling data and the deviation trend data, and optimization calculation is triggered to generate optimization control parameters; the reaction condition is adjusted through the distributed actuator, and the new data is used for updating the unified time sequence data set. According to the method, state evaluation is carried out by fusing process knowledge and multi-scale features, and deviation trend prediction and closed-loop optimization control are carried out in combination with the state transition probability, so that predictability, stability and adaptive optimization capability of the production process can be improved.

The present application relates to fine chemicals, and in particular to a method for preparing 2-imidazolidinone by using carbon dioxide. The method comprises reacting CO2 and ethylenediamine in the presence of inorganic sulfide to obtain 2-imidazolidinone. The method uses cheap and readily available sulfur-containing compounds as catalysts for activating CO2 for the first time, and converts ethylenediamine and CO2 into 2-imidazolidinone under relatively low temperature and supercritical conditions. Compared with the prior art, the reaction conditions of the present application are more simple and controllable, and do not require expensive and complex catalysts for post-processing, have the advantages of low energy consumption and low cost, and have extremely high popularization and application value.

Belonging to the technical field of fine chemical product separation and purification, the invention discloses a beta-bromophenylethane rectification purification process, which comprises the steps of system negative pressure pretreatment, falling film evaporation directional separation, structured packing layer gas-liquid mass transfer, precise reflux ratio regulation and control, segmented collection (front fraction-qualified product), and residual liquid treatment and system circulation. According to the process, the negative pressure of a system is stabilized at 800-1200 Pa, the material temperature of a falling film evaporation discharging end is controlled at 125-135 DEG C, the feeding flow is stabilized at 1.8-2.2 m / h, the reflux ratio is regulated and controlled at 0.8: 1-1.2: 1, and the process realizes efficient purification of beta-bromopheny ethane through precise negative pressure control, synergistic linkage of falling film evaporation and a rectifying tower, segmented material collection and a circular treatment mechanism, so that the process is suitable for industrial production of beta-bromopheny ethane. According to the method, the purity of beta-bromopheny ethane can stably reach 99.5% or above, the material recovery rate is increased to 92% or above, energy consumption is reduced by 15-20% compared with that of a traditional process, material thermal decomposition loss is avoided, and the method is suitable for industrial large-scale production.

The invention provides a crystallization kettle for producing a polyfluorobiphenyl liquid crystal monomer, and relates to the technical field of fine chemical equipment, the crystallization kettle comprises a crystallization kettle main body, the crystallization kettle main body comprises a crystallization kettle body, the bottom end of the crystallization kettle body is communicated with a discharge interface, the top end of the crystallization kettle body is provided with a crystallization kettle cover, the crystallization kettle cover is communicated with an optional connecting pipe, and the optional connecting pipe is connected with the discharge interface. A stirring mechanism is arranged on the crystallization kettle cover, the stirring mechanism comprises a stirring motor, the stirring motor is mounted on the crystallization kettle cover, an instantaneous concentration mechanism and a floating mechanism are arranged in the crystallization kettle body, the instantaneous concentration mechanism comprises a liquid passing pipe, the liquid passing pipe is mounted in the crystallization kettle body, and the floating mechanism comprises a circular truncated cone shell. The crystallization kettle for producing the polyfluorobiphenyl liquid crystal monomer can enable the temperature and the stirring speed to automatically adapt to different stages of crystallization, and has the advantages of high crystallization efficiency, high crystallization quality and high crystallization yield.

The application belongs to the field of fine chemical industry and environmental protection, and particularly relates to a method for preparing metal triflate by using high gravity reaction. The method comprises the following steps: 1, using trifluoromethylsulfonyl chloride and anhydrous HF gas as raw materials to generate trifluoromethylsulfonyl fluoride gas; 2, performing gas-liquid contact reaction of the trifluoromethylsulfonyl fluoride gas with an alkali metal solution to obtain a mixed solution; 3, performing solid-liquid separation on the mixed solution by using a filter press, and the liquid phase is a triflate salt solution; 4, drying the triflate salt solution by using a spray dryer to obtain a solid-phase product triflate salt. The method uses trifluoromethylsulfonyl chloride and anhydrous HF as raw materials to replace triflic acid in the traditional method, and utilizes high gravity reaction, so that the production cost is greatly reduced. The process is simple, the obtained product triflate metal salt has low impurity content, is superior to the industry standard, the process is zero emission, and has good economic value and social value.

The invention relates to the technical field of fine chemical engineering, in particular to a method and a system for continuously preparing p-phenylenediamine, the method for preparing p-phenylenediamine comprises the following steps: in an organic solvent, in the presence of a composite nickel-based molecular sieve catalyst, carrying out chlorination reaction on terephthalamide and chlorine, and after the reaction is finished, filtering, washing and drying to obtain p-phenylenediamine. Separating the composite nickel-based molecular sieve catalyst to obtain a reaction solution containing N, N '-dichloro terephthalamide; the composite nickel-based molecular sieve catalyst comprises an active component NiO, a carrier SiO2, a carrier Al2O3, an auxiliary agent Fe2O3 and a metal alkaline substance, the method comprises the following steps: carrying out rearrangement reaction on a reaction solution containing N, N '-dichloro-terephthalamide and an alkali solution, and after the reaction is finished, carrying out post-treatment to obtain p-phenylenediamine. The method has the remarkable advantages of high reaction efficiency, high product purity, low energy consumption, intrinsic safety and environmental friendliness, and a new process is provided for production of p-phenylenediamine.

The application belongs to the technical field of fine chemical industry, and particularly relates to a cationic microemulsion water-repellent quick-drying agent and a preparation method and application thereof. The cationic microemulsion water-repellent quick-drying agent is prepared by using Arquad 2C-75 (dicoconut alkyl dimethyl ammonium chloride) as a core cationic component, compounding refined white oil, matching a surfactant, a coupling agent and deionized water to construct a microemulsion system, mixing an oil phase, preparing a water phase, primary emulsifying, high-pressure homogenizing and post-treating. The product prepared by the application has a contact angle greater than 110 degrees, a sliding time shortened by more than 31.4%, is stable without precipitation in the range of-10 DEG C to 50 DEG C, has a viscosity less than 100 cP and can be dissolved and used immediately, is compatible with an anion system, has no ethanol / toluene solvent, VOCs detection meets the limit value of GB38508-2020, and has excellent performance in water-repellent quick-drying on the surface of an automobile and a wide application range.

The utility model discloses a water circulation system of a chlorinated polyethylene device, and belongs to the technical field of fine chemical engineering. The system comprises a hot water pool and a cold water pool, the output end of the cold water pool is respectively connected with a jacket of a chlorination kettle, a jacket of a material waiting kettle, a drying system and a belt filter, the output end of heating steam is connected with the jacket of the chlorination kettle and the drying system, and the jacket of the chlorination kettle and the output end of the drying system are connected with the hot water pool. According to the utility model, the water resource at the jacket outlet of the chlorination reaction kettle is fully utilized.

The invention belongs to the technical field of fine chemical synthesis, belongs to a nonionic short fluorine chain surfactant, and relates to a preparation method of a fluorinated polyether surfactant. The preparation method comprises the following steps: reacting trimethylolethane with a hydrogen bromide acetic acid solution to prepare an intermediate 1; reacting the intermediate 1 in an alkaline environment without an organic solvent to prepare an intermediate 2; reacting the intermediate 2 with pentafluoropropanol under the action of potassium hydroxide and a catalyst 1 to prepare a fluorinated monomer; finally, the fluorinated monomer is subjected to ring opening polymerization under the action of an initiator and a catalyst 2, and the fluorinated polyether type surfactant is prepared. The method has the advantages of easily available raw materials, mild reaction conditions, simple synthesis, low cost, high yield and short fluorine chain of the product, can replace a long-chain fluorine-containing surfactant which is difficult to degrade, and can be used as an additive in the fields of photoresists, coatings, adhesives and the like. The surface tension can be obviously reduced, the surface defects of a coating can be reduced, and the appearance can be improved by adding a very small amount of the surface tension reducing agent.

The application discloses a preparation method of an indoline compound based on organic electrosynthesis, and belongs to the technical field of pharmaceutical chemical engineering and related chemistry. The method uses simple arylamine and halogenated olefin as raw materials, and prepares the indoline compound under the electrolysis of an electrode, so that green and efficient synthesis of the indoline compound is realized. The method has the advantages of low cost, high selectivity, mild reaction condition, good functional group compatibility, wide substrate range and environmental friendliness. The indoline compound is an important organic synthesis intermediate, and has a very wide application in the fields of fine chemical engineering and pharmacy. The preparation method has great application value and social and economic benefits.

This application discloses an acetaldehyde recovery device and method in the production of 1,3-butanediol, belonging to the field of fine chemicals. The device includes: a feed pump, a preheater, a distillation column, a falling film reboiler, a bottom circulating pump, a bottom cooler, a top primary condenser, a reflux ratio distributor, a top secondary condenser, a top product tank, a top transfer tank, a bottom product tank, a bottom transfer tank, a vacuum condenser, a vacuum pump inlet separator, a high vacuum unit, and a vacuum pump outlet separator. The horizontal condenser is directly installed at the top of the distillation column, giving it advantages such as simple structure, convenient operation, low pipeline loss, and high vacuum. A method for acetaldehyde recovery in the production of 1,3-butanediol using this device is also disclosed. Compared to existing technologies, this invention uses falling film evaporation combined with vacuum deep cooling, which avoids the thermal decomposition of 3-hydroxybutyraldehyde and achieves low-temperature, high-efficiency acetaldehyde recovery. It is suitable for continuous production.

The invention discloses a method for separating oil-rich coal into organic matter components with different condensation degrees based on hierarchical density, and relates to the technical field of coal processing layering. Under the action of external field driving force, non-overlapping density hierarchical components with different organic matter condensation degrees and heavy ash contents are quickly separated; the density of the high ash density component is greater than or equal to 1.6 g / cm; the density of the heavy organic component is greater than or equal to 1.4 g / cm and less than 1.6 g / cm; the density of the medium-light organic component is greater than or equal to 1.3 g / cm and less than 1.4 g / cm; the density of the light organic component is greater than or equal to 1.2 g / cm and less than 1.3 g / cm; the density of the light organic component is less than 1.2 g / cm < 2 >. According to the method, based on the organic structural characteristics of the oil-rich coal, accurate non-overlapping cutting of components with different organic condensation degrees of the oil-rich coal is realized by adopting physical external field force, so that the accuracy and repeatability of a layering result are ensured; and the oil-rich coal is efficiently and cleanly converted into high-added-value fine chemicals and high-end carbon materials.

The invention belongs to the field of fine chemicals and glass storage, and particularly relates to composite acid, a preparation method and a method for cleaning glass rainbow spots through the composite acid. The preparation method comprises the following steps: sequentially adding 3-5% of acetic acid, 0.1-0.2% of fatty alcohol-polyoxyethylene ether, 0.3-0.5% of disodium ethylene diamine tetraacetate, 0.5-1.5% of hydrofluoric acid, 1.5-3% of concentrated sulfuric acid and the balance of water to a proper amount of water, and uniformly mixing to obtain a composite acid; the method comprises the following steps: completely immersing glass with rainbow spots in a thermal composite acid solution, taking out the glass, cleaning the glass until no composite acid solution is left, adding calcium carbonate into waste liquid after cleaning is completed, and discharging the waste liquid after the pH value of the waste liquid is qualified. The glass cleaning agent has an efficient and comprehensive decontamination effect on glass rainbow spots, impurity ions difficult to remove are not introduced, and cleaned glass is high in light transmittance, low in haze and small in damage to a glass body.

The application relates to the technical field of fine chemicals, and discloses a method for preparing secondary alcohol by catalyzing alpha-olefin hydration. The method comprises the following steps: under the catalysis of a catalyst, performing an aldehyde amine condensation reaction on 1,3,5-tri-(p-formylphenyl) benzene and o-sulfonic acid p-phenylenediamine in a first organic solvent in an air-isolated condition, then sequentially performing washing and drying on the obtained reaction product to obtain a COF-HSO3 catalyst, and then under the catalysis of the COF-HSO3 catalyst, performing a hydration reaction on alpha-olefin in a second organic solvent and water. The method for preparing secondary alcohol by catalyzing alpha-olefin hydration has high alpha-olefin conversion rate and secondary alcohol yield.

The application relates to the technical field of organic compound synthesis, and particularly provides a preparation method of a cyclopropane compound. gem The dichloro compound is used as raw material, a piezoelectric material, a metal reducing agent and an additive are added under a nitrogen atmosphere, a mechanical grinding method is used for reaction, and the reaction solution is subjected to post-treatment to obtain the cyclopropane compound. The method is simple in operation and mild in conditions, the raw material and reagent are cheap and easy to obtain and environment-friendly, a large amount of solvent or a high-cost catalyst does not need to be used, and the conversion can be successfully realized. In addition, the preparation method has good yield and functional group tolerance, is suitable for scale-up production, has a good industrial application prospect, and can be widely used in the fields of medical raw materials, intermediates and fine chemical synthesis.

The utility model provides a stacking device for fine chemical production, which relates to the technical field of chemical equipment, and comprises a rectification main body, a tower plate structure is arranged in the rectification main body, the tower plate structure comprises a first tower plate, a second tower plate is arranged on one side of the first tower plate, a third tower plate is arranged on one side of the second tower plate, and the third tower plate is arranged on the other side of the second tower plate. A first connecting opening is formed in one side of the first tower plate, a second connecting opening is formed in one side of the second tower plate, and a fixing groove is formed in the outer surface of the first connecting opening. According to the utility model, the tower plate structure is arranged, so that the tower plates which are originally arranged into a whole are conveniently divided, specifically, the first tower plate, the second tower plate and the third tower plate which are equal in width are arranged, and the first connecting port and the second connecting port are arranged and are used for connecting the two tower plates; the joint of the second tower plate and the third tower plate is provided with the same clamped connection port, and the fixed groove and the threaded groove are arranged to serve as the connection point between the tower plates.

The present application belongs to the field of computer and chemical cross-disciplinary multi-monitoring point monitoring abnormality detection, and proposes an abnormality detection method for fine chemical production process, an abnormality recognition intelligent agent model is randomly sampled in the data set and obtains the current state, the abnormality recognition intelligent agent model gives the action according to the current state; the reinforcement learning training environment returns the most abnormal next time state according to the data set, and takes the next time state as the input of the abnormality recognition intelligent agent model at the next time step; the reinforcement learning training environment gives the corresponding reward according to the judgment of the abnormality recognition intelligent agent model on the data; the abnormality recognition intelligent agent model learns the network weight according to the neuron, and obtains the optimal network weight of the abnormality recognition intelligent agent model for abnormality detection. The method of the present application firstly combines the pulse neural network with the deep reinforcement learning to complete the abnormality detection task in the chemical production scene, and has low detection power consumption and wide use scene.

This invention relates to the field of fine chemical technology, specifically disclosing a production process for electronic-grade diethyl carbonate. The method includes the following steps: ethylene carbonate and anhydrous ethanol undergo a transesterification reaction in a microwave reactor catalyzed by a composite catalyst; the reaction solution is then subjected to phase separation treatment, followed by a continuous separation process coupling atmospheric and vacuum distillation to obtain an intermediate; further purification is achieved by molecular sieve adsorption to remove metal impurities and moisture, combined with precision filtration using a polytetrafluoroethylene membrane. The composite catalyst significantly improves the transesterification reaction efficiency and product selectivity. This process, through the synergistic effect of reaction process enhancement and multi-stage purification technology, achieves highly efficient removal of moisture, metal impurities, and nanoscale particles from the reaction system. The resulting electronic-grade diethyl carbonate meets the stringent requirements of high-end electronic chemicals such as lithium battery electrolytes, and possesses technical advantages such as short reaction cycle, thorough impurity removal, and high product purity.

The invention relates to the technical field of flat gate valves, and discloses a flat gate valve convenient to screw, which comprises a gate valve shell, a channel is formed in the gate valve shell, a mounting bin is mounted at the upper end of the gate valve shell, an adjusting assembly is arranged in the mounting bin, and a lifting assembly is connected to the lower end of the adjusting assembly. Auxiliary positioning assemblies are arranged on the two sides of the lifting assembly. According to the flat gate valve convenient to screw, the opening and closing speed of the gate valve can be accurately controlled through the adjusting assembly by selecting a proper bevel gear combination, then the flow of fluid is accurately controlled, the strict requirements for technological parameters in fine chemical industry production are met, and operation is easier and more convenient; the gate is stably driven to move up and down, and the opening degree of the gate is accurately controlled, so that the flow of a medium is accurately adjusted, the fault probability of the valve is reduced to a certain extent, and the operation stability of the gate is guaranteed.

The invention relates to the technical field of perfluoro fine chemical engineering, in particular to a method for preparing a perfluoro organic carboxylic acid compound from perfluoro organic carboxylic ester, and particularly relates to a method for preparing a reactive perfluoro organic carboxylic acid compound from perfluoro organic carboxylic ester. The method comprises the following steps: carrying out hydrolysis reaction on perfluorinated organic carboxylate and an alkaline aqueous solution to generate a perfluorinated organic carboxylate solution, drying the generated perfluorinated organic carboxylate solution, preparing a perfluorinated organic carboxylate aqueous solution again, and carrying out ion exchange with hydrogen-type cation exchange resin to convert the perfluorinated organic carboxylate aqueous solution into a perfluorinated organic carboxylic acid aqueous solution. And performing post-treatment on the perfluorinated organic carboxylic acid aqueous solution to obtain the perfluorinated organic carboxylic acid compound. The preparation process of the method does not involve organic solvents such as sulfuric acid, hydrochloric acid and other acidic solutions, and the method has the advantages of simple operation, stable process, high product purity, safety, short reaction time, high yield and the like.

The invention belongs to the technical field of petrochemical engineering and fine chemical engineering separation, and discloses a method and device for separating alpha-olefin and isomers thereof by using metal-based ionic liquid and application, and the method comprises the following steps: mixing a raw material solution containing target alpha-olefin with an extraction agent; performing liquid-liquid extraction; after standing and layering, respectively collecting an extraction phase and a raffinate phase; components in the extraction phase and the raffinate phase are qualitatively and quantitatively analyzed, and the partition coefficient, the separation selectivity and the purity are evaluated; and analyzing the target alpha-olefin in the extraction phase, and recovering through a reduced pressure rotary evaporation process. According to the method, the metal-based ionic liquid with dual effects of pi-complexation and spatial recognition is introduced as the extraction agent, so that high-selectivity recognition and enrichment of the target normal alpha-olefin are realized, interference of internal olefin, branched olefin and saturated isoparaffin is effectively inhibited, and the purity and selectivity of the target component are remarkably improved.

The application belongs to the technical field of inorganic fine chemical phosphate purification, and provides a high-purity trisodium phosphate and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a trisodium phosphate saturated crude slurry; (2) adjusting the quality of the slurry: after the trisodium phosphate saturated crude slurry is warmed, it is placed and kept warm; (3) purification: the temperature of the adjusted slurry is controlled and kept; then, anhydrous trisodium phosphate homologous slow-release seeds are added into the slurry; the system supersaturation is adjusted in two stages; the stirring is stopped to perform normal-pressure static crystal growth, and the purified slurry is obtained; and (4) post-treatment. The prepared high-purity trisodium phosphate has extremely low impurity contents of heavy metals and anion by-products, and has regular crystal morphology and strong crystal form stability, and is not prone to problems such as caking and hydrolysis during storage.

The invention belongs to the field of fine chemical engineering and the technical field of low-temperature co-fired ceramics, and discloses inner electrode copper paste for low-temperature co-fired ceramics as well as a preparation method and application of the inner electrode copper paste. The method comprises the following steps: adding ascorbic acid, polyethylene glycol and polyvinylpyrrolidone into ethanol, carrying out oil bath stirring to obtain an organic coating solution, and then adding copper powder to prepare copper powder coated with a polyvinylpyrrolidone film; the preparation method comprises the following steps: preparing mixed powder from silicon dioxide, boric acid, calcium carbonate, sodium carbonate, potassium carbonate and copper oxide, sintering at 1200-1500 DEG C to prepare molten glass, and carrying out water quenching on the molten glass to obtain borosilicate glass powder; mixing a solvent, a binder, a thixotropic agent, an additive A and the like to prepare an organic carrier; and magnetically stirring the copper powder coated with the polyvinylpyrrolidone film, the glass powder, the organic carrier and the additive B, and grinding and leveling by using a three-roller mill to obtain the inner electrode conductive copper paste. The conductive copper paste prepared by the method has the performance of preserving heat for a long time at a relatively high temperature, and is good in printing performance and excellent in conductivity.

The application relates to the technical field of fine chemical industry, in particular to a circulating reaction device and a method for preparing sodium 3,3',4,4'-biphenyltetracarboxylate by using the same. The circulating reaction device comprises: a batching kettle, a discharging pipeline and a circulating pipeline are arranged on the batching kettle; a reaction unit, an inlet pipeline and an outlet pipeline are arranged on the reaction unit; the inlet pipeline is communicated with the discharging pipeline; the outlet pipeline is communicated with the circulating pipeline; a filler area is arranged in the reaction unit; the fillers of the filler area at least comprise a catalyst; a pump is arranged on the inlet pipeline; a qualified reaction liquid kettle, a qualified liquid inlet pipeline is arranged on the qualified reaction liquid kettle, and the qualified liquid inlet pipeline is communicated with the outlet pipeline; a washing liquid kettle, a washing liquid first pipeline and a washing liquid second pipeline are arranged on the washing liquid kettle, the washing liquid first pipeline is communicated with the outlet pipeline, the inlet pipeline is communicated with the washing liquid second pipeline, and the washing liquid kettle is used for containing washing liquid for washing the catalyst. The application can effectively improve the reaction conversion rate, realize automatic production and improve the production efficiency.

The present application belongs to the technical field of fine chemical industry, and relates to a recycling method of accelerator M tar. In the waste M tar produced in M production, a catalyst is added, high-temperature decomposition is carried out under nitrogen protection, and recycled raw materials aniline, carbon disulfide and intermediate benzothiazole and the like are obtained, most of which are recycled. The present application adopts common equipment and unit operations, the catalyst can be reused, and the treatment of production waste is easy to realize industrial production.