329results about How to "Efficient process" patented technology

The invention discloses a big language model tool matching method and system based on a knowledge graph, belongs to the technical field of artificial intelligence, and solves the problem that an API (Application Program Interface) tool is difficult to efficiently manage and accurately select in a real-time information processing process of an existing big language model. According to the method, a multi-source data fusion technology is introduced to collect and sort information of external API tools of different data sources, and a dynamic relation weight adjustment mechanism is utilized to dynamically adjust the weight of the relation between different API nodes according to the actual use condition of the API tools and user feedback; representing the characteristics of each API node through a graph embedding technology based on an intelligent matching algorithm of deep learning, and calculating the matching degree of each candidate API and a request by using a sequence processing model; according to the method, the knowledge graph and the intelligent matching algorithm are combined, an external API tool used by a large language model can be dynamically managed and optimized, and the information processing accuracy and the system response speed are improved.

The invention discloses a zinc negative electrode protective layer material of an aqueous zinc ion battery as well as a preparation method and application of the zinc negative electrode protective layer material. The method comprises the following steps: dispersing a carbon material in an acidic liquid, stirring at room temperature, and fully mixing to obtain a uniform suspension; adding manganese salt into the mixed solution, stirring at room temperature, and then performing constant-temperature water bath; washing, centrifuging, drying and calcining a product obtained by the reaction to obtain expanded graphite; uniformly dispersing expanded graphite in a solvent, and stirring to obtain a dispersion liquid; adding a titanium-containing organic compound into the dispersion liquid and stirring; adding deionized water into the dispersion liquid and refluxing; and centrifuging, washing, drying and calcining to obtain the protective layer. According to the composite material, expanded graphite is prepared firstly, and then titanium dioxide quantum dots are anchored on the expanded graphite. Due to excellent zinc ion rate, compared with the prior art, the material has lower interface resistance and good cycling stability and rate capability, and the problems of interface dendritic crystal growth and the like are solved.

The invention provides an automatic SRAF exposure development suppression method and device, a medium, a program product and a terminal, and aims to optimize an SRAF placement area when an interference pattern is detected in an initial exposure pattern through a multi-round iterative optimization technical means, and when a new exposure pattern meets a preset termination condition, the iterative optimization operation is ended, so that the SRAF exposure development is suppressed. Therefore, the problems of time waste and flow complexity caused by redesigning the SRAF placement rule in the traditional method are solved. According to the method, the original spatial position of the SRAF is kept, the enhancement effect on the resolution of the main graph is guaranteed to the maximum extent, and the definition and precision of the graph are improved, so that the production efficiency is improved, the manufacturing process is simplified, and a more convenient solution is provided for practical application.

The invention discloses a cleaning method, a cleaning system and application of a precision filter. The cleaning method comprises the following steps: roughly cleaning the emptied precision filter by adopting an organic solvent; washing the roughly washed precision filter with water to elute the organic solvent; after washing, draining washing water in the precision filter to enable the precision filter to be filled with water, and heating to perform deep hydrolysis treatment on gel impurities attached in the precision filter; after the deep hydrolysis treatment is completed, completely discharging decomposition liquid in the precision filter; and washing with water and drying to complete cleaning of the precision filter. According to the cleaning method, deep decomposition treatment is conducted with water to replace an existing alkali washing procedure, efficient decomposition of GPAN can be achieved, the cleaning effect is good, the solid waste generation amount is small, and corrosivity is small. The invention further improves the process of deep decomposition treatment with water, provides a backflow self-circulation deep decomposition treatment process and a forced circulation deep decomposition treatment process, and further improves the cleaning effect.

The invention relates to the technical field of hydroelectric generators, in particular to a three-dimensional flow field load reconstruction method based on reinforcement learning of a gated circulation unit, which comprises the following steps of: establishing a Python-based finite element secondary development platform, and realizing finite element simulation and obtaining a finite element simulation result; fusing a plurality of simulation characteristic indexes extracted from the finite element simulation result by using a multi-scale model fusion algorithm to obtain a finite element simulation result evaluation index, and optimizing simulation parameters; constructing an initial three-dimensional flow field load reconstruction model based on reinforcement learning of a gated circulation unit, and training the initial three-dimensional flow field load reconstruction model by using the optimized simulation parameters; and based on the trained three-dimensional flow field load reconstruction model, obtaining a reconstructed three-dimensional flow field load. By means of the reconstruction method, automatic simulation of finite element software and full-automatic optimization iteration of a parameter decision and reinforcement learning reconstruction network in the three-dimensional flow field load reconstruction process of the hydroelectric generating set component can be achieved.

The invention provides multi-section wastewater treatment equipment for photocatalytic degradation, and belongs to the technical field of wastewater treatment. Comprising a pretreatment device, a photocatalysis device, a separation and recovery device and a post-treatment device. By arranging the filter cartridge, the deformation ring, the conical filter screen, the arc-shaped top plate, an elastic sheet and a baffle ring II, after wastewater flows in from the water inlet, the arc-shaped top plate effectively disperses water flow, impurities are prevented from directly impacting the top of the conical filter screen to cause decomposition, and meanwhile, the arc-shaped top plate and the conical filter screen are driven to move downwards, so that the deformation ring forms a buffer inclined plane to further absorb impact energy; the filtering precision is greatly improved through double buffering; the deformation ring is linked with the baffle ring II through the connecting rope II, when wastewater flows in, the discharge hole is closed, impurity circulation is prevented, wastewater visibility is improved, photocatalytic degradation is enhanced, when the wastewater stops flowing in, the elastic piece resets the deformation ring, the baffle ring II is driven to open the discharge hole so that impurities can be discharged along with the treated wastewater, and filtering precision and photocatalytic degradation efficiency are improved; stable and efficient operation of the system is guaranteed.

The invention particularly relates to a gas station oil gas recovery online monitoring system, method and device and a medium, the monitoring system comprises a sensor network, an edge controller and a cloud computing monitoring platform, and the sensor network is used for collecting working parameters at key nodes in the oil gas recovery process. And the edge controller is used for performing preliminary data processing based on the working parameters to obtain oil gas recovery performance parameters and refueling equipment early warning information. And furthermore, the cloud computing monitoring platform is used for acquiring the oil gas recovery performance parameter sent by each edge controller in the gas station, and performing multi-dimensional data analysis based on each oil gas recovery performance parameter to obtain an oil gas recovery multi-dimensional monitoring result. By executing multi-dimensional data analysis, abnormal conditions in the oil and gas recovery process can be found and fed back in time, efficient oil and gas recovery work is ensured, meanwhile, potential fault points can be recognized in advance, the downtime and maintenance cost caused by faults are reduced, and the stability and reliability of the oil and gas recovery process are improved.

The invention relates to the technical field of infrared optical materials, and particularly discloses a large-size high-resistance infrared silicon single crystal and a preparation method thereof. The doping concentration of cobalt oxide in the large-size high-resistance infrared silicon single crystal is 10 ppm to 100 ppm, and the atomic concentration of phosphorus in the large-size high-resistance infrared silicon single crystal is 2 * 10 < 13 > / cm < 3 > to 6 * 10 < 13 > / cm < 3 >. The oxide of transition metal cobalt and phosphorus impurities are doped into the infrared silicon single crystal, carriers of cobalt and phosphorus and carriers of impurities such as boron and oxygen generate a recombination effect, so that the concentration of free carriers in the silicon single crystal is reduced, and the absorption coefficient of the doped silicon single crystal is relatively small; the infrared transmittance of the silicon single crystal in a medium wave band can be obviously increased, the resistivity can reach 600 omega.cm or above, and the use requirement of the infrared silicon single crystal in a high-performance infrared optical system can be met.

The invention discloses a preparation method of a sodium alginate fiber biological material fiber with a hollow structure and a sodium alginate fiber.The preparation method comprises the following steps that 101, CaCl2 particles are dissolved in deionized water and fully stirred, and a CaCl2 / H2O core layer spinning solution is prepared; step 102, dissolving sodium alginate in deionized water, heating to improve the solubility of the sodium alginate in the deionized water, and fully stirring to obtain an SA / H2O cortex spinning solution; and step 103, respectively extruding the SA / H2O skin layer spinning solution and the CaCl2 / H2O core layer spinning solution into a CaCl2-removed coagulating bath through a coaxial needle at the speeds of 200 [mu] L.min <-1 > and 200 [mu] L.min <-1 >, and aging to obtain the hollow fiber. According to the preparation method, a coaxial spinning process is adopted, and the problems of fluid fracture and the like caused by drafting instability can be effectively avoided. Hollow fibers are used for replacing solid rod-shaped fibers, the process is efficient, convenient, energy-saving and environment-friendly, the experiment repeatability is high, a high-voltage electric field and toxic substances are not involved in the preparation process, and damage to biological tissues is avoided.

The invention discloses an intelligent operation and maintenance management system, and relates to the technical field of system operation and maintenance management, the intelligent operation and maintenance management system comprises a data acquisition module, a data processing module and a data analysis module, the data acquisition module collects performance data from a network device, a Windows server and an application program by using a simple network management protocol, a WMI interface and an API interface, and the data processing module processes the performance data and analyzes the performance data. The data processing module is used for establishing a unified technical monitoring standard and realizing comprehensive real-time monitoring and data analysis of a technical environment by utilizing an autoencoder anomaly detection algorithm, and rapidly finding and responding to anomaly and fault, so that the technical environment is monitored and monitored in real time; and the data analysis module is used for setting an intelligent alarm and early warning rule based on an abnormal detection result, immediately sending out early warning information once a problem is detected, and presenting an analysis result in a graphical mode, so that operation and maintenance personnel are assisted to intuitively understand a system state and an operation and maintenance effect, and efficient operation and maintenance work is ensured.

The invention provides an ultraviolet disinfection device for producing nursing pads, which relates to the technical field of ultraviolet disinfection, and comprises a disinfection box, wherein a central column is fixed at the inner center of the disinfection box, a feeding inlet is opened on one side of the disinfection box, and a feeding outlet is opened on the other side of the disinfection box, and a conveyor belt is arranged outside the feeding inlet and the feeding outlet of the disinfection box, a nursing pad body is placed on the surface of the conveyor belt, and a pushing assembly is arranged on the top of the conveyor belt on one side of the feeding outlet. Compared with the prior art, the nursing pad for feeding inlet is clamped by a translation assembly and a clamping assembly, and is transformed from a planar shape to a vertical shape, and circulates around the annular disinfection box, and the two sides of the nursing pad are irradiated by ultraviolet lamp columns on the inner wall of the disinfection box and the outer wall of the central column to improve the disinfection effect, and then the nursing pad is sent out from one side of the feeding outlet. The overall process is efficient, with less human intervention, and is suitable for cyclic disinfection in a production workshop.

The invention belongs to the technical field of conveying devices, and particularly relates to a stable conveying device for automobile part machining, the stable conveying device comprises two supporting plates, the side walls of the sides, away from each other, of the two supporting plates are fixedly connected with supporting frames, and the same driving roller is rotationally connected between the two supporting plates; the driving roller is in transmission connection with a power source, the tension adjusting assembly is located on the side walls of the two supporting plates and connected with the driven roller, and the driven roller and the driving roller are sleeved with the same belt. When the tension of the belt of the conveying device is changed due to abrasion, the abrasion degree of the belt can be automatically and regularly detected, when it is detected that the abrasion of the belt is serious, an operator can be reminded to replace the belt, the operator does not need to manually detect the belt, and the working efficiency is improved. And the workload of operators is reduced.

The embodiment of the invention provides a public opinion information recommendation method and device, a storage medium and a terminal, and the method comprises the steps: obtaining one or more pieces of public opinion information related to a target public opinion theme to form a public opinion information set after the target public opinion theme is determined; obtaining one or more of correlation dimension information, source dimension information and propagation dimension information of each piece of public opinion information in the public opinion information set; and according to the scoring rule corresponding to each piece of dimension information, determining the score of each piece of dimension information, and calculating the value score of each piece of public opinion information in combination with the weight of each piece of dimension information. And performing public opinion information recommendation according to the value score sequence of all public opinion information in the public opinion information set. By applying the method, the public opinion information can be automatically analyzed and screened from multiple dimensions, the efficiency and authority of public opinion information acquisition are improved, and real-time updating is supported, so that enterprises or governments and the like can acquire the latest public opinion information in real time and quickly take countermeasures, and potential business risks are avoided.

The invention discloses a method for preparing beryllium-copper master alloy by recycling waste beryllium materials, and belongs to the technical field of beryllium-copper alloy, the method comprises the following steps: S1, sequentially carrying out acid pickling, water washing, ultrasonic cleaning, spin-drying and drying on waste beryllium chips and beryllium-copper leftover materials; s2, according to the beryllium content in the beryllium-copper master alloy, weighing the dried beryllium scraps and beryllium-copper leftover materials, and putting the beryllium scraps and the beryllium-copper leftover materials into a cake pressing machine for pressing to obtain columnar materials; and S3, the columnar material is placed in a copper crucible in a vacuum suspension smelting furnace, and water cooling, vacuumizing, argon filling, power regulation and control smelting, staged cooling, vacuum breaking and surface cleaning are sequentially carried out. The beryllium-copper master alloy prepared through the method is stable in beryllium content control and low in impurity content, recycling of beryllium waste and beryllium-copper leftover materials is achieved, and the production cost of the beryllium-copper alloy is reduced.

The invention relates to a method for improving the activity of heavy magnesium oxide. According to the method, through the fine process steps of secondary cold water stirring, secondary time and temperature adjustment drying, primary calcination and the like, the activity of the heavy magnesium oxide is remarkably improved under the condition that the bulk density, the granularity and the crystal structure of the heavy magnesium oxide are not affected, and the active CAA value is increased from 500 seconds or above to 10 seconds to 185 seconds. In the whole preparation process, through reasonable selection of raw materials and accurate control of reaction conditions, high activity and excellent filling performance of magnesium oxide are realized, and finally, a high-performance magnesium oxide product suitable for various industrial applications is obtained. The method has the characteristics of simple process, environmental protection, high efficiency and low energy consumption, is especially suitable for large-scale production, and has wide application prospects in cobalt precipitation, sewage treatment and other industrial fields.

The invention relates to the field of stacking and sorting, in particular to a multi-specification product mixed unstacking and intelligent sorting device based on three-dimensional visual guidance, which comprises a sorting robot, the sorting robot is provided with a mounting frame arranged at the driving end of the sorting robot and an adsorption assembly arranged on the mounting frame, and the periphery of the mounting frame is provided with an identification camera; the anti-interference mechanism comprises a curtain blocking assembly capable of blocking stacks and a distance adjusting assembly used for adjusting the distance between the curtain blocking assembly and the stacks, the curtain blocking assembly comprises a fixed part, a movable part and a curtain fixedly connected between the fixed part and the movable part, and the distance adjusting assembly is used for adjusting the distance between the curtain blocking assembly and the stacks. The sucked stacks are surrounded by the four curtains, so that a space for shielding the stacks in the space is formed, external light and other factors possibly interfering the identification process are effectively isolated, then the stacks are shot through the identification cameras on the periphery of the stacks, and the specific specification of the stacks is accurately judged.

The invention relates to the field of water treatment and wastewater resource recovery, in particular to a resourceful treatment method for magnesium sulfate wastewater in rare earth smelting. The method comprises the following steps: adding precipitant slurry and magnesium sulfate wastewater into a base solution for reaction to obtain mixed slurry containing calcium sulfate; and separating the mixed slurry containing calcium sulfate to obtain calcium sulfate crystals, magnesium hydroxide and recycled liquid. The invention provides a low-cost resourceful treatment method for rare earth smelting magnesium sulfate wastewater. The simple one-step precipitation process is adopted, the cost is superior to that of an existing magnesium sulfate wastewater evaporative crystallization treatment process, meanwhile, the reaction process is one-step precipitation, and the process is superior to that of a multi-step precipitation resourceful treatment magnesium sulfate wastewater process. The calcium sulfate crystal obtained by the method is large in size and easy to separate from magnesium hydroxide, the magnesium hydroxide and the calcium sulfate crystal with higher purity are recovered, and resource recycling of the magnesium hydroxide, the calcium sulfate crystal and the recycling liquid is realized.

The invention discloses PCB (printed circuit board) through hole plugging resin which is prepared from the following raw materials in parts by weight: 35-100 parts of epoxy resin composition, 5-15 parts of curing agent, 1-10 parts of curing accelerator and 0.1-5 parts of assistant. By adopting the combination of the bisphenol A epoxy resin, the bisphenol F epoxy resin and the trifunctional epoxy resin, the prepared hole plugging resin is easy to plug holes, not easy to sag and excellent in hole plugging performance. The thermosetting resin composition is used for permanently filling the through hole in the printed circuit board, has the properties of low viscosity, easiness in hole filling, good sagging resistance and high glass transition temperature, not only can meet the requirements of an existing vacuum hole filling machine, but also can meet the hole filling requirements on high efficiency and high cost performance in a complex printed circuit board.

The invention discloses a quartz fiber with an yttrium oxide coating and a preparation method of the quartz fiber, and belongs to the field of preparation of wave-transparent ceramics. Aiming at the problem that the performance of the existing quartz fiber is reduced at a high temperature, the invention provides the preparation method of the quartz fiber with the yttrium oxide coating, which comprises the following steps: impregnating the quartz fiber by using yttrium oxide sol, and drying and sintering the impregnated quartz fiber to obtain the quartz fiber coated with the yttrium oxide coating on the surface; the preparation process of the yttrium oxide sol comprises the following steps: sequentially adding a coordination agent and a stabilizer into a yttrium nitrate solution, stirring and dissolving to form a mixed solution, adding a pH regulator to adjust the pH value of the mixed solution to 7-8, heating to a target temperature, and cooling to obtain the yttrium oxide sol. The yttrium oxide coating covers the surface of the quartz fiber, so that the high-temperature sintering resistance of the quartz fiber can be greatly improved; the preparation process of the yttrium oxide sol is simple in technology and low in cost, the prepared yttrium oxide sol is good in stability and can be better attached to the surface of the quartz fiber, and the dipping effect is improved.

The invention discloses a support for overhauling a vertical motor in the technical field of vertical motor overhauling, and the support comprises a supporting assembly, an adjusting assembly arranged in the supporting assembly, and a power assembly arranged on one side of the supporting assembly. A worker can conveniently enter the position below the vertical motor to conduct maintenance and replacement, the safety of the worker is guaranteed, meanwhile, in cooperation with movement of an adjusting assembly and a power assembly, the device is matched with vertical motors of different models and sizes, and the practicability of the device is enhanced. The supporting block is driven to rotate through the connecting wheel and the first rack, so that vertical motors of different sizes are supported, a worker has enough working space below the vertical motors through the bottom plate and the vertical plate, operation is convenient, and the tool is simple in structure, convenient to use, easy to operate, high in efficiency, excellent in working procedure and convenient to manufacture.

The invention relates to the field of terminal control, in particular to an angle measurement method and device and a storage medium. The angle measurement method provided by the invention is applied to first reference equipment, and comprises the following steps: based on communication connection between target equipment and second reference equipment, determining a plurality of phase measurement values of signal interaction between the target equipment and each reference equipment under a plurality of signal frequencies; based on the plurality of phase measurement values, respectively determining a signal phase change estimation value corresponding to each signal frequency, and obtaining a plurality of signal phase change estimation values; determining a distance difference between the target device and the two reference devices based on the plurality of signal phase change estimated values; and determining deflection angles between the target equipment and the two pieces of reference equipment based on the baseline length and the distance difference between the two pieces of reference equipment. The purpose of high-precision angle measurement can be achieved under the condition that other measurement sensors do not need to be added.

The invention relates to the technical field of phosphorus chemical solid waste treatment, and particularly discloses a reverse-direct flotation desilicication and impurity removal combined process for phosphogypsum. According to the process, C12-18 alkyl dimethyl ethyl benzyl ammonium chloride is used as a reverse flotation reagent, a mixture of R-NH2 or hydrochloride thereof and R-OSO3Na according to a certain proportion is used as a direct flotation reagent, R in the direct flotation reagent is alkyl and is the same as the alkyl in the reverse flotation reagent, and through the one-reverse-one-direct flotation process, the content of the R in the reverse flotation reagent is reduced, and the content of the R in the reverse flotation reagent is reduced. And various impurities such as silicon, organic matters and fluorine in the phosphogypsum can be synchronously removed. After flotation, the yield of concentrate can reach 75%, the grade of CaSO4. 2H2O is 97.7% or above, and the desilicication rate reaches 75% or above. The method is simple in process, efficient and low in cost.

The present invention relates to the technical field of lamination processing, and discloses an OLED flipping and transfer structure, including an OLED flipping robot and an OLED loading and transferring component. By utilizing the OLED flipping robot and the OLED loading and transferring component, the OLED flipping robot is connected to the OLED loading and transferring component, and after the OLED flipping robot flips the OLED screen, the OLED loading and transferring component transfers the OLED screen, and the OLED screen is flipped and transferred between the OLED flipping robot and the OLED loading and transferring component, and the whole process is very efficient.

The invention relates to a copper-iron bimetallic Fenton-like catalyst and a preparation method and application thereof.The preparation method comprises the steps that copper salt, iron salt and gamma-Al2O3 are mixed in deionized water and stirred through a mechanical stirring rod, and a mixed steeping liquor is obtained; carrying out spray drying on the mixed impregnation liquid on a spray dryer, and preliminarily removing moisture to obtain a precursor of the copper-iron bimetallic Fenton-like catalyst; and calcining the precursor of the copper-iron bimetallic Fenton-like catalyst in a tubular furnace to obtain the copper-iron bimetallic Fenton-like catalyst. The catalyst provided by the invention has the characteristics of easy recovery, high catalytic activity and the like, and solves the problems of low catalytic efficiency of an iron-based catalyst and difficult recovery of a copper-based catalyst in the prior art.

The invention belongs to the field of heavy metal complex wastewater treatment, and particularly relates to a non-metal doped titanium-based metal monatomic electrode for decomplexing complex-state heavy metals and a preparation method and application thereof, the non-metal doped titanium-based metal monatomic electrode comprises a titanium substrate, and non-metal atoms and metal monatomic which are respectively loaded on the surface of the titanium substrate; the non-metal atoms are selected from one or more of phosphorus, boron and sulfur; the metal single atoms are selected from one or two of iron and cobalt. Compared with the prior art, the problems that in the prior art, an electrochemical anode material is poor in activity and insufficient in stability when breaking complex-state heavy metal are solved, the strong bonding interaction between an inherent oxide layer on the surface of the titanium-based material and a metal monatomic site is utilized, and metal monatomic is fixed to the surface of the material; meanwhile, nonmetal is introduced to regulate and control an electronic structure of metal, so that the metal site stability and decomplexing performance are improved.

The invention provides an electro-adsorption material for electrochemically extracting bromine as well as a preparation method and application of the electro-adsorption material. The electro-adsorption material comprises bismuth oxybromide nanosheets and poly (3, 4-ethylenedioxythiophene) loaded on the surfaces of the bismuth oxybromide nanosheets, and the mass ratio of the bismuth oxybromide nanosheets to the poly (3, 4-ethylenedioxythiophene) is (1-10): (0.1-5). The electro-adsorption material provided by the invention has relatively large adsorption capacity, good cycle stability and excellent selective adsorbability, still has adsorption capacity for a solution with the bromine ion content lower than 100mg / L, and is suitable for being applied to extraction of bromine from oilfield brine.

The invention discloses a fresh water ecosystem health monitoring method and system. The method comprises the following steps: acquiring a historical remote sensing image, and acquiring a physical index; acquiring historical ground measured data, and extracting chemical indexes and biological indexes; establishing a training set and a test set based on each index; a classification machine learning model is selected to construct a sub-model for each index, the training set is used as input for training, and a plurality of water quality evaluation sub-models are obtained; performing accuracy analysis on each water quality evaluation sub-model, calculating relevancy and stability between different models, and obtaining fusion weights of the corresponding water quality evaluation sub-models; combining all the water quality evaluation sub-models based on the fusion weight to construct a comprehensive water quality evaluation model; and performing fresh water ecological water quality evaluation through the comprehensive water quality evaluation model to generate an evaluation report. According to the invention, accurate evaluation of fresh water ecological water quality is realized by combining remote sensing and ground measured data.

The invention provides a whole-process continuous production system for an aliphatic epoxy diluent. The invention further provides a whole-process continuous production process of the aliphatic epoxy diluent. The invention further provides an aliphatic epoxy diluent which is prepared by the production process. According to the full-process continuous production system and process for the aliphatic epoxy diluent, through continuous process design and device optimization, the problems of high labor intensity and large product quality fluctuation in traditional intermittent method epoxy diluent production are effectively solved, the production efficiency and the product quality stability are improved, and the production cost is reduced. And the method has great application value and market competitiveness.

The invention provides a process and system for synthesizing a bismaleimide compound, and relates to the technical field of chemical synthesis, and the process comprises the following steps: (1) amidation reaction; (2) ring-closure dehydration reaction; (3) recovering the organic solvent; (4) a toluene thermal washing process; (5) a cooling crystallization process; (6) alkali washing process; (7) washing with hot water; and (8) drying. The process provided by the invention is high in production efficiency, the synthesized bismaleimide product is high in yield and purity, and compared with the prior art, the process is a clean production process in which the solvent can be recycled, no waste liquid is generated, the environment-friendly requirement is met, and the process has great environmental benefits, social benefits and economic benefits.

The invention discloses a method for extracting tobacco flavor components, which comprises the following steps: distillation-dry distillation, collection and elution recovery: the distillation-dry distillation comprises the following steps: adding tobacco into a dry distillation device, preheating the dry distillation device, introducing superheated steam into the dry distillation device, and collecting the tobacco flavor components; heating the dry distillation device until the temperature in the kettle is 100-450 DEG C so as to simultaneously perform distillation and dry distillation on the tobacco; the collection comprises collection of distillates distilled in the whole distillation-dry distillation process; the elution recovery comprises the following steps: adding ethanol into the distillate, placing the distillate in refrigeration equipment, carrying out alcohol precipitation, carrying out coarse filtration, and finally carrying out membrane filtration to obtain a solution containing tobacco aroma components. According to the method, the process steps are further optimized, so that the production process is simplified, meanwhile, the yield of the tobacco aroma components is increased, and the pollution to the environment is reduced.