711 results about "Chemical technology" patented technology

The invention provides a multi-modal characterization molecular property prediction method based on hierarchical bidirectional cross attention, and relates to the technical field of machine learning assisted organic chemistry, and the method comprises the following steps: S10, generating same-molecule multiple sequences for data enhancement; s20, coding the sequence features through a pre-trained molecular language model MolBERT; s30, performing multi-modal feature fusion through a layered bidirectional cross attention mechanism; s40, establishing a prediction head; s50, in the reasoning stage, only the feature extraction and fusion steps are executed, and a molecular property prediction result is output through the trained prediction head. According to the method, the molecular sequence, the topological graph structure and the fingerprint features are effectively integrated, so that the prediction precision of the model on a plurality of MoleculeNet (molecular network benchmark) public data sets is superior to that of an existing method.

The invention belongs to the technical field of chemical engineering, particularly relates to a preparation method and a preparation device of electronic-grade hexafluorobutadiene, and aims to provide a brand-new hexafluorobutadiene synthesis route which can fundamentally solve the bottleneck problem in the existing hexafluorobutadiene production or preparation method. According to the preparation method, chlorotrifluoroethylene is taken as a main raw material, and the electronic grade 4N hexafluorobutadiene meeting the application of the semiconductor industry is prepared through two steps of catalytic polymerization and finished product rectification. The process raw materials and the device are high in utilization rate, impurities such as heptafluorobutene and hexafluorocyclobutene which are difficult to purify do not exist, the quality of the produced finished product can be effectively guaranteed under the condition that the cost is low, and then the technology is more competitive.

The invention discloses an input-output method and system realized based on a calculation engine in the coal chemical industry, and relates to the technical field of coal chemical industry, and the method comprises the steps: building a molecular model based on a reaction network of a coal molecular structure, and updating the parameters of the molecular model in real time through extended Kalman filtering; constructing a data fusion layer through a hybrid modeling technology, and constructing a coal chemical industry residual learning architecture by using a mechanism model and a neural network series structure; evaluating a data-driven model prediction confidence interval according to a Monte Carlo method; a digital twin verification platform is constructed based on hardware-in-the-loop test, and a data-driven adaptive iteration mechanism is constructed through an online and offline collaborative updating mechanism. The method has the beneficial effects that the medium component fluctuation is accurately captured, the output accuracy is improved, reliable evaluation dependence is provided, and the real-time response force and long-term stability of the system in a complex environment are improved.

The invention relates to the technical field of chemical engineering, and discloses a trichlorosilane hydrogen reduction polycrystalline silicon growth monitoring system fusing multi-source data. Comprising a multi-sensor monitoring module, a multi-sensor data acquisition module, a multi-source data preprocessing module, a growth process data analysis module, a growth state online evaluation module, a process parameter online regulation and control module, a regulation and control result feedback module and a system collaborative management module, the multi-sensor monitoring module monitors the growth process of trichlorosilane hydrogen reduction polycrystalline silicon through multiple sensors, the multi-sensor data acquisition module acquires original data, the multi-source data preprocessing module preprocesses the data, the growth process data analysis module carries out data calculation, and the growth state online evaluation module carries out online comprehensive evaluation. The process parameter online regulation and control module regulates and controls process parameters online, the regulation and control result feedback module generates an adjustment strategy, and the system collaborative management module performs system parameter recording and storage, system optimization and exception handling.

The invention belongs to the technical field of degradation and recovery of high polymer materials, and discloses a subcritical hydrothermal catalytic degradation and recovery method of acid anhydride / glycidyl ether epoxy resin, which comprises the following steps: placing an anhydride / glycidyl ether epoxy resin sample and a nitric acid solution in a hydrothermal reaction kettle; raising the temperature through a program temperature control device and maintaining a constant-temperature reaction. The degradation rate of 80.6%-100% of the epoxy resin can be achieved through the hydrothermal degradation reaction. Compared with a traditional thermal cracking and supercritical fluid degradation process, the method has the advantages that an acidic degradation system without organic solvent addition and transition metal catalysis is innovatively constructed, and efficient degradation of an epoxy resin network structure is realized under the subcritical hydrothermal condition. The process has the characteristics of mild reaction conditions, relatively low energy consumption, environmental friendliness and the like, and provides a feasible chemical technical path for resourceful treatment of the anhydride cured glycidyl ether type epoxy resin waste.

The invention relates to a loop fixed bed reactor system, and relates to the technical field of chemical engineering, the loop fixed bed reactor system comprises a plurality of groups of primary loop reactors and a plurality of groups of secondary loop reactors, the primary loop reactors and the secondary loop reactors have the same structure, and the primary loop reactors and the secondary loop reactors are connected in series through reactor outlet pipelines; each primary loop reactor comprises a fixed bed reaction unit, a circulating pump and an external heat exchanger, the fixed bed reaction unit, the circulating pump, the external heat exchanger, an external heat exchanger inlet pipeline and the circulating pipeline assembly are communicated, and two or more groups of primary loop reactors and secondary loop reactors are connected in series through reactor outlet pipelines; through a forced circulation flow mechanism driven by the venturi gas-liquid mixer and the circulating pump, the problems of mixing mass transfer efficiency, internal heat transfer and retention time of a traditional fixed bed reactor are fundamentally solved, and exponential improvement of the mixing effect and the heat transfer effect is achieved through rapid circulation of the circulating pump and the venturi gas-liquid mixer.

The invention relates to the technical field of oilfield chemistry, in particular to a clay stabilizer containing dihydroxyl quaternary ammonium salt and a preparation method thereof, and the preparation method of the clay stabilizer containing dihydroxyl quaternary ammonium salt comprises the following steps: mixing required amounts of tetramethylethylenediamine, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride and a hydrogen bond donor for reaction to obtain the clay stabilizer containing dihydroxyl quaternary ammonium salt. And after the reaction is ended, obtaining the clay stabilizer containing the dihydroxyl quaternary ammonium salt. The clay stabilizer containing dihydroxyl quaternary ammonium salt is high in charge density and remarkable in clay expansion prevention effect; the fabric has the characteristic of multi-point adsorption and is high in washing resistance; the polymer is composed of small molecular weight compounds and can be used for transformation of low-permeability and ultra-low-permeability reservoirs. And meanwhile, the fracturing fluid has good compatibility with the fracturing fluid, the influence on the viscosity of the fracturing fluid is small, and the sand-carrying performance of the fracturing fluid can be guaranteed while reservoir protection is realized. The preparation method of the clay stabilizer containing the dihydroxyl quaternary ammonium salt is simple in process, easy to control and implement and suitable for industrial large-scale production.

The invention belongs to the technical field of chemistry, and particularly relates to a domestic nuclear-grade resin in-pile irradiation application index evaluation method. Comprising the following steps: confirming that pressure-resistant, temperature-resistant and oxidation-resistant tests have been carried out before domestic nuclear-grade resin enters a pile, and the test result is not lower than the index requirements of imported same-type resin; determining test preconditions, collecting water quality data at the inlet and outlet of the domestic nuclear-grade resin in-pile irradiation application test desalting bed during normal power operation, and determining corresponding resin bed operation parameters, unit operation states and resin replacement window time; desalting bed operation parameters and unit operation states in the domestic resin engineering application period are collected, and the water quality of a resin bed inlet and outlet and a connected system is regularly tracked according to a water quality sampling analysis scheme; after the test is finished, carrying out broken resin inspection on the resin trapper or the filter; and organizing related operation parameters and water quality indexes for comparative analysis. The invention provides a basis and a standard for the application of the domestic nuclear-grade resin in the nuclear power plant.

The invention discloses a high-salinity wastewater resource utilization method and device, belongs to the technical field of chemical engineering, and relates to wastewater treatment. The invention relates to a high-salinity wastewater resource utilization method which comprises the following steps: (1) deep removal of organic matters in a high-salinity system: realizing selective separation and removal of the organic matters in wastewater by using a synergistic effect of a flocculating agent and a catalyst; (2) mixed salt separation and recycling: realizing stable separation of sodium chloride and sodium sulfate through the design of MCR-nanofiltration-reverse osmosis multi-membrane coupling synergistic gradient coupling and reflux nesting; and (3) stable control of evaporative crystallization of a complex system: a scale inhibitor, humic acid and a defoaming agent are used, and fractional crystallization and purification are realized through high-temperature firing. According to the method, recycling circulating water can be saved, a large amount of sodium chloride and sodium sulfate are recycled as byproducts, COD and ammonia nitrogen are reduced, the recycling rate of sodium sulfate and sodium chloride is larger than 85%, and the water recycling rate is larger than 95%.

This invention belongs to the field of chemical technology and discloses a high-toughness, fracture-resistant foamed composite mat and its processing technology. The high-toughness, fracture-resistant foamed composite mat and its processing technology include a mat body with a thickness of 3-15 mm, comprising two or more soft elastic foam layers; at least one reinforcing layer is disposed between adjacent soft elastic foam layers. This high-toughness, fracture-resistant foamed composite mat and its processing technology solve the core problems of insufficient toughness and easy breakage when bent in existing PU foamed yoga mats, crawling mats, and other similar products: through the structure of the PU foam layer and the reinforcing layer interlaced, the excellent toughness and tensile strength of the reinforcing layer are utilized to disperse the stress generated when the yoga mat is bent, avoiding cracking and breakage of the PU foam layer due to stress concentration, thus solving the problems mentioned in the background art.

This invention discloses a controlled-release solid film formulation for pesticides, its preparation method, and its applications. This invention upgrades pesticides from liquid / powder formulations to solid film formulations, utilizing the solid film to physically block pesticide drift, diffusion, and loss, reducing off-target effects at the source. Through the combined use of physical and chemical techniques, pesticides are uniformly distributed within the solid film, and the pesticide release cycle is synchronized with the solid film degradation, achieving precise controlled release. This solid film formulation is applied from the beginning of crop growth, synchronized with the plant growth cycle, providing early preventative effects through quantitative controlled release of pesticides. This solid film formulation also functions as a mulch film; its preparation process is simple and easy, it is completely degradable and requires no recycling, reducing costs. The identification method of this invention utilizes selective precipitation separation technology, achieving high pesticide extraction efficiency of 95%-98%, especially suitable for low water-soluble pesticides. The drug identification process is simple to operate: the entire process takes less than 4 hours, requires no complex purification steps, and is suitable for batch sample processing.

The present application relates to the chemical technology field, specifically to a kind of β-naphthalenesulfonic acid sodium formaldehyde condensate and preparation method thereof, the preparation method is prepared naphthalenesulfonic acid mixture with naphthalene and sulfuric acid as raw material, β-naphthalenesulfonic acid in naphthalenesulfonic acid mixture is extracted by melt crystallization, β-naphthalenesulfonic acid is sequentially subjected to condensation reaction, neutralization reaction and purification step, and β-naphthalenesulfonic acid sodium formaldehyde condensate is obtained.The present application extracts β-naphthalenesulfonic acid from naphthalenesulfonic acid mixture by melt crystallization method, which has high purity and high yield, and avoids removing α-naphthalenesulfonic acid by hydrolysis reaction and recycling the generated naphthalene, without using lime for impurity removal, thereby avoiding the introduction of calcium and magnesium ions and other impurities.The operation steps of the present application for preparing β-naphthalenesulfonic acid sodium formaldehyde condensate are simpler than traditional methods, and the product quality and economy of β-naphthalenesulfonic acid sodium formaldehyde condensate are improved.

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 integrated method and system for the co-production of MTO methanol and refined methanol, belonging to the field of chemical technology. The co-production method provided by this application includes: feeding crude methanol into a light-duty removal distillation column for pre-distillation treatment to obtain a pre-distillation column bottom component; dividing the pre-distillation column bottom component into two streams, one as the output of MTO methanol and the other as a reprocessed component of the pre-distillation column bottom; feeding the reprocessed component of the pre-distillation column bottom into a refined methanol distillation column for distillation treatment to obtain a distillation column top component and a distillation column bottom component; at least a portion of the distillation column top component is output as refined methanol, and the distillation column bottom component is returned to the light-duty removal distillation column. This application achieves the co-production of refined methanol using only two columns, eliminating the need for additional independent equipment, significantly reducing equipment investment costs, and enabling flexible adjustment of both MTO methanol and refined methanol products, thus possessing broad application prospects in the industrial-grade MTO methanol field.

The invention discloses a high-strength polytetrafluoroethylene dispersion resin and a preparation method thereof, and belongs to the technical field of chemical engineering, and the preparation method comprises the following steps: preparing a linen fiber / nano silicon dioxide microsphere filler, adding the linen fiber / nano silicon dioxide microsphere filler into a polytetrafluoroethylene dispersion stock solution to form slurry, adding a modifier into the slurry to form composite slurry, putting the composite slurry into an ultraviolet ozone reaction cabin to carry out ultraviolet / ozone synergistic modification treatment, obtaining modified composite slurry after the treatment is completed, and carrying out molding treatment on the modified composite slurry to obtain the high-strength polytetrafluoroethylene dispersion resin. Through the mode, the linen fiber / nano silicon dioxide microsphere filler and ultraviolet ozone modification treatment synergistically enhance the strength of the dispersion resin.

This invention belongs to the field of wet electronic chemicals technology, specifically relating to a method for preparing electronic-grade hydrogen peroxide. The method includes the following steps: adjusting the concentration of raw hydrogen peroxide, and then filtering it sequentially through a reverse osmosis membrane, a modified cation exchange resin, an anion exchange resin, and a mixed ion exchange resin to obtain electronic-grade hydrogen peroxide. The modified cation exchange resin used is modified based on conventional cation exchange resin through pore expansion and grafting, optimizing the spatial matching of pore structure and functional sites. This achieves passivation of metal ions, enhanced adsorption capacity, and improved oxidation resistance, as well as a deep synergistic effect of these three effects. Ultimately, it achieves the dual goals of efficient purification and stable operation of the resin in the hydrogen peroxide system. The resulting electronic-grade hydrogen peroxide can reduce the content of single impurity metal ions to below 5 ppt, meeting the requirements of SEMI G5 standards, and can be directly applied to high-end manufacturing fields such as semiconductor wafer cleaning.

The utility model belongs to the technical field of chemical engineering, and particularly relates to a moisture-proof device for storing superfine aluminum hydroxide powder, which adopts the following scheme that the moisture-proof device comprises a container, and an air inlet and a mounting groove are formed in the front side of the container; the door is rotationally connected to the right side of the container; the exhaust fan is fixedly mounted on the right side of the container; the dehumidifier is fixedly installed on the inner wall of the front side of the container, and an air inlet pipe of the dehumidifier is fixedly connected with the inner wall of the rear side of the air inlet hole; the filter screen is movably connected with the inner wall of the air inlet hole; according to the container, the filter screen can be easily disassembled and assembled, blockages on the filter screen can be conveniently cleaned, the blockages are prevented from influencing air circulation, the exhaust fan, the filter screen and the dehumidifier are installed on the container, air in the container can be kept dry, ventilation is good, and the container is convenient to clean. And the problem that the superfine aluminum hydroxide powder is affected with damp, so that the superfine aluminum hydroxide powder is caked and the use is influenced is solved.

This invention discloses a process for preparing solid sodium silicate based on controllable particle size water quenching, belonging to the field of inorganic silicate chemical technology. The specific steps are as follows: S1: raw material melting and homogenization; S2: controllable particle size water quenching; S3: solid-liquid separation and online classification; S4: deep drying and packaging. This invention achieves innovation and simplification of the production process: through a one-step "atomization-cooling" forming method, the high-energy-consuming crushing and screening processes in traditional processes are completely eliminated, shortening the process flow and reducing equipment investment and maintenance costs; it significantly improves the overall quality of the product: directly generating solid particles with high sphericity and smooth surface, the product has good flowability, stable bulk density, high whiteness, and no tendency to agglomerate during subsequent dissolution, with a faster dissolution rate and superior application performance.

The application belongs to the field of carbon capture and utilization and green chemical technology, and particularly relates to a method for catalytically synthesizing glycerol carbonate by using a hydrophobic porous ionic liquid / water composite system. The application first synthesizes a hydrophobic ionic liquid by directionally regulating the structures and functional groups of anions and cations of the ionic liquid, and constructs a hydrophobic porous liquid by highly dispersing a surface-functionalized metal organic framework in the hydrophobic ionic liquid, and then introduces deionized water in different amounts and compositions to form a hydrophobic porous ionic liquid / water composite system. Then, CO2 and glycerol are used as reaction substrates, and the hydrophobic property of the porous ionic liquid phase is used to remove water into the water phase in real time during the reaction process, so as to effectively promote the forward movement of the reaction equilibrium, and realize the directional enrichment of the product glycerol carbonate. The method has mild reaction conditions and simple operation, the ionic liquid and the catalyst can be recycled by simple static layering, and has the dual benefits of carbon emission reduction and resource high-value utilization.

The utility model provides a one-time passing type vacuum wax filter, which relates to the technical field of chemical engineering and comprises a control system, a driving device and a filtering device, the filtering device comprises a filter and a vacuum separator which are sequentially arranged between a wax inlet and a wax outlet, and the control system comprises a plurality of control assemblies and a plurality of detection assemblies. By arranging the control assembly and the detection assembly, the amount of the residual wax liquid in the filtering equipment is detected, and the driving equipment is controlled to be started or stopped, so that the wax liquid is automatically and continuously treated, the time cost is reduced, the efficiency is improved, the operation and the maintenance are convenient, and personnel watching is not needed; the whole wax liquid recycling and filtering link is automatically and continuously operated and does not need to be manually watched and operated, the filtered and recycled wax liquid is clean, the water content is accurate, the loss of the wax liquid is reduced, the quality of the wax liquid is improved, and the service life and period of the wax liquid are prolonged.

The utility model discloses a kind of high-efficiency cooling fermentation tanks, relate to chemical technology field.Cooling water is better contacted with the whole outer wall of tank body by spiral channel, with the flow of cooling water along spiral channel, its coldness gradually loses, by the pitch variation of spiral channel, the flowability of cooling water gradually strengthens, the cooling effect of lower part of tank body is strengthened, so as to make up the coldness loss of cooling water, so that the cooling effect of upper and lower part of tank body is more balanced.The setting of constant pressure pipe prevents unnecessary pressure mutation when adjusting water pressure of water inlet end, and the suddenly increased water pressure of water inlet end is discharged to water outlet end, so as to balance the pressure of water inlet and outlet, further strengthen the stability of cooling work, and ensure the cooling efficiency.

The application discloses a kind of based on machine learning prediction amide bond molecular synthesis conversion rate method, belong to chemical technical field.The application is based on high-throughput experiment collection reaction conversion rate data, establishes data set, and utilizes quantum chemistry calculation means to extract the feature descriptor of reaction related molecule, and the model after training finds that random forest model only needs a small amount of data to reach good prediction accuracy.Through the prediction of unknown aromatic amine molecular conversion rate in amidation reaction, it is found that a small amount of relevant reaction data can be added in the training set of random forest model to significantly improve the prediction performance of unfamiliar data.This has important guiding significance for exploring the synthesis of amide bond and the future application of machine learning to the field of chemical synthesis.

The utility model relates to the technical field of petrochemical engineering, in particular to a p-diethylbenzene recovery system which comprises a p-diethylbenzene collecting tank, an air cooler, a p-diethylbenzene tank area, a steam heat exchanger, a carclazyte tower and a circulating pipeline, an outlet header pipe of the p-diethylbenzene collecting tank is connected to a p-diethylbenzene tank area through a first branch pipeline, the air cooler is arranged on the first branch pipeline, and the p-diethylbenzene tank area is sequentially connected with a steam heat exchanger and a carclazyte tower through a tank area outlet pipeline. An outlet of the carclazyte tower is connected to a p-diethylbenzene system through a p-diethylbenzene external supplement pipeline, an outlet sampler is arranged on the p-diethylbenzene external supplement pipeline, and the p-diethylbenzene external supplement pipeline is connected to an inlet of a p-diethylbenzene collecting tank through a circulating pipeline. According to the utility model, the outlet sampler is arranged at the outlet of the carclazyte tower, the treated diethylbenzene is sampled and detected, the diethylbenzene is circularly treated through the circulating pipeline, and after the diethylbenzene is monitored to be qualified, the diethylbenzene is merged into the system, so that the system is prevented from being polluted.

The invention belongs to the technical field of pharmaceutical chemicals, and particularly relates to a method for preparing guanidinoacetic acid from glycine mother liquor. Based on a glycine-cyanamide method, a glycine solution containing iminodiacetic acid is used as one of reaction raw materials. When the method is used for preparing the guanidinoacetic acid, the glycine mother liquor can be directly used for preparing the guanidinoacetic acid, so that the mother liquor is directly treated, the separation step of the glycine mother liquor is omitted, and the process is simplified. Moreover, the method has an unexpected technical effect on the improvement of the yield of the guanidinoacetic acid, and the yield of the guanidinoacetic acid is improved by 6.2-6.4% compared with the prior art.

The invention belongs to the technical field of wet electronic chemicals, and particularly relates to a buffer oxide etching solution (BOE) with high selection ratio of silicon dioxide (SiO2) to silicon oxynitride (SiOxNy) in semiconductor manufacturing, and the etching solution comprises the following components in percentage by mass: 0-20% of HF, 20-40% of NH4F, 0.01-0.05% of an impregnating compound, 0.005-0.01% of an additive and the balance of ultrapure water. The wetting agent is introduced, so that the wettability of the silicon dioxide film layer can be improved, and the etching roughness is improved; meanwhile, after 2-(2-(2-hydroxyethoxy)-ethoxy)-ethyl phosphonic acid is added, a phosphonic acid group can form coordination with a Si-N bond in silicon oxynitride, and the silicon oxynitride film etching selection ratio of silicon dioxide can be remarkably increased under the condition that the silicon dioxide etching rate is not reduced. The etching liquid is stable, the solution is clear and transparent, and the addition of the additive can reduce the surface tension and improve the infiltration and undercutting capabilities of the etching liquid.

The invention discloses a method for comprehensively recycling yellow phosphorus slag of an electric furnace, and belongs to the technical field of chemical engineering. Comprising the following steps: grinding slag, adding nitric acid in proportion, reacting dicalcium silicate in the slag with nitric acid to generate calcium nitrate and silicon slag, and reacting calcium nitrate with ammonium carbonate to prepare an ammonium nitrate product and a calcium carbonate product; and washing and separating the silicon slag to obtain orthosilicic acid, returning one part of orthosilicic acid to be re-blended with the phosphate ore to enter the furnace so as to recycle the slag, and calcining the rest part of orthosilicic acid to obtain a white carbon black product. The use amount of silica is reduced, mineral resources of silica are saved, and the use amount of silica produced from yellow phosphorus reaches self-balance.

This application relates to the field of electrochemical technology, and provides a sulfide solid electrolyte and an all-solid-state lithium battery. The chemical formula of the sulfide solid electrolyte is Li. 7‑2x‑y PM x S 6‑x‑y O x Cl 0.7y Br 0.3y M is at least one of Ca, Mg, and Cu, with 0.01≤x≤0.3, 0.5≤y≤2, and 0.008≤x / y≤0.24. The molar ratio of M to O is 1:1, and the molar ratio of Cl to Br is 7:3. The grain boundary resistance of the sulfide solid electrolyte at 25°C is 20Ω to 100Ω. Through the above settings, the sulfide solid electrolyte of this application achieves both high ionic conductivity and good air stability while also exhibiting low grain boundary resistance. Furthermore, the application of the sulfide solid electrolyte of this application in all-solid-state lithium batteries can improve the electrochemical performance of all-solid-state lithium batteries.

This invention relates to the field of titanium chemical technology and discloses a refining process for crude titanium tetrachloride, comprising: feeding crude titanium tetrachloride and a vanadium removal agent into the bottom of a distillation column, mixing them in the bottom, and completing the vanadium removal reaction; the material in the bottom is extracted by a refining circulation pump and heated, then returned to the upper middle part of the bottom for in-situ flash evaporation, and the flash-evaporated liquid phase falls back to the bottom of the bottom; the titanium tetrachloride vapor generated by flash evaporation enters the purification section at the top of the distillation column for distillation separation, and the refined titanium tetrachloride gas generated at the top is condensed and enters a reflux tank, part of which is returned to the top of the distillation column to control the distillation purity, and the other part is output as qualified refined titanium tetrachloride product. This invention also provides a system for implementing this process. This invention solves the technical problem that traditional processes require multiple separate devices such as a circulation pump tank and a flash evaporation tank, making production operation and condition control difficult.

The invention relates to the technical field of chemistry, in particular to a method for preparing magnesium hydroxide from a magnesium salt solution through a gaseous ammonia precipitation method, and the method is particularly suitable for extracting magnesium hydroxide from multi-component water mineral raw materials with high calcium content. The method comprises the following steps: in a nitrogen or inert gas atmosphere, introducing gaseous ammonia into a magnesium salt solution (comprising a multi-component water mineral raw material containing high-concentration calcium), and controlling the molar ratio of NH to Mg to be 2.5: 1-4: 1, so that magnesium hydroxide is precipitated and separated out; and after the precipitation process is completed, filtering and washing under the same atmosphere, and drying and crushing the obtained product. The method can realize one-step high-efficiency separation of magnesium hydroxide, and is also suitable for taking a multi-component natural mineral raw material with high calcium content as an initial solution.

The application relates to the chemical technology field and discloses a metallocene compound, a preparation method and a metallocene catalyst and application thereof. The metallocene compound provided by the application comprises a fluorenyl ligand, a metallocene ligand, a bridging structure and a metal part in a chemical structure. By introducing an adsorption group with a micropore effect into the fluorenyl ligand, the metallocene compound can exhibit strong saturated adsorption capacity when interacting with cocatalysts such as organic boron and organic aluminum, the cocatalyst concentration around the metal center can be improved, the activity and thermal stability of the catalyst can be significantly enhanced, the metallocene compound can catalyze alpha-olefin polymerization with high activity, the amount of the cocatalyst is reduced, and the production cost of polyolefin is reduced.