946 results about "Chlorine gas" patented technology

The invention belongs to the crossing field of artificial intelligence and process control, particularly relates to an intelligent coupling control strategy for chlorine production through seawater electrolysis based on digital twinning, and aims to solve the problems of response lag, weak disturbance suppression and lack of electrode aging early warning in a traditional control method. According to the strategy, a high-fidelity digital twin fusing electrochemistry, fluid and thermodynamics is constructed, characteristics of current, temperature, impedance spectroscopy and the like are collected and fused at high frequency through a multi-source sensor, a state space model driven by a deep recurrent neural network is established, and current efficiency and electrode aging coupling evolution recognition is achieved; when salinization or flow mutation is detected, the twinborn body predicts and dynamically calibrates the current density and the voltage set value in advance, and the safety process window is synchronously scaled. According to the strategy, the chlorine gas yield fluctuation is reduced by 60%, the energy consumption standard deviation is reduced by 45%, the fault early warning is advanced by 2-5 hours, the fault-free operation time of the system is prolonged by 50%, and high-precision, self-adaptive and preventive intelligent control of the electrolysis process is realized.

The invention discloses a diamond film and a preparation method and application thereof, and the preparation method comprises the steps: taking a substrate material matched with the lattice constant of a diamond film material as a substrate, and carrying out the surface treatment of the substrate; mixed reaction gas comprising 80%-95% of hydrogen, 3%-8% of methane and 2%-12% of auxiliary gas is introduced, wherein the auxiliary gas comprises at least one of argon, chlorine, hydrogen fluoride and hydrogen chloride; carrying out controlled chemical vapor deposition at 850-1000 DEG C under the pressure of not less than 21 kPa, and growing a diamond film on the surface of the substrate; and annealing the diamond film. According to the method, chemical vapor deposition is controlled through cooperation of auxiliary gas and temperature-pressure gradient, and non-corrosion high-speed growth of the high-purity monocrystal diamond film is achieved; in combination with a dynamic annealing process, lattice defects are effectively repaired, the comprehensive performance is optimized, and the reliability of the thin film serving as a heat dissipation component and other applications is remarkably improved.

The invention discloses a preparation method of low-carbon-content high-purity quartz sand, which comprises the following steps: carrying out alkaline hydrolysis and drying on organosilane to obtain alkaline xerogel, putting the alkaline xerogel into a quartz tube of a rotary tube furnace, starting the furnace body, adjusting the rotation rate, heating to a specific low temperature, and introducing nitrogen to replace air; introducing oxygen, controlling the pressure, carrying out oxidation reaction, relieving the pressure to normal pressure after the reaction, pumping and discharging the product, and repeating the oxidation and pumping steps for many times until the tail gas carbon dioxide reaches the standard; raising the temperature, introducing chlorine-containing gas for purification, finally raising the temperature to a sintering temperature, and sintering in an air atmosphere to obtain the low-carbon-content high-purity quartz sand. According to the preparation method, the energy consumption and the equipment cost of the carbon removal procedure are greatly reduced, the specific surface area and the densification performance of the subsequent high-purity quartz sand product can be guaranteed, and a technical path which is low in energy consumption, high in efficiency and capable of giving consideration to the product performance is provided for industrial preparation of the high-purity quartz sand through a sol-gel method.

The invention relates to the technical field of chemical gas, in particular to a chlorine leakage detection method and system in reaction kettle production. The method comprises the following steps: acquiring chlorine concentration values and wind field vectors of a plurality of positions around a reaction kettle at each moment; marking any moment as a target moment, and determining the gas diffusion contribution coefficient of each position to other positions at the target moment; determining a real gas diffusion contribution coefficient of each position to other positions at the target moment; determining the airflow correction density of each position at the target moment; and positioning a chlorine leakage source by using a density peak clustering algorithm based on the airflow correction densities of all positions at the target moment. According to the method, the wind field vector is introduced to construct the gas diffusion contribution coefficient to correct the density, the limitation of traditional static diffusion is overcome, the real leakage source and the concentration convergence point in the downwind direction are effectively distinguished, the accuracy and reliability of chlorine leakage source positioning are improved, and support is provided for safe emergency disposal.

The invention discloses a continuous reaction device and method for producing 2-amino-4-methylbenzothiazole, and belongs to the technical field of compound production. The invention relates to a continuous reaction device for producing 2-amino-4-methylbenzothiazole, which comprises a first-stage reaction kettle and further comprises a stirring mechanism arranged in the first-stage reaction kettle and used for stirring chlorine and a mixed solution in the first-stage reaction kettle; the driving mechanism is arranged at the top of the first-stage reaction kettle and is used for driving the stirring mechanism to perform stirring action in the first-stage reaction kettle; the chlorine injection mechanism is connected with the stirring mechanism; the air exhaust mechanism is arranged at the top of the first-stage reaction kettle and is connected with the driving mechanism; the multistage reaction kettles are adopted for continuous operation to eliminate downtime, so that the problem of low production efficiency caused by repeated heating and cooling due to the use of intermittent reaction kettles in the traditional process is solved, the chlorine utilization rate is improved, and the production and processing cost is effectively reduced.

The invention provides a method for recycling valuable metal from germanium-antimony-tellurium alloy waste. The method comprises the three steps of surface treatment, chlorine reaction and compartment condensation and discharging. Oxidation films on the surfaces of the waste materials are removed through surface treatment, and the subsequent chlorine reaction efficiency is improved; then a self-made chlorination-step condensation integrated device is utilized, germanium, antimony and tellurium react with chlorine at the high temperature to generate gaseous chloride, step-by-step condensation separation is achieved through partition temperature control based on the boiling point difference of tellurium tetrachloride, antimony pentachloride and germanium tetrachloride, and target products are collected respectively; and finally, introducing inert gas to purge residual chlorine, and discharging safely. The method has the advantages of short process flow, no need of complex wet process steps and low equipment investment; metal chlorides are efficiently separated through the integrated device, and recovery is thorough; and the pyrogenic process is mainly adopted, no wastewater is generated, only tail gas is treated in a compliance manner, and the method is environment-friendly. Compared with a traditional wet process, the method has the remarkable advantages of high efficiency, low cost, environment friendliness and the like.

The invention discloses an electronic waste efficient chlorination comprehensive recovery device and method, and relates to the technical field of chemical metallurgy, the electronic waste efficient chlorination comprehensive recovery device comprises a chlorination reaction cavity, a heating system, a vacuum system, an atmosphere control system and a condensation separation system; the heating system is used for controlling the temperature of the chlorination reaction cavity; the vacuum system is communicated with the heating system; the atmosphere control system comprises a chlorine gas source and a protective gas source; and the temperature of the condensation separation system is gradually reduced. Through the high-purity graphite heating assembly, the sealing structure and the atmosphere control system, the highest heating temperature is 1700 DEG C, the temperature limit of 1200 DEG C of a traditional quartz tube furnace can be broken through, the chlorine corrosion problem is solved, chlorine is not leaked, and the environment is not polluted. High-valued recovery of different metal resources can be achieved through low-temperature pyrolysis, high-temperature chlorination volatilization and three-stage condensation settling separation, and the method has the advantages of being low in energy consumption, high in recovery rate, environmentally friendly and the like and is suitable for industrial metal resource recovery.

The invention belongs to the technical field of preparation of organic chemicals, and particularly relates to trifluoropyruvic acid and a method for preparing trifluoropyruvic acid from trifluoroacetone. The method comprises the following steps: dissolving trifluoroacetone in a chlorinated solvent, adding a catalyst, introducing chlorine, carrying out a closed reaction, controlling the reaction temperature, cooling to room temperature after the reaction is finished to obtain a 1, 1, 1-trichlorotrifluoroacetone reaction mixture, adding an alkali liquor to carry out a hydrolysis reaction, separating out a water phase after the reaction is finished, and drying to obtain the trifluoropyruvic acid. And continuously applying the chlorination solvent, continuously adding the acid into the water phase to adjust the pH value to 3-4 to obtain a trifluoropyruvic acid water solution, finally extracting and pulping to obtain a wet trifluoropyruvic acid product, and purging with air to obtain a pure trifluoropyruvic acid product. According to the method for preparing trifluoropyruvic acid from trifluoroacetone, the raw materials are easy to obtain, the process is stable, the yield is high, the cost is low, and the invention further provides a trifluoropyruvic acid product.

The present application belongs to the technical field of rare metal metallurgy, and particularly relates to a method and device for removing arsenic in germanium tetrachloride by hydrogen peroxide oxidation. The arsenic removal device comprises GeCl4, H2O2 and HCl storage containers, the storage containers are connected with a first reactor and a second reactor through pipelines, fourth, fifth, sixth, seventh and eighth valves are arranged on the pipelines, a first constant temperature heater is arranged at the lower part of the first reactor, a first mechanical stirrer is arranged at the top of the first reactor, a first residual liquid collector is connected with the bottom of the first reactor through a pipeline, and ninth and eleventh valves are arranged between the first reactor and the first residual liquid collector. Compared with the traditional chlorine arsenic removal method, the present application uses hydrogen peroxide to remove arsenic in germanium tetrachloride, is more environmentally friendly, safe, low-cost and does not bring new impurity elements, and the arsenic removal effect is very significant.

The utility model relates to the technical field of exhaust and ventilation equipment, and discloses exhaust and ventilation equipment which is of a double-channel structure, a first exhaust pipe and a second exhaust pipe are arranged on the rear portion of an air suction guide pipe, and the first exhaust pipe and the second exhaust pipe are selectively communicated through a communication mechanism. The communicating cylinder base is driven by the driving motor to be rotationally installed in the sealing cylinder base, the air suction guide pipe can be independently communicated with the first exhaust pipe and the second exhaust pipe through rotation for channel switching, the structure is simple, work is reliable, discharged chlorine can be classified through channel switching according to the chlorine concentration change, and the chlorine treatment efficiency is improved. Unnecessary resource consumption is avoided, the chlorine treatment cost can be reduced while the working flexibility of the device is improved, the electric butterfly valve is arranged in the middle of the air suction guide pipe, the electric butterfly valve and the communicating mechanism are synchronously in a closed state after chlorine is exhausted, and the sealing protection performance in the working chamber can be effectively improved through double sealing.

The invention provides a preparation method of chlorinated paraffin 70 with a high softening point, and belongs to the technical field of chlorinated paraffins.The preparation method comprises the steps that S1, mixed wax is provided, and raw materials of the mixed wax are Fischer-Tropsch wax and petrochemical wax; s2, feeding the mixed wax into a reactor, then turning on an ultraviolet lamp in the reactor for irradiation, after liquid chlorine is gasified to form chlorine, feeding chlorine into the reactor, heating and carrying out segmented control reaction; s3, after the reaction is finished, blowing air into the reactor, then washing a reaction product with water, and then adding a compound stabilizer into a crude product obtained by washing with water, so as to obtain chlorinated paraffin 70; the chlorine content of the chlorinated paraffin 70 is not less than 69.5%, the softening point is not less than 98 DEG C, and the acid value is not more than 0.1 mgKOH / g. According to the method, hot chlorination and photo-initiation are combined, so that the chlorine content and the softening point of the product are controllable, the production efficiency is high, the reaction speed is high, the reaction temperature is reduced, the production period is shortened, and the product quality is stable.

The invention relates to the technical field of disinfectant generation, in particular to a hypochlorous acid disinfectant generation device based on a jet flow type phase interface reaction method, which comprises a bracket, and further comprises a mixing and pressurizing assembly, a mixing pipe mounted on the bracket, a discharging pipe arranged at one end of the mixing pipe, and a pressurizing pipe arranged at the other end of the mixing pipe, a second liquid adding pipe and a liquid outlet pipe are respectively arranged at the end part of the pressurizing pipe; the adjusting assembly comprises a detection pipe installed above the pressurizing pipe, gas in the liquid outlet pipe is detected through the detection pipe, an adjusting piece is arranged between the detection pipe and the second liquid adding pipe, and the flow speed of liquid in the second liquid adding pipe is adjusted through the adjusting piece according to the gas detected by the detection pipe. The adjusting assembly is arranged at the end of the pressurizing pipe, whether chlorine is generated in the liquid outlet pipe of the pressurizing pipe or not is monitored in real time, when chlorine appears, the liquid inlet amount of raw materials is adjusted in time, meanwhile, the position is cooled, meanwhile, the adjusting and detecting means both adopt power during liquid inlet of the raw materials, and more production cost is saved.

A production process of electronic grade molybdenum dichloride dioxide comprises the following steps: S1, pretreatment: contacting molybdenum trioxide with a dilute acid solution at a low temperature for pickling to remove alkaline impurities and soluble metal impurities adsorbed on the surface, and drying for later use after washing; s2, wet synthesis: in an inert gas atmosphere, reacting the molybdenum trioxide subjected to acid pickling in the step S1 with concentrated hydrochloric acid of which the mass is 4-5 times of that of the molybdenum trioxide at 80-100 DEG C, and after the reaction is finished, evaporating and concentrating in a high-temperature chlorine atmosphere to generate a crude product of dichloromolybdenum dioxide; s3, primary sublimation purification; s4, complexing and decomplexing purification; and S5, secondary sublimation purification: using a quartz sublimation tower to carry out vacuum sublimation on the secondary decomplexed molybdenum dichloride obtained in the step S34, and collecting sublimation condensate to obtain the electronic grade molybdenum dichloride. The final product purity of the production process is greater than or equal to 6N, and the process can be used for large-scale production.

The invention relates to the technical field of decontamination vehicles, and provides a chemical decontamination vehicle for chlorine leakage rescue disposal, the chemical decontamination vehicle comprises a frame and a carriage mounted at the top of the frame, a decontamination chamber is arranged on the front side in the carriage, a cleaning assembly for independently cleaning decontamination personnel is arranged in the decontamination chamber, a recovery cavity is arranged at the tail end of the carriage, and a control module is arranged in the recovery cavity. A high-pressure spraying assembly is arranged in the recycling cavity, lifting driving pieces used for driving the high-pressure spraying assembly to be lifted to the outer top of the compartment are arranged on the left cavity wall and the right cavity wall in the recycling cavity, and a water curtain forming mechanism matched with the high-pressure spraying assembly is arranged on the top of the compartment. Through organic combination of the water curtain barrier and the high-pressure jet decontamination, the comprehensive control capability on leakage areas of harmful gases such as chlorine is enhanced, the operation experience and the safety guarantee of decontamination personnel are optimized, the scientificity and the practicability of rescue treatment are greatly improved, and the method is suitable for popularization and application. And a more efficient and reliable technical means is provided for chemical leakage emergency response, and the method has remarkable popularization and application values.

The invention relates to the field of hydrazine hydrate, in particular to an efficient and green hydrazine hydrate synthesis method. The efficient and green hydrazine hydrate synthesis method comprises the following steps: mixing chlorine, sodium hydroxide and water, and reacting to obtain a sodium hypochlorite solution; the method comprises the following steps: mixing a sodium hypochlorite solution, urea and a catalyst, and reacting to obtain hydrazine hydrate, tail gas and a byproduct; and tail gas and by-products are recovered. Through mechanism-driven process design, high efficiency, greenization and economy of hydrazine hydrate synthesis are realized, and a sustainable solution is provided for industrial application.

The invention relates to a method and a system for preparing chloroethylene carbonate through continuous photochlorination. The system aims at solving the three technical problems that the mass transfer efficiency of chlorine is low under the high gas-liquid ratio, reaction balance is inhibited by accumulation of hydrogen chloride by-products, and selectivity is reduced due to excessive chlorination. The method provided by the invention comprises the following steps: dispersing chlorine into bubbles of 50 microns or below by adopting a metal sintering microbubble generator; a light source and a hollow fiber membrane separation assembly are arranged in the reactor, chlorine and ethylene carbonate are subjected to a reaction through photo-initiation to generate chloroethylene carbonate, and meanwhile generated hydrogen chloride is removed through membrane in-situ displacement by means of purging gas; the system adopts a two-section series structure, and the reaction depth is cooperatively controlled through sectional chlorine gas introduction and gradient illumination intensity. The method provided by the invention realizes efficient utilization of chlorine, real-time breaking of reaction balance and high-selectivity synthesis of monochlorinated products, and is suitable for continuous, safe and efficient industrial production of chloroethylene carbonate.

The invention provides a method for controlling an oxidation reaction of an ADC (azodicarbonamide) foaming agent by intermittently introducing chlorine, which comprises the following steps: dissolving biurea and water in a reaction kettle according to a solid-to-liquid ratio of 1: (2-3) to obtain biurea slurry; adding halide into the biurea slurry as an oxidation aid, and introducing chlorine into the reaction kettle for reaction under the condition that the temperature in the reaction kettle is adjusted to 10-40 DEG C; when the reaction is carried out to 85%-90%, chlorine introduction is stopped, polyoxyethylene stearate is added into the reaction kettle to serve as a surfactant, and the mass ratio of reactants in the reaction kettle to polyoxyethylene stearate is 100: (0.01-0.1); continuously introducing chlorine into the reaction kettle, and controlling the chlorine to be intermittently introduced into the reaction kettle until the reaction is finished; the chlorine introduction time is 1-30 min / time, and the intermittent time is 1-40 min / time; filtering and cleaning reactants in the reaction kettle step by step, and drying, crushing, grading and the like after the pH value of the reactants reaches 6.5 to obtain a finished product ADC foaming agent. The end point of the ADC oxidation reaction can be effectively controlled, and excessive chlorine is prevented from decomposing the product.

The invention discloses a method for synergistically extracting vanadium oxytrichloride, gallium trichloride and iron-titanium alloy from vanadium slag, and belongs to the field of recycling of complex multi-metal resources. The method comprises the following steps: uniformly mixing the gallium-containing vanadium slag, carbon and chlorinated waste salt according to a certain proportion, and carrying out vacuum melting treatment to obtain a Fe-Ti alloy; then chlorine is introduced for chlorination treatment, and a gaseous product is obtained; the gaseous product is adsorbed by a molecular sieve with a function of selectively adsorbing VOCl3 to obtain VOCl3, and then GaCl3 is obtained through a cold trap. According to the method, efficient collaborative conversion and recovery of multi-metal resources of vanadium, gallium, iron and titanium in the vanadium slag are achieved, and the problems that multi-metal collaborative extraction in existing vanadium slag is difficult, and the separation efficiency is low can be effectively solved.

The invention belongs to the technical field of sodium hypochlorite production, and particularly relates to a method for producing sodium hypochlorite. A method for producing sodium hypochlorite comprises the following steps: adding a compound additive into a sodium hydroxide aqueous solution, and uniformly stirring to obtain a compound alkali-containing raw material solution; respectively introducing the composite alkali-containing raw material solution and chlorine into the micro-channel reactor through a metering pump, and controlling reaction conditions to generate a reaction solution containing sodium hypochlorite; introducing the reaction liquid into a ceramic membrane separation device, separating and removing unreacted solid impurities and by-product salts, and collecting permeate; unreacted sodium hydroxide is recycled and reused; and detecting the permeate liquid to be qualified to obtain a sodium hypochlorite finished product. According to the invention, four key links of compound additive addition, microchannel reaction, ceramic membrane separation and resin recovery are organically linked to form a systematic solution. Aiming at the core pain points of insufficient reaction, more byproducts, raw material waste, equipment corrosion and the like in the traditional process, the product purity is improved through the synergistic effect of all links.

The invention discloses a device and a method for recovering organic matters in hydrogen chloride gas, and relates to the technical field of chemical environmental protection, the device comprises a falling film absorber and an acid storage tank, the falling film absorber adopts a vertical multi-tube-pass structure, and a tube pass is provided with a film distributor; an organic matter overflow pipe is arranged on the tank wall of the acid storage tank, the acid storage tank is communicated with the falling film absorber through a pipeline system, and a closed cooling jacket is arranged outside the tube pass of the falling film absorber; the film distributor comprises a top cover, a sealing disc and a film distribution cone, and the top cover is fixed to the top of the tube pass to form a closed cavity. The invention aims to solve the problems of hydrochloric acid product pollution, excessive tail gas VOCs (Volatile Organic Compounds), resource waste, environmental violation and the like caused by residual chlorobenzene in byproduct hydrogen chloride in the reaction of benzene and chlorine in the prior art. The device and the method have the advantages that efficient hydrogen chloride absorption and organic matter resource recovery are synchronously realized through the synergistic effect of gas-liquid mass transfer reinforcement, low-temperature stable control and continuous gravity phase splitting.

The invention belongs to the technical field of brominated flame retardant synthesis, and particularly provides a decabromodiphenyl ethane bromine distillation process chlorination bromine removal process, which comprises the following steps: S1, adding bromine into a reaction kettle, adding a catalyst, and mixing; cooling and dropwise adding molten diphenylethane; then heating, carrying out a heat preservation reaction, and cooling to obtain a brominated crude product; s2, S201, adding the brominated crude product obtained in S1 into a bromine steaming kettle, and heating; s202, chlorine is introduced, and the total amount of bromine and chlorine is detected; carrying out segmented control on the introduced chlorine according to the total amount of bromine and chlorine; s203, when the total amount of bromine and chlorine is reduced to a threshold value, stopping introducing chlorine, standing, cooling, and introducing nitrogen; s3, filtering the feed liquid in the bromine steaming kettle, washing and purifying for three times, and finally, centrifugally dewatering to obtain a faint yellow solid; and S4, adding the faint yellow solid into a high-temperature jet mill, performing high-temperature aging to obtain white powder, and then performing jet milling on the white powder to obtain a finished product. Physical distillation is replaced by chemical replacement, so that bromine is highly separated.

The invention discloses an o-chlorotoluene continuous chlorination reaction device and method, and relates to the technical field of chemical engineering, the o-chlorotoluene continuous chlorination reaction device comprises a reaction kettle, the top of the reaction kettle is fixedly provided with a power assembly, the o-chlorotoluene continuous chlorination reaction device further comprises a mixing assembly, the mixing assembly is arranged in the reaction kettle, and the mixing assembly comprises a fixed partition plate fixedly connected to the middle section in the reaction kettle; a methylbenzene input pipe and a chlorine input pipe are fixedly inserted into the top end of the reaction kettle, a rotating rod is fixedly connected to the power output end of the power assembly, a rotating sleeve is rotatably inserted into the top end of the reaction kettle, and a movable partition plate is fixedly connected to the bottom end of the rotating sleeve; a plurality of lowering holes are formed in the surfaces of the movable partition plate and the fixed partition plate, the rotating rod is inserted into the rotating sleeve, and the top end of the rotating sleeve is fixedly sleeved with an outer gear ring, so that the problems that in the period of time when prepared finished products are discharged, the production is stopped, the production interval is large, and the production efficiency is high are solved. And continuous chlorination reaction cannot be carried out.

The invention belongs to the technical field of comprehensive utilization of seawater resources, and particularly relates to a green circulation method and system integrating seawater desalination and high-efficiency bromine extraction of concentrated seawater, and the system comprises a seawater desalination unit, a pretreatment unit, an oxidation replacement unit, a bromine elementary substance blowing-out unit, a bromine elementary substance absorption and enrichment unit and a bromine rectification and purification unit which are sequentially connected in series, the pipelines of the units are communicated to form a continuous material channel; the seawater desalination unit is used for producing fresh water and enriching concentrated seawater; the pretreatment unit removes impurities through a security filter and adjusts pH through an acidification pool; the oxidation replacement unit mixes chlorine and concentrated seawater through a gas-liquid mixer, and a bromine solution is generated in a reaction tank; the stripping tower realizes bromine gas stripping through atomization spraying, a filler area and a gas distributor; the absorption tower enriches bromine into hydrobromic acid by using a sulfur dioxide aqueous solution; the rectification unit is oxidized by a distillation tower, condensed and separated to obtain liquid bromine. The method realizes synchronous recovery of fresh water and bromine resources, conforms to a green circulation concept, and has remarkable economic and ecological benefits.

The invention relates to the technical field of quartz sand purification, in particular to a green and efficient purification method of high-purity quartz sand, which comprises four steps of mechanical-chemical synergistic pretreatment, microwave-assisted deep impurity removal, directional adsorption purification and ultrapure water washing and drying. The traditional hydrofluoric acid process is replaced by the composite organic acid, so that the COD (Chemical Oxygen Demand) of the wastewater is reduced by more than 90%, the waste liquid treatment cost is greatly reduced, meanwhile, the problem of corrosion of strong acid to equipment is avoided, the energy consumption is reduced by 40% through the microwave process, and no chlorine is discharged, so that the production process is more environment-friendly and safer, the content of Al2O3 is reduced from 500ppm to 8ppm, and the production cost is reduced. Compared with the prior art, the method provided by the invention has the advantages that the content of Fe2O3 is reduced from 200ppm to 3ppm, meanwhile, the inclusion removal rate is greater than 99.5%, and the purity of SiO2 reaches 99.995%, so that the problem that micron-sized inclusion impurities are difficult to deeply remove is solved, and the purification efficiency is greatly improved.

The application belongs to the technical field of organic synthesis, and particularly relates to a preparation method of 5-chloro-2-methyl-4-isothiazoline-3-ketone. N,N'-dimethyl-3,3'-dithiodipropionamide is mixed with ethyl acetate, cooled to 8-10 DEG C, and chlorine is added in stages, and the reaction is continued after the chlorine is passed; the adding mode of the chlorine is as follows: in the first stage, 25-30% of the chlorine is passed in 0.5h while maintaining the temperature of the reaction system at 10-12 DEG C; in the second stage, 25-30% of the chlorine is passed in 1h while maintaining the temperature of the reaction system at 13-14 DEG C; and in the third stage, the remaining chlorine is passed in 1.5h while maintaining the temperature of the reaction system at 15-18 DEG C. The application controls the generation of 5-chloro-2-methyl-4-isothiazoline-3-ketone by controlling the adding amount of the chlorine and the reaction temperature, and improves the yield of 5-chloro-2-methyl-4-isothiazoline-3-ketone.

The present invention provides a method of producing hydrochloric acid, comprising reacting high-temperature gaseous chlorine and water vapour in a carbon-free reverse Deacon reaction (RDR) at a temperature of from about 450 to about 750 °Celsius to produce a mixture of gases comprising hydrogen chloride and oxygen. The chlorine is produced by fusing and electrolysing sodium or magnesium chloride in solid phase. The water vapour comes from thermally decomposing a hydroxide of at least one of calcium, magnesium and iron in the absence of oxygen to produce the water vapour without any admixture of oxygen (e.g., from atmospheric air). The mixture of gases produced by the RDR is immediately contacted with liquid water to dissolve the hydrogen chloride therein, thereby producing hydrochloric acid and a stream of tail gases. Heat is extracted from the hydrochloric acid to maintain its temperature substantially constant until the stream of tail gases is no longer in contact therewith. Thus the chlorine and water vapour are both supplied to the RDR at high purity and require little, if any, preheating. Heat extracted from contacting the mixture of gases with liquid water may be used to keep the RDR within its range of operating temperatures. Oxygen can be separated from the stream of tail gases, and the oxygen-depleted stream can be recycled back to the RDR to give a high percentage conversion of chlorine to hydrogen chloride. The RDR may be uncatalysed and kept within its operating temperature range by radio-frequency volumetric heating in at least one of the IEEE Ku-, K- and Ka-bands. The invention also provides a corresponding apparatus (1h) for producing hydrochloric acid, comprising an electrolytic cell (10) for the electrolysis, a gas-tight kiln (20) for the thermal decomposition, a gas-phase reactor (30) for the RDR, and an absorber (40) for dissolving the hydrogen chloride in the liquid water. The apparatus (1h) may further comprise a separator (80) for separating the stream of tail gases into the oxygen-depleted stream and a stream of oxygen, which may be fed to a steelmaking apparatus (90), for example. The liquid water for dissolving the hydrogen chloride can come from condensing water vapour obtained by drying an aqueous solution of sodium or magnesium chloride or of sodium hydroxide. The apparatus (1h) may therefore also comprise a dryer (60) for drying this aqueous solution, and a condenser (70) for condensing the water vapour thus obtained. Sodium chloride or magnesium chloride in solid phase derived from drying the aqueous solution may be recycled back to the electrolytic cell (10). Electricity for the electrolysis can come from a renewable resource. At least some of the heat for the thermal decomposition may come from the liquid metal which is a co-product of the electrolysis. The invention is therefore highly energy efficient and requires little, if any, extra energy, apart from the electricity required for the electrolysis. The invention also uses commonly available ingredients and produces no greenhouse gases.

The invention relates to the technical field of p-fluorobenzaldehyde production, and particularly discloses a production process of high-purity p-fluorobenzaldehyde. The invention relates to a production process of high-purity p-fluorobenzaldehyde. The production process comprises the following steps: S1, carrying out a chlorination reaction by taking p-fluorotoluene and chlorine as raw materials to prepare a mixed chlorination solution of p-fluoromethyl benzyl monochloride, p-fluoromethyl benzyl dichloride and p-fluoromethyl benzyl trichloride; s2, adding an organic complexing agent, which is a water-soluble aprotic solvent, into the mixed chlorinated liquid prepared in the step S1, and then performing vacuum rectification to obtain distillate and residual liquid; rectifying by taking the residual liquid as a raw material to obtain kettle liquid and rectified liquid; and S3, carrying out hydrolysis reaction by taking the rectification liquid and water as raw materials, separating, and drying to obtain the product. The production process of the high-purity p-fluorobenzaldehyde has the advantages of high raw material conversion rate, high product purity and few three-waste products.

The invention discloses a spinel type catalyst for preparing chlorine through electro-catalysis and a preparation method of the spinel type catalyst, and relates to the technical field of electro-catalysis materials. The catalyst is a nickel-doped cobalt spinel oxide, the chemical general formula of the catalyst is NixCo3-xO4, the value range of x is 0.4-0.6, the crystal structure of the catalyst belongs to a cubic system spinel structure, and nickel ions selectively occupy octahedral sites in spinel crystal lattices and partially replace original Co < 3 + > ions. The spinel type non-noble metal catalyst with high chlorine evolution activity, high selectivity and good stability is constructed by accurately controlling the nickel doping concentration and optimizing hydrothermal and annealing process parameters.

The utility model discloses an easy dismounting chlorine gas supply filter unit relates to chlorine gas supply filter technical field, including filter box and positioning assembly, the front and back both sides of filter box are provided with filter assembly, positioning assembly sets up in the upper and lower both sides of filter box, and positioning assembly includes side plate, central shaft, pressing plate, guide portion and push rod. That easy dismounting chlorine gas supply filter unit through the setting of positioning assembly, when maintaining, need not with the aid of other tools, only need to push push rod to make pressing plate with central shaft as center rotation, remove from the outside of the sealing plate, at this time, pull handle can take out multiple filter plates from filter box simultaneously, thereby need not single one by one dismount, be favorable to improve the convenience when maintaining, and when installing, also only need to push back push rod, at this time, guide portion will play the guiding role when pressing plate moves to sealing plate, thereby drive pressing plate to compress sealant strip, seal between sealing plate and filter box.

The present application relates to a kind of catalyst for hydrogen chloride oxidation preparation chlorine and its preparation method and application.The preparation method includes: after carrier substrate, metal tantalum powder, binder solution are mixed, extrusion forming is obtained green body, the green body is prepared composite carrier by calcination, the mass fraction of metal tantalum powder in the composite carrier is 5%-30%;Inorganic salt containing catalytically active element is made into solution and is placed in the composite carrier, and after drying, pre-product is obtained, and the pre-product is prepared catalyst by calcination.The preparation method described in the present application prepares high thermal conductivity composite carrier, not only effectively improves the heat conduction efficiency of catalyst, guarantees the effective activity of catalyst, but also guarantees the stability of composite carrier, thereby effectively prolongs the life of catalyst.