594 results about "Hydrogen chloride" patented technology

The invention discloses a high-temperature dechlorinating agent for removing hydrogen chloride gas and a preparation method of the high-temperature dechlorinating agent, and belongs to the technical field of dechlorinating, and the preparation method of the high-temperature dechlorinating agent for removing the hydrogen chloride gas comprises four steps of preparing sepiolite-loaded active calcium powder, preparing copper-aluminum coated calcium carbonate whiskers, forming and roasting. According to the high-temperature dechlorinating agent for removing the hydrogen chloride gas, the penetration chlorine capacity is 78.5 to 81.7 percent, the crushing strength is 142 to 160N. Cm <-1 >, and the abrasion rate is 0.8 to 1.2 percent.

The application provides a high-chlorine solid waste treatment method and device based on pressure baking, and belongs to the field of solid waste disposal. The method is specifically as follows: high-chlorine solid waste is subjected to pressure baking at 250 DEG C to 400 DEG C, so that the high-chlorine solid waste is converted into baked coke, volatile matter and hydrogen chloride, and then the hydrogen chloride is absorbed to realize high-chlorine solid waste treatment. The application utilizes the pressure baking mode to treat high-chlorine solid waste, can realize efficient removal of chlorine at a lower temperature, and has higher dechlorination efficiency compared with atmospheric pyrolysis dechlorination, so that higher dechlorination efficiency is obtained while reducing treatment energy consumption, and is suitable for various types of high-chlorine solid waste. Meanwhile, the method can also obtain clean and high-quality baked coke, so that high-chlorine solid waste is deoxidized and upgraded, chlorine is released in the form of HCl at a lower temperature, the difficulty of subsequent chlorine removal is reduced, and reliability is enhanced.

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 present application relates to a kind of methods for preparing ultra-high purity quartz sand by deep purification, belong to high-purity quartz high-efficiency preparation and non-metallic mineral fine and deep processing technical field.The method is placed in supercritical reaction device with quartz sand raw material, and mixed fluid of composite entraining agent and supercritical carbon dioxide is introduced into the device to carry out reaction, after separation, washing and drying, high-purity quartz sand product is obtained;The composite entraining agent is the combination of acid medium and metal complexing agent;The volume fraction of the acid medium in the mixed fluid is 0.5%~5%, and the acid medium is hydrogen fluoride and / or hydrogen chloride.The method has the advantages of simple process flow, high purification efficiency, controllable purification degree and stable product performance.

The invention provides a method for preparing p-chloromethyl styrene, which comprises the following steps: (1) in the presence of a catalyst and an assistant, carrying out reaction on paraformaldehyde and hydrogen chloride to obtain a chloromethylation reagent; (2) reacting beta-halogenated ethyl benzene with the chloromethylation reagent obtained in the step (1) to obtain chloromethyl halogenated ethyl benzene; (3) adding an extracting agent into the chloromethyl halogenated ethylbenzene reaction liquid obtained in the step (2) for extraction to obtain an oil layer containing chloromethyl halogenated ethylbenzene and a water-containing acid layer, and crystallizing the oil layer to obtain purified p-chloromethyl halogenated ethylbenzene; and (4) in the presence of a solvent, carrying out elimination reaction on the purified p-chloromethyl halogenated ethyl benzene and alkali to obtain p-chloromethyl styrene.

The utility model provides an acetoxyacetyl chloride synthesizer which comprises a first synthesis kettle and a second synthesis kettle, the top of the first synthesis kettle and the top of the second synthesis kettle are both communicated with a first metering tank and a second metering tank through pipelines, and the first metering tank and the second metering tank are both provided with feeding pumps. The bottom of the first synthesis kettle and the bottom of the second synthesis kettle are communicated with a rectifying kettle through pipelines, a rectifying assembly is arranged at the top of the rectifying kettle, and a discharge port is formed in the bottom of the rectifying kettle; the whole device is simple in structure, the two synthesis kettles can be alternately used, so that the production efficiency is effectively improved, acidic mixed waste gases such as sulfur dioxide and hydrogen chloride are not generated, the utilization rate of raw materials theoretically reaches 100%, the device completely conforms to an environment-friendly and pollution-free green process, the reaction process is mild, and the production cost is low. The reaction speed can be controlled by controlling the temperature and the catalyst input amount, the production operation is safe, the production cost is low, and the benefit is high.

The utility model provides a system for measuring trace hydrogen chloride in hydrogen, the system comprises a drainage module, an absorption module and an analysis module, the drainage module can stably lead out the hydrogen to be detected from a main pipeline, the sampling is accurately controlled, and the accuracy and safety of the sampling are ensured; the absorption module can rapidly absorb hydrogen chloride in hydrogen to form liquid to be detected, the absorption process is stable and reliable, and the accuracy of subsequent analysis is ensured; the analysis module comprises a standard liquid storage unit and an ion chromatography unit, the formed to-be-detected liquid and standard liquid can be accurately analyzed, the ion chromatography unit can accurately measure the concentration of trace hydrogen chloride, and the reliability and accuracy of a detection result are ensured.

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 discloses a method for preparing nano calcium carbonate by using fluorite leachate, and belongs to the technical field of hydrometallurgy. According to the method, metallurgical-grade fluorite is subjected to magnetic separation iron removal and hydrochloric acid solution leaching, high-purity fluorite and a calcium chloride solution are obtained, and meanwhile carbon dioxide gas is generated; removing impurities from the calcium chloride solution, reacting the calcium chloride solution with an ammonium carbonate solution to form a calcium carbonate emulsion, aging the calcium carbonate emulsion, filtering and separating to obtain nano calcium carbonate and filtrate; heating the filtrate to generate hydrogen chloride and ammonia gas, absorbing hydrogen chloride by water to form a hydrochloric acid solution, and recycling; ammonia gas and carbon dioxide are absorbed by water to generate an ammonium carbonate solution for recycling. According to the method, the metallurgical-grade fluorite is purified, meanwhile, the nano calcium carbonate product with the high additional value is prepared through the fluorite leaching solution, cyclic utilization of hydrochloric acid, ammonium carbonate and the like can be achieved, and the method has the advantages of being environmentally friendly, capable of saving energy, reducing consumption, simple, efficient and the like and is beneficial to large-scale application and popularization.

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.

The invention belongs to the technical field of coal ethylene glycol, and particularly relates to a process and a device for finely removing impurities from carbon monoxide after cryogenic separation of synthesis gas, the device comprises an impurity removal device, the impurity removal device comprises a desulfurization tank, a dechlorination tank and a decarbonylation tank which are sequentially connected in series, or an adsorption tower which is sequentially filled with desulfurization, dechlorination and decarbonylation adsorbents; the impurity removal device is arranged to remove trace hydrogen sulfide, hydrogen chloride, carbonyl iron and carbonyl nickel in CO after cryogenic separation, so that ppb-level removal of impurities in CO is realized, poisoning of a downstream dimethyl oxalate (DMO) synthesis catalyst is avoided, the service life of the catalyst is prolonged, the production cost of an enterprise is reduced, and the operation stability of the device is improved.

The application discloses a continuous production process and equipment for a trifluoromethylbenzene tower, and belongs to the field of organic fluorine chemistry. The production process comprises the following steps: S1: continuously feeding trichloromethylbenzene and hydrogen fluoride into a tower reactor connected with a heat exchanger circulating cooling system in a reverse direction, so that a three-stage continuous fluorination reaction occurs in the tower reactor to obtain crude trifluoromethylbenzene, and unreacted hydrogen fluoride is separated into liquid at the top of the tower and then flows back into the tower reactor; S2: the crude trifluoromethylbenzene obtained in the reaction is subjected to nitrogen bubbling in a bubble tower, and then is continuously distilled in a rectifying tower to obtain finished trifluoromethylbenzene; and S3: byproduct hydrogen chloride generated in the fluorination reaction is introduced into a hydrochloric acid tank to obtain hydrochloric acid, and the content of hydrofluoric acid in the hydrochloric acid is less than 1000 ppm. The method can greatly improve the utilization rate of raw material hydrogen fluoride, improve the purity of byproduct hydrochloric acid, reduce the generation amount of waste acid, avoid the sharp change of pressure in the reaction process, and realize large-scale, continuous, stable and safe production of trifluoromethylbenzene.

The present application belongs to the field of hydrochloric acid concentration equipment, and particularly relates to a chlorinated polyethylene production process by-product hydrochloric acid concentration system, which comprises a resolving tower and a condensing section dilute hydrochloric acid input tank, the condensing section dilute hydrochloric acid input tank is connected with an absorption tank and a dilute hydrochloric acid buffer tank, the output end of the dilute hydrochloric acid buffer tank is connected with the liquid input end of the resolving tower, the gas input end of the resolving tower is connected with a reboiler, the gas output end of the resolving tower is connected with the absorption tank, and the output end of the absorption tank is connected with a concentrated hydrochloric acid storage tank. The present application divides the condensed dilute hydrochloric acid generated in the condensing section of the chlorinated polyethylene production process into three parts, reduces the types of system raw materials, reduces the difficulty of material preparation, increases the concentration of dilute hydrochloric acid through the resolving formed hydrogen chloride, improves the concentration of hydrochloric acid, and improves the economic value of the product.

The invention discloses a device and method for synthesizing a fourth-generation refrigerant R1235ze through photocatalysis of VDF, and belongs to the technical field of green chemical engineering. The core of the method is that a g-C3N4 / BiVO4 heterojunction photocatalyst is adopted to catalyze VDF to react with hydrogen chloride to generate R1234ze under the mild condition of 70-90 DEG C under the irradiation of simulated sunlight (AM1.5 G). The catalyst is prepared by taking melamine, bismuth nitrate and ammonium metavanadate as precursors and carrying out hydrothermal reaction and calcination treatment under specific conditions. The matched industrial system realizes the whole process integration from the continuous preparation of the catalyst to the online separation of the product. According to the method, the reaction temperature is successfully reduced to about 80 DEG C from traditional 400 DEG C or above, energy consumption is reduced by about 75%, CO2 emission is reduced by about 60%, meanwhile, the product selectivity is not lower than 93%, the quantum efficiency is not lower than 12%, the purity reaches up to 99.5% or above, and a subversive solution is provided for green and low-cost industrial production of R1234ze.

The application relates to the technical field of organic synthesis, and discloses a synthesis method of benzthiazuron, which comprises the following steps: step 1, addition reaction of alpha-methyl styrene and hydrogen chloride gas, and degassing to obtain a first reaction liquid; step 2, substitution reaction of the first reaction liquid and cyanate in the presence of a zinc chloride catalyst, and filtration to obtain a second reaction liquid containing isocyanate; and step 3, construction of an inorganic salt aqueous solution system with a density of 1.05-1.10 g / ml and a pH of 9-10, dropwise addition of the second reaction liquid into the system for condensation reaction with o-chlorobenzylamine, and post-treatment and refinement to obtain a target product. The non-phosgene route of chloro-isocyanate substitution is adopted, and the use of the toxic phosgene is completely avoided; the salting-out effect and interface control generated by the specific high-density salt solution effectively inhibit the isocyanate hydrolysis side reaction, and the reaction yield and product purity are obviously improved.

The invention relates to the technical field of cleaning agents, in particular to a method for cleaning a titanium tetrachloride preheater. According to the method for cleaning the titanium tetrachloride preheater, provided by the invention, the titanium tetrachloride preheater is regularly cleaned by adopting dry ice. Dry ice cleaning is a physical process, a cleaning medium is solid carbon dioxide and does not chemically react with equipment materials (such as Inconel 601 alloy) and residual titanium tetrachloride, the problem that corrosive hydrogen chloride gas is generated by traditional water washing is completely eradicated, and an equipment body is protected. Efficient and lossless cleaning of the titanium tetrachloride preheater can be achieved, and the titanium dioxide quality problem caused by falling of a carbon scale layer of the titanium tetrachloride preheater is thoroughly solved.

The utility model discloses a wastewater treatment device for triazinone production, which belongs to the technical field of triazinone production and comprises a premixing box, a ferrous sulfate inlet, a wastewater inlet and an acid inlet are arranged at the top of the premixing box, the premixing box is connected with a treatment box, a first spraying component is arranged on the upper portion of the inner wall of the treatment box, and two rotating rods are arranged in the treatment box side by side. A driving piece for driving the rotating rods to rotate is arranged on the two rotating rods, a plurality of conical rods are arranged on the rotating rods, and a liquid outlet is formed in the bottom end of the treatment box; the treatment box is connected with a gas treatment box through a gas outlet pipeline, a gas outlet is formed in the gas treatment box, a second spraying component is arranged at the top end of the inner wall of the gas treatment box, and a liquid outlet is formed in the bottom end of the gas treatment box. A small amount of bubbles generated in the treatment box are punctured through rotation of the conical rod, the bubbles are prevented from being gathered into foam to overflow and corrode the device, volatilized hydrogen chloride is guided into the gas treatment box to absorb hydrogen chloride gas, and environment pollution is avoided.

The application discloses a ship polyvinyl chloride sheath cable and a preparation method thereof, and relates to the technical field of polyvinyl chloride sheath cables. Firstly, 2-vinylbenzoic acid and epichlorohydrin are subjected to ring-opening esterification reaction, and the two are combined together through the chemical reaction. Then, sodium hydroxide is added to the reaction system, and the reaction is further promoted to the direction of generating an epoxy group by removing hydrogen chloride, so that an epoxy group is successfully introduced into the molecular structure of 2-vinylbenzoic acid, and a multifunctional additive is prepared. The newly developed additive is applied to the production process of the ship polyvinyl chloride sheath cable, so that the cable has the characteristics of oil resistance, water resistance and corrosion resistance, and the flame retardation performance and long-term antioxidant capacity of the cable are significantly improved.

The invention discloses a hydrogen chloride gas absorption device-modified double-path pure water absorption system and a process method, and relates to the technical field of chemical waste gas treatment and resource recovery. The device comprises a hydrochloric acid synthesis furnace, a first-stage falling film absorber, a second-stage falling film absorber, a combined tail gas absorption tower and a tail gas purification unit which are sequentially connected, as well as a pure water supply system and an automatic control system. The system is characterized in that the pure water supply system is divided into two independent branches through a water inlet header pipe to be connected to the combined tail gas absorption tower, and each branch is provided with an automatic regulating valve. According to the method, a traditional single-path water absorption system is transformed into a double-path standby system through low-cost technical improvement of an existing single-path absorption device, automatic and rapid switching to the other path when one path breaks down is achieved, and therefore the problems that in the prior art, production is discontinuous, product concentration fluctuation is large, and potential safety hazards exist are effectively solved; the effects of efficiently, continuously and safely producing high-concentration hydrochloric acid and realizing near-zero emission of tail gas are achieved.

A method for recycling catalytic metals comprising: collecting a plurality of spent catalytic metals, wherein the spent catalytic metals contain cathodes of NMC111, NMC622, NMC811, NCA, LCoO2, LiNi0.5Mn1.5O4, LiMnO4, LiNiO2, LiMn2O4, and / or LiMnO2 compositions; subjecting the plurality of spent catalytic metals to a green mixture, wherein the green mixture includes dihydrogen phosphite and water, phosphoric acid and water, sulfuric acid and water, hydrogen chloride and water, or nitric acid and water, at temperatures of between 80 and 120° C. to form a metal leachate solution; and recovering lithium (Li) from the metal leachate solution.

The invention belongs to the technical field of acyclic compounds, and particularly relates to a method for preparing chloroacetic acid by hydrogenation reduction of dichloroacetic acid, which comprises the following steps: A1, adding a chlorination liquid containing dichloroacetic acid into a raw material storage tank, mixing with hydrogen, and heating to obtain a mixed material; a2, conveying the mixed material into a hydrogenation reactor loaded with a composite metal modified catalyst for reaction to obtain chloroacetic acid liquid and mixed gas; and A3, conveying the mixed gas to a stripping tower, condensing the mixed gas through a condenser to obtain hydrogen chloride gas and condensate, and conveying the condensate to the hydrogenation reactor again for recycling. According to the method disclosed by the invention, a byproduct, namely the chlorination liquid, generated in a chlorination reaction in a chloroacetic acid production process is used as a reaction raw material, dichloroacetic acid and trichloroacetic acid in the chlorination liquid can be effectively reduced into chloroacetic acid, and other substances in the chlorination liquid cannot be influenced.

This invention provides a tert-nonylthiol and its synthesis method. The synthesis steps are as follows: nonene and hydrogen sulfide are preheated separately, then the preheated nonene and hydrogen sulfide are mixed, and the mixture is reacted under the action of a catalyst to obtain tert-nonylthiol. The preheating temperature of nonene is 40-50℃, and the preheating temperature of hydrogen sulfide is 50-60℃. This invention provides mild reaction conditions and precise preheating of nonene and hydrogen chloride separately. The product prepared by this method has a purity of over 99.0%, meeting the requirements of high-end industrial applications for high-purity tert-nonylthiol.

The utility model discloses a system of reducing hydrogen chloride content in organic silicon hydrolyzate, characterized in that it comprises dimethyl hydrolyzate storage tank, moisture adsorption tower and HCL adsorption tower, the dimethyl hydrolyzate storage tank is connected with the top feed inlet of moisture adsorption tower through hydrolyzate delivery pump, the bottom discharge port of moisture adsorption tower is connected with the top feed inlet of HCL adsorption tower through first filter and moisture adsorption tower bottom pump in proper order, the bottom discharge port of HCL adsorption tower is connected with product storage tank for storing high-purity siloxane through second filter and HCL adsorption tower bottom pump in proper order, a water content detection sampling point is arranged on the connecting pipeline between moisture adsorption tower bottom pump and HCL adsorption tower, an HCL content detection sampling point is arranged on the connecting pipeline between HCL adsorption tower bottom pump and product tank, and the advantage is that water and HCL in dimethyl hydrolyzate are adsorbed and removed, and product purity is improved.

The utility model relates to the technical field of tail gas absorption, in particular to a liquid hydrogen chloride steel cylinder tail gas absorption device. The liquid hydrogen chloride steel cylinder tail gas absorption device comprises a falling film absorber, the falling film absorber is connected with an acid liquor circulating tank through a U-shaped bent pipe, an absorption area and a liquid outlet area are arranged in the falling film absorber, the acid liquor circulating tank is connected with the absorption area through a pipeline, a hydraulic jet pump is arranged above the acid liquor circulating tank, and the liquid outlet area is connected with the absorption area through a pipeline. The liquid outlet area is connected with the hydraulic jet pump through a connecting pipeline. Through the synergistic effect of the falling film absorber, the acid liquor circulating tank, the hydraulic jet pump and the like, the device realizes efficient absorption of the tail gas of the hydrogen chloride steel cylinder. Due to the design of the absorption area and the liquid outlet area in the falling film absorber and the arrangement of the tubes, hydrogen chloride gas is in full contact with absorption water, the absorption efficiency is greatly improved, the content of hydrogen chloride in tail gas is effectively reduced, and pollution to the environment is reduced.

The present application provides a batch production method and system for preparing electronic-grade hydrogen chloride by using hydrogen chloride gas by-produced from chlorinated ethylene, and relates to the field of electronic-grade hydrogen chloride preparation. The batch production method for preparing electronic-grade hydrogen chloride by using hydrogen chloride gas by-produced from chlorinated ethylene comprises sequentially performed de-ethylene treatment, de-watering treatment, de-carbon treatment, de-impurity treatment and de-dust treatment. The batch production method and system can effectively adapt to the fluctuation of impurity content in hydrogen chloride gas by-produced from chlorinated ethylene, and has strong process adaptability. The residual chlorinated organic impurities in hydrogen chloride gas by-produced from chlorinated ethylene can be effectively removed, the purity and impurity content of the prepared hydrogen chloride product meet the quality requirements of electronic-grade hydrogen chloride, the quality of the prepared hydrogen chloride product is stable, and the large-scale industrial processing requirements can be met.

The invention belongs to the technical field of medicine synthesis, and particularly relates to a method for efficiently preparing cyclobutane derivatives. Comprising the following steps: dissolving 4-chloro-7H-pyrrolo [2, 3-d] pyrimidine and chloromethyl pivalate in 1, 4-dioxane, and adding an acid binding agent for reaction to obtain a reaction solution; the preparation method comprises the following steps: adding 1-(1-ethoxyethyl)-4-pyrazol boronic acid pinacol ester, purified water, a catalyst and an acid-binding agent into a reaction kettle, carrying out Suzuki reaction, separating liquid, adding activated carbon into an upper organic phase for decoloration, adding an organic solution containing hydrogen chloride for crystallization, and filtering to obtain a wet product; and dissolving the wet product and 2-[1-(ethylsulfonyl)-3-azacyclobutane] acetonitrile in 1, 4-dioxane, and reacting under an alkaline condition to obtain the cyclobutane derivative. According to the preparation method, synthesis is performed through a one-pot four-step reaction, a solvent only relates to 1, 4-dioxane and water, and post-treatment is simple, convenient and efficient.

The invention relates to a device for reducing moisture of a hydrogen chloride product in a steel cylinder and a use method.The device comprises the steel cylinder, one end of the steel cylinder is connected with a main pipeline, the main pipeline is provided with a plurality of branch pipes, the branch pipes comprise a filling pipe, a recycling pipe, a tail gas treatment pipe, a vacuum treatment pipe and a gas analysis pipe, and the main pipeline is connected with an inlet pipeline at one end of the steel cylinder; a heating device is further laid outside the steel cylinder. The method has a function of removing residual liquid moisture in a hydrogen chloride steel cylinder filled for multiple times, can further reduce the moisture of a hydrogen chloride product in the steel cylinder and prolong the service life of the steel cylinder on the premise that the earlier-stage treatment process of the steel cylinder is in place, is low in cost and pollution-free, is simple and feasible, does not introduce other impurities, does not relate to treatment of other impurities, and is suitable for industrial production. Existing equipment does not need to be modified at all, equipment transformation cost does not exist, only filling and recycling treatment cost exists, and products can be continuously produced through recycling.

The invention discloses a method for preparing vinyl chloride by electrocatalytic dechlorination of 1, 2-dichloroethane, a working electrode of the method takes a metal oxide as a catalyst, and the metal oxide is selected from at least one of the following metal oxides: Pd, Mn, Fe, Co, Ni, Cu, Ru and Mo. According to the invention, the metal oxide powder is used as the electrocatalyst, the catalyst is coated on the electrode material to prepare the working electrode, the working electrode is applied to electrocatalytic dechlorination reaction of 1, 2-dichloroethane, vinyl chloride can be generated at high selectivity at room temperature, a new way is opened up for production of vinyl chloride by electrocatalytic dechlorination, and the method has wide application prospect. And a green and low-cost solution is provided for efficient synthesis of vinyl chloride.

The invention discloses a low-temperature dehydration method of hydrous magnesium chloride and anhydrous magnesium chloride, comprising the following steps: contacting hydrous magnesium chloride with ammonium chloride to obtain a mixed dehydrated raw material; and heating the mixed dehydrated raw material, and keeping the temperature for a certain time after the mixed dehydrated raw material reaches a set temperature until water in the water-containing magnesium chloride is removed. The invention also provides the anhydrous magnesium chloride prepared by the method. According to the method, synthesis of carnallite is not needed, hydrogen chloride protective gas is not needed, dehydration can be achieved through independent ammonium chloride, equipment is hardly corroded, the operation environment is good, and anhydrous magnesium chloride is prepared under the mild condition.

The invention discloses a triphosgene continuous synthesis method and device, and belongs to the technical field of fine chemical production. The triphosgene continuous synthesis method comprises the following steps: S1, continuously conveying dimethyl carbonate to the lower part of a reactor, and continuously inputting chlorine from the bottom of the reactor; s2, after dimethyl carbonate and chlorine are mixed in a reactor, a reaction is initiated by irradiation of an ultraviolet light source with the wavelength of 295-395 nm, and molten triphosgene and hydrogen chloride gas are generated; wherein the temperature in the reactor is gradually increased from bottom to top to present a temperature gradient; and S3, continuously overflowing the molten-state triphosgene into a degassing tower to remove residual hydrogen chloride in vacuum, and enabling the degassed molten-state triphosgene product to enter a flaking section. According to the method, by optimizing reaction conditions and equipment design, the cost can be reduced, the utilization rate of raw materials can be increased, generation of byproducts can be reduced, meanwhile, the safety and efficiency of the reaction are guaranteed, and efficient, safe and continuous production of triphosgene is achieved.