100 results about "Carbon tetrachloride" patented technology

The invention relates to the technical field of chemical recovery, and particularly discloses a carbon tetrachloride removal system and process, the system comprises a washing tower and a carbon tetrachloride removal assembly, the washing tower is used for introducing a solvent and a phosgene material; the tower top of the washing tower is used for outputting treated substances; a tower kettle of the washing tower is communicated with the carbon tetrachloride removal assembly, and the carbon tetrachloride removal assembly is used for removing carbon tetrachloride in materials from the washing tower. The solvent is introduced into the washing tower to wash the phosgene material, and after the solvent is introduced, the washing tower is not pure phosgene equipment, so that the safety performance is improved; and compared with the prior art that carbon tetrachloride is removed by utilizing a phosgene rectifying tower and a solvent refining tower, the combination of the washing tower and the carbon tetrachloride removal assembly is beneficial to reducing the energy consumption.

The invention provides a preparation method of triphenylchloromethane, and belongs to the technical field of medical intermediates. The preparation method comprises the following steps: preparing a suspension from pure benzene, a composite catalyst and an adsorbent, dropwise adding carbon tetrachloride to obtain a reaction solution, heating the reaction solution to 60-80 DEG C, treating with 808nm laser while stirring, and performing post-treatment to obtain the triphenylchloromethane. The composite catalyst catalyzes pure benzene and carbon tetrachloride to react to generate triphenylchloromethane, hydrogen chloride is released, the adsorbent can adsorb hydrogen chloride in situ, and acid corrosion and catalyst poisoning can be prevented while forward proceeding of the reaction is maintained; the composite catalyst and the adsorbent are used for realizing catalysis-adsorption synergistic promotion of forward proceeding of the reaction, so that the dosage of the catalyst is reduced, the reaction time is shortened, the output of wastewater is reduced, and the reaction yield and the purity of triphenylchloromethane are improved.

The present invention relates to a Ru-Ni bimetallic catalyst for the selective hydrogenation of a quinoline organic hydrogen storage carrier, and a preparation method therefor and the use thereof. In the catalyst, carbon nitride is used as a carrier, and metal nanoparticles Ru and Ni serve as active components and are jointly loaded on the carbon nitride carrier; and the carbon nitride is prepared by mixing carbon tetrachloride, ethidene diamine and nano-silica, reacting same to obtain a carbon nitride polymer, then calcining same at 750-850ºC, performing a desilicification treatment, and then filtering and drying same. The catalyst provided in the present application has good catalytic hydrogenation performance in the selective hydrogenation of the quinoline organic hydrogen storage carrier and can achieve the omission of a solvent in a reaction system; the reaction is simple, green and environmentally friendly, and the gravimetric hydrogen storage density of the system can be maximally ensured when a quinoline compound is used as an organic hydrogen carrier; moreover, the catalyst also has a good cycling stability.

The invention relates to the technical field of refrigerant raw material preparation, and discloses a novel energy-saving environment-friendly refrigerant raw material preparation system which comprises a raw material preparation and supply unit, a reaction and separation unit and a refining unit which are connected in sequence, the reaction and separation unit comprises a mixer, a reflux device, a reactor, a cooling separation device, a membrane type absorption device and a tail gas tower which are connected in sequence; the refining unit comprises an azeotropic tower, a rectifying tower I and a rectifying tower II which are connected in sequence, and is used for performing dehydration, deacidification and rectifying purification on the separated crude chlorinated liquid to obtain a high-purity carbon tetrachloride product; by optimizing the technological process of the raw material preparation and supply unit, the reaction and separation unit and the refining unit, efficient, environment-friendly and energy-saving production of carbon tetrachloride is realized; the problem that the production raw material carbon tetrachloride of the fourth-generation refrigerant is insufficient is solved, the production cost is reduced, and the production efficiency is improved.

The invention discloses a metal powder injection molding process based on a thermal degreasing adhesive, and belongs to the technical field of metal powder metallurgy molding, and the metal powder injection molding process comprises the following steps: weighing raw materials, preheating and activating to obtain a premixture, melting and mixing to obtain an adhesive, extruding and granulating, obtaining feeding particles, carrying out injection molding to obtain a product green body, sintering and thermally degreasing, and cooling. A pure thermal degreasing process is adopted, dangerous chemical reagents such as nitric acid and oxalic acid do not need to be used, solvents such as n-pentane and carbon tetrachloride do not need to be depended on, in actual production, potential safety hazards in the production link can be greatly reduced, damage to the ecological environment is reduced, meanwhile, the body health of operators is guaranteed, and the production cost is reduced. The core requirements of modern industry on safe and environment-friendly production are met.

The invention provides a pharmaceutical composition for treating liver injury and hepatic fibrosis, and relates to the technical field of biological medicines. The pharmaceutical composition is prepared from a peucedanum decursum extract, a penthorum chinense pursh extract, a spanishneedles herb extract and a nux prinsepiae extract. The pharmaceutical composition shows an excellent protective effect on a carbon tetrachloride induced hepatocyte injury model. The pharmaceutical composition disclosed by the invention has obvious treatment and protection effects on carbon tetrachloride induced rat hepatic fibrosis, and the anti-hepatic fibrosis effect is realized by improving four indexes of liver function and hepatic fibrosis, reducing the level of inflammatory factors in the liver and relieving inflammatory reaction in the hepatic fibrosis process. The pharmaceutical composition disclosed by the invention is expected to be further developed and popularized as a medicine for treating liver injury and hepatic fibrosis.

The invention relates to the technical field of chemical engineering, and particularly discloses a vaporizer used in a refining process, which comprises a vaporization container for storing carbon tetrachloride; a plurality of circles of annular access holes are formed in the vaporization container in a penetrating manner; the outer surface of the vaporization container is communicated with the annular access hole and is hermetically and fixedly connected with a plurality of semicircular pipes; a plurality of semicircular pipes are sealed on the outer surface of the vaporization container and are hermetically and fixedly connected with a heat preservation cover; the vaporizing container and the semicircular pipe are communicated through the multiple circles of annular inlet and outlet holes, so that the contact area between the vaporizing container and the outside is increased, the vaporizing container can be heated more rapidly through a heat tracing band, and hot water can be injected into the heat preservation cover to heat the vaporizing container and the semicircular pipe; and the bottom of the vaporization container can be heated in a water bath heating mode, so that the heating modes are diversified, the contact area of the vaporization container is enlarged through the semicircular pipe, the heating efficiency is improved, the heating modes are multiple, and heat supply modes of different users are adapted.

The application belongs to the technical field of two-dimensional material preparation, and particularly relates to a preparation method of a transition metal sulfide two-dimensional material. The preparation method provided by the application comprises the following steps: taking a transition metal sulfide as a target material, taking a polysiloxane material as a substrate, and performing physical vapor deposition to obtain a polysiloxane material-transition metal sulfide composite material; the polysiloxane material-transition metal sulfide composite material comprises a polysiloxane material and a transition metal sulfide two-dimensional material film loaded on the surface of the polysiloxane material; the polysiloxane material comprises one or more of methyl silicone oil, ethyl silicone oil and phenyl silicone oil; carbon tetrachloride is used to dissolve the polysiloxane material in the polysiloxane material-transition metal sulfide composite material to obtain the transition metal sulfide two-dimensional material. The application uses a liquid polysiloxane material as a substrate to load the transition metal sulfide, breaks through the shortcoming of small size of the two-dimensional material in the prior art, and can freely control the thickness of the two-dimensional material.

This invention discloses a method for preparing 4-(trifluoromethylsulfinyl)pyrazole compounds, comprising: dissolving terminal alkyne in n-hexane under nitrogen atmosphere, adding anhydrous zinc chloride, and reacting trifluoromethylsulfinyl chloride to obtain α-trifluoromethylalkynyl sulfoxide; adding benzoyl chloride dropwise to a CH2Cl2 solution of phenylhydrazine and triethylamine under nitrogen atmosphere to obtain acylhydrazine; adding carbon tetrachloride to a suspension of acylhydrazine and triphenylphosphine in acetonitrile to obtain hydrazone chloride; and reacting α-trifluoromethylalkynyl sulfoxide, hydrazone chloride, potassium carbonate, and anhydrous ethanol at room temperature to obtain 4-(trifluoromethylsulfinyl)pyrazole compounds. This invention uses inexpensive and readily available raw materials, the entire reaction route is mild and simple to operate, does not require stringent reaction conditions, and most of the reaction process is carried out at room temperature. The product yield is high, and the prepared trifluoromethylalkynyl sulfoxide pyrazole structure has multiple derivatization sites, showing good application prospects.

The application discloses a synthesis method of pentachloropropane based on raw materials of vinyl chloride and carbon tetrachloride, and belongs to the technical field of new chemical materials. Main steps include raw material proportioning and pretreatment, nano-catalytic reaction, product initial extraction and purification, etc. The catalyst used is prepared by loading the composite of ferrous chloride and nano iron oxide on a mesoporous carbon carrier, and has excellent catalytic performance. The product is purified through vacuum distillation and an activated carbon adsorption column, and the purity can reach more than 99.7%. The method innovatively combines nano technology and specific reaction conditions, and has the advantages of high yield, high product purity and good catalyst stability. Compared with the traditional synthesis method, the technology significantly improves the production efficiency and reduces the energy consumption, provides an innovative and practical technical path for the industrial production of pentachloropropane, and has a wide application prospect.

The utility model discloses a reaction system for continuously preparing pentachloropropane and tetrachloropropane, which comprises a reaction kettle, a heat exchanger, a static mixer and a Venturi ejector which are connected in sequence, the reaction kettle comprises a reaction kettle body, a stirring device, a magnetic attraction device and a cooling and heating device, wherein the stirring device, the magnetic attraction device and the cooling and heating device are respectively arranged on the reaction kettle body. According to the utility model, iron powder is skillfully fixed in the reaction kettle and is uniformly distributed, so that a larger contact area between liquid and solid phases is provided, the formation of a divalent iron complex is accelerated, and an effective catalyst is supplemented for a reaction system in time. A large amount of circulating liquid can quickly remove reaction heat, and after newly added carbon tetrachloride and auxiliaries are uniformly mixed, vinyl chloride or ethylene gas is uniformly dissolved in the circulating liquid through the venturi ejector, so that the vinyl chloride or the ethylene gas reacts quickly.

The invention discloses a method for measuring the content of petroleum in a desulfurization solution. The method comprises the following steps: 1) collecting or preparing the desulfurization solution on site; 2) carrying out distillation treatment, dehydration, magnesium silicate adsorption and filtration on the desulfurization solution to obtain a petroleum standard oil sample; or field petroleum is used for dehydration, magnesium silicate adsorption and filtration treatment, and a standard oil sample is prepared; (3) preparing a standard sample series by using the standard samples, and making a standard working curve by using an infrared oil measuring instrument; 4) extracting petroleum in the desulfurized amine liquid by using environment-friendly carbon tetrachloride, and performing oscillation, demulsification, standing, separation, dehydration and magnesium silicate adsorption to obtain an extract; 5, the absorbance is measured and converted through an infrared oil measuring instrument, and the numerical value of the petroleum content in the desulfurization solution is workped.The method belongs to the technical field of component analysis, the implementation process is rapid, simple and convenient, used instruments and agents are stable and low in price, and the requirement for measuring the petroleum content in the desulfurization solution is met.

The invention discloses a polyamido pinene formaldehyde adsorbent and a preparation method thereof, the method comprises the following steps: S1, adding carbon tetrachloride into alpha-pinene, stirring at 0 DEG C, dropwise adding liquid bromine, reacting for a certain time, then washing to remove residual liquid bromine, and performing rotary evaporation to remove carbon tetrachloride to obtain 2, 6-dibromocamphane; s2, dropwise adding m-phenylenediamine into the 2, 6-dibromocamphane, reacting for a certain time at 30 DEG C, and then removing residual m-phenylenediamine by rotary evaporation to obtain polyaminophenene; and S3, loading the polyamido pinene on the base material to obtain the polyamido pinene formaldehyde adsorbent.

This invention discloses an apparatus for producing hydrogen chloride from carbon tetrachloride, belonging to the field of hydrogen chloride process technology. It aims to solve the problem in existing technologies where the reaction of carbon tetrachloride with water produces toxic phosgene if too little water is used, and hydrogen chloride and carbon dioxide gases are produced if too much water is used. Since the boiling points of these two gases are very close at atmospheric pressure, separation is difficult. The apparatus includes a carbon tetrachloride storage tank and a pure water tank, each equipped with a heater. A first valve is installed on the carbon tetrachloride storage tank, and a second valve is installed on the pure water tank. The carbon tetrachloride storage tank is connected to a first heat exchanger, which is connected to a first gas pump. The pure water tank is connected to a second heat exchanger, which is connected to a second gas pump. The second and first gas pumps are connected to a mixing mechanism, which is connected to a tubular hydrolysis reactor. A concentrated sulfuric acid contact tower is connected to the tubular hydrolysis reactor.

The utility model relates to a device for continuously producing 1, 1, 1, 3-tetrachloropropane, which adopts a loop reactor in which a beam pipe is arranged, reaction raw materials ethylene and carbon tetrachloride are mixed at a venturi nozzle at the lower part of the reactor through a gas circulation loop and a liquid circulation loop outside the reactor, and then the mixture is fed into the reactor. And spraying into a reactor filled with a main catalyst. Reaction raw materials are circularly stirred under the action of a beam pipe in the reactor, so that solid, liquid and gas phases are fully mixed. According to the utility model, the gas raw material circulation loop and the liquid raw material circulation loop are adopted for double-circulation mixed reaction, so that the reaction conversion rate and selectivity can be improved, and industrial continuous production can be well realized.

The application provides a kind of hole transport layer, a kind of perovskite solar cell and preparation method, the hole transport layer is polytriarylamine film, the polytriarylamine film is dissolved in carbon tetrachloride and toluene asymmetric binary solvent system by polytriarylamine, is prepared by coating, thermal annealing;In the asymmetric binary solvent system, the volume ratio of carbon tetrachloride and toluene is 100:1 to 1:100.By using carbon tetrachloride and toluene asymmetric binary solvent system to prepare polytriarylamine hole transport layer, effectively inhibit coffee ring effect, improve film flatness and density, reduce interface defects, significantly improve the photoelectric conversion efficiency and long-term thermal and humid stability of perovskite solar cell and assembly.

The invention discloses application of gaboxadol or a pharmaceutically acceptable salt thereof in preparation of a medicine for treating liver fibrosis diseases, and belongs to the technical field of biological medicines, and research shows that the compound can influence collagen fiber crosslinking through targeted inhibition of the function of prolyl-4-hydroxylase a1 (prolyl-4-hydroxylase alpha 1, P4ha1), so that the anti-fibrosis effect is achieved. The invention further discloses an application of the gaboxadol or the pharmaceutically acceptable salt thereof in preparation of the medicine for treating the liver fibrosis diseases, and the application of the gaboxadol or the pharmaceutically acceptable salt thereof in preparation of the medicine for treating the liver fibrosis diseases and the application of the gaboxadol or the pharmaceutically acceptable salt thereof in preparation of the medicine for treating the liver fibrosis diseases. In a carbon tetrachloride induced mouse hepatic fibrosis model, the content of hydroxyproline and collagen deposition in I-type collagen molecules of the liver can be remarkably reduced by injecting the gaboxadol hydrochloride into the intraperitoneal cavity, and the hardness of the liver is reduced. A surface plasma resonance experiment proves that the probe has specific binding capacity with P4ha1. Toxicity experiments show that the compound is good in safety under the effective dosage. Therefore, the invention provides a new drug candidate and a theoretical basis for the treatment of hepatic fibrosis.

The present application relates to the technical field of chemical synthesis, and particularly relates to a preparation method of 4,4'-difluorobenzophenone and a method for synthesizing polyether ether ketone by two steps of carbon tetrachloride. The preparation method of 4,4'-difluorobenzophenone comprises the following steps: under the condition that trifluoromethanesulfonic acid and N-methyl pyrrolidone exist, CCl4 and fluorobenzene are reacted, and the product is hydrolyzed to obtain 4,4'-difluorobenzophenone. The present application solves the problems of high cost, poor environmental protection and performance that cannot meet market requirements of PEEK by innovating raw material route, catalytic system and process parameters, realizes low-cost, green and high-performance synthesis of PEEK, the purity of the prepared DFBP monomer can reach >=99.99%, and the PEEK molecular weight distribution (PDI<=1.9) can be narrowed, and the method is suitable for industrialized production of PEEK materials used in high-end fields such as aerospace, medical devices and electronic and electrical appliances.

This invention discloses a method and system for measuring and calibrating the concentration of an oil mist nano-dispersion, belonging to the field of mechanical testing technology. The invention prepares a nanobubble solution using a porous membrane tube permeation method, employing a ceramic porous membrane tube in conjunction with a pressure tank to control the nanobubble particle size and concentration. A Malvern particle size analyzer is used to measure the solution concentration, which is then adjusted to the desired concentration through proportional dilution. The nanobubble solution is considered equivalent to an oil mist dispersion, and an optical measurement device is built based on the extinction method. A 900nm laser is used to irradiate the solution in a high-transmittance container, and the transmitted light attenuation intensity is measured using an optical power meter. The solvent used is carbon tetrachloride, chloroform, or dichloromethane, and the nanobubble gas is carbon dioxide, water vapor, or methane. The concentration is calculated based on Lambert-Beer's law. This method achieves stable control of oil mist concentration, avoids sampling errors, and improves the calibration accuracy and reliability of the oil mist detector.

This invention discloses a porous activated carbon prepared using balsa wood material, its preparation method, and its application. The porous activated carbon has a pore diameter of 0.4 nm to 400 nm, and the pore volume ratio of micropores (0.4 nm to 2 nm), mesopores (2 nm to 50 nm), and macropores (50 nm to 400 nm) is greater than 30%. The specific surface area of ​​the porous activated carbon is 500 to 700 m² / g. It has an adsorption rate of 130% to 145% for carbon tetrachloride, exhibiting excellent adsorption performance.

The invention belongs to the technical field of organic synthesis, and relates to a method for preparing diphenyl carbonate. According to the method, a deep eutectic solvent (DES) is used as a catalyst, one-pot reaction of CO2, carbon tetrachloride and phenol is catalyzed in the presence of an organic solvent, and the reaction conditions are as follows: the initial pressure of CO2 is 1-6 MPa, the temperature is 100-160 DEG C, and the time is 6-12 hours. After the reaction, standing for layering, directly recycling the DES at the lower layer, rectifying the product phase at the upper layer to remove the organic solvent to obtain diphenyl carbonate, and recycling the organic solvent. The method solves the problems of difficulty in catalyst recovery, many byproducts, low yield and the like in the traditional method, has the advantages of high product purity, recyclability of the catalyst and the solvent and simplicity and convenience in operation, and is suitable for industrial production.

The application provides a preparation method of triphenyl chloromethane and belongs to the technical field of pharmaceutical intermediates. The preparation method comprises the following steps: obtaining a suspension by using pure benzene, a composite catalyst and an adsorbent, then adding carbon tetrachloride drop by drop to obtain a reaction liquid, stirring and treating the reaction liquid with 808 nm laser when the reaction liquid is heated to 60-80 DEG C, and then performing post-treatment to obtain the triphenyl chloromethane. The composite catalyst catalyzes the reaction of pure benzene and carbon tetrachloride to generate triphenyl chloromethane and release hydrogen chloride, and the adsorbent can adsorb hydrogen chloride in situ, thereby preventing acid corrosion and catalyst poisoning while maintaining the forward progress of the reaction. The composite catalyst and the adsorbent realize catalysis-adsorption synergistic promotion of the forward progress of the reaction, thereby reducing the catalyst consumption, shortening the reaction time, reducing the wastewater generation amount, improving the reaction yield and the purity of the triphenyl chloromethane.

The application discloses a green preparation method of 4,4'-difluorobenzophenone. The method uses 4,4'-difluorobenzene as raw material, potassium bromide as catalyst, acetic acid as solvent, and oxygen as oxidant, and 4,4'-difluorobenzophenone is generated in high selectivity through one-step oxidation under mild conditions. The application surprisingly finds that in the presence of potassium bromide, a new non-metallic catalytic oxidation system of potassium bromide / acetic acid / oxygen is used to realize high-efficiency and high-selectivity conversion of the C-H bond at the benzyl position. Compared with the traditional method, the application does not need to use a transition metal catalyst, does not need to use carbon tetrachloride and other materials damaging the ozone layer, and does not need to involve a dangerous intermediate such as a diazonium salt, the process route is short, the atomic economy is high, the product yield is high, the product purity is high, the catalyst is cheap and easy to obtain, and the application has excellent industrial application prospect and green chemistry characteristics.

The invention relates to a continuous production method of carbon tetrachloride, which comprises the following steps: mixing and vaporizing perchlorinated hydrocarbon and chlorine, and carrying out chlorination reaction at the temperature of 200-500 DEG C under the pressure of 0.6-1 MPa to obtain a crude product; performing gas-liquid separation on the crude product, returning the gas to the mixed vaporization step for recycling, and rectifying the liquid to obtain a carbon tetrachloride product; and returning other products obtained by rectification to the mixed vaporization step for recycling. In the production process, the raw materials are perchloro and chlorine, no hydrogen element participates in the production process, the required temperature and pressure conditions are relatively low, the reaction conforms to the concept of green chemistry, and the utilization rate of chlorine atoms in the whole process is 95% or above.

The invention provides an anode carbon block soaked with carbon. An adhesive for the anode carbon block soaked with the carbon comprises the following raw material components in parts by weight: 50-55 parts of coal pitch, 25-30 parts of borax, 10-15 parts of kaolin, 30-35 parts of industrial phosphoric acid, 40-45 parts of carbon tetrachloride and 50-55 parts of water. The preparation method of the soaked carbon anode carbon block comprises the following steps: measuring the surface temperature of an anode cooked block by using an infrared temperature measuring gun, slowly putting the anode cooked block into a soaking pool, keeping for 30-60 seconds, keeping for 25-35 seconds in the air, and then putting the anode cooked block into a drying oven for drying, thereby obtaining the soaked carbon anode carbon block. The service life of the anode carbon block obtained through the preparation method of the soaked carbon anode carbon block is prolonged, the pole changing period of the anode carbon block is increased to 36 days or above from 34 days, the anode carbon consumption is reduced, and the electrolytic bath process is stabilized.

The invention discloses a rapid detection method for carbon tetrachloride in a water-based paraffin remover and inhibitor, the rapid detection method is suitable for rapid detection of the carbon tetrachloride in the paraffin remover and inhibitor, the rapid detection steps comprise sample preparation, reagent preparation, detection stage and result determination, and the method has the advantages of rapidness and high efficiency, and can be used for rapid screening of the carbon tetrachloride in the paraffin remover and inhibitor. The method comprises the following steps: adding a fresh aluminum bromide ethanol solution into a to-be-detected water-based paraffin remover and inhibitor, keeping a water bath at 100 DEG C, and continuously stirring; if white precipitates or flocculent insoluble substances appear in the sample to be detected, it is judged that the sample to be detected contains carbon tetrachloride, and if white precipitates or flocculent insoluble substances do not appear in the sample to be detected, it is judged that the sample to be detected does not contain carbon tetrachloride. According to the method, large instruments and equipment are not needed, and rapid detection of carbon tetrachloride in the water-based paraffin remover and inhibitor can be achieved in a simple and efficient mode.

The present invention belongs to the technical field of lithium-ion battery negative electrode materials, and specifically relates to a nano-silicon-embedded silicon dioxide / carbon composite negative electrode material and its preparation method. The present invention uses hydrophobic nano-silicon dioxide and asphalt as main raw materials. The asphalt is dissolved in carbon tetrachloride, the nano-silicon dioxide and the asphalt solution are mixed, and heat-treated to produce carbon-coated silicon dioxide powder; the carbon-coated silicon dioxide powder is mixed with aluminum powder, potassium chloride, and anhydrous aluminum chloride, and reduced to produce carbon-coated nano-silicon-embedded silicon dioxide powder; the carbon-coated nano-silicon-embedded silicon dioxide is mixed with the carbonized product of the asphalt and ball-milled; the ball-milled product is mixed with asphalt, styrene, and imidazoline, and ball-milled in a carbon tetrachloride medium. The ball-milled product is heat-treated to produce the nano-silicon-embedded silicon dioxide / carbon composite negative electrode material. The method of the present invention is simple, low-cost, environmentally friendly, and easily scalable. Furthermore, the resulting negative electrode material has excellent electrochemical properties.

The invention provides a preparation method of a vanadium polyethylene catalyst, which comprises the following steps: mixing and reacting a mixed solution of iodine, chloralkane and ether with metal magnesium to obtain an organic magnesium solution; the method comprises the following steps: mixing an organic magnesium solution with fatty acid ester for reaction to obtain a mixture, and then mixing the mixture with a chlorination reagent for reaction to obtain a solid magnesium-containing product; preparing a hydrocarbon solution of a solid magnesium-containing product, and mixing the hydrocarbon solution with an aluminum alkyl compound for reaction to obtain a magnesium-containing carrier; finally, adding a hydrocarbon solvent into the magnesium-containing carrier to obtain a magnesium-containing carrier suspension; wherein the chlorination reagent comprises halogenated aromatic hydrocarbon and carbon tetrachloride; and mixing the magnesium-containing carrier suspension and the vanadium-containing solution for reaction to obtain the vanadium polyethylene catalyst. The preparation method can further reduce the content of phenyl-containing compounds in the synthesis process of the vanadium polyethylene catalyst, and further improve the environmental friendliness of a polymerization product; the vanadium polyethylene catalyst prepared by the method is relatively high in vanadium content and has relatively high polymerization activity.

The invention discloses a pentachloropropane synthesis method based on raw materials of vinyl chloride and carbon tetrachloride, and belongs to the technical field of new chemical materials. The method comprises the main steps of raw material proportioning and pretreatment, nano catalytic reaction, product primary extraction and purification and the like. The catalyst is prepared by compounding ferrous chloride and nano iron oxide and then loading on a mesoporous carbon carrier, and has excellent catalytic performance. The product is purified through reduced pressure distillation and an activated carbon adsorption column, and the purity can reach 99.7% or above. The method creatively combines a nanotechnology with specific reaction conditions, and has the advantages of high yield, high product purity, good catalyst stability and the like. Compared with a traditional synthesis method, the method has the advantages that the production efficiency is remarkably improved, the energy consumption is reduced, an innovative and practical technical path is provided for industrial production of pentachloropropane, and the method has a wide application prospect.

This invention discloses a method for preparing 2,3,3,3-tetrafluoropropylene, comprising reacting carbon tetrachloride with ethylene in the presence of a catalyst containing reduced iron powder and a co-catalyst, separating and purifying the reactants to obtain HCC-250fb; subjecting HCC-250fb to dehydrochlorination to generate HCC-1240za; reacting HCC-250fb with chlorine in a liquid-phase or gas-phase chlorination reaction to obtain HCC-240db; reacting HCC-240db with hydrogen fluoride in a gas-phase fluorination reaction to generate HCFO-1233xf; and reacting HCFO-1233xf with hydrogen fluoride in a gas-phase fluorination reaction in the presence of a supported or unsupported chromium oxide catalyst to generate HFO-1234yf. The method of this invention uses readily available raw materials, has low cost, and allows unreacted raw materials to be recycled for further reactions, resulting in minimal waste emissions.