14 results about "Carbon Chloride" patented technology

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 application discloses a preparation method and application of a catalyst for cracking 1,2-dichloroethane to produce vinyl chloride, and comprises the following steps: 1) a neodymium ore is leached with hydrochloric acid, and after filtering a leaching solution, potassium chloride is added to form a doped precursor K2[NdCl3]; 2) an active metal oxide is dissolved in hydrochloric acid, and then added into the doped precursor K2[NdCl3] solution, and co-precipitation is carried out by adding alkali to obtain an emulsion of a doped active component; the active metal oxide is at least one of oxides of vanadium, manganese, titanium and scandium; 3) the emulsion of the doped active component is mixed with a liquid carrier to obtain the catalyst; the liquid carrier is one or more of chloroform, carbon tetrachloride, 1,1,2-trichloroethane and chlorobenzene.

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 invention belongs to the technical field of conversion process monitoring, and provides an on-line monitoring method for conversion of hydrochloric acid from carbon tetrachloride, which comprises the following steps: acquiring historical data of a conversion process in a steady state and operation under various preset abnormal working conditions, and constructing time sequence data including trichloromethane concentration and process parameters and a corresponding state label historical data set; performing statistical feature extraction on the historical data set, and establishing a correlation model between the statistical features of the trichloromethane concentration and the process parameter state based on a machine learning algorithm; the method comprises the following steps: detecting the concentration of trichloromethane in a reactor outlet product in real time through an online analysis instrument, calculating the real-time statistical characteristic of the real-time trichloromethane concentration as the input of a correlation model, and comparing the output process parameter monitoring combination with the currently activated process parameters to generate a control instruction. By monitoring a key reaction intermediate (trichloromethane), the number of monitored process parameters is optimized, and the preposition of abnormal early warning can also be realized.

A kind of urban sludge-containing sewage comprehensive treatment method and treatment system, solve the problems of low-cost high-efficiency sludge dewatering and sewage treatment, the treatment method is: sludge-containing sewage is stirred, mixed, precipitated with carbon tetrachloride liquid in displacement reaction tank, and forms water layer and carbon tetrachloride liquid and sludge mixed layer, overflowed water, carbon tetrachloride and sludge vaporization separation to remove organic water and dry sludge, carbon tetrachloride recycling is used.The treatment system scheme is: the system includes: displacement dewatering and organic matter processing part consisting of displacement reaction tank, water treatment part consisting of water intermediate tank and adsorption tower and displacement agent condensing tower consisting of displacement agent recovery part and heating station part.The beneficial effects of the present application are: simple process, safe and reliable, the treatment efficiency is increased by more than 10 times, the cost is reduced by 85%, the moisture content of sludge displacement dewatering is less than 5%, sludge displacement dewatering and sewage organic matter inactivation treatment are completed at the same time.

The invention discloses a device for accurately controlling feeding of trace gas-phase carbon tetrachloride. The device comprises a constant-flux pump, a micro-channel evaporator, a constant-temperature unit and a CCl4 storage tank, the CCl4 storage tank is connected with the constant-flux pump through a pipeline, the constant-flux pump is connected with the micro-channel evaporator through a pipeline, and the constant-temperature unit is connected with the micro-channel evaporator through a pipeline to form a loop. Comprising the following steps: S1, setting the temperature of a constant temperature unit to be 90-120 DEG C, and starting the constant temperature unit; s2, the first valve and the third valve are in a closed state, and the second valve is in an open state; s3, setting the temperature of the first heating belt, the second heating belt, the third heating belt and the fourth heating belt to be 90-120 DEG C, and turning on a power supply of the heating belts; s4, the liquid level height of the CCl4 storage tank is checked and recorded; s5, when the actual temperature of the constant-temperature unit and the heating belt reaches the set temperature value, the flow of the constant-flux pump is set to be 0-20 mL / h, and the constant-flux pump and a third valve are opened; and S6, the constant-flux pump, the first heating belt and the second heating belt are sequentially closed, and the second valve is closed.

This invention discloses a method and system for determining volatile halogenated hydrocarbons in dissolved gases of seawater, belonging to the field of analytical chemistry. The method employs direct gas injection combined with a six-way valve switching injection system, enabling the direct and simultaneous determination of seven volatile halogenated hydrocarbons in seawater: chloroform, carbon tetrachloride, trichloroethylene, bromodichloromethane, tetrachloroethylene, dibromochloromethane, and tribromomethane. This eliminates the need for organic solvents and complex pretreatment, filling a technological gap in this field. Validation shows a detection limit of 0.1–1.1 nmol / mol, a retention time RSD ≤ 0.20%, a concentration RSD ≤ 4.93%, and a relative error between -2.01% and 1.56%. The method exhibits advantages such as high sensitivity, good stability, simple operation, and environmental friendliness, and can be directly applied to fields such as marine environmental monitoring and seabed oil and gas resource exploration.

The application discloses lattice copper and carbon vacancy co-modified zero-valent iron and a preparation method and application thereof in catalyzing dechlorination of carbon tetrachloride in water, and belongs to the technical field of functional catalysts and underground water pollution remediation. The application solves the technical problem of slow and incomplete dechlorination caused by inherent electron competition between carbon tetrachloride and water. Based on an in-situ sacrifice strategy of the iron oxide layer, the application utilizes consumption of the surface iron oxide layer, oxygen volatilization and carbon reduction in a high-temperature ball milling process to induce formation of carbon vacancies, promote lattice doping of copper in the core of the zero-valent iron, promote outward release of iron and inward migration of copper (lattice doping), and prepare the lattice copper and carbon vacancy co-modified zero-valent iron catalyst with a symbiotic structure. The catalyst can realize rapid and complete dechlorination of carbon tetrachloride, the product is a chlorine-free product (methane, carbon monoxide and formic acid), the product recovery rate is greater than 80%, and the dechlorination reaction can occur in a wide pH environment.

The invention discloses an iron powder water purifying agent and a preparation method thereof, and the iron powder water purifying agent comprises the following components in parts by weight: 2.7 to 3.5 parts of dodecyl acrylate, 9.8 to 11.0 parts of dibenzoyl peroxide, and 0.23 to 0.35 part of hydrophobic association cationic PDMC flocculant. According to the iron powder water purifying agent and the preparation method thereof disclosed by the invention, the water purifying agent prepared by the method can repeatedly remove impurities entrained in sewage, can realize rapid sedimentation of the impurities and oil stains in the water, and can be separated from the impurities to form a relatively large flocculating constituent, so that rapid sedimentation can be realized; compared with the prior art, the device has the advantages that the treatment efficiency of pollutants difficult to degrade can be effectively improved, separated impurities can be conveniently recycled, the impurities cannot be damaged, the saturated oil absorption rate of carbon pentachloride is high, and the device can be used under severe conditions.

This invention belongs to the field of organic synthesis technology, specifically relating to a method for preparing 1,1,3,3,3-pentafluoropropylene. This invention designs a perovskite-type catalyst doped with noble metals or synergistically constructs a supported metal catalyst. Through a collaborative mechanism where the support provides strong Lewis acidity and fluorination activity, while the noble metal provides dehydrogenation activity, the interfacial interactions and reaction matching of the catalytic system are precisely controlled. This allows for highly efficient catalysis of the integrated "telomerization-fluorination-dehydrogenation" reaction of vinyl chloride (CHCl=CH2), carbon tetrachloride (CCl4), and hydrogen fluoride (HF). The reaction can be carried out continuously in the same reactor and with the same synergistic catalyst system, without the need to change equipment or catalysts, resulting in outstanding production efficiency. Furthermore, the selectivity and controllability of the reaction conditions are significantly optimized, enabling high-selectivity and high-yield synthesis of the target product under mild conditions. Simultaneously, it achieves the resource utilization of industrial waste carbon tetrachloride, representing a major technological breakthrough in terms of raw material cost, process simplification, and environmental friendliness.

The invention discloses a preparation method of dichloromolybdenum dioxide. The preparation method comprises the following steps: mixing molybdenum trioxide, carbon tetrachloride and a solvent; and in an inert atmosphere, heating to 180-240 DEG C for reaction to obtain the dichloro molybdenum dioxide. According to the preparation method, the reaction temperature is low, the reaction conditions are easy to control, the reaction selectivity is high, the purity of the obtained target product molybdenum dioxide is high, and the purity gt of the molybdenum dioxide is high; 99% of molybdenum metal ions gt; the purity is 99.9999%.

The application belongs to the technical field of organic synthesis and relates to a method for preparing diphenyl carbonate. The method uses a deep eutectic solvent (DES) as a catalyst to catalyze the one-pot reaction of CO2, carbon tetrachloride and phenol 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 h. After the reaction, the layers are separated by standing, the lower layer DES can be directly recycled, the upper layer product phase is subjected to rectification to remove the organic solvent to obtain diphenyl carbonate, and the organic solvent can be recycled. The application solves the problems of difficult recovery of the catalyst, many by-products and low yield in the traditional method, has the advantages of high product purity, recyclable catalyst and solvent and simple operation, and is suitable for industrial production.

The invention relates to a method for preparing a metal rhenium coating by taking carbon tetrachloride as a chlorine source, which comprises the following steps: S1, under the conditions of 5-50kPa and 700-900 DEG C, introducing mixed gas of carbon tetrachloride and argon into raw material rhenium powder, and reacting to obtain rhenium pentachloride; and S2, the rhenium pentachloride obtained in the step S1 reacts under the conditions that the pressure is 5-50 kPa and the temperature is 1000-1300 DEG C, the rhenium pentachloride is deposited on a workpiece, the temperature is reduced to the room temperature, and the metal rhenium coating is obtained. The metal rhenium coating is good in compactness.

The application provides a preparation method of 5N cesium iodide and belongs to the technical field of inorganic material preparation. A cesium carbonate solution is purified to remove insoluble substances, and then cations such as calcium and magnesium are removed by using a cation exchange resin to obtain a purified cesium carbonate solution; the purified cesium carbonate solution is evaporated and concentrated, cooled and crystallized, and dried to obtain dry cesium carbonate; elemental iodine is added into water, carbon tetrachloride is added, and the carbon tetrachloride solution containing the elemental iodine is distilled to obtain refined elemental iodine; the dry cesium carbonate, the refined elemental iodine and hydrazine hydrate are mixed to obtain a cesium iodide solution, which is evaporated and concentrated, cooled and crystallized, and dried to obtain 5N cesium iodide. The application selects a low-cost and high-yield method to purify raw materials from the perspective of raw materials, and 5N cesium iodide is prepared, so that multiple recrystallizations are avoided, and the method has the characteristics of low cost and high yield.