143 results about "Silicon tetrachloride" patented technology

The invention relates to a continuous production method of high-purity tetraethoxysilane, and belongs to the technical field of tetraethoxysilane preparation. The method comprises a raw material pretreatment stage and a purification and rectification stage: in the pretreatment stage, silicon tetrachloride and ethanol are subjected to an esterification reaction in a molar ratio of 1: (3-4) under the protection of nitrogen, the pH is adjusted to be neutral through triethylamine, and triethylamine hydrochloride is removed through reduced pressure distillation; then, a cerium oxide-molecular sieve composite adsorbent with the specific surface area larger than or equal to 800 m / g and the pore diameter of 2-5 nm is adopted for dehydration under the pressure of 0.8-1.2 MPa till the water content is smaller than or equal to 5 ppm, and volatile impurities are removed through high-purity nitrogen purging; in the purification stage, metal ions and Cl are synergistically removed through a titanate modified resin layer and a nano TiOtube layer, and then step-by-step separation is performed through a four-stage differential pressure rectifying tower. Through collaborative optimization of structural design of the composite adsorbent, construction of an organic-inorganic hybrid interface of the resin layer and pressure gradient rectification, 72-hour continuous production is achieved, the single-pass yield of the product is 92%, and the total amount of metal impurities is smaller than or equal to 5 ppb.

The invention belongs to the technical field of silicon carbide coatings, and particularly relates to a method for quickly depositing a silicon carbide coating through CVD (Chemical Vapor Deposition), which comprises the following steps: pretreating a graphite substrate; debugging the equipment; placing the pretreated substrate in a reaction furnace, closing a furnace door, starting a vacuum system, pumping the pressure in the reaction furnace to-Pa, and reducing the interference of air in the furnace on the reaction; introducing a small amount of hydrogen into the reaction furnace, rapidly raising the temperature in the furnace to 800-900 DEG C, maintaining the temperature, then introducing a very small amount of silicon source and carbon source gas, and carrying out preliminary deposition on the surface of the substrate; and hydrogen, silicon tetrachloride and methane are sequentially introduced. The preparation method of the CVD silicon carbide coating can solve the problems of low deposition rate, long preparation period and the like when the existing CVD process is used for preparing the silicon carbide coating, so that the production efficiency can be greatly improved, the cost can be reduced, and the preparation method has important significance in promoting the application of the silicon carbide coating in more fields.

The invention relates to a preparation method of silicon dioxide-boron nitride nanobelt aerogel, which comprises the following steps: dissolving melamine and boric acid in a co-solvent of tert-butyl alcohol and hot deionized water, stirring and mixing, carrying out ultrasonic treatment, freeze-drying and the like to obtain a melamine-boric acid aerogel precursor, placing the precursor in a tubular furnace, and carrying out vacuum drying to obtain the silicon dioxide-boron nitride nanobelt aerogel. Pyrolyzing in an ammonia gas atmosphere to obtain boron nitride nanobelt aerogel; and placing the boron nitride nanobelt aerogel in a xylene solution containing tetraethoxysilane and silicon tetrachloride, taking out the boron nitride nanobelt aerogel, and drying the boron nitride nanobelt aerogel. And hydrolyzing and pyrolyzing in an inert atmosphere to form a silicon dioxide layer on the surface, thereby obtaining the silicon dioxide-boron nitride nanobelt aerogel. The silicon dioxide and boron nitride nanobelt aerogel is low in density and excellent in mechanical property and oxidation resistance.

The electronic-grade silane gas continuous production preparation system comprises a cold hydrogenation treatment device, an inlet of the cold hydrogenation treatment device is connected with a raw material supply system, and an outlet of the cold hydrogenation treatment device is connected with a cold hydrogenation rectifying tower through a pipeline. The cold hydrogenation rectifying tower is sequentially connected with the boron and phosphorus removal adsorption column, the first-stage disproportionator, the first tower, the second tower, the second-stage disproportionator, the third tower and the fourth tower through pipelines, and electronic-grade silane in the fourth tower is used for being conveyed to a silane tank area; the first tower is used for removing silicon tetrachloride produced after the disproportionation reaction of the first-stage disproportionator; the second tower is used for separating the extracted chlorosilane material; the third tower is used for separating silane from chlorosilane; and the fourth tower is used for discharging light impurities and heavy impurities and conveying gas-phase electronic-grade silane into a silane tank area. The device and the method realize continuous, efficient and high-purity production of the electronic-grade silane gas, and have the advantages of low energy consumption, low cost, thorough impurity removal and the like.

The invention provides a photovoltaic glass surface self-cleaning coating and a preparation method thereof.The photovoltaic glass surface self-cleaning coating is prepared from a dehydrated organic solvent, 1-7 parts by mass of tetramethyl orthosilicate, 2-15 parts by mass of fluorosilane hydrophobic coupling agent, 10-20 parts by mass of silicon tetrachloride, 1-10 parts by mass of hydrophobic silane coupling agent, 5-15 parts by mass of dichloro (methyl) (3, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5- and 1-10 parts of 2, 3, 3-trifluoropropyl) silane and 1-10 parts of dimethyl dichlorosilane. According to the preparation method, tetramethyl silicate with relatively low reaction activity is used as a raw material to react with silicon tetrachloride to form an intermediate species with moderate activity, and then a linear chain polymer modification layer is pre-formed on the surface by utilizing the difference of reaction rates; a fluorosilane substance added in the coating also can participate in the reaction to form an organic silicon linear polymer with a fluorosilane side chain; in the recombination process of polysiloxane, perfluoro side chains with lower surface energy migrate to the surface of the coating; meanwhile, by adding the dichlorosilane coupling agent and the trichlorosilane coupling agent, the flexibility and hydrophobicity of the coating are improved.

The invention provides a silicon-carbon negative electrode material and a preparation method and application thereof, and belongs to the technical field of lithium ion battery negative electrode materials. The preparation method comprises the following steps: adding silicon tetrachloride and calcium carbide into a carbon tetrachloride solution, uniformly stirring, and transferring into a high-pressure reaction kettle for reaction to obtain a Si-C precursor; adding the obtained Si-coated C precursor into absolute ethyl alcohol and carrying out ball milling treatment; and carrying out suction filtration and drying on the material obtained by ball milling, calcining and carbonizing in inert gas, and cleaning the obtained product to obtain the silicon-carbon negative electrode material. The silicon-carbon negative electrode material prepared by the invention is used for preparing a negative electrode material of a lithium ion battery, has good cycle performance, has relatively high reversible specific capacity and first coulombic efficiency, and is excellent in overall electrochemical performance.

The invention relates to a method and a system for preparing trichlorosilane from ferrosilicon, the method comprises the following steps: taking ferrosilicon, silicon tetrachloride and hydrogen as raw materials, fully reacting in a fluidized bed reactor to obtain trichlorosilane and FeSiy alloy, xlt; 40). The system comprises a fluidized bed reactor (200), a cyclone separator (300), a washing tower (400), a gas-liquid separator (500) and a coarse distillation tower (600). Compared with the prior art, the method has the remarkable characteristics that the silazite is used as a silicon source and is low in cost and easy to obtain, the reaction activity of trichlorosilane and FeSiy generated by reaction of the silazite, silicon tetrachloride and hydrogen is high, the utilization rate of silicon elements in the compound is high, no extra catalyst needs to be added in the co-hydrogenation reaction, meanwhile, the byproduct FeSiy alloy is produced, and the production cost is low.

The invention discloses a cold hydrogenation quench tower energy recovery system and an operation mode, and the system comprises a quench tower, a vaporizer, a first-stage heat exchange system, a second-stage heat exchange system and a circulating water cooler, and layered energy recovery is realized through a three-stage cascade heat exchange structure: a high-temperature liquid-phase material discharged from a quench tower sequentially passes through a second-stage heat exchange system, a first-stage heat exchange system and a circulating water cooler to complete heat exchange, and meanwhile, a heating heat source is provided for silicon tetrachloride and hydrogen. Through the design of multiphase flow enhanced heat transfer, feed gas quality-divided heat exchange and tail liquid recovery, the system significantly improves the energy recovery rate, reduces steam consumption and raw material loss, enhances the operation stability of the system, and is suitable for efficient and energy-saving production of a cold hydrogenation process.

The application discloses an olefin polymerization catalyst and a preparation method thereof, and the olefin polymerization catalyst is used for preparing a polypropylene thermoplastic elastomer, and the olefin polymerization catalyst contains silicon tetrachloride modified silicon dioxide, a transition metal component and a non-transition metal component; the transition metal component is titanium tetrachloride and / or titanium alkoxy, and the non-transition metal component is a magnesium-containing compound. The olefin polymerization catalyst has high initial activity and overall activity, and polypropylene particles with high porosity are obtained. The catalyst can obtain a polypropylene thermoplastic elastomer with high rubber content in the synthesis process of the polypropylene thermoplastic elastomer.

The invention discloses a chlorosilane raw material purification system and method for reducing donor and acceptor impurities in polycrystalline silicon, and belongs to the technical field of polycrystalline silicon production, the chlorosilane raw material enters a first rectifying tower for primary rectification separation, the tower kettle of the first rectifying tower is extracted and flows into a silicon tetrachloride raw material tank, and the tower top of the first rectifying tower is extracted and flows into a second rectifying tower; tower top produced liquid of the first rectifying tower is subjected to secondary rectifying separation in a second rectifying tower, tower bottom produced liquid of the second rectifying tower flows into a third rectifying tower, and tower top produced liquid of the second rectifying tower flows into a mixer; tower kettle produced liquid of the second rectifying tower is subjected to third-time rectifying separation in a third rectifying tower, and tower top produced liquid of the third rectifying tower flows into a fourth rectifying assembly; the tower top produced liquid of the third rectifying tower is subjected to fourth rectifying separation in a fourth rectifying assembly, tower bottom produced liquid of the fourth rectifying assembly flows into a chlorosilane storage tank, and product liquid is produced from the tower top of the fourth rectifying assembly; and the tower kettle produced liquid of the third rectifying tower is subjected to adsorption and impurity removal in the first adsorber, and flows into a chlorosilane storage tank after impurity removal.

The invention belongs to the technical field of cold hydrogenation synthesis, and particularly relates to a treatment method of slag slurry generated in a cold hydrogenation synthesis process, the slag slurry generated in the cold hydrogenation process is sequentially subjected to primary filtration, secondary diatomite precoating filtration, drying evaporation and rectification purification treatment, so that the recovery rate of chlorosilane (mainly silicon tetrachloride) is up to 99%, and the recovery rate of chlorosilane is up to 99%. Resource waste and environmental pollution are avoided, meanwhile, an alkali washing tank is omitted, the process is simplified, and energy consumption is reduced; in addition, physical separation (filtration, drying and rectification) and solid slag neutralization are adopted in the treatment method, no wastewater is generated, a matched sewage treatment system is not needed, and the environmental protection cost and energy consumption are remarkably reduced.

A system and method for separating aluminum trichloride from cold-hydrogenated silicon tetrachloride includes a pressure-reducing tank, a condenser, a first extraction tank, a second extraction tank, a clear liquid filter, and a clear liquid tank. The system is characterized by: a silicon tetrachloride inlet pipe at the top of the pressure-reducing tank; the bottom of the pressure-reducing tank being connected to the first and second extraction tanks via pipes; the bottoms of the first and second extraction tanks being connected to a dryer via pipes; the side walls of the first and second extraction tanks being connected to the clear liquid filter via pipes; the tops of the first and second extraction tanks being connected to the condenser via pipes; the bottom of the condenser having a liquid outlet pipe connected to the top of the clear liquid tank; and the bottom of the clear liquid tank having a silicon tetrachloride recovery pipe; and the clear liquid filter being connected to the liquid outlet pipe via a pipe. This invention improves the clogging situation of the entire cold hydrogenation system, solves the problem of long-term operation of the cold hydrogenation system, and reduces the equipment failure rate.

The invention discloses a trichlorosilane deep rectification composite impurity removal process, and belongs to the technical field of polycrystalline silicon production raw material purification. According to the process, deep purification of crude trichlorosilane is achieved through the steps of pre-protection and primary adsorption, directional rectification enrichment of methyl dichlorosilane narrow fractions, concentration, mixing with silicon tetrachloride, catalytic reaction rectification conversion, differential pressure thermal coupling rectification purification, double-tank parallel deep purification, tail gas treatment and the like. According to the method, the impurity methyl dichlorosilane difficult to remove is precisely separated through side extraction, the impurity methyl dichlorosilane is converted into a component easy to separate through a catalytic reaction, and the boron and phosphorus impurities are deeply removed in combination with differential pressure thermal coupling energy saving and double-tank alternate adsorption. The process can efficiently remove moisture, metals and key impurities boron and phosphorus, obviously improves the purity of the trichlorosilane product, realizes gradient utilization of energy and hydrogen circulation, and has the advantages of high purity, low energy consumption and continuous production.

This invention provides an activation method for a liquid fatty amine, a preparation process for the liquid fatty amine and silane, wherein the liquid fatty amine has a tertiary amine group; the activation method involves activating the liquid fatty amine with silicon tetrachloride; this method can significantly improve the catalytic effect of the liquid fatty amine, and the activated liquid fatty amine exhibits higher catalytic activity in the process of disproportionation of trichlorosilane to prepare silane, which can effectively reduce the reaction activation energy, increase the reaction rate, and improve the single-pass reaction efficiency and conversion rate.

The application provides a method for preparing chlorosilane by catalytic cracking of polychlorosiloxane, which comprises the following steps: adding high-boiling material, a chlorine source, a catalyst and a reducing agent into a reactor to generate silicon tetrachloride through a catalytic cracking reaction; the high-boiling material comprises at least one of polychlorosilane and polychlorosiloxane; the catalyst is a supported catalyst, the carrier material of the catalyst is a porous material, and the active component of the catalyst comprises at least one of copper, nickel, zinc and rare earth elements. The method can effectively open Si-Si bonds and Si-O bonds, and realize the cracking of high-boiling materials such as polychlorosilane and polychlorosiloxane generated in the production process of polysilicon, especially the cracking of oxygen-containing polychlorosilane. Under the joint action of the reducing agent, the catalyst and the silicon-based additive, the conversion rate of polychlorosiloxane is higher, and the energy consumption of the reaction can be effectively reduced.

The invention relates to a method for recovering silicon in the form of silicon tetrachloride, in which biochar having a silicon content of at least 1% by weight, expressed as% by weight of elemental silicon, is reacted with elemental chlorine at a temperature of 350 to 900 DEG C and the formed silicon tetrachloride is separated from the exhaust gas stream, preferably by condensation.

The invention discloses an environment-friendly chlorine-free polysilicate synthesis process. The process comprises the following steps: by taking silicon powder, alcohol and a silicate synthesis catalyst as raw materials, directly reacting at 120-180 DEG C to generate a silicate intermediate, and carrying out combustion treatment on byproduct hydrogen; and hydrolyzing the obtained intermediate at 40-80 DEG C under the catalysis of a chlorine-free immobilized hydrolysis catalyst, and carrying out condensation and activated carbon adsorption refining to obtain a polysilicate product. A traditional silicon tetrachloride route is thoroughly abandoned, introduction of chlorine elements is avoided from the source, no hydrogen chloride is generated in the reaction process, and environmental pollution and equipment requirements are greatly reduced; the method has the advantages of simple process, stable raw material source and high atom economy, can realize cyclic utilization of silicon powder and alcohol, and can flexibly produce polysilicate esters of different brands by regulating and controlling process conditions. The process has the advantages of cleanness, safety, low cost, high product purity and the like, and is particularly suitable for high-end fields with strict requirements on chlorine content.

The invention provides a method and a system for recovering chlorosilane in polycrystalline silicon process waste gas. The method for recovering the chlorosilane in the polycrystalline silicon process waste gas comprises the following steps: absorbing the process waste gas by using a silicon tetrachloride solution to obtain a chlorosilane mixed solution and intermediate waste gas; and adsorbing the intermediate waste gas by using an adsorbent to obtain lean gas and an adsorbent to be regenerated. According to the method for recovering chlorosilane in the polycrystalline silicon process waste gas, chlorosilane in the process waste gas can be recycled with lower energy consumption and cost, and the method has excellent economic benefits.

The invention provides a process for purifying and refining industrial grade titanium tetrachloride, which comprises the following steps of: removing main impurities such as silicon tetrachloride, vanadium oxychloride, aluminum chloride, ferric chloride and titanium oxychloride in a titanium tetrachloride crude product by adopting a rectification method and a chemical method, and condensing into a titanium tetrachloride liquid; carrying out degassing treatment on the titanium tetrachloride liquid; filtering the titanium tetrachloride liquid by using an ultrafiltration membrane; filtering the titanium tetrachloride liquid by using a nanofiltration membrane; and crystallizing the titanium tetrachloride liquid to obtain a finished product of which the purity reaches 99.99% and the total content of metal impurities is less than 5ppb. Main impurities in a titanium tetrachloride crude product are removed through a rectification method and a chemical method, then titanium tetrachloride liquid is filtered through an ultrafiltration membrane and a nanofiltration membrane, and metal impurities are efficiently removed through surface negative charges of the nanofiltration membrane, so that a titanium tetrachloride finished product with the purity reaching 99.99% and the total content of the metal impurities being smaller than 5 ppb is obtained. The process steps are simplified, and the titanium tetrachloride purification efficiency is improved.

The present invention discloses a method for selecting silicon powder particles suitable for a cold hydrogenated fluidized bed. The key points of the technical solution are to assume that the potential energy of the silicon powder in the bed is offset by the kinetic energy of the gas phase material, calculate the gas flow rate μ of the gas phase on the surface of the silicon powder in the fluidized bed; select the mesh size of the silicon powder particles according to the real-time rising gas flow rate, and maintain the bulk density in the fluidized bed at 200-2500 kg / m 3 The mesh ratio of all silicon powder particles fed into the fluidized bed is calculated. The present invention provides a method for selecting silicon powder particles suitable for a cold hydrogenated fluidized bed based on the amount of silicon tetrachloride vaporized and the rising gas velocity within the fluidized bed. The method is simple to calculate and easy to operate, making it suitable for use in cold hydrogenated fluidized bed production operations. It reduces the amount of metallic silicon powder particles carried out of the fluidized bed, prevents damage to the distributor, and achieves a high conversion rate.

The application relates to the technical field of battery material and resource recycling, and provides a process for preparing lithium-sulfur electrolyte raw materials based on waste salt, which comprises the following steps: taking industrial waste salt as a sulfur source, taking lithium-rich waste residue as a lithium source, taking waste carbon as a reducing agent, uniformly mixing the three with a binder, granulating, further calcining to obtain a mixture, mixing the obtained mixture with a solvent A, ball milling, solid-liquid separation, obtaining a liquid phase containing sulfides, subjecting the obtained solid phase to acid immersion treatment and condensation to obtain silicon tetrachloride, mixing and dissolving the liquid phase containing sulfides and lithium chloride, carrying out solid-liquid separation to obtain a solution containing lithium chloride and lithium sulfide, reducing and concentrating the solution containing lithium chloride and lithium sulfide to obtain a mixed product of lithium chloride and lithium sulfide, and further adjusting the proportion to obtain lithium-sulfur electrolyte raw materials. The application realizes the resource utilization of industrial waste salt and lithium-rich waste residue, reduces the preparation cost of lithium-sulfur electrolyte raw materials, simultaneously produces high-value silicon tetrachloride as a byproduct, and reduces waste emission.

The invention belongs to the field of battery materials, and provides battery-grade lithium difluoro (oxalato) borate as well as a preparation method and application thereof.The battery-grade lithium difluoro (oxalato) borate is prepared by mixing lithium fluoride, ethyl acetate and boron trifluoride gas for a first reaction to obtain a first reaction solution containing lithium tetrafluoroborate, mixing the first reaction solution with oxalic acid and silicon tetrachloride for a second reaction to obtain a second reaction solution containing lithium tetrafluoroborate; a second reaction solution containing a lithium difluoro (oxalato) borate component is obtained; the lithium difluoro (oxalato) borate is subjected to vacuum rectification and then mixed with dichloromethane for crystallization, a lithium difluoro (oxalato) borate crude product is obtained, the crude product is washed with a dichloromethane and ethyl acetate mixed washing agent and dried, and a battery-grade finished product is obtained. According to the method, gas boron trifluoride is used for reacting in a gas-liquid system, specific ethyl acetate is used as a solvent, specific dichloromethane is adopted for devitrification, a mixed washing agent of dichloromethane and ethyl acetate is used for washing a crude product, and various improved procedures are matched, so that the reaction is more sufficient, impurities are effectively removed, and the yield is increased.

The invention belongs to the technical field of preparation of lithium battery negative electrode materials, and relates to a silicon-containing carbon material, preparation thereof and application of the silicon-containing carbon material in the lithium battery negative electrode materials, the silicon-containing carbon material contains carbon and silicon, the silicon is distributed in the carbon material, and the silicon-containing carbon material is provided with pore channels and / or holes. The preparation method comprises the following steps: reacting an aromatic hydrocarbon-containing raw material in the presence of silicon tetrachloride, pre-oxidizing and carbonizing. The silicon-silicon-carbon material is used as a lithium battery negative electrode material, and is relatively high in capacity and relatively good in stability.

The utility model discloses a dedusting and purifying silicon tetrachloride flow controller which comprises a fixing seat, a control box is arranged on the upper portion of the fixing seat, a main control board is arranged in the control box, an air channel is arranged in the fixing seat, an air outlet is formed in one side of the air channel, and a dust collecting device is arranged on the air outlet. A connecting pipe is arranged on the other side of the air channel, and a filtering mechanism is arranged on the side face of the connecting pipe. The power mechanism comprises the two sets of driving wheels, the driving wheels are arranged between the two sets of driving wheels, one set of driving wheels is connected with the driving shaft, the other set of driving wheels is rotationally connected with the filtering mechanism, the connecting shaft of the other set of driving wheels extends to the outer portion of the power mechanism and is connected with the driving motor, and the driving shaft is driven by the power mechanism to rotate. The circulating filter screen rotates to filter floating dust in silicon tetrachloride gas, blockage of the filter screen can be effectively reduced through circulating filtration, a plurality of groups of adsorption plates are arranged in the filtering mechanism to effectively adsorb the floating dust, and cleanliness of silicon tetrachloride is improved.

This invention discloses a process for the cold hydrogenation of silicon tetrachloride to produce trichlorosilane. Silicon tetrachloride and hydrogen are fed into a bubbling slurry bed reactor for catalytic cold hydrogenation. The bubbling slurry bed reactor uses molten salt as a medium and metal chloride as a catalyst, operating at a temperature of 450–500°C and a reaction pressure of 2.5–4.0 MPaG. This invention features a simple process, meets the requirements for large-scale and continuous production, and boasts low investment, low operating costs, and high safety and reliability. The silicon tetrachloride conversion rate and process flow are simple, and the reactor investment is significantly lower than existing cold hydrogenation reactors, solving the problems of high equipment investment and low reaction conversion rates in existing cold hydrogenation processes.

The application relates to the technical field of silicon tetrachloride processing, and discloses a purification device for high-purity silicon tetrachloride processing, which comprises a base, a heating frame is inserted into the top of the base, the inner wall of the heating frame is fixedly connected with a processing frame, the surface of the processing frame is fixedly connected with a heating device, the bottom of the base is fixedly connected with a support, the inner wall top of the support is fixedly connected with a hydraulic rod, the bottom of the hydraulic rod is fixedly connected with the top of the heating frame, and the inner wall of the support is fixedly connected with an air pump. After the silicon tetrachloride raw material is placed in the inside of the processing frame, the heating device is started to work, the heat generated by the heating device is transmitted to the inside of the processing frame through the processing frame to heat and treat the silicon tetrachloride raw material, the water vapor generated after the silicon tetrachloride raw material is heated floats upwards, the air pump is started to work, the suction force generated by the air pump enters the inside of the processing frame through the circular pipe and sucks the water vapor into the inside of the elbow pipe, and the water vapor flows in the inside of the elbow pipe.

The invention belongs to the technical field of functional food, and particularly relates to plant silicon water capable of improving atherosclerosis and a preparation method of the plant silicon water. The method comprises the following steps: S1, mixing silicon tetrachloride, high-purity oxygen and hydrogen to obtain mixed gas; s2, introducing the mixed gas into a radio frequency induction plasma torch to generate silicon-containing gas; s3, the silicon-containing gas is subjected to temperature programming, purging and deacidification under nitrogen carrier flow, and a silicon gas-phase product is obtained; and S4, performing feedback control. The radio frequency induction plasma torch is adopted for high-temperature pyrolysis, and it is ensured that silicon tetrachloride is completely decomposed to generate high-activity silicon-containing gas. The sodium citrate solution is used for dissolution and synchronous surface modification, and the strong coordination capability of citrate radicals is used for stabilizing silicon hydroxyl, so that the product is endowed with stable electronegativity. And in combination with a feedback regulation mechanism of online component and potential monitoring, accurate control of key quality attributes of a final product is realized, and the product consistency is ensured.

This utility model discloses a system for removing impurities from carbon-containing chlorosilanes and recovering chlorosilanes, comprising: a first distillation column for receiving and concentrating carbon-containing chlorosilanes; a first adsorption and reaction device connected to the first distillation column, the first adsorption and reaction device being filled with a metal adsorbent material and equipped with a silicon tetrachloride feed pipeline; a second adsorption and reaction device connected to the first adsorption and reaction device, the second adsorption and reaction device being filled with a methyldichlorosilane adsorbent material; a second distillation column connected to the second adsorption and reaction device; and a third distillation column connected to the second distillation column. This utility model can adsorb and concentrate metal impurities in carbon-containing chlorosilanes as a catalyst for the carbon removal reaction, effectively avoiding deactivation and failure caused by metal impurities encapsulating the resin catalyst, improving the conversion rate of methyldichlorosilane, and effectively avoiding the disproportionation reaction of silicon trichloride in the presence of the resin catalyst, thereby improving the carbon removal efficiency and chlorosilane recovery efficiency.

A high-efficiency cold hydrogenation fluidized bed reactor is characterized by comprising a lower head, a cylinder and an upper head; a material inlet is arranged at the bottom of the lower head, and a gas distributor is arranged above the material inlet; a mixture of silicon tetrachloride and hydrogen enters from the material inlet and is uniformly distributed through the gas distributor; a silicon powder inlet, a silicon powder outlet and a plurality of bubble breakers are arranged above the gas distributor. By symmetrically arranging guide vanes, the airflow forms an "eight" symmetrical direction flow in a single grid block and forms a rotating flow between multiple grid blocks; the reverse arrangement of the guide vanes of the upper and lower bubble breakers makes the bubbles form a rotating cutting when passing through the grid block, which can effectively reduce the diameter of the bubbles and prevent the gas from re-agglomerating into bubbles along the vertical direction after breaking; meanwhile, the residence time of the material can be increased, and the turbulent flow degree of the material in the reactor can be increased, so that the flow field in the cold hydrogenation fluidized bed reactor can be improved, and the conversion efficiency of trichlorosilane can be improved.

The application provides a resin catalyst activation device and activation method for silane gas preparation, relates to the technical field of silane gas catalyst activation, and specifically comprises a reactor, a double-path cooling system and a refrigerant circulating system. The reactor is internally provided with heat exchange pipes, and externally provided with a silicon tetrachloride feeding pipe and a nitrogen feeding pipe. The double-path cooling system comprises independently controlled silicon tetrachloride coolers and nitrogen coolers, and is in communication with the silicon tetrachloride feeding pipe and the nitrogen feeding pipe, respectively. The refrigerant circulating system comprises branch refrigerant channels, and is in communication with the silicon tetrachloride coolers, the nitrogen coolers and the heat exchange pipes of the reactor, respectively. The refrigerant circulating system is filled with refrigerant, and the refrigerant is ethylene glycol chilled water. The technical scheme can be used to solve the problems of poor temperature control, long activation period and catalyst deactivation in the existing catalyst activation scheme.