90 results about "Silicon tetrachloride" patented technology

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 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 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 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 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 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 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.

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.

The embodiment of the invention provides a cold hydrogenation production process and device, and the process comprises the steps: introducing a mixed material of hydrogen, silicon tetrachloride and silicon powder into a fluidized bed reactor, carrying out hydrogenation reaction, generating chlorosilane mixed gas, introducing the chlorosilane mixed gas into a coiled tube heat exchanger, carrying out first-stage cooling, and carrying out second-stage cooling; removing silicon powder from the chlorosilane mixed gas output from the coiled tube heat exchanger through a filter unit, introducing the chlorosilane mixed gas output from the filter unit into a heat exchanger for secondary cooling, quenching and washing the chlorosilane mixed gas output from the heat exchanger, and condensing and separating the quenched and washed chlorosilane mixed gas to obtain the chlorosilane gas. The chlorosilane and the hydrogen are obtained. By adopting the coiled tube heat exchanger and immediately filtering after cooling, the problems that a traditional tubular heat exchanger is easy to block and low in heat transfer efficiency are effectively solved, the heat energy recovery efficiency is improved, the system energy consumption is reduced, and the equipment operation cycle is prolonged.

A device and method for efficient clean utilization of fluor carbon cerium ore double chlorination method, relate to the field of rare earth comprehensive utilization and recovery, the device is composed of a first continuous packing bed, pipeline device; second continuous packing bed; third continuous packing bed; first screw propelling type condenser; second screw propelling type condenser. Rare earth concentrate is chlorinated with aluminum chloride, carbon monoxide and chlorine gas generated in the first and second continuous packing beds in the third continuous packing bed. Chlorinated rare earth, aluminum fluoride and alkaline earth metal chlorides generated by chlorination reaction remain in the chlorination slag in solid form, and titanium tetrachloride, silicon tetrachloride and iron chloride leave the chlorination furnace in gaseous form. The gaseous chlorination products are condensed and recovered by the screw propelling type condenser. The solid phase products are separated by water immersion to obtain single rare earth chloride. The present application realizes the comprehensive utilization of rare earth elements and associated elements such as titanium, fluorine, silicon and iron in fluor carbon cerium ore, and no acid and alkali waste liquid and wastewater are generated in the reaction process, which has good environmental benefits.

The invention relates to the technical field of industrial control, in particular to a temperature prediction method and device for a cold hydrogenation fluidized bed reactor, a medium and a product. The method comprises the following steps: acquiring real-time multi-dimensional production data including circulating hydrogen flow, silicon tetrachloride flow, gas velocity of a fluidized bed reactor and the like of the polycrystalline silicon cold hydrogenation fluidized bed, and inputting the real-time multi-dimensional production data into a trained temperature prediction model to obtain a reaction temperature prediction value output by the temperature prediction model; therefore, the polycrystalline silicon cold hydrogenation fluidized bed is optimally controlled through the reaction temperature predicted value, so that the temperature prediction accuracy and reliability of the cold hydrogenation fluidized bed reactor are improved, and the production efficiency of polycrystalline silicon is improved.

This invention provides a modified glass powder, its preparation method, photovoltaic silver paste, and solar cells. The preparation method of the modified glass powder includes the following steps: S1: Mixing a first solvent, a polymeric monomer, a structure control agent, and an initiator to react and obtain polymer chains; then adding silicon tetrachloride to the reaction solution to end-cap the polymer chains, obtaining a first solution containing functionalized polymer chains; wherein the polymeric monomer includes one or more of styrene monomers, conjugated diene monomers, and vinyl monomers; S2: Mixing a second solvent, silica-containing glass powder, and the first solution to cause the functionalized polymer chains to be branched onto the surface of the glass powder, obtaining modified glass powder. The modified glass powder prepared by this method has better compatibility with the carrier in photovoltaic silver paste, and can reduce the agglomeration of glass powder, resulting in better dispersibility and storage properties.

The invention discloses a method for synthesizing silica sol by adopting a loop reactor and a method for synthesizing silicon dioxide. The vacuum suction feeding mode of the Venturi jet mixer in the loop reactor is adopted, and the system has the advantages that no return gas exists, the blockage and corrosion phenomena caused by return gas of the raw material silicon tetrachloride and the by-product hydrogen chloride are avoided, and the system can stably run for a long time. Compared with the problem of product agglomeration caused by violent reaction, mass transfer and untimely mixing of silicon tetrachloride liquid-phase hydrolysis in a traditional tank reactor, high-speed water flow shears sucked gaseous silicon tetrachloride into fine bubbles and forms turbulent flow, the gas-liquid mixing effect is enhanced, the water amount at the two-phase mixing position is always excessive, and the reaction time is shortened. The problem that the concentration of local silicic acid is too high to cause polycondensation to generate agglomerates is avoided, and homogeneous silica sol can be obtained. The yield of silicon dioxide is greater than 93% and is far greater than the yield in a traditional tank reactor.

The invention belongs to the technical field of quartz glass preparation, and discloses a quartz glass CVD synthesis method based on secondary heating and a CVD deposition furnace, the synthesis method comprises the following steps: step 1, hearth preheating; step 2, preheating the raw materials: evaporating the rectified silicon tetrachloride liquid into a gaseous state, then controlling the flow rate through a mass flow meter, conveying the gaseous silicon tetrachloride liquid to a box type heater from a connecting pipeline, and carrying out secondary heating to 300-400 DEG C; step 3, deposition reaction: when the temperature in the deposition furnace reaches 1500-1700 DEG C, introducing the silicon tetrachloride subjected to secondary heating into a combustor, reacting with oxyhydrogen flame which is burning on a deposition target surface, starting deposition at the moment, rotating a lifting device to drive the deposition target surface to descend, setting the initial flow of the silicon tetrachloride to be 70-80g / min, and then increasing the initial flow to 120-130g / min; and step 4, ending deposition. The secondary heating temperature of silicon tetrachloride is set to 300-400 DEG C, so that the reacted product can reach a molten state more quickly and form a glassy state more quickly, the forming period is shortened, and the synthesis efficiency is improved.

The invention provides a gas phase method white carbon black tail gas absorption system and method with an online monitoring and adjusting function. The method comprises the following steps: S1, collecting gas phase method white carbon black tail gas and detecting initial parameters; s2, tail gas pretreatment; s3, primary absorption; s4, secondary absorption; s5, integrating data of the online monitoring system and setting a threshold value; s6, automatic adjustment and control based on monitoring data; s7, discharging tail gas reaching the standard; and S8, collecting and treating by-products. Aiming at the tail gas containing pollutants such as hydrogen chloride, silicon tetrachloride and silicon dioxide dust generated in the production process of the white carbon black by the gas phase method, a whole-process closed-loop treatment system of collection, pretreatment, two-stage absorption, online regulation and control, up-to-standard emission and byproduct recovery is constructed; and accurate removal of tail gas pollutants and efficient recovery of resources are realized.

The invention provides a preparation method of a mixed nitride composite material special-shaped antenna window, which belongs to the technical field of composite materials, and comprises the steps of mixed weaving, washing, pretreatment, vapor deposition, dipping curing, cracking, rough machining, finish machining and finished product obtaining. The pretreatment comprises the following steps: mixing silicon tetrachloride with absolute ethyl alcohol, stirring, adding triton X-100 and trimethyl borate, and uniformly stirring to obtain a pretreatment solution; immersing the washed antenna window prefabricated part into the pretreatment liquid, placing the washed antenna window prefabricated part into a supercritical reaction kettle, introducing carbon dioxide, heating to 38-42 DEG C, controlling the pressure to 9-12MPa, stirring for 1.5-2.5 hours, taking out, standing and drying, and keeping the temperature at 570-590 DEG C for 1.8-2.5 hours and keeping the temperature at 880-910 DEG C for 2.7-3.2 hours in an air atmosphere to obtain an initial antenna window; the prepared antenna window is high in strength, excellent in high temperature resistance and good in ablation resistance.

The utility model belongs to the field of storage tanks, and particularly relates to a silicon tetrachloride purification storage tank which comprises a support, the right end of the support is fixedly connected with a connecting shaft, the outer side of the connecting shaft is rotatably connected with a tank body through a bearing, the bottom of the tank body is fixedly connected with a feed opening, and the top of the tank body is fixedly connected with a cover plate. The upper end of the cover plate is fixedly connected with a feeding port, and the top of the cover plate is fixedly connected with a driving motor. Through the design of the heating sheet, silicon tetrachloride can be heated, silicon tetrachloride gas can be formed and can be conveniently discharged, in the heating process, the driving motor can drive the stirring rod to rotate to stir materials so as to improve the heating efficiency, and meanwhile, under the action of the rotating motor, the rotating motor can drive the top block to rotate, so that the heating efficiency is improved. The convex block can be extruded by rotation of the top block, front-back shaking of the tank body can be achieved, and the stirring and heating effects can be further improved by cooperation with stirring of the stirring rod.

The invention discloses a polycrystalline silicon tail gas recovery system and method based on graded absorption and membrane separation coupling. The system comprises a pretreatment unit, a first absorption tower, a second absorption tower, a membrane separation and purification unit, an analysis and regeneration unit and a light component membrane removal unit. The pretreatment unit performs condensation, compression and gas-liquid separation on the reduction tail gas. The first absorption tower adopts high-purity silicon tetrachloride to remove hydrogen chloride; and the second absorption tower adopts an absorbent rich in trichlorosilane to deeply purify hydrogen. And refining the purified hydrogen through a membrane separator to obtain the electronic-grade high-purity hydrogen. Hydrogen chloride is desorbed from rich liquor from the two absorption towers in the desorption tower; and feeding the light-component-rich liquid extracted from the refluxing tank of the desorption tower into a pervaporation membrane assembly, selectively removing light components such as dichlorosilane and the like, and returning to the system. A traditional adsorption tower is omitted, the cryogenic energy consumption is reduced through graded absorption, and the industrial problem of light component circulation accumulation is solved while the high purity of hydrogen and hydrogen chloride products is guaranteed.

The invention discloses low-hydroxyl defect-free quartz glass and a preparation method thereof.The preparation method comprises the steps that silicon tetrachloride is subjected to flame hydrolysis in oxyhydrogen flame, and a porous silicon dioxide base material is obtained; carrying out vacuum dehydration heat treatment on the porous silicon dioxide base material, heating to 1400-1500 DEG C, carrying out transparent vitrification treatment, and then carrying out thermal forming and annealing treatment to obtain a quartz glass body; and carrying out heat treatment on the obtained quartz glass body in a hydrogen-containing atmosphere at the air pressure of 0.1-1.0 Mpa and the temperature of 520-680 DEG C for 150-500 hours to obtain the low-hydroxyl defect-free quartz glass. Aiming at the problem of oxygen deficiency of quartz glass prepared by a soot method, the invention develops a hydrogen-loaded heat treatment method, so that the oxygen deficiency of the quartz glass is eliminated, and the hydroxyl content is less than 20 ppm.

The application discloses a method for preparing super-hydrophobic silica aerogel by using industrial waste chlorosilane azeotrope. The method comprises the following steps: providing industrial waste chlorosilane azeotrope, the main components of which include trimethylchlorosilane and silicon tetrachloride; adding the industrial waste chlorosilane azeotrope into a mixture of water and non-alcohol organic solvent to react, obtaining silica sol, and heating the silica sol to obtain silica wet gel through polycondensation reaction; and after solvent replacement and drying, obtaining super-hydrophobic silica aerogel, the hydrophobic angle of which is 150-160 degrees. The raw material of the super-hydrophobic silica aerogel is industrial waste, the process is simple, the cost is low, and the super-hydrophobic silica aerogel is conducive to large-scale industrial production. The super-hydrophobic silica aerogel not only solves the environmental protection problem of industrial waste chlorosilane azeotrope, but also obtains high-value silica aerogel, and has great application prospect in the fields of heat insulation, adsorption, environmental protection and catalysis.