42 results about "Hydrogen phosphide" patented technology

The invention relates to the technical field of grain surface air conditioners, and discloses a grain surface air conditioning system with an air-tight door, which comprises a case and two air ports in the front wall of the case, a shaft tube disc is rotatably connected in the front wall of the case, the left and right sides of the shaft tube disc are respectively provided with a through groove I butted with the air ports, and the upper and lower sides of the shaft tube disc are respectively provided with a through groove II; the front side and the rear side of the second through groove are slidably connected with abutting connection discs, and first sealing rings are arranged on the edges of the opposite sides of the abutting connection discs. The shaft pipe disc and the abutting disc are controlled to act step by step before and after granary fumigation, the first sealing ring is driven to vertically extrude and seal the air opening or vertically reset, the valve cover is matched to extrude the second sealing ring and contract into the two air pipes, and therefore the situation that a sealing piece is abraded and fails is avoided, and the double-air-tight-door function is provided; in addition, dust on the surface of the elastic filter disc can be fully cleaned and collected, the situation that the dust and hydrogen phosphide are combined to form viscous particles to block the elastic filter disc is avoided, and follow-up stable use of the elastic filter disc is guaranteed.

The preparation method comprises the following steps: firstly, dissolving a carbon carrier and a nickel source in deionized water, and uniformly mixing the carbon carrier and the nickel source in an ultrasonic manner to obtain dark green turbid liquid; drying the dark green turbid liquid to obtain a dark green solid; roasting and screening the dark green solid to obtain a precursor with nickel oxide; putting the precursor into a quartz tube, putting the quartz tube into a tubular furnace, introducing hydrogen phosphide gas into the tubular furnace, and phosphating to obtain a NixPy electrocatalyst; the method is low in preparation cost, short in time and simple in process, the problem of yellow phosphorus tail gas emission is effectively solved, and production of green energy is promoted; the electrocatalyst has a good application prospect in the field of hydrogen production through electrocatalytic water decomposition.

The invention belongs to the technical field of granary access control, and particularly relates to an intelligent granary access control system which comprises an environment sensing module, an identity recognition module, a processing control module and an execution and feedback module. The environment sensing module is used for collecting environment parameter data at the entrance of the granary in real time and comprises a phosphine sensor, an oxygen sensor and a carbon dioxide sensor; according to the invention, by fusing the technical characteristics of the hydrogen phosphide sensor, the oxygen sensor and the carbon dioxide sensor, the environmental safety is comprehensively evaluated, and compared with the dependence of a single sensor, the accuracy and reliability of environmental state judgment are remarkably improved, and the occurrence of false alarms and missing alarms is effectively prevented. Due to the fact that a control logic process of'absolute priority of environmental safety 'is adopted, the technical characteristic ensures that personnel safety is put at the first place under any condition, which is a core guarantee of high safety of the system, and the effect of the system is directly reflected as protection of life safety.

The invention discloses red phosphorus master batch as well as a preparation method and application thereof. The red phosphorus master batch comprises the following components in parts by weight: 50-70 parts of a red phosphorus flame retardant; 30 to 50 parts of a toughening agent; 1-4 parts of a stabilizing aid; wherein the stabilizing aid comprises one or more of zinc oxide, calcium oxide, chromic oxide, hydrotalcite, metazirconic acid or magnesium oxide. According to the invention, the toughening agent with a specific content is adopted to coat the red phosphorus flame retardant, and the stabilizing aid is added, so that the content of phosphine in the red phosphorus master batch in the use process can be effectively reduced, and when the red phosphorus master batch is added into the nylon resin, the prepared nylon composite material has relatively low phosphine content and relatively good flame retardant property.

The unattended granary hydrogen phosphide fumigation device comprises a first supporting plate and a second supporting plate, two groups of generating gas tanks are symmetrically arranged between the first supporting plate and the second supporting plate, and heat dissipation assemblies are arranged in the two groups of generating gas tanks and on the surfaces of the two groups of generating gas tanks; the heat dissipation assembly comprises a conveying pipe, the upper end of the conveying pipe is in through connection with a first flow dividing pipe and a second flow dividing pipe, the end, away from the conveying pipe, of the surface of the second flow dividing pipe is in through connection with a heat dissipation plate, and a wavy water guide groove is formed in the heat dissipation plate. Water is conveyed into a second flow dividing pipe, the water entering the second flow dividing pipe flows into a heat dissipation plate, is guided by a wave groove and then flows into a filtering water tank again through a water drainage pipe, and the circulation is carried out, so that rapid heat dissipation of the heat dissipation plate can be realized, heat generated when hydrogen phosphide is generated in the gas generation tank is reduced, and the reaction stability is improved.

The invention discloses a method and system for separating and recycling phosphorus and iron in ferrophosphorus waste residues, and relates to the technical field of solid waste utilization. The method comprises the following steps: crushing the ferrophosphorus waste residue, and heating and melting in an inert environment; the molten ferrophosphorus waste residues are sprayed into a reaction furnace in a blowing mode, the inert atmosphere is kept in the reaction furnace, and meanwhile water is introduced into the reaction furnace; the temperature of the reaction furnace is increased to 400-1000 DEG C, heat preservation is conducted for 10-60 min, the ferrophosphorus waste residues react with water, and hydrogen phosphide gas and iron oxide are obtained; and introducing the obtained phosphine gas into a collection device for collection, and collecting the obtained iron oxide from the bottom of the reaction furnace. The method disclosed by the invention has the advantages of simple process flow, small wastewater generation amount, high phosphorus element recovery rate and high phosphine purity.

The invention discloses a low-precipitation red phosphorus flame-retardant nylon 66 composition and a preparation method thereof. The low-precipitation red phosphorus flame-retardant nylon 66 composition is prepared from 49.6-54.2 parts by weight of polyamide 66 resin, 30 parts by weight of chopped glass fiber, 12-15 parts by weight of red phosphorus flame-retardant master batch, 0.7-3.3 parts by weight of a functional aid, 0.5 part by weight of an antioxidant, 0.6 part by weight of a lubricant and 2 parts by weight of color master batch. According to the invention, the polyamide 66 resin and the chopped glass fiber are used as base materials, the red phosphorus flame-retardant master batch and the functional auxiliary agent are added, and then the materials are fully mixed with the antioxidant and the lubricant, so that the flame-retardant low-precipitation polyamide 66 composite material has excellent flame retardance, good mechanical properties and excellent low-precipitation property; the functional auxiliary agent can reduce the damage of shearing to the coating layer of the red phosphorus master batch, and in the heating process, the functional auxiliary agent reacts with generated substances such as hydrogen phosphide and phosphoric acid, so that the release amount of the hydrogen phosphide is reduced, and the condition that the substances such as phosphoric acid migrate to the surface is reduced.

The invention relates to the technical field of semiconductor material precision machining, in particular to a chemical mechanical polishing solution as well as a preparation method and application thereof. The chemical mechanical polishing solution comprises the following components in percentage by mass: 6-12% of a composite abrasive, 3-7% of a composite oxidant, 2-5% of a complexing agent, 0.5-2% of a phosphine antidote, 0.3-1.5% of a dispersion stabilizer, 0.1-1% of a pH regulator and the balance of water. The composite abrasive is a composite material of aluminum oxide and silicon dioxide; the composite oxidant comprises a sodium hypochlorite solution and a hydrogen peroxide solution. Through reasonable proportioning and synergistic effect of the composite abrasive, the composite oxidant, the complexing agent, the phosphine antidote, the dispersion stabilizer and the pH regulator, the polishing solution is not only suitable for a single substrate, but also compatible with chemical mechanical polishing of three typical third-generation semiconductor materials of indium phosphide, gallium arsenide and germanium, has good universality and process adaptability, and is suitable for industrial production. And the production cost and the process switching complexity can be reduced.

According to the novel technology for photocatalytic decomposition of phosphine and the novel method for preparing the photocatalyst, the novel technology for photocatalytic decomposition of phosphine through a photo-initiated composite photocatalyst is innovatively introduced, the photocatalytic active center in the composite photocatalyst is ferroferric oxide, and the chemical catalytic active center is a chemical nickel-plated layer on the surface of a one-dimensional nano material; the two components synergistically catalyze and decompose hydrogen phosphide; the catalyst is simple in preparation method and low in cost, and the nickel utilization rate is further greatly improved. The technology efficiently catalyzes and decomposes the hydrogen phosphide-containing waste gas to generate elemental phosphorus and hydrogen, and provides an ideal way for recycling phosphorus industrial tail gas.

[Problem] To provide acetylene and acetylene derivatives safely usable as raw materials for various plastics while reducing an environmental load, and to provide a method for efficiently producing the acetylene. [Solution] One aspect of the present invention provides acetylene containing carbon atoms derived from waste, the acetylene containing hydrogen phosphide and / or hydrogen sulfide, the volume fraction of hydrogen phosphide being 0.1% or less, the volume fraction of hydrogen sulfide being 0.2% or less.

The present invention discloses a method for preparing a carbon-coated lithium iron phosphate positive electrode material alternately doped with double heterogeneous atoms, which is to first obtain a sulfur-doped carbon film on the surface of the lithium iron phosphate material by unbalanced magnetron sputtering of a graphite target under an argon and hydrogen sulfide atmosphere; obtain a phosphorus-doped carbon film on the surface of the material under an argon and phosphine atmosphere, and alternately dope the carbon film with sulfur and phosphorus to stabilize the structure of the material, enhance the conductivity of the material, ensure a high doping amount, solve the problem of low intrinsic electronic and ionic conductivity of the lithium iron phosphate positive electrode material, effectively improve the electronic conductivity and ion diffusion rate of the lithium iron phosphate electrode material, and the preparation process does not involve liquid phase and high temperature processes, effectively avoid the introduction of impurities and grain growth, and the experimental process is highly controllable, efficient, and less polluting. After the carbon-coated lithium iron phosphate positive electrode material prepared by the present invention is prepared into a lithium ion half-cell, it shows good rate performance and stability.

The invention provides a calcium carbide process acetylene purification post-treatment method, H2S and PH3 in acetylene gas are treated by sequentially adopting wet catalytic oxidation and an adsorbent adsorption method, an oxidizing agent for wet catalytic oxidation is a mixed solution of ferric sulfate and sulfuric acid, a water-soluble manganese salt and a water-soluble tungstate are also added into the mixed solution, and the water-soluble manganese salt and the water-soluble tungstate are added into the mixed solution. The adsorbent is a cerium-zirconium solid solution loaded with copper oxide. Mn < 2 + > dissociated from manganese salt is introduced into a catalytic oxidation system and forms a bi-component catalytic center with original Fe < 3 + > / Fe < 2 + >, so that the regeneration rate of Fe < 2 + > to Fe < 3 + > can be remarkably accelerated, and the oxidation of the catalyst on hydrogen sulfide and hydrogen phosphide is greatly improved; tungstate is introduced to effectively prevent elemental sulfur from depositing and blocking on the filler and equipment by changing the crystal form of the elemental sulfur, so that the system is guaranteed, PH3 molecules are catalyzed to generate hydrolysis reaction, and phosphorous acid which is easier to oxidize is generated.

The present application relates to the field of potassium hypophosphite production, and particularly relates to a method and system for co-producing potassium hypophosphite and potassium phosphite, which comprises: replacing all the reaction kettles and pipelines with nitrogen to maintain a slight positive pressure in the system; continuously feeding potassium hydroxide aqueous solution and molten yellow phosphorus into the first-stage reaction kettle to generate potassium hypophosphite and phosphine through disproportionation reaction; feeding the reaction liquid into the second-stage reaction kettle to gradually increase the alkali concentration, and convert part of the potassium hypophosphite into potassium phosphite; feeding the reaction liquid into the third-stage reaction kettle to maintain the alkali concentration at a certain level, and convert part of the potassium hypophosphite into potassium phosphite and release hydrogen; feeding the reaction liquid into the fourth-stage reaction kettle to maintain the alkali concentration at a certain level, and continuously discharge the product containing the mixture of potassium phosphite and potassium hypophosphite from the fourth-stage reaction kettle after the reaction approaches equilibrium, thereby improving the production efficiency, reducing the raw material cost, improving the process safety, thermal energy utilization efficiency and product quality, and realizing the comprehensive utilization of the gas byproducts.

The application provides a tail gas purification control method and device, equipment and storage medium for phosphine production, and belongs to the technical field of automatic control. The method comprises the following steps: obtaining running state data of a tail gas purification system at multiple time points in a current period; the running state data comprises inlet gas concentration, outlet gas concentration and inlet-outlet pressure difference; determining the execution sequence of absorption liquid flow regulation, catalyst bed temperature regulation and gas flow rate regulation in the tail gas purification system based on the running state data at the multiple time points, and the regulation direction of the absorption liquid flow regulation, the catalyst bed temperature regulation and the gas flow rate regulation; and performing control regulation of the tail gas purification system based on the execution sequence and the regulation direction. The tail gas purification control method and device, equipment and storage medium provided by the application can improve the tail gas purification effect.

The invention provides a phosphine automatic production method and device based on parallel reaction kettles, and relates to the technical field of phosphine preparation, and the phosphine automatic production method comprises the following steps: obtaining feeding proportions of different materials for producing phosphine and production plans of different reaction kettles; aiming at any reaction kettle, determining the feeding amount of each material in the reaction kettle according to the feeding proportion of different materials and the total feeding amount of the reaction kettle; controlling a feeding assembly to feed the materials into the reaction kettle and controlling a stirring assembly to stir the materials in the reaction kettle according to the feeding amount, feeding control parameters and operation control parameters of the materials in the reaction kettle, so that different materials react to generate hydrogen phosphide; monitoring real-time environment data in the reaction kettle; and according to the real-time environment data, adjusting the feeding control parameters and the operation control parameters to control the reaction of different materials until the reaction of the different materials is completed. According to the invention, the production process of phosphine can be automatically and intelligently controlled, and accurate control of feeding and operation in the reaction kettle is realized.

The utility model provides an acetylene purification device, an acetylene production system and an acetylene carbon black production system, and relates to the technical field of chemical process, acetylene enters a shell through an acetylene gas inlet end and enters purification packing layers again along a distributor, the purification packing layers are arranged in the shell at intervals, and the acetylene carbon black production system is arranged in the shell. Acetylene is purified through the purification filler layer, harmful impurities such as hydrogen phosphide and hydrogen sulfide in the acetylene are purified, reaction and generation of subsequent products are facilitated, and the purified acetylene is conveyed out through the acetylene gas outlet end to enter the next procedure. According to the acetylene carbon black purification device, acetylene is purified by arranging the purification filler layer, and the obtained acetylene carbon black is low in ash content and high in quality when the acetylene carbon black is subsequently prepared from the acetylene.

The utility model discloses a hydrogen phosphide tail gas treatment device. According to the technical scheme, the aluminum phosphide residual material recycling device comprises an air compression mechanism, a vacuum material suction mechanism, an aluminum phosphide residual material generation device, a fan circulation device and a control center. The air compression mechanism comprises an air compressor and a high-pressure air supply pipe connected with the air compressor; the vacuum material suction mechanism comprises a first vacuum material conveyor and a second vacuum material conveyor which are arranged in parallel, the aluminum phosphide residual material generation device comprises a first-stage reaction tank and a second-stage reaction tank which are connected in series, and the fan circulation device comprises a circulation fan communicated with the second-stage reaction tank; and the circulating fan is communicated with a circulating air duct system of a grain pile through a positive pressure end air inlet pipe and a return pipe. The scheme provided by the utility model is used for treating residual powder after deliquescence of aluminum phosphide for further thorough reaction, and poison gas after reaction is sent back to a grain pile for effective utilization.

The utility model discloses an intelligent granary big data management device, which comprises a comprehensive management module, a detection module and a working module, the detection module and the working module are in signal connection with the comprehensive management module, and the detection module comprises a temperature and humidity sensor, a harmful gas sensor and an oxygen concentration sensor which are arranged in a granary. A detection module is arranged to feed back environment conditions in a plurality of granaries in real time, and according to comparison with a preset value, a corresponding working module is started in an automatic control mode of a comprehensive management module or a manual control mode to carry out granary internal environment treatment, and a fumigation bin is arranged on one side of a fumigation rod. When insect killing operation needs to be carried out, aluminum phosphide tablets are put into the fumigation bin, hydrogen phosphide gas generated by decomposition of the aluminum phosphide tablets fully flows among grains, the insect killing effect is improved, the content of hydrogen phosphide in the granary can be detected through the hydrogen phosphide sensor, and workers can enter the granary after confirming safety conveniently in combination with the oxygen concentration sensor.

The utility model discloses an aluminum phosphide deliquescence rate detection device, and relates to the technical field of aluminum phosphide deliquescence rate detection, the aluminum phosphide deliquescence rate detection device comprises a machine body, the bottom end in the machine body is provided with a heating cavity, the rear side of the machine body is fixedly provided with a purification assembly, and the purification assembly is used for absorbing hydrogen phosphide gas generated by aluminum phosphide and purifying the hydrogen phosphide gas; a detection assembly is arranged in the machine body and used for detecting the deliquescence rate of aluminum phosphide, and the purification assembly comprises a box body. According to the hydrogen phosphide purification device, hydrogen phosphide gas remaining in the gas outlet cavity is conveyed to the bottom end of the interior of the purification box through the exhaust pipe, the hydrogen phosphide gas is absorbed by sodium hypochlorite to generate stable and harmless phosphates, the risk of the hydrogen phosphide gas is reduced, and the use safety is improved.

The utility model discloses a continuous reaction device for tetrakis hydroxymethyl phosphonium sulfate. The continuous reaction device comprises a reaction kettle, an injection pump, a gas-liquid mixing pipeline and a circulating liquid outlet pipeline, a feeding hole of the reaction kettle is respectively connected with a formaldehyde feeding pipe, a sulfuric acid solution feeding pipe and a discharging hole of the injection pump; a gas phase inlet of the injection pump is connected with a first phosphine inlet pipe; one end of the gas-liquid mixing pipeline and one end of the circulating liquid outlet pipeline are respectively connected with a discharge hole of the reaction kettle, and the other end of the gas-liquid mixing pipeline and the other end of the circulating liquid outlet pipeline are respectively connected with a liquid phase inlet of the injection pump. Due to the design of the gas-liquid mixing pipeline and the circulating discharging pipe, on one hand, the contact time of gas and liquid phases is prolonged, the absorption amount and the absorption rate of the liquid phases to hydrogen phosphide gas are improved, and therefore the production efficiency of tetrakis hydroxymethyl phosphonium sulfate is improved; on the other hand, on the premise that the production efficiency and quality of tetrakis hydroxymethyl phosphonium sulfate are guaranteed, continuous feeding and continuous discharging are achieved, the purpose of continuous production is achieved, and practicability is high.

The utility model discloses a space circulation medicine supplementing device for a Suzhou-style granary, which relates to the technical field of grain fumigation and comprises a phosphine generator, an air inlet pipe, a four-way pipe, a fresh air pipe, a two-way fan, a main pipe, a first hose and a phosphine gas detector, a display panel of the phosphine gas detector is fixed outside the granary, and a detection probe is arranged in the granary. According to the space circulation medicine supplementing device for the Suzhou-style granary, through the phosphine generator, the gas inlet pipe, the four-way pipe, the fresh air pipe, the two-way fan, the main pipe, the first hose and the phosphine gas detector, a worker can be prevented from making contact with phosphine, and phosphine gas can circularly flow through a grain pile; according to the device, hydrogen phosphide gas can be uniformly and fully permeated into each corner of a grain pile, in addition, the hydrogen phosphide gas in the grain pile can be brought out through air circulation, and the safety of workers is guaranteed.

The invention provides a co-extrusion packaging material with a long-acting slow-release insecticidal function as well as a preparation method and application of the co-extrusion packaging material, and belongs to the technical field of insecticidal functional materials. The invention discloses a co-extrusion packaging material with a long-acting slow-release insecticidal function. The co-extrusion packaging material is composed of an outer surface layer, an insecticide composite layer and a controlled-release layer in sequence from outside to inside, the insecticide composite layer is composed of a resin matrix and aluminum phosphide particles, and the aluminum phosphide particles account for 5-30 wt% of the insecticide composite layer. The outer surface layer has high barrier property, can prevent hydrogen phosphide from dissipating too early, and prevents external water vapor from entering; the controlled release layer can regulate the release rate of hydrogen phosphide through a pore structure, and hydrogen phosphide is slowly released when being in contact with storage articles; according to the insecticide composite layer, microcapsules are wrapped by polymer melt, aluminum phosphide is prevented from making direct contact with the environment, completely-wrapped particles and partially-exposed particles of aluminum phosphide coexist, and the effect of continuously releasing insecticidal gas is achieved.

The utility model belongs to the technical field of aluminum phosphide crushing, and particularly relates to a high-safety aluminum phosphide reaction solid block crushing device which comprises an outer box body, a feeding hopper is arranged at the top of the outer box body, two movable plates are rotatably connected to the top of an inner cavity of the outer box body through torsional springs, two crushing rollers are arranged in the inner cavity of the outer box body, and the two movable plates are arranged on the outer box body. The bottom of the outer box body is movably connected with a movable box, and the two sides of the movable box are provided with a first winding bin and a second winding bin correspondingly. The space between the inner cavity of the outer box body and the feeding hopper can be shielded through the two movable plates, the sealing performance in the crushing process is guaranteed, the protective layer automatically covers the top of the movable box, the situation that crushed aluminum phosphide solid blocks in the movable box make contact with the external environment and workers can be avoided, and the working efficiency is improved. The safety in the crushing process is improved, meanwhile, toxic hydrogen phosphide can be converted into relatively harmless substances through a sodium hydroxide solution in the fixing groove, and the crushing safety is further improved.

This invention relates to the field of precision machining technology for semiconductor materials, and in particular to a chemical mechanical polishing (CMP) slurry, its preparation method, and its application. The CMP slurry comprises the following components by mass percentage: 6-12% composite abrasive, 3-7% composite oxidant, 2-5% complexing agent, 0.5-2% phosphine detoxifier, 0.3-1.5% dispersant stabilizer, 0.1-1% pH adjuster, and water as the balance. The composite abrasive is a composite material of alumina and silicon dioxide. The composite oxidant includes sodium hypochlorite solution and hydrogen peroxide solution. This invention, through the rational proportioning and synergistic effect of the composite abrasive, composite oxidant, complexing agent, phosphine detoxifier, dispersant stabilizer, and pH adjuster, is not only suitable for single substrates but also compatible with the CMP polishing of three typical third-generation semiconductor materials: indium phosphide, gallium arsenide, and germanium. It exhibits good versatility and process adaptability, helping to reduce production costs and process changeover complexity.

The invention discloses a preparation method of a fibrous catalyst for simultaneous purification of hydrogen sulfide and phosphine. The prepared fibrous catalyst is composed of a carbon fiber carrier and a surface metal active component. The fibrous catalyst for synchronous removal of hydrogen sulfide and phosphine is prepared through an electrostatic spinning process, a hydrogen peroxide curing process, a metal salt ultrasonic impregnation process and a roasting process. The fibrous catalyst prepared by the method has rich internal pore structures and high-dispersity surface active components, has strong adsorption and catalysis capabilities, realizes synchronous deep removal of H2S and PH3, and also prolongs the service life of the catalyst. The preparation process is simple, and industrial production is easy to realize.

The invention provides a tail gas purification control method and device for hydrogen phosphide production, equipment and a storage medium, and belongs to the technical field of automatic control. The method comprises the steps that running state data of a tail gas purification system at multiple time points in the current time period are obtained; the operation state data comprises inlet gas concentration, outlet gas concentration and inlet and outlet pressure difference; determining an execution sequence of absorption liquid flow adjustment, catalyst bed temperature adjustment and gas flow rate adjustment in the tail gas purification system and respective adjustment directions of the absorption liquid flow adjustment, the catalyst bed temperature adjustment and the gas flow rate adjustment based on the operation state data at the plurality of time points; and controlling and adjusting the tail gas purification system based on the execution sequence and the adjusting direction. According to the tail gas purification control method and device for hydrogen phosphide production, the equipment and the storage medium, the tail gas purification effect can be improved.

The invention belongs to the field of carbon materials, and discloses a preparation method of phosphorus-doped porous carbon. The preparation method comprises the following steps: mixing biomass pyrolytic carbon, PC13 and water; and putting the mixture into an acid-corrosion-resistant rotary reaction furnace, introducing inert gas, then carrying out segmented heating treatment, finally raising the temperature to sublimate the generated chloride to be discharged along with the inert gas, and cooling the furnace body to obtain the phosphorus-doped high-purity porous carbon, the sectional heating treatment is three-section heating treatment: firstly raising the temperature to 40-80 DEG C for first-section heat preservation, then raising the temperature to 180-320 DEG C for second-section heat preservation, and finally raising the temperature to 500-600 DEG C for third-section heat preservation. According to the preparation method of the phosphorus-doped high-purity porous carbon, phosphorous acid and hydrochloric acid are formed through special reaction of PCl3 and water, phosphoric acid and hydrogen phosphide are generated through disproportionation reaction of phosphorous acid, and finally preparation, phosphorus doping and purification treatment of the porous carbon are achieved through decomposition of hydrogen phosphide.

The preparation device comprises a reaction kettle, a kettle cover is arranged at the upper end of the reaction kettle, a driving part is arranged on the kettle cover, a stirring structure extending into the reaction kettle is arranged at the output end of the driving part, an injection opening I for injecting triethyl phosphate is formed in the upper end of the kettle cover, and a rotating part fixed with the driving part is arranged in the kettle cover; a plurality of exchange grooves are formed in the rotating part, interlayers slide in the exchange grooves, and the upper ends and the lower ends of the interlayers are respectively supported by triethyl phosphite and gas in the reaction kettle to keep balance. Compared with the prior art, the device has the advantages that the interlayer is driven to displace through pressure change caused by toxic gas generated in the reaction kettle, the feeding amount of triethyl phosphite is dynamically changed, and when the reaction kettle reacts violently and the gas pressure is increased, the feeding amount is automatically reduced, the hydrogen phosphide generation rate is reduced from the source, and the yield of hydrogen phosphide is increased. The gas quantity is always within the treatment capacity range of the purification system, and the leakage risk of highly toxic gas is avoided.

The application discloses a preparation method of modified superfine sodium hypophosphite and belongs to the technical field of sodium hypophosphite preparation. The preparation method of the modified superfine sodium hypophosphite comprises the following steps: step (1), mixing quicklime and water to prepare lime milk, then adding a sodium hydroxide solution into a reaction kettle containing the lime milk, uniformly mixing and obtaining a mixed solution; step (2), heating the mixed solution while introducing nitrogen, adding yellow phosphorus into the reaction kettle, heating and reacting to obtain a reaction solution, collecting generated gas through a pipeline during the reaction process, and treating the gas; and step (3), adding a modified surfactant into the reaction solution, stirring and mixing, filtering, removing calcium, adjusting pH, concentrating, crystallizing, centrifuging, drying and obtaining the modified superfine sodium hypophosphite. The prepared sodium hypophosphite has small and uniform particle size, and the content of phosphine gas in the preparation process is low.

The utility model relates to mixed waste gas treatment equipment and a semiconductor process system. The mixed waste gas treatment equipment comprises a first mixed waste gas filtering part, a second mixed waste gas filtering part and a recycling part, the device has the advantages that the upstream semiconductor process equipment is communicated with the first mixed waste gas filtering part and the second mixed waste gas filtering part, and the communication sequence of the first mixed waste gas filtering part and the second mixed waste gas filtering part can be randomly ranked according to actual requirements; therefore, impurities such as hydrogen chloride, trichlorosilane, hydrogen phosphide and diborane in the semiconductor epitaxial gas can be removed, hydrogen is obtained, and the semiconductor epitaxial gas can be recycled and purified to meet emission requirements.