14 results about "White Phosphorus" patented technology

The invention discloses a low-energy-consumption electrosynthesis method of phosphotriester compounds, and belongs to the technical field of electrolysis processes for producing compounds. In the electrolysis process, the catalyst loses electrons on the surface of the anode, an oxidation-state catalyst with oxidability is formed, and then the oxidation-state catalyst flows into the reaction device along with oxidation-state catalytic liquid. The oxidation-state catalyst reacts with white phosphorus to oxidize the white phosphorus and reduce the white phosphorus into a normal-state catalyst, and the oxidation-state white phosphorus has good reactivity and can further react with a monohydric hydroxyl compound to form a target phosphotriester compound. According to the method, the catalytic liquid is used as a medium participating in circular reaction, the synthesis route overcomes production interruption caused by reaction and product separation of white phosphorus and the unitary hydroxyl compound in an electrolytic tank under the action of current in an existing electrolytic synthesis system, and the method has the advantages of being simple, efficient, green, environmentally friendly and capable of achieving full-continuous flow production; the method is suitable for industrial production and has a good application prospect.

The application discloses a method for producing phosphorus pentafluoride by electrolysis. The method is to use white phosphorus and anhydrous hydrogen fluoride as raw materials, fluorometal salt or quaternary ammonium fluoride salt as conductive agent, and to carry out electrolysis reaction in a high-nickel anode electrolysis container to produce phosphorus pentafluoride. The preparation method can produce high-purity phosphorus pentafluoride in one step, and the impurities are few when used for synthesizing lithium hexafluorophosphate, and no additional hydrogen chloride gas is produced, the post-processing cost is lower, and the production process is safer and more efficient. In addition, the electrolysis reaction condition is mild, the by-product waste is less, the environmental pollution is small, and the phosphorus pentafluoride gas with a purity greater than 99.99% can be obtained.

The invention provides a triazaaryl phosphine-sulfur compound and a preparation method thereof.The triazaaryl phosphine-sulfur compound shown in the formula (I) is an organic phosphine compound of a triazaaryl phosphine-sulfur structure directly synthesized through white phosphorus, and the process avoids the problems that chlorine with great pollution is used in traditional phosphorus chemical industry production and subsequent emission is caused; and the method is a more environment-friendly production method. In addition, the method disclosed by the invention is simple in step, mild in reaction condition and simple in post-treatment, and the yield of medium or above can be obtained.

The invention discloses a phosphorus recovery system and method for MBE equipment. The phosphorus recovery system comprises a phosphorus recovery cavity, a cooling adsorption unit and a heating conversion unit, one end of the phosphorus recovery cavity is connected to the MBE cavity through a pipeline with a first control valve, and the other end of the phosphorus recovery cavity is connected to the vacuum pump through a pipeline with a second control valve, so that phosphorus-containing gas in the MBE cavity enters the phosphorus recovery cavity; the cooling adsorption unit is arranged at the upper part of the inner side of the phosphorus recovery cavity and is used for cooling and adsorbing phosphorus-containing gas in the phosphorus recovery cavity; the heating conversion unit is arranged at the bottom of the phosphorus recovery cavity and used for converting white phosphorus adsorbed and collected by the cooling adsorption unit into red phosphorus. The device has the advantages of being compact in structure, convenient to operate, high in reliability and the like, the risk of phosphorus spontaneous combustion is greatly reduced, safety accidents are avoided, the whole phosphorus recovery system does not need to be disassembled and assembled independently for professional treatment, normal epitaxial growth of the MBE system is not affected, and manpower and material resources are relatively saved.

This invention discloses a method for removing white phosphorus from soil. First, contaminated soil is mixed evenly with water, stirred, and then nitric acid solution is added. After stirring, a phosphorus removal agent is added, and stirring continues. The mixture is then filtered, freeze-dried, and the phosphorus removal agent is removed using a magnetic sieve to obtain treated soil. The phosphorus removal agent contains nano-ferric oxide, allowing it to separate from the soil via magnetic attraction after treating the white phosphorus, reducing the difficulty of separation and enabling reuse. The soil is treated with nitric acid, causing the white phosphorus to react with the nitric acid to produce phosphate ions. The addition of the phosphorus removal agent releases lanthanum carbonate from the surface. Lanthanum has strong Lewis acidity and can form strong ligands with phosphate, which has Lewis basicity, to adsorb phosphate ions from the soil, thus forming a complex. Simultaneously, the free amino groups on the chitosan surface can adsorb metals, further completing the adsorption of the complex.

This invention relates to the field of etching technology, and in particular to an etching solution and etching method. The etching solution of this invention comprises, by mass percentage: 5wt%–18wt% nitric acid, 2wt%–6wt% glacial acetic acid, 2wt%–5wt% white phosphorus, and 2wt%–8wt% iron oxide. The etching solution of this invention exhibits excellent etching ability and stability, improves the etching morphology, and reduces etching film thickness deviation. Using the etching solution of this invention to etch steel plates to obtain pad printing steel plates improves the flatness, smoothness, brightness, and gloss of the surface of the concave-plate printing images, ensures the matching degree of film thickness for large and small images, thereby increasing the service life of the pad printing and saving pad printing costs.

Provided is a method for preparing a cyclic phosphate compound represented by formula (III) or formula (IV) and a derivative thereof. The method includes: step 1), adding a compound of formula (I), a compound of formula (II), and a solvent to a reactor, and then adding white phosphorus and a first base in sequence, followed by heating while stirring to obtain a mixed solution of reactants; and step 2), adding a second base to the mixed solution of reactants, and subjecting a resulting mixture to heating and reaction; at end of the reaction, stopping the heating and then cooling a resulting reaction product to room temperature; and adding an acid to the reactor and conducting acidification to obtain a compound of formula (III) or a compound of formula (IV).

The invention discloses a high-temperature oxidation-reduction monazite smelting integrated comprehensive recovery technology, which comprises the following steps: pressing monazite and carbon powder with proper particle size into balls, performing three-section temperature control reduction, namely an inert atmosphere preheating section, an oxygen-enriched atmosphere high-temperature main reduction section and an oxygen-enriched air oxidation section, and washing tail gas to prepare phosphoric acid for recovery. And after ball crushing and acid dissolution, respectively treating filter residues, removing iron from the solution, extracting uranium, precipitating thorium and concentrating according to the temperature of a high-temperature main reduction section in an oxygen-enriched atmosphere. The recovery rate of rare earth elements such as yttrium and radioactive element uranium in the technology is high, the potential safety hazard problem of white phosphorus is solved, waste liquid is little, and radioactive waste residues are greatly reduced.

The invention relates to the technical field of battery negative electrode materials, in particular to a phosphorus-carbon negative electrode material production device and a preparation method, and the preparation method comprises the following operation steps: placing activated carbon in a closed container, and then carrying out vacuum heat treatment on the closed container; injecting molten white phosphorus into the closed container in proportion, and mechanically stirring and uniformly mixing; heating the closed container and continuously stirring; the temperature in the closed container is adjusted to the conversion temperature, and heat preservation is conducted; cooling the closed container, injecting alkali liquor into the closed container after cooling, heating for alkali washing, discharging waste gas generated during alkali washing out of the closed container, and further treating the waste gas; and washing, drying and packaging. By adopting the specific device, the problem that white phosphorus and activated carbon are difficult to compound is solved, the phosphorus-carbon negative electrode material is prepared by taking cheap white phosphorus as a phosphorus source, the production cost of the phosphorus-carbon negative electrode material is remarkably reduced, and the preparation method is safe, efficient and easy to operate and does not influence the deposition efficiency of phosphorus.

The invention provides a phosphorus-carbon negative electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing porous carbon and an amine solution of red phosphorus for dipping to obtain mixed slurry, and carrying out solid-liquid separation to obtain filtrate and filter residues; drying the filter residue to obtain a solid; and adding the solid into the filtrate, and repeatedly carrying out mixed impregnation, solid-liquid separation and drying until the filtrate is used up to obtain the phosphorus-carbon negative electrode material. According to the preparation method, a liquid phase deposition method is adopted, the deposition amount of red phosphorus particles in the pore structure of the porous carbon matrix is increased, meanwhile, the risk of producing white phosphorus can be effectively reduced, the safety performance of the phosphorus-carbon negative electrode material is improved, and large-scale production is facilitated.

This invention relates to a method for producing high-purity red phosphorus, comprising: placing high-purity white phosphorus in an inner high-purity quartz tube; after the high-purity white phosphorus cools and solidifies, inserting the inner high-purity quartz tube into an outer high-purity quartz tube; installing a stainless steel pipe joint at the opening of the outer high-purity quartz tube; inserting the sealed outer high-purity quartz tube into an infrared electric heater; inserting the infrared electric heater into a stainless steel sealed pressure vessel and installing a cap; sealing the stainless steel sealed pressure vessel; preheating and liquefying the high-purity white phosphorus under nitrogen protection and atmospheric pressure until all moisture in the high-purity white phosphorus evaporates; pressurizing the outer high-purity quartz tube and maintaining internal and external pressure balance, raising the temperature to 350℃-380℃; and when the temperature drops below 250℃, forcibly cooling and discharging the material from the stainless steel sealed pressure vessel. This invention employs nested inner and outer high-purity quartz tubes, with the material discharging from the inner high-purity quartz tube for easy removal of the red phosphorus; and filling both the inner and outer sides of the outer high-purity quartz tube with nitrogen to maintain pressure balance and ensure safety.

The application provides a trialkyloxyphosphine compound derivative shown in formula (I) and a preparation method thereof. The trialkyloxyphosphine compound derivative is an organic phosphorus compound with a structure similar to that of trialkyloxyphosphine, which is directly synthesized by using white phosphorus. The process method avoids the use of highly polluting chlorine gas and subsequent emission problems in traditional phosphorus chemical production, and is a more environmentally friendly production method. In addition, the method disclosed by the application has simple steps, mild reaction conditions, simple post-treatment, and can obtain a yield of more than medium.

The invention discloses an FJH-based monazite smelting integrated comprehensive recovery technology which is characterized in that pressed balls of monazite powder and reducing carbon powder are subjected to flash evaporation Joule heating, and crystal structures such as indissolvable xenotime and the like in monazite are effectively destroyed through FJH high-temperature instantaneous reduction cracking, so that the purity of the monazite is improved, and the purity of the monazite is improved. The leaching activity of heavy rare earth elements such as yttrium (Y) and uranium (U) wrapped in acid-insoluble slag is improved, then low-temperature (oxygen-enriched) air is introduced to oxidize phosphorus, tail gas is washed with water to recover phosphoric acid, the pressed balls after reaction are crushed, acid dissolution is performed, radioactive substances are separated, and then concentration is performed. According to the technology, the recovery rate of rare earth elements such as yttrium and radioactive element uranium is high, the potential safety hazard of white phosphorus is solved, the leaching activity of heavy rare earth elements such as yttrium and uranium wrapped in the acid-insoluble slag is remarkably improved, the rare earth recovery rate is high, the radioactive element recovery rate is high, the phosphorus recovery rate is high, phosphorus harm is avoided, a small amount of waste liquid is generated, and the method is accurate, controllable and low in energy consumption.

The invention provides a preparation method of a tri (aryl ethynyl) phosphine compound, and the tri (aryl ethynyl) phosphine compound is a tri (aryl ethynyl) phosphine compound which is shown in a formula (II) and contains a triaryl ethynyl structural unit. The tri (aryl ethynyl) phosphine compound is directly synthesized from white phosphorus and an aryl acetylene compound under the action of alkali, an activating agent and an assistant, and the process avoids the problems of use of chlorine with great pollution and subsequent emission in the traditional phosphorus chemical production, and is a more environment-friendly production method. In addition, the method disclosed by the invention is mild in reaction condition, relatively short in reaction time and simple in post-treatment, and relatively high yield can be obtained.