82results about "Phosphorus preparation" patented technology

The utility model relates to the technical field of high-purity phosphorus product preparation and collection, and discloses a product collection device for preparing high-purity phosphorus through bromine reduction, which comprises a fixing plate, a fixing frame fixedly mounted at the top of the fixing plate, a reaction barrel arranged inside the fixing frame, a feeding pipe and a gas outlet pipe arranged outside the reaction barrel, a mounting top frame is fixedly mounted at the top of the reaction barrel, reaction mixing mechanisms are arranged at the top of the mounting top frame and inside the reaction barrel, auxiliary collecting mechanisms are arranged inside the fixing frame and outside the reaction barrel, and a waste gas treatment tower is arranged on the side, away from the reaction barrel, of the gas outlet pipe. The reaction mixing mechanism is arranged, corresponding gears in a selectable gear set are meshed with first gears, the mixture attached to the inner wall of the reaction barrel can be scraped while the mixture is stirred, and the auxiliary collecting mechanism is arranged, so that in the using process, a material partition plate can be dynamically opened, and products are better discharged and collected.

The present invention provides a method for preparing high-stability two-dimensional black phosphorus. First, a phosphorus source and an iodine source are introduced into a reaction system for preliminary preheating and activation. After being fully activated in the raw material area of ​​the reaction system, they are slowly transferred to the crystal growth area of ​​the reaction system. The phosphorus source and the transport agent flow through the liquid to the catalyst and are fully converted in the intermediate formation area. The converted intermediate slowly moves to the crystal nucleation growth area to begin crystal nucleation and growth. After further sufficient reaction, the crystal nucleation growth point continues to extend and grow, and finally the black phosphorus crystal slowly nucleates and grows in blocks. After the crystal growth is completely cooled to room temperature, the unconverted raw materials are reused until they are finally converted into black phosphorus crystals and tail gas. The tail gas is absorbed and converted into other by-products. The use of high-temperature and high-pressure resistant pipelines can achieve efficient transportation of gaseous phosphorus, thereby extending the growth time of black phosphorus crystals and improving the growth efficiency of black phosphorus crystals.

The invention discloses a regeneration and activation method of an inactivated black phosphorus catalyst, and belongs to the technical field of phosphorus chemical new materials. The method comprises the following steps: placing an inactivated black phosphorus catalyst in a high-temperature area of a separator, separating an inert substance on the surface of the inactivated catalyst from the catalyst by controlling a separation temperature gradient in the separator under a vacuum or inert atmosphere sealing condition, then taking out the catalyst, and mixing the catalyst with iodine or an iodine compound, under the sealing condition of vacuum or inert atmosphere, reacting at 400-550 DEG C for 20-120 minutes, and cooling to 200-350 DEG C within 60-120 minutes, so as to realize the activation of the deactivated catalyst; and the activated catalyst has good reaction activity and very high cycle stability.

The invention belongs to the technical field of battery negative electrode materials, and particularly relates to a black phosphorus carbon negative electrode, a synthesis method and synthesis equipment thereof and a battery comprising the black phosphorus carbon negative electrode. The black phosphorus carbon negative electrode comprises porous carbon, black phosphorus loaded in the porous carbon and coating carbon for coating the porous carbon, the black phosphorus is deposited into the porous carbon after gas-phase phosphorus except the black phosphorus is subjected to catalytic conversion, and the mass ratio of the black phosphorus is 10%-80%. Cheap phosphorus materials such as red phosphorus are used as raw materials, gas-phase black phosphorus is formed through gasification and catalysis and is deposited into porous carbon under the action of temperature difference, then the outermost layer is coated with a layer of coating carbon to obtain the black phosphorus carbon negative electrode, the performance of the negative electrode material is improved, and the cost advantage is obvious.

The invention discloses a phosphorus-carbon composite negative electrode material as well as a preparation method and application thereof, and belongs to the technical field of sodium-ion battery negative electrode materials. Aluminum powder, melamine, conductive carbon black and P2O5 which are cheap and easy to obtain are used as raw materials, the phosphorus-carbon composite negative electrode material composed of phosphorus nanoparticles and a nanometer wrinkled carbon layer wrapping the phosphorus nanoparticles is prepared through in-situ reaction ball milling and acid pickling processes, and the phosphorus-carbon composite negative electrode material has excellent rate capability, high specific discharge capacity, first-week coulombic efficiency and cycling stability and can be applied to the field of lithium ion batteries. The preparation method is simple, efficient, low in cost and easy to realize industrial production.

The invention provides a preparation method of a Cu-Bp / escherichia coli (Cu-BP / E. coli) semi-artificial photosynthetic system for efficient biological hydrogen production. The preparation method comprises the following steps: designing black phosphorus nanosheets doped with copper quantum dots, testing the catalytic performance of Cu-Bp, and testing the hydrogen production performance of the Cu-BP / E. coli semi-artificial photosynthetic system. The system combines Escherichia coli capable of effectively catalyzing hydrogen generation and excellent light absorption performance of inorganic materials, and energy in sunlight is converted into chemical energy. Under the irradiation of visible light with the wavelength range of 420-780 nm and the light intensity of 2000 Wm, the system shows excellent hydrogen production performance, the hydrogen production amount within 5 hours reaches up to 2.12 mmol, and the hydrogen production amount is 2.07 times that of a BP / E. coli system and 2.32 times that of pure escherichia coli. A new path is opened up for the development of the field of biological hydrogen production.

A phosphorus-carbon composite material includes: phosphorus atoms; and carbon atoms, in which a content ratio of the phosphorus atoms in the phosphorus-carbon composite material is 10 mass % or more and 95 mass % or less, a content ratio of the carbon atoms in the phosphorus-carbon composite material is 5 mass % or more and 90 mass % or less, and a ratio WL620 / WL780 of a weight loss ratio WL620 at a measurement temperature of 620° C. and a weight loss ratio WL780 at a measurement temperature of 780° C., which are obtained by thermogravimetric measurement under the following conditions, is 0.1 or more and 0.9 or less. (Thermogravimetric measurement) 10 mg of the phosphorus-carbon composite material is accurately weighed to prepare a sample, and using a thermogravimetric measuring device, a weight change when the sample is heated from 50° C. to 780° C. at a temperature rising rate of 10° C. / min in N2 is measured. (Weight loss ratio) A ratio of a weight of the sample at the measurement temperature to a weight of the accurately weighed sample is defined as a weight loss ratio (weight %) at the measurement temperature.

The utility model discloses a device for efficiently preparing black phosphorus, which belongs to the technical field of phosphorus chemical new materials and comprises a reactor, a reaction area is arranged in the reactor, a charging mechanism is arranged in the reaction area and comprises an outer lining reaction kettle arranged in the reaction area, a first sealing mechanism is arranged on the top surface of the outer lining reaction kettle, and a lining is arranged in the outer lining reaction kettle. A plurality of flat bottom pipes are arranged in the lining at equal intervals, supporting nets are arranged in the flat bottom pipes, a heating resistance wire is arranged in the reaction area, and a second sealing mechanism is arranged outside the reaction area. The supporting net is placed in the flat-bottom pipe, the catalyst is filled in the flat-bottom pipe under the inert atmosphere condition, then the flat-bottom pipe is placed in the lining, and the phosphorus source is evenly distributed at the bottom of the lining. After the filling is completed, putting the whole lining into an outer lining reaction kettle, sealing the outer lining reaction kettle, and carrying out high-temperature heat treatment in a reaction system through accurately controlled temperature; after the reaction is finished, black phosphorus is deposited and grows in an internal flat-bottom tube, and high-quality black phosphorus crystals are obtained.

The invention discloses a low-cost and green phosphorus coal composite negative electrode material and a preparation method thereof. The preparation method specifically comprises the following steps: pretreating phosphate ore and raw coal; mixing the phosphate ore powder with the raw coal powder to obtain a phosphorus-coal mixed precursor; feeding the phosphorus-coal mixed precursor into a fluidized bed reactor for reaction to generate mixed gas; introducing the mixed gas into a cyclone separator, and separating solid particle impurities; the phosphorus steam is converted into liquid phosphorus, residual phosphorus steam and other impurities are adsorbed, and primary separation of the phosphorus steam from CO and H2 is achieved; and mixing phosphorus steam and H2, introducing the mixture into a CVD reactor, adding the high-specific-surface coal matrix, carrying out a reaction, and carrying out washing and drying. According to the phosphorus-carbon composite material disclosed by the invention, phosphorus steam is uniformly deposited on the surface and pores of a high-specific-surface coal matrix; the porous structure of the high-specific-surface coal matrix provides an expansion buffer space for phosphorus, and meanwhile, part of phosphorus and oxygen-containing functional groups on the carbon surface form chemical bonds, so that the interface bonding strength is enhanced.

The present invention provides a solid electrolyte material that can suppress a decrease in filling efficiency. [Solution] A solid electrolyte material comprising a sulfide solid electrolyte containing lithium, sulfur, and phosphorus, and an organic compound, wherein the organic compound has two or more benzene rings, and the melting point of the organic compound is 82°C or lower.

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.

A method for producing phosphorus in which a reaction for forming gaseous phosphorus (g) by bringing phosphorus oxide generated by heating a liquid phosphoric acid compound into contact with a carbon material to reduce the phosphorus oxide and for condensing the gaseous phosphorus (g) to obtain liquid phosphorus (L) is conducted by a flow reaction with a nonoxidizing gas flow, wherein the reduction reaction of the phosphorus oxide is conducted in a carbon material-packed bed, and the condensation of the formed gaseous phosphorus (g) is substantially conducted in a condensation accelerator-packed bed which is disposed downstream of the carbon material-packed bed in contact with the carbon material-packed bed.

The invention relates to a method for synthesizing black phosphorus - polyglycerol (BP-PG) nanoparticles comprising the step of adding (100) black phosphorus (BP) nanoparticles, glycidol and a plurality of beads (10) to a chamber (21) of a milling device (20) and the step of rotating (200) the chamber (21) over a defined period of time. The invention also relates to a method for recovering a precious metal from a precious metal containing matrix comprising the step of providing (300) the precious metal containing matrix in the form of a solution containing dissolved precious metal ions and the step of adding (400) black phosphorus - polyglycerol (BP-PG) nanoparticles to the solution, wherein the black phosphorus - polyglycerol (BP-PG) nanoparticles are synthesized using the method for synthesizing black phosphorus - polyglycerol (BP-PG) nanoparticles.

This invention relates to the field of oil additives for power generation, specifically a method for in-situ preparation of black phosphorus nanoparticles (BPNPs) using PVA / PAAM interpenetrating network hydrogel as a microreactor and its application as a wear-resistant additive in lubricating oils. The confinement effect of the interpenetrating network hydrogel results in uniform BPNP size and high crystallinity, thus endowing BPNPs with excellent air / water / oil stability, with an oxidation rate of <5% within 7 days. Swelling allows RP / KI to permeate uniformly and be physically embedded in the network. Subsequently, under a nitrogen protective atmosphere, photolysis of iodine ions generates solvated electrons (e). ‑ (aq) restores RP to P ‑ P ‑ The BP crystal nucleus is formed by recombination, and the IPN three-dimensional nanochannels (pore size 30~120nm) confine and inhibit excessive growth of the crystal nucleus. At the same time, the PVA hydroxyl groups and PAAm amide groups passivate the BP surface in situ through hydrogen bonding / coordination, preventing oxidation.

This invention relates to a non-metallic porous carbon anode material, its preparation method, and its application. The preparation method includes: activating a carbon-containing raw material in a hydrogen-containing mixed gas to obtain porous carbon and a benzene-rich hydrocarbon gas; depositing the non-metallic source gas and the porous carbon in a primary deposition; and then depositing the non-metallic source gas and the benzene-rich hydrocarbon gas in a secondary deposition to obtain the non-metallic porous carbon anode material. The carbon-containing raw material is further de-ashed before use, or the porous carbon is de-ashed and then mixed. This invention achieves continuous preparation of porous carbon and non-metallic porous carbon anode materials by activating the carbon-containing raw material with hydrogen. The excess hydrogen generated in this process can be recycled to the hydrogen activation step for reuse. Hydrogen activation enables efficient deoxygenation of the carbon-containing material, avoiding the generation of other oxide impurities during the deposition of non-metals, effectively ensuring the safety of the deposition process. The benzene-rich hydrocarbon byproduct generated during the preparation of porous carbon can further carbonize the material, achieving efficient utilization of carbon resources.

This method for recovering phosphorus includes adding a reducing agent containing at least one of metallic silicon and metallic aluminum and an alkali metal compound to steelmaking slag containing a phosphorus oxide to reduce the phosphorus oxide with the reducing agent in a state including the liquid phase.

The present invention discloses a nitrogen-doped black phosphorus nanosheet / graphene composite material, its preparation method, and application. First, amorphous red phosphorus, a nitrogen-containing compound, and graphene oxide are added to a solvent, followed by a solvothermal reaction at 150-200°C. After the reaction, a product is obtained, which is filtered, washed, and dried to prepare the nitrogen-doped black phosphorus nanosheet / graphene composite material. The prepared nitrogen-doped black phosphorus nanosheet / graphene composite material is modified on a carbon ethylenediamine (CGE) and used for the detection of trace amounts of hydroquinone in the environment, demonstrating excellent sensitivity and promising application prospects.

The invention discloses a purple phosphorus micron tube array and a preparation method thereof. The purple phosphorus micro-tube array has unique structural characteristics, the diameter of a micro-tube is 1-10 [mu] m, the aperture is 0.3-1.7 [mu] m, and the tube length is 10-500 [mu] m. The preparation method comprises the following steps: mixing amorphous red phosphorus (the purity is 99.99%-99.9999%) and iodine elementary substance (the purity is 99.8%-99.99%) according to the mass ratio of 15: 1-25: 1, sealing the mixture in a quartz tube under the vacuum condition of 10 <-4 >-10 <-5 > Pa, and carrying out gradient temperature control through a horizontal double-temperature-zone tubular furnace: heating a medicine zone to 470-520 DEG C at a speed of 2-5 DEG C / min and carrying out heat preservation for 20-25 hours, and synchronously heating a non-medicine zone to 450-460 DEG C; the inclined angle design of 5-60 degrees of the quartz tube is combined with the synergistic effect of double temperature zones, and directional growth of Hittorf purple phosphorus microcrystals is realized through an iodine steam transport mechanism. The method is simplified in process and low in cost, the high-purity purple phosphorus micron tube array is obtained, the band gap is about 1.90 eV, the method can be used for field effect transistors, photoelectric detectors, photo-thermal conversion, photocatalysis and electro-catalysis, and a novel structure semiconductor material is provided for the field of photoelectric devices.

The present invention discloses a method for exfoliating two-dimensional materials based on the synergistic effect of resonance crushing and crystal growth, comprising: crushing a bulk material and uniformly dispersing it in a solvent to form a dispersion; freezing the dispersion to form a solid material; placing the solid material in a low-temperature environment where the temperature is lower than or equal to the freezing point of the solvent, and subjecting the solid material to ultrasonic treatment to resonate the solvent crystallized between layers, so that at least part of the crystallized solvent is crushed, and at the same time enabling the liquid solvent in the surrounding environment to enter the broken gaps and continue to solidify and crystallize in this low-temperature environment. With the continuous crushing and growth of the crystals between the material layers, two-dimensional materials are finally exfoliated from the bulk material; the surface tension of the solvent matches the surface energy of the two-dimensional material. The method for exfoliating two-dimensional materials of the present invention is convenient to operate, has a small solvent usage amount, high exfoliation efficiency, good quality of the exfoliated two-dimensional materials, is suitable for large-scale production, and has potential industrialization value.

The utility model discloses an ash bucket deslagging device for phosphorus sludge recovery treatment, which comprises a support frame, a stock bin and a blanking barrel, and is characterized in that the stock bin is arranged at the upper part of the support frame, the stock bin is of a cylindrical structure, an annular reinforcing rib is arranged outside the stock bin, the blanking barrel is arranged at the bottom of the stock bin, and a blanking valve is arranged at the lower part of the blanking barrel; a conveying groove is formed in the lower middle portion of the supporting frame, the bottom end of the discharging barrel is connected with the conveying groove, two conveying shafts are arranged in the conveying groove side by side, and a plurality of conveying blades are arranged outside the conveying shafts; the conveying motor is arranged at one end of the conveying groove and connected with one side of the gearbox through the coupler, the conveying shaft is installed on the other side of the gearbox, the conveying motor drives the conveying shaft to rotate, and dust in the stock bin can be efficiently and rapidly discharged.

This invention proposes a method for preparing black phosphorus nanosheets, comprising the following steps: Step 1, preparing an electrolyte, including adding tetrabutylammonium hexafluorophosphate to an organic solvent to obtain an electrolyte; Step 2, electrochemical cathode stripping, including immersing the anode and cathode in the electrolyte, applying a direct current, and reacting to obtain a precipitate, which is the black phosphorus nanosheet; the cathode comprises black phosphorus. This invention also proposes a black phosphorus nanosheet, a black phosphorus-modified interdigitated electrode and its preparation method, and a multifunctional flexible sensor incorporating the interdigitated electrode. The method for preparing black phosphorus nanosheets provided by this invention has high production efficiency and is expected to be applied to large-scale industrial production. The multifunctional flexible sensor can respond to breathing frequency, light, and strain with high responsivity, realizing the fabrication of multifunctional integrated devices.

The invention provides a method for recovering waste lithium iron phosphate powder, and relates to the technical field of solid waste resource recovery. The method comprises the following steps: mixing waste lithium iron phosphate powder with silicon powder, and carrying out silicothermic reduction under a vacuum condition to obtain steam (lithium and phosphorus steam) and solid residues (comprising silicon dioxide and silicon iron); carrying out condensation separation on the steam to respectively obtain lithium and phosphorus; and the solid residues are subjected to magnetic attraction separation, and ferrosilicon is obtained. According to the method, the waste lithium iron phosphate powder is recovered by adopting a method of combining vacuum metallurgy silicothermic reduction with condensation separation and magnetic attraction, no harmful gas and waste liquid are generated, the method is safe and environment-friendly, comprehensive recovery of Li, P and Fe is realized, the process is simple, and the metal recovery rate is high. Results of the embodiment show that when the waste lithium iron phosphate powder is recycled through the method, the reduction rate of lithium ranges from 98.67% to 99.97%, and the reduction rate of phosphorus ranges from 99.87% to 99.91%.

The application relates to a method for recovering liquid-phase phosphorus and acetic acid by co-hydrothermal carbonization of fish paste and cellulose acetate, and belongs to the technical field of waste resource utilization and clean energy preparation. The method comprises the following steps: (1) mixing fish paste and cellulose acetate according to a mass ratio of 1:3-3:1, and carrying out hydrothermal carbonization at 200-240 DEG C for 0.5-2 h; (2) carrying out solid-liquid separation on the hydrothermal carbonization product to obtain liquid products and solid products; (3) recovering liquid-phase phosphorus and acetic acid from the liquid products; and (4) using the dried solid products as clean solid fuel. The application realizes the collaborative treatment of fish paste and cellulose acetate through a single process, simultaneously completes the recovery of phosphorus and acetic acid and the preparation of solid fuel, does not need to add chemicals, and has the advantages of simple process flow, low cost and environmental friendliness.

Provided are a black phosphorus-two dimensional material complex and a method of manufacturing the black phosphorus-two dimensional material complex. The black phosphorus-two dimensional material complex includes: first and second two-dimensional material layers, which each have a two-dimensional crystal structure and are coupled to each other by van der Waals force; and a black phosphorus sheet which between the first and second two-dimensional material layers and having a two-dimensional crystal structure in which a plurality of phosphorus atoms are covalently bonded.

The invention belongs to the technical field of new phosphorus chemical materials and relates to a one-step efficient synthesis of Sn 24 P 19.3 Preparation method of I8 catalyst. The present invention uses red phosphorus, tin and iodine as raw materials, controls the multi-stage temperature rise and fall cycle heat treatment program, and directly synthesizes high-purity Sn in one step reaction. 24 P 19.3 I8 catalyst and one-step synthesis of supported Sn with promoter 24 P 19.3 I8 catalyst realizes efficient, low-cost and environmentally friendly synthesis of catalysts, greatly improves the preparation scale and efficiency of catalysts, reduces energy consumption and environmental impact in the production process, and the prepared catalyst shows extremely high catalytic activity and stability in the black phosphorus preparation process, laying a solid foundation for the low-cost and large-scale preparation of black phosphorus, and also provides a raw material basis for the preparation and development of other new elemental phosphorus.

The invention relates to the technical field of battery raw materials, and discloses a double-zone synthesis method of a high-quality black phosphorus / carbon composite material, which comprises the following steps: 1) mixing red phosphorus and a carbon material, and placing the mixture in a closed and vacuum quartz tube; 2) carrying out secondary annealing treatment on the quartz tube; (3) carrying out ball milling treatment; 4) preparing a special-shaped double-zone quartz tube; 5) placing red phosphorus and a mineralizing agent at the raw material end of the special-shaped double-zone quartz tube; (6) vacuumizing and sealing the special-shaped double-zone quartz tube, and then carrying out heat treatment on the special-shaped double-zone quartz tube; 7) taking out the naturally cooled black phosphorus / carbon composite material in a vacuum environment, washing, filtering and drying; the uniform red phosphorus layer loaded on the surface of the carbon material can be converted into black phosphorus, the good crystallinity and lamellar structure of the black phosphorus material can be ensured, and composite materials of different specifications can be obtained.

The invention relates to a method for synchronously preparing one-dimensional and two-dimensional Hittorf purple phosphorus alkene nano-materials, which comprises the following steps: by taking amorphous red phosphorus with different purities as a raw material, firstly, growing crystal Hittorf purple phosphorus alkene on a double-temperature-zone tubular furnace through an iodine steam transport method, and then, preparing one-dimensional and two-dimensional Hittorf purple phosphorus alkene nano-materials through conventional liquid-phase stripping and syrup ball-milling stripping technologies, thereby obtaining the one-dimensional and two-dimensional Hittorf purple phosphorus alkene nano-materials. The Hittorf purple phosphorus alkene nanobelt and nanosheet one-dimensional and two-dimensional nanometer materials are synchronously prepared and obtained. The prepared Hittorf purple phosphorus alkene nano material has a forbidden band width range of 1.80-2.5 eV, can be used for photoelectric detectors, photocatalytic hydrogen production, carbon dioxide reduction and organic matter degradation, can also be applied to lithium ion battery negative electrodes, and has a great application prospect. Meanwhile, the preparation method is simple, the manufacturing cost is low, and large-scale preparation is facilitated.

The invention provides a preparation method of a two-dimensional nanometer black phosphorus-based cadmium sulfide-doped heterojunction material, and relates to the technical field of nanometer material photocatalysis. The method comprises the following steps: preparing a two-dimensional nano black phosphorus / red phosphorus composite material by taking red phosphorus as a raw material, and doping cadmium sulfide on the basis of the black phosphorus / red phosphorus composite material to construct the heterojunction. The two-dimensional nano black phosphorus-based cadmium sulfide-doped heterojunction material disclosed by the invention is increased in photocatalytic sites and increased in specific surface area, has efficient photocatalytic ability, and can be used for decomposing water to generate hydrogen.

The application discloses a preparation method of black phosphorus / molybdenum disulfide nanoflower composite materials and application of the black phosphorus / molybdenum disulfide nanoflower composite materials in detection of foodborne pathogenic bacteria, and has the characteristics that the preparation method comprises the following steps: (1) black phosphorus nanosheets are prepared by using a hierarchical centrifugation assisted liquid phase exfoliation method; and (2) the black phosphorus / molybdenum disulfide nanoflower composite materials are prepared by using a hydrothermal method: 10 ml of the black phosphorus nanosheet aqueous solution prepared in the step (1), 5 ml of an ammonium molybdate aqueous solution and 5 ml of a thiourea aqueous solution are sequentially transferred into a polytetrafluoroethylene-lined stainless steel autoclave, the mixture is allowed to react at 200 DEG C for 24 hours after ultrasonic treatment, and then the black phosphorus / molybdenum disulfide nanoflower composite materials are obtained by washing with ethanol and deionized water several times, and can be used for detection of foodborne pathogenic bacteria and preparation of antibacterial agents, and the black phosphorus / molybdenum disulfide nanoflower composite materials have the advantages that the detection sensitivity of the foodborne pathogenic bacteria is improved, and the black phosphorus / molybdenum disulfide nanoflower composite materials have the functions of photothermal and photocatalytic synergistic antibacterial.

The invention relates to a method for recovering phosphorus in the form of chloride, in which sewage sludge ash having a phosphorus content of at least 2% by weight, expressed as the weight percent of elemental phosphorus in the ash, is reacted with elemental chlorine in the presence of a carbon source at a temperature of 350 DEG C to 900 DEG C, and the formed phosphorus chloride is removed from the exhaust gas stream.