9 results about "Sublimed sulphur" patented technology

The invention discloses a WS2 / W composite material, a preparation method thereof and application of the WS2 / W composite material in a sodium-sulfur battery. The preparation method comprises the following steps: uniformly stirring isopropanol and acetone to obtain a mixed solution A; weighing tungsten hexachloride, adding the tungsten hexachloride into the mixed solution A, and uniformly stirring to obtain a mixed solution B; transferring into a reaction kettle, sealing and putting into a drying oven for reaction; after the reaction is finished, carrying out suction filtration and washing on a product by using industrial alcohol, and drying in a vacuum oven to obtain W18O49 powder; the method comprises the following steps: weighing W18O49 powder and sublimed sulfur, respectively and correspondingly placing the W18O49 powder and sublimed sulfur in a first porcelain boat and a second porcelain boat, then placing the second porcelain boat in the first porcelain boat, placing the second porcelain boat in a tubular furnace, introducing argon into a furnace chamber of the tubular furnace, after the pressure of the furnace chamber is increased to 0.2-0.3 MPa, keeping the airtightness of the system, heating to 1100-1300 DEG C at the rate of 20 DEG C / min, keeping the pressure at 0.2-0.3 MPa in the heating process, and keeping the temperature for 2-3 hours; and after the temperature reaches 1100-1300 DEG C, continuously preserving heat for 2 hours, introducing argon, cooling to room temperature, and collecting to obtain WS2 / W powder. The problems of poor conductivity of the sulfur positive electrode, polysulfide shuttle effect and slow reaction kinetics are solved.

The application relates to polysulfide technology, in particular to a high-concentration polysulfide solution preparation method and application in a liquid flow battery. The application directly reacts cheap alkali metals with sublimed sulfur to obtain a high-concentration sulfide solution. Different sulfur content solutions have corresponding standard hydrogen electrode potentials, wherein high-sulfur-content solutions such as X2S8 have the highest potential and can be used as the positive electrode of the liquid flow battery, the X2S4 with the lowest potential can be used as the negative electrode of the liquid flow battery, X=Li, Na or K, and the sulfur content of X2S8 is twice that of X2S4. The high-concentration sulfide content makes the theoretical energy density of the liquid flow battery exceed 80 Ah L ‑1 .

The present application belongs to the field of sulfur dioxide production, and particularly relates to an improved sulfur dioxide production method with reduced sublimed sulfur. The method of the present application improves production efficiency by controlling the sulfur feeding frequency of a sulfur incinerator, stabilizing the liquid level of the sulfur incinerator, optimizing the sublimed sulfur discharge mode of a wire mesh tower, and controlling the outlet temperature of a cooling tower. The method can be adjusted according to actual production conditions, reduces the generation of sublimed sulfur and system resistance, prolongs the service life of a felt filter, has high energy utilization rate, and is thus suitable for industrial large-scale production.

The application discloses a MOFs derived iron sulfide heterogeneous electro-Fenton catalyst, a preparation method thereof and application of the catalyst in degradation and removal of organic pollutants. The preparation method of the catalyst is as follows: iron metal organic framework material MOFs and sublimed sulfur are mixed, supercritical technology is used to make the sulfur easily enter the MOFs material channel, and then calcination is performed to make the MOFs framework collapse, and the sulfur element reacts with the metal iron element to generate iron sulfide, so that the electron transfer efficiency of the material is further improved, and the pH of the Fenton reaction is widened. The catalyst synthesis process is simple, convenient and controllable, the prepared granular catalyst is applied to a heterogeneous electro-Fenton system, has good catalytic effect, and overcomes the defect that a traditional electro-Fenton catalyst is difficult to recover. The method provides an innovative method for a heterogeneous electro-Fenton cathode.

The invention relates to the technical field of petroleum refining, in particular to an in-situ presulfurization method of a hydrogenation catalyst taking sublimed sulfur as a sulfurizing agent, which comprises the following steps: step 1, dissolving sublimed sulfur solid in an organic solvent to form a sulfurizing agent solution, mixing the sulfurizing agent solution with hydrogen, and heating to sulfurization temperature; 2, the mixed material obtained in the step 1 is injected into a hydrogenation reactor, the hydrogenation reactor is filled with a hydrogen sulfide initiator and an oxidation-state catalyst to be vulcanized, and the hydrogen sulfide initiator is located on the upstream of the oxidation-state catalyst; and step 3, carrying out heating vulcanization on the mixed material under preset reaction conditions, carrying out gas-liquid separation on a reaction product, recycling a gas-phase product, and supplementing sublimed sulfur to a liquid-phase product for cyclic utilization. According to the present invention, the cheap and low-toxicity sublimed sulfur is adopted to replace the traditional CS2 or DMDS vulcanizing agent, such that the flammable, explosive, high-toxicity and other problems are solved, the vulcanization effect is equivalent to the vulcanization effect in the prior art, the existing hydrogenation device does not need to be transformed, and the significant safety and the significant economy are provided.

The invention discloses a phosphorus-free high-temperature corrosion inhibitor which is characterized by comprising the following components in parts by mass: 10-40 parts of organic polysulfide; the general formula of the organic polysulfide is R-Sx-R, R is an alkyl group containing 8 to 14 carbon atoms or a naphthenic base group or an aromatic group, and x ranges from 2 to 8; the structural formula of the nitrogen-containing boric acid ester is shown in the specification, wherein R is an alkyl group containing 10-18 carbon atoms. The corrosion inhibitor has an adsorption film and a reaction film at the same time, under the synergistic effect of the adsorption film and the reaction film, a protective film on the metal surface is more compact, and the corrosion inhibition effect of the phosphorus-free corrosion inhibitor is greatly improved. In addition, the corrosion inhibitor is stable in quality and performance, sublimed sulfur and boric acid in the raw materials are low in cost, and popularization and application in refinery plants are facilitated.

The application discloses a preparation method of concentration-dependent red light sulfur quantum dots and the red light sulfur quantum dots. The preparation method comprises the following steps: grinding, and reacting with sublimed sulfur, inorganic alkali and a heterocyclic functional reagent as raw materials and hydrogen peroxide as an etching agent; and then performing dialysis and freeze-drying to obtain the red light sulfur quantum dots. The heterocyclic functional reagent is a nitrogen-containing heterocyclic compound, and is at least one of 2-aminothiazole, imidazole-2-formaldehyde and 2-aminooxazole. The three SQDs all have concentration dependence, and the optimal emission wavelength is gradually red-shifted with the increase of the SQD concentration, and the maximum red shift is 130 nm. The maximum emission wavelength of the prepared SQDs can reach 690 nm, which indicates that the SQDs are red light emission fluorescent nanomaterials, and the fluorescence wavelength red shift can be attributed to non-radiative transition due to molecular assembly at a high concentration, i.e. fluorescence resonance energy transfer, and production of new emission centers. The application provides a new strategy for the research of concentration-dependent nanomaterials and red light emission SQDs.

The invention provides a method for synergistically recovering rare and noble metals in a waste lithium battery and a waste automobile catalyst, which comprises the following steps: mixing black powder of the waste lithium battery, sublimed sulfur and a carbon source, and then adding desulfurized gypsum or calcium sulfate to obtain a mixed material; placing the mixed material in an inert atmosphere or under a vacuum condition, and performing sulfuration reduction roasting to obtain a roasted product; the roasted product is added into water to be subjected to water leaching treatment, suction filtration separation is conducted after stirring leaching, and a lithium sulfate solution and water leaching residues are obtained; and drying the water leaching residues, uniformly mixing the dried water leaching residues with a waste automobile catalyst and a slagging compensation agent, and carrying out matte smelting in a high-temperature smelting container to obtain nickel-cobalt matte enriched with platinum group metals (PGMs) and smelting slag. The lithium recovery rate can reach 99% or above, the nickel recovery rate exceeds 99%, the cobalt recovery rate exceeds 98%, and the recovery rate of platinum group metals (PGMs) is 90% or above.