17 results about "Thermal dissolution" patented technology

The invention belongs to the field of spectrum chemical analysis, and particularly relates to a detection method for measuring the silver content in crude copper through atomic absorption spectrometry. The method comprises the following specific steps: dissolving with nitric acid, adding bromine water and hydrochloric acid, steaming to be nearly dry, and leaching with hydrochloric acid; if particles which are not completely dissolved exist only by using nitric acid and hydrochloric acid, filtering, adding a saturated ammonium bifluoride solution, nitric acid-sulfuric acid mixed acid and perchloric acid, heating and dissolving, smoking until smoke is exhausted, adding hydrochloric acid for leaching, transferring into a volumetric flask (not separately taken), taking hydrochloric acid as a medium, matching a copper matrix with a silver standard solution, acetylene as fuel gas and air as combustion-supporting gas, and performing gradient elution to obtain the copper-silver alloy. And measuring the silver content on an atomic absorption spectrometer. The method has the characteristics of simplicity in sample pretreatment, high detection result accuracy, good precision, simplicity in operation, high practicability and the like.

The invention relates to a method for strengthening graded depolymerization of lignite through low-temperature pyrolysis and oxidation pretreatment, which comprises the following steps: weighing lignite, putting the lignite into a low-temperature pyrolysis system, introducing inert gas, carrying out pretreatment until the temperature reaches the low-temperature pyrolysis temperature, naturally cooling to room temperature after the pyrolysis is ended, and collecting semicoke in the system; adding the semicoke, an oxidizing agent, an oxidizing auxiliary agent, an additive and a solvent into a system, carrying out oxidation pretreatment at room temperature in an air atmosphere, and filtering and separating to obtain residues; adding the residues and a solvent into a system, and introducing inert gas to carry out thermal dissolution polymerization reaction; and after the reaction is finished, cooling the system to room temperature, collecting gas in the system, and filtering and separating solid residues and soluble substances. According to the method, the physicochemical structure of the lignite is regulated and controlled through a low-temperature pyrolysis pretreatment process, and relatively strong ether bonds are weakened by utilizing a mild oxidation pretreatment method, so that the yield of lignite depolymerization products is improved, and the process of obtaining chemicals through lignite grading depolymerization is enhanced.

To provide a method for thermally solubilizing excess sludge generated during sewage treatment in a short period of time by treating the excess sludge in a thermal solubilization apparatus.SOLUTION: The excess sludge thermal solubilization apparatus used in the method of the present invention consists of a heat exchanger, a steam boiler that serves as the heat source for thermal solubilization, a steam supply valve, a steam pressure reducing valve set, a steam trap set, and an excess sludge supply pump. The product of thermal solubilization using the method of the present invention can be used as a nutrient source for the cultivation of heterotrophic and mixotrophic microalgae.SELECTED DRAWING: Figure 1

The invention discloses a preparation method of a copper-mediated multi-active-site catalyst and application of the copper-mediated multi-active-site catalyst in thermal dissolution polymerization of low-rank coal, copper nitrate, cobalt nitrate and cerous nitrate are dissolved in deionized water in proportion, heated and stirred to be uniform, and a sodium hydroxide solution is dropwise added for co-precipitation to obtain turbid liquid; and carrying out low-temperature crystallization, high-temperature hydrothermal treatment, centrifugal washing to be neutral, vacuum drying, grinding into powder, high-temperature calcination, cooling and hydrogen reduction to finally obtain the Cu / CoOx-CeO2 catalyst. The catalyst has the advantages of excellent hydrogenation reduction capacity, high product selectivity, low preparation cost and the like, and low-rank coal depolymerization can be realized in various reaction solvents; for hydrogenation reaction of dimer or monomer model compounds such as 2-phenoxy-1-phenethyl alcohol, not only can catalytic transfer hydrogenolysis of C-O bonds be realized in low-carbon alcohol, but also intramolecular self-hydrogen transfer hydrogenolysis can be realized by utilizing self structural characteristics of a substrate, so that the atom utilization rate is increased.

The application discloses a kind of poly (heteronaphthalene-biphenyl) poly (aryl ether ketone) resin hot dissolution process, it is related to the field of polymer processing technology. Including the following steps: poly (heteronaphthalene-biphenyl) poly (aryl ether ketone) resin powder is added into organic solvent, and initial mixture is obtained by low-speed stirring mixing;The initial mixture is heated to swelling temperature, and resin particles are fully swollen;Then continue to heat to dissolution temperature, and then constant-temperature stirring is carried out until completely transparent and uniform solution is obtained;Solution is constant-temperature stirring ripening, and after ripening is completed, it is cooled under low-speed stirring, and finally filtered, to obtain clear and transparent poly (heteronaphthalene-biphenyl) poly (aryl ether ketone) resin solution. By using optimized hot dissolution procedure, matching specific solvent system, and combining accurate temperature and time parameter control, rapid and complete dissolution of poly (heteronaphthalene-biphenyl) poly (aryl ether ketone) resin is realized, which has high solid content, low viscosity and excellent long-term storage stability, and meets the needs of industrial processing.

The invention discloses a component analysis method of a polypropylene material, and relates to the technical field of material detection, and the component analysis method comprises the following steps: carrying out thermal analysis on a polypropylene material sample; and respectively carrying out the following treatments on the polypropylene material sample: carrying out high-temperature calcination to obtain an ash component; freezing and grinding, thermally dissolving the ground sample in a first organic solvent, cooling and carrying out cold separation to separate out a main component, and adding a second organic solvent into the obtained first filtrate to separate out a flexibilizer component; performing Soxhlet extraction on the ground sample by adopting a third organic solvent to obtain an additive component; and finally, carrying out qualitative or quantitative analysis on the separated components. By adopting the parallel separation steps of high-temperature calcination, hot dissolution, cooling and cold separation and Soxhlet extraction and utilizing the solubility difference of the main body component and the flexibilizer component at different temperatures, the effective separation of components with similar physicochemical properties is realized, and the cross interference among the components is reduced.

The invention discloses airflow stretching auxiliary drying coupling type PVA blow spinning equipment, which belongs to the technical field of spinning and comprises a base, a blow spinning box is arranged at one end of the top of the base, a support is arranged at the other end of the top of the base, and spinning forming drying mechanisms are uniformly arranged at the top in the blow spinning box along the circumferential direction. The stirring mechanism and the solution conveying mechanism are linked through the driving mechanism, the solution conveying mechanism can be matched with the filtering mechanism to form a negative pressure environment when working, rapid filtering and purifying of the PVA solution are achieved, manual transferring or additional filtering power devices are not needed, and the whole process comprises the steps of raw material mixing, heating and dissolving, solution storage and filtering and purifying; the whole process is completed in an integrated linkage mode, manual intervention links are greatly reduced, operation complexity is lowered, pollution and gel risks in the solution transferring process are avoided, the automation degree and production efficiency of equipment are remarkably improved, and meanwhile energy consumption is saved.

The utility model relates to the technical field of oil field auxiliary use equipment, in particular to a hollow rod thermal well washing wellhead device which comprises a mounting plate, the upper end face of the mounting plate is fixedly connected with a heating box, the lower end face of the mounting plate is fixedly connected with a fixing frame, and the lower end face of the fixing frame is fixedly connected with a sleeve through a pipe hoop. A high-temperature-resistant oil pump is arranged on the left side of the heating box, heat conduction oil flows through a circulating pipe, is guided out from one side of the heating box, passes through a sleeve and then returns to the heating box, so that thick oil or paraffin in an oil pipe on the pump can be heated and dissolved, the heat efficiency is high, and compared with a traditional cleaning mode, well washing water cannot enter a stratum or pollute an oil layer; well washing water is not pumped out by oil pumping sand, oil well production is not affected, high-benefit hot well washing can prolong the oil well production period, heating rods in the heating box can continuously heat conduction oil, heat recycling is achieved, the working efficiency is improved, and compared with water, the heating effect of the conduction oil is better.

The invention relates to the technical field of metal element determination, in particular to a method for determining the content of platinum group metal in a vehicle catalyst. The method comprises the following steps: acquiring a uniform sample of a vehicle catalyst sample; adding an alkaline flux into the sample, heating, and completely reacting to form a uniform frit; performing water dissolution and acidification treatment on the frit to form an acidified solution; adding an oxidizing agent into the acidified solution to oxidize the platinum group metal to a stable high valence state; adding a tellurium solution, heating, adding a stannous chloride solution, and continuously heating until a black precipitate is generated; standing and aging the precipitate, filtering, and washing with hydrochloric acid and deionized water in sequence to remove impurity ions; heating and dissolving the washed precipitate with aqua regia; and determining the content of the platinum group metal in the dissolved solution after metering the volume of the dissolved solution. According to the method, efficient and complete decomposition of the sample can be achieved, and meanwhile multiple key platinum group metal elements such as platinum, palladium, rhodium, ruthenium and iridium can be accurately determined.

This invention discloses a separation and purification system for potassium nitrate production, comprising a stirred dissolving vessel, a filter, a crystallization and washing machine, a fluidized bed dryer, and a packaging machine connected sequentially. The stirred dissolving vessel consists of an upper crushing chamber and a lower dissolving chamber. A heating jacket is installed outside the dissolving chamber. A stirring shaft is vertically installed inside the stirred dissolving vessel, penetrating from top to bottom through the crushing and dissolving chambers. Stirring wheels are installed on the outer walls of both chambers, and a motor is installed at the downward extension of the stirring shaft. A filter screen is installed at the connection between the upper and lower parts of the crushing and dissolving chambers. This invention, by setting up a crushing and dissolving chamber within the stirred dissolving vessel, crushes lumpy potassium nitrate into powder before dissolving it. Furthermore, the crushing in the crushing chamber and the stirring and thermal dissolution in the dissolving chamber are achieved through the same stirring shaft, integrating crushing and thermal dissolution into one system. This saves on equipment investment costs and improves production efficiency.

The application discloses a coal direct liquefaction residue solvent extraction deashing method, refined pitch and application, and relates to the technical field of solid waste resource treatment. The method improves the hot dissolution effect of the extractant and the liquefaction residue by reasonably controlling the process conditions and process parameters, mixes the scale inhibitor composed of multi-hydrocarbon-based organic matter, an additive and coking wash oil with the extractant, adds the ground liquefaction residue into the obtained mixture, and prepares a slurry by controlling the stirring speed, the reaction temperature and the like. The addition of the scale inhibitor improves the concentration of the residue extraction liquid, and enhances the treatment capacity and efficiency. The filter used for precision filtration is a stainless steel sintered filter element, which can resist high temperature and pressure, is helpful to prolong the service life, and is more conducive to the stripping of the pitch and other viscous substances in the liquefaction residue. The prepared ultra-low-ash refined pitch can be used as a high-quality raw material of high-end carbon materials.

The invention discloses a hard-water-resistant efficient anti-corrosion foam dust suppressant for a coal mine and a preparation method of the hard-water-resistant efficient anti-corrosion foam dust suppressant, and the dust suppressant consists of the following components in percentage by weight: 6.0-12.0% of polyoxyethylene fatty acid ester serving as a surfactant, 0.5-2.0% of citric acid serving as a chelating agent, 0.5-2.5% of phytic acid serving as a corrosion inhibitor, 2.0-5.0% of polyether modified siloxane serving as a foam stabilizer and the balance of water. 0.2%-0.8% of carboxymethyl cellulose serving as a foam booster, 0.5%-2.0% of nano cellulose serving as an auxiliary additive and the balance of deionized water; the preparation method comprises the following steps: heating the deionized water, adding the citric acid, then adding the surfactant, heating for dissolving, then sequentially adding the corrosion inhibitor, the foam stabilizer and the foam booster, and finally adding the nano-cellulose. The preparation process is simple, the cost is low, the production process is safe and environment-friendly, and the prepared dust suppressant has excellent hard water adaptability, strong corrosion resistance and foam stability.

The invention provides a method for recovering residual heavy oil and asphalt components from coal liquefaction residues, and belongs to the technical field of coal liquefaction residue treatment. The method comprises the following steps: S1, mixing the coal liquefaction residues, a hot-melting solvent and a viscosity reducer, performing hot melting, and performing solid-liquid separation to obtain a hot-melting mixture and hot-melting residues; s2, condensing the hot-melt mixture to obtain a hot-melt substance and a recycled hot-melt solvent; s3, mixing the hot-melt residues, the hot-melt solvent and the viscosity reducer, repeating the operation processes of the step S1 and the step S2, and repeating the steps for a plurality of times; and S4, the hot melt residues finally obtained in the step S3 are dried and subjected to rapid pyrolysis, and residual heavy oil and asphalt components are recycled. According to the method, the pyrolysis strong cohesiveness of the liquefied residues is reduced through step-by-step hot melting treatment of the hot melting solvent and the viscosity reducer, part of heavy oil and asphalt substances are recycled, meanwhile, energy consumption in the solvent recycling process is reduced through the fractional condensation technology, and finally the recycling rate of the heavy oil and the asphalt substances is further increased through rapid pyrolysis of the hot melting residues.

The invention provides a method for preparing a carbon material through step-by-step hot melting of coal liquefaction residues, and belongs to the technical field of coal liquefaction residue recovery. The preparation method comprises the following steps: carrying out step-by-step hot melting on the coal liquefaction residues and a plurality of different solvents in a plurality of stages, and carrying out separation in each stage to respectively obtain asphalt raw materials with different aromatic ring numbers; and carbonizing and / or activating the asphalt raw materials with different aromatic ring numbers to obtain the carbon material. According to the method, coal liquefaction residues are used as raw materials, asphalt raw materials with different aromatic ring number distribution are obtained in a step-by-step hot melting mode, and the asphalt raw materials are respectively carbonized and activated to prepare carbon materials with different functions and purposes.

A method of producing powdered polyamide includes: a step 1 of heating and dissolving a polyamide resin composition in a metal chloride alcohol solution containing a metal chloride and an alcohol to obtain a polyamide thermal dissolution liquid; a step 2 of diluting the polyamide thermal dissolution liquid with an alcohol to obtain an alcohol dilution; and a step 3 of cooling the alcohol dilution to cause precipitation of powdered polyamide. The mass proportion of metal chloride relative to 100 mass % of the metal chloride alcohol solution in step 1 is 23 mass % to 35 mass %, the polyamide thermal dissolution liquid contains 0.2 mol to 2.5 mol of water relative to 1 mol of metal chloride in step 1, and the polyamide thermal dissolution liquid is diluted without dropping below a temperature of 50° C. in step 2.

The invention discloses a thermal dissolution process of phthalazinone polyaryletherketone resin, and relates to the technical field of high polymer material processing. Comprising the following steps: adding phthalazinone polyaryletherketone resin powder into an organic solvent, and stirring and mixing at a low speed to obtain an initial mixture; heating the initial mixture to a swelling temperature, so that the resin particles are fully swelled; continuously heating to a dissolving temperature, dissolving, and stirring at a constant temperature until a completely transparent and uniform solution is obtained; stirring and curing the solution at a constant temperature, cooling under low-speed stirring after curing, and finally filtering to obtain a clear and transparent poly (phthalazinone ether ketone) resin solution. By adopting an optimized thermal dissolution procedure, matching with a specific solvent system and combining with accurate temperature and time parameter control, rapid and thorough dissolution of the phthalazinone polyaryletherketone resin is realized, and the phthalazinone polyaryletherketone resin has high solid content, low viscosity and excellent long-term storage stability, and meets industrial processing requirements.

The present application relates to mineral content detection technical field, specifically a kind of method for determining fluorite in dolomite fluorite ore.This method will be through roasting again adding acetic acid dissolution, adding chromium internal standard solution, after dilution with dilute acid, the mass of calcium oxide in the measured liquid is determined by inductively coupled plasma emission spectrometer, then the mass of calcium fluoride is calculated according to the mass curve of calcium oxide;Another sample is added with chromium internal standard solution, tartaric acid, boric acid, hydrochloric acid to prepare the measured liquid by heating dissolution;The fluorite content is calculated by difference method again.The present application is roasting, dolomite is easily dissolved in acetic acid, avoids the positive interference caused by incomplete decomposition;At the same time, the present application has the advantages of simple operation, fast analysis speed, high accuracy and accuracy, wide content range of fluorite that can be determined, etc., and is convenient for popularization and application.