256results about How to "Short reaction time" patented technology

The invention discloses high-purity oxamide with concentrated particle size and spherical morphology, a preparation method of the high-purity oxamide and application of the high-purity oxamide in preparation of a slow-release fertilizer, and belongs to the technical field of oxamide synthesis and application. The method comprises the following steps: mixing an ammonia-alcohol solution and an alcohol ester solution, conveying the mixed solution into a series tubular reactor for reaction, and then conveying the mixed solution into a parallel tubular reactor for reaction after pressure stabilization and flow equalization to obtain a reaction solution containing oxamide; performing flash evaporation on the reaction liquid to obtain flash evaporation liquid and flash evaporation gas, and performing solid-liquid separation on the flash evaporation liquid to obtain solid oxamide and filtrate; and drying the solid oxamide to obtain the oxamide. The method realizes high conversion rate and high purity, and the product has ultrafine particle size distribution. The purity of the prepared oxamide is greater than or equal to 99%, the D50 particle size is concentrated to 50 + / -15 microns, the spherical morphology is uniform, the release is stable, and the oxamide has a very good effect in preparation of long-acting slow-release fertilizers and combustion inhibitors and research on the nitrogen utilization rate.

The invention discloses a catechol side group-containing polylysine derivative as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) dissolving catechol acid in an organic phase, firstly adding NHS, stirring and dissolving until the materials are uniformly mixed, then adding EDC.HCl, and stirring and reacting to obtain a catechol-NHS intermediate solution; (2) dissolving polylysine or a salt thereof in a water phase, and adjusting the pH value to 6.0-7.0 by using an alkaline solution to obtain a solution of polylysine or a salt thereof; and (3) adding the intermediate solution obtained in the step (1) into the polylysine or the salt solution thereof obtained in the step (2), and maintaining the pH value of the reaction system at 5.0-6.0 by using an alkaline solution to obtain the catechol side group-containing polylysine derivative. The preparation method is short in reaction time and mild in reaction condition, and the obtained product is high in grafting rate and high in raw material conversion rate and has a good application prospect in the aspects of tissue adhesives and the like.

The invention discloses a micro-channel reactor and micro-channel reaction equipment, the micro-channel reactor comprises a reaction plate, a support transition plate and a heat exchange plate which are connected in a laminated manner, grooves are processed in the reaction plate to form micro-reaction channels, grooves are processed in the heat exchange plate to form heat exchange channels, and the support transition plate is separated between the reaction plate and the heat exchange plate; the micro-reaction channel comprises at least two micro-channel units and a middle flow channel connected with the adjacent micro-channel units, each micro-channel unit comprises a flow channel inlet, a flow channel outlet and a heart-shaped mixing cavity, an arc-shaped flow baffle and at least one turbulent flow column are arranged in the heart-shaped mixing cavity, the concave side of the arc-shaped flow baffle faces the flow channel inlet, and the convex side of the arc-shaped flow baffle faces the turbulent flow column. And the turbulent flow column is arranged between the arc-shaped flow baffle and the flow channel outlet. Through cooperation of the heart-shaped mixing cavity, the arc-shaped flow baffles and the turbulent flow columns, the particle suspension rate and the mass transfer capacity of the micro-reaction channel are effectively improved, then the reaction efficiency is improved, and the device can be used for achieving continuous preparation of nano-drugs.

The invention discloses a method for preparing nitro-mesitylene through a micro-channel nitration reaction. The method comprises the following steps: respectively conveying mesitylene, fuming nitric acid and sulfuric acid to a micro-channel reaction module through a metering pump, and completing nitration reaction within a retention time of tens of seconds to several minutes. The introduction sequence of nitration reaction materials, the reaction retention time and the reaction temperature are cooperatively controlled, the nitration reaction is completed in the microchannel reactor in a continuous flow mode, operation is easy and convenient, safety is high, efficient continuous production can be achieved, meanwhile, emission of three wastes is reduced, and the industrial application advantages of being environmentally friendly and economical are achieved.

This invention discloses a continuous synthesis apparatus and process for nitrobenzene. The synthesis apparatus includes a mixed acid preparation system, a continuous benzene nitration system, an organic phase continuous stratification system, and a continuous water washing-alkali washing-water washing system. The process includes: concentrated sulfuric acid and concentrated nitric acid are pumped into the mixing module of the mixed acid preparation system to obtain a mixed acid solution; benzene and the mixed acid solution are pumped into the microchannel reactor of the continuous benzene nitration system; the nitrated material is cooled and then pumped into the continuous organic phase stratification system; the resulting intermediate organic phase nitrate enters the next processing unit; the organic phase nitrate and water enter the continuous water washing-alkali washing-water washing system for washing to obtain the final product, nitrobenzene. The synthesis apparatus and process of this invention achieve continuous production of nitrobenzene throughout the entire process, realizing continuous and automated operation from raw material benzene to the final product, nitrobenzene.

The application belongs to the technical field of two-dimensional materials, and relates to a method for preparing two-dimensional MXene materials through high-energy electric shock fluorinated salt etching in seconds, which comprises the following steps: 1) after grinding and mixing of a parent phase MAX powder and a fluorinated salt, the mixture is loaded into a quartz tube of a high-energy electric shock device, graphite electrodes are inserted into two ends of the quartz tube, and the material is compacted to be in close contact with the electrodes; 2) after completion of capacitor charging of the high-energy electric shock device, a discharge button is opened, high-energy electric shock is performed, the reaction is completed after flash phenomenon occurs, fluorinated salt is supplemented, and electric shock is repeated for 2-3 times; 3) the product after electric shock is ground and washed with acid, and after washing with deionized water until neutral, standing or centrifugal layering is performed, and the MXene two-dimensional material is obtained from the upper layer. Through high-energy electric shock, the reaction is completed in an instant, the comprehensive energy consumption is lower, and the etching efficiency is faster, and due to fast reaction time, high-temperature oxidation of the MXene can be effectively inhibited, and the application prospect is better.

This invention discloses a method for preparing and applying a sodium borohydride-modified self-supporting anode for AEM water electrolyzers. Firstly, an amorphous ternary metal hydroxyl oxide precursor is grown in situ on a nickel substrate via room temperature liquid phase deposition. The process involves the presence of Co in solution. 2+ Fe 3+ Ni ions are introduced through slight corrosion of the nickel foam matrix. 2+ The ions, the three, and the OH- produced by hydrolysis ⁻ Co-deposition occurs under the influence of dissolved oxygen, leading to the self-assembly of amorphous nanosheet structures on the substrate surface. Subsequently, a mild chemical reduction treatment with sodium borohydride solution is used to obtain a structurally stable and high-performance self-supporting electrode. The method described in this embodiment is mild, simple, low-cost, and has good versatility.

The embodiment of the application provides a kind of jet loop reactor, it is related to the technical field of chemical equipment, including the reactor body and the loop reactor of jet device.The reactor body is equipped with reaction liquid feed inlet, gas discharge port and reaction liquid discharge port.Jet device is longitudinally arranged along the reaction liquid feed inlet and is interconnected with each other mixing channel, contraction channel and expansion channel, mixing channel is equipped with liquid circulating feed inlet and reaction liquid nozzle, and separated liquid enters mixing channel and mixes with reaction liquid by circulating feed inlet, contraction channel gradually shrinks along the material flow direction, and expansion channel gradually expands along the flow direction, by the synergistic effect of mixing channel, contraction channel and expansion channel in jet device, combined with the double circulation flow channel formed by flow guide piece, the gas-liquid-solid three-phase mixing effect is strengthened, effectively prevent solid deposition and bubble coalescence, with the advantages of uniform mixing, high reaction efficiency and stable operation.

The invention relates to the technical field of immunization. The invention discloses parabacteroides dieldrii and parabacteroides goldsteinii, an application of the parabacteroides dieldrii and / or the parabacteroides goldsteinii in preparation of an immunopotentiator of a vaccine, and the immunopotentiator of the vaccine, and particularly discloses the parabacteroides dieldrii and the parabacteroides goldsteinii, the application of the parabacteroides dieldrii and / or the parabacteroides goldsteinii in preparation of the immunopotentiator of the vaccine. The parabacteroides dieldrii and / or the parabacteroides gold can be used as an immunopotentiator, can activate immunity, enhance antibody titer and shorten antibody generation reaction time, and can remarkably promote proliferation of B cells, plasma cells and memory B cell subgroups in a hair growth center.

The application discloses a kind of sheet bismuth-based metal organic framework materials and preparation method thereof, comprising the following steps: bismuth salt and polybasic acid organic ligand are mixed, then mixed with grinding ball, ball milling treatment, obtain bismuth-based metal organic framework material.The application prepares bismuth-based metal organic framework material with sheet morphology structure by mechanical ball milling method, by using mechanical energy in ball mill to crush reactant, promote the rapid progress of bismuth metal ion and organic ligand reaction, the whole reaction process does not need solvent, or only needs trace amount of solvent, avoid the large use of organic solvent.The application can directly promote reaction at room temperature by mechanical force, and reaction time is short, yield is high, energy consumption is low, green and environmental protection.The bismuth-based metal organic framework material has unique sheet morphology structure, high specific surface area and high structural stability and the like characteristics, and size can be controlled, can be widely used in carbon dioxide adsorption reduction, adsorption of pollutants in water and the like fields.

The utility model discloses fruit juice concentration equipment. The fruit juice concentration equipment comprises a gas transmission mechanism, a reaction mechanism and a recovery mechanism, the gas transmission mechanism is used for transmitting gas from the reaction mechanism, and the recovery mechanism is used for extracting and recovering hydrates from the reaction mechanism; the gas transmission mechanism comprises a carbon dioxide gas cylinder and a nitrogen gas cylinder; the carbon dioxide gas cylinder and the nitrogen gas cylinder are connected to one end of a gas transmission pipe; the reaction mechanism comprises a reaction kettle and a stirrer arranged in the reaction kettle; the reaction kettle is provided with a gas inlet, and the other end of the gas delivery pipe is connected to the gas inlet; the recycling mechanism comprises a water suction pump, a gas-liquid separator and a recycling bin, one end of the water suction pump is connected with the reaction kettle through a pipeline, the other end of the water suction pump is connected with the gas-liquid separator, and the recycling bin is used for recycling substances separated by the gas-liquid separator. According to the technical scheme, the production efficiency of juice extraction is improved, and the production cost is reduced.

The application provides a synthesis method of active piperidone alkaloid, and the active piperidone alkaloid is Dysidone A. The raw material piperidine is used as a substrate, and the substrate is reacted with p-methoxy benzyl chloride under the condition of N,N-diisopropylethylamine, so that the secondary amine is protected, and the side reaction of sodium hydride and hydrogen on the secondary amine is avoided. Then, the secondary amine is oxidized under the condition of iodine and iodobenzenediacetic acid. Next, the secondary amine is reacted with triethyl phosphine acetic acid ester to obtain an alpha, beta unsaturated ester. Then, the p-methoxy benzyl protection is removed by using ammonium cerium nitrate in a mild and efficient manner. Finally, the ester is reduced into an alcohol by using diisobutylaluminum hydride. The piperidone alkaloid or the like is obtained through five reaction steps. The synthesis process is simple, the raw material is cheap and easy to obtain, the cost is low, the reaction condition is relatively mild, the purity is high, and the method has good economic and social benefits.

The invention discloses an iron-carbon catalytic material based on coal gasification slag as well as a preparation method and application of the iron-carbon catalytic material, and belongs to the technical field of industrial solid waste recycling. The preparation method comprises the following steps: adding dried coal gasification slag into an oxalic acid solution for extraction to obtain a suspension A; adding a reducing agent into the suspension A, carrying out precipitation reaction, and then carrying out solid-liquid separation to obtain a solid B; and sintering the solid B to obtain the composite material. The invention further discloses the iron-carbon catalytic material based on the coal gasification slag prepared by the method and application of the iron-carbon catalytic material. According to the method, the industrial solid waste coal gasification slag is used as a carrier, endogenous iron in the coal gasification slag is converted by adopting an acid leaching-reduction precipitation-roasting method, the iron-supported catalytic material with a stable structure and excellent performance is obtained, the process is green, the cost is low, the organic wastewater treatment capacity is excellent, and the practical value is relatively good.

The present application relates to a kind of fluorine-containing dihydronaphthalenone derivative and its preparation method and application, the fluorine-containing dihydronaphthalenone derivative obtained by visible light induced phosphine catalysis difluoroacetophenone derivative and the radical addition cyclization reaction of a variety of olefins in series compared with prior art, the preparation method of the present application has the advantages of high efficiency, short reaction time, high yield, mild condition etc., its structural motif is important in pharmaceutical and agrochemical products;The synthetic method for preparing fluorine-containing dihydronaphthalenone and its derivative of the present application is completely new, and the fluorine-containing dihydronaphthalenone compound synthesized is used in various organic synthesis reactions.

The application provides an amphiphilic carbon dot, a rapid dispersion ultra-stable foam system and a preparation method thereof, and belongs to the field of oil field chemistry, wherein the preparation method of the amphiphilic carbon dot comprises the following steps: dissolving cholic acid in a first solvent to obtain a hydrophobic phase precursor solution; dissolving chitosan oligomer in a second solvent to obtain a hydrophilic phase precursor solution; mixing the hydrophobic phase precursor solution and the hydrophilic phase precursor solution in a closed reactor, standing for 5-10 min, and performing phased microwave treatment: 180-220 W for 1-3 min, 450-550 W for 2-5 min, and 80-120 W for 4-8 min; cooling the reaction liquid to room temperature, and obtaining the amphiphilic carbon dot through filtration, dialysis and freeze-drying. Through the synergistic effect of the amphiphilic carbon dot and the surfactant, the application can realize rapid dispersion to form uniform foam, and can maintain the stability of the foam in a high-salt environment for a long time, thereby meeting the application requirements in a high-salt scene.

The present application relates to a kind of preparation method of titanium carbide fiber, belong to metallurgy and hard alloy preparation technical field.The present application uses titanium hydride as titanium source, carbon nanotube as carbon source, using molten salt method, in the tube furnace of argon protection, 700~900 ℃ reaction 3~5h, prepared fibrous titanium carbide, product is removed after washing other impurities and obtains high-purity titanium carbide fiber.Sodium chloride and potassium chloride binary salt are used as molten salt medium, which can effectively reduce the reaction temperature and reduce energy consumption.The preparation method of fibrous titanium carbide proposed in the present application has the advantages of low cost, simple process, low reaction temperature, short reaction time, etc.The prepared titanium carbide powder has high crystallinity and uniform particle size distribution.The salt can also be recycled and reused, reducing the synthesis cost and facilitating industrial production.

The present invention relates to a microfluidic chip, a method, a reagent kit, and a system for detecting protein antigens. The method for detecting protein antigens includes the following steps: mixing a test sample with a reaction reagent, and forming the mixture of the test sample and the reaction reagent into a plurality of liquid droplets through microfluidic control technology, wherein the reaction reagent includes marker-labeled antibodies and an electrolyte providing agent, the marker-labeled antibodies are adapted to specifically bind to protein antigens in the test sample, forming the plurality of antigen-antibody complexes, the plurality of antigen-antibody complexes are encapsulated within the liquid droplets, and the plurality of antigen-antibody complexes are capable of undergoing agglutination reaction under an action of the electrolyte providing agent; and after the agglutination reaction, detecting and analyzing signal intensities of the liquid droplets corresponding to the agglutination reaction, thereby determining the quantity of the protein antigens in the test sample. The detection method is simple, not requiring washing steps and the plurality of rounds of sample additions, consumes a decreased amount of reagent with high reproducibility.

The invention discloses a method for synthesizing ziram. The method comprises the following steps: S1, stirring a compound surfactant and zinc oxide to obtain a dispersion liquid; s2, sealing and pressurizing, and adding dimethylamine for reaction to obtain a dimethylamine salt mixture; and S3, dropwise adding carbon disulfide, performing condensation reaction, and removing impurities to obtain the ziram, wherein the compound surfactant contains at least one of a nonionic surfactant, an anionic surfactant or a macromolecular surfactant. According to the method, the efficient and green synthesis of the ziram is realized through the synergistic effect of a compound surfactant system, a sealed pressurized reaction and a progressive charging sequence.

The invention provides aluminum fumarate and a synthesis method thereof. The synthesis method comprises the following steps: mixing organic aluminum, an organic carboxylic acid ligand and an alkaline substance in water according to a molar ratio of 1: (1.8-2.8): (1-8), and carrying out thermal reaction to obtain aluminum fumarate; wherein the organic carboxylic acid ligand is selected from one or a combination of more than two of fumaric acid, maleic acid and isophthalic acid. According to the synthesis method, organic aluminum is adopted, a large amount of heat can be released when the organic aluminum is decomposed in water, so that synthesis of aluminum fumarate is promoted, meanwhile, the decomposition process is beneficial to promotion of deprotonation of fumaric acid, reaction time is shortened, the dosage of alkaline substances is reduced, generated wastewater is closer to be neutral, cost is reduced, and the production scale is convenient to enlarge. The aluminum fumarate is of a staggered flower-shaped spherical structure, and the specific surface area of the aluminum fumarate is remarkably increased.

The application discloses a preparation method of defect-induced synthesis of porous carbon nanocomposites and application thereof in supercapacitors. The method uses DHPC as a carbon base to anchor Mn3O4. A large number of intrinsic defects on the surface of the DHPC optimize the local electron density distribution and surface performance, accelerate ion kinetics, provide abundant nucleation sites, and enhance the binding activity with Mn3O4. The microwave-assisted synthesis technology is used to realize the uniform dispersion of Mn3O4 nanoparticles on the DHPC, forming a three-dimensional porous network structure. The structure not only improves the conductivity of Mn3O4, but also promotes the rapid diffusion of electrolyte ions and electron transmission, simultaneously relieves the stress damage in the charging and discharging process, and significantly improves the electrochemical performance and cycle stability of the material. Compared with the prior art, the preparation method has the advantages of simple operation, low cost, environmental friendliness and the like.

This invention provides a rapid colorimetric reagent for the detection of manganese and iron ions. The reagent consists of carbon dots, a 3,3′,5,5′-tetramethylbenzidine solution, and a phosphate buffer solution. The reagent itself is a brown, transparent solution. When manganese ions are added to the 3,3′,5,5′-tetramethylbenzidine solution and phosphate buffer solution, it turns blue (visible to the naked eye) upon irradiation with a 365 nm UV lamp; upon contact with iron ions in the 3,3′,5,5′-tetramethylbenzidine solution, it turns dark green (visible to the naked eye). This reagent exhibits an extremely low detection limit and good selectivity. The detection process does not require complex analytical equipment, enabling rapid trace detection of manganese and iron ions. The reagent is simple to prepare, overcoming the shortcomings of cumbersome and expensive synthesis of manganese and iron ion detection probe molecules, and providing effective technical support for trace detection in food safety.

This invention belongs to the field of oil and gas field wastewater treatment technology, and discloses a treatment system and method for oil and gas field fracturing flowback fluid. The system comprises a de-gelling and flocculation system, a microbubble ozone system, a reverse osmosis interception system, and a bio-enhanced degradation system connected in sequence. The de-gelling and flocculation system receives the raw water to be treated and, through the synergistic effect of chemical de-gelling and physical swirling fields, separates and removes oily substances and suspended solids from the raw water, forming de-gelling permeate. The microbubble ozone system is used to deeply oxidize the de-gelling permeate, forming oxidation permeate. The reverse osmosis interception system is used to desalinate and deeply purify the oxidation permeate, forming reverse osmosis permeate. The bio-enhanced degradation system is used to degrade biodegradable pollutants in the reverse osmosis permeate to obtain system effluent. This invention achieves the comprehensive goal of a compact process and stable effluent that meets standards for reuse or discharge through a closed-loop treatment path of progressive pollutant reduction and differentiated purification.

The invention relates to the technical field of regenerated fiber manufacturing, in particular to a method for preparing filament fibers from waste PET (polyethylene terephthalate) materials, which comprises the following steps: raw material pretreatment, ultrasonic-assisted depolymerization, continuous polymerization and functional modification, melt direct spinning, grinding of waste yarns in a chemical fiber factory, crushing of waste PET bottles, grinding after cleaning, and obtaining of PET powder; the method comprises the following steps: mixing PET powder with ethylene glycol according to a molar ratio, generating BHET under the action of ultrasonic waves, sequentially carrying out esterification, pre-polycondensation and final polycondensation on the BHET to obtain a regenerated PET melt, adding a modified additive in the esterification reaction, spinning the regenerated PET melt by adopting a one-step process, cooling by cooling air, and winding to obtain the filament fiber. The problems that traditional regenerated PET fibers are single in raw material, complex in process and insufficient in performance are solved, low-cost and high-efficiency preparation of semi-dull, flame-retardant, cationic dyeable and other multifunctional products is achieved, and high-value utilization of waste PET is improved.

The application discloses a method for digesting and separating fluorinated aluminum by program, which comprises the following steps: placing a catalyst with metal elements supported on alumina as a carrier into a reaction container of a cluster digestion device, adding hydrochloric acid and / or nitric acid, setting a digestion program, introducing inert gas for pre-pressurization, performing primary digestion, and simultaneously starting a condensation reflux atomizer; after the program is completed, adding hydrofluoric acid, setting a digestion program, and performing secondary digestion; after the digestion is completed, entering a cooling and crystallization program, performing cooling and crystallization, and separating to obtain a sample solution to be detected and a solid; the solid is dried and calcined to obtain fluorinated aluminum crystals, and the liquid is used for detecting the content of metal elements. The method is applied to the digestion treatment of the alumina sample with metal elements supported thereon, has a large sample treatment range, complete digestion, no volatile loss of elements, and can separate AlF3 in an alpha crystal form through the program digestion of the digestion device.

The application discloses a preparation method of 2,2-di(3,3'-epoxycyclohexyl)propane, which uses a cycloalkadiene compound 2,2-di(3,3'-cyclohexenyl)propane as raw material, adopts a titanium silicalite / heteropoly acid phase transfer homogeneous catalytic system, uses hydrogen peroxide as an oxidant, catalytically synthesizes mono-epoxide and di-epoxide, and finally separates, refines and purifies the mono-epoxide (2,3-epoxycyclohexyl-2,3-cyclohexenyl)propane and the target product di-epoxide 2,2-di(3,3'-epoxycyclohexyl)propane through molecular distillation. The application no longer uses a traditional peroxycarboxylic acid process, and the obtained epoxidation product has high yield, high epoxy value, low colority and low chlorine content; meanwhile, the reaction system of the epoxide is simple, the process condition is mild, the reaction time is short, the reaction is safe and controllable, the environment is friendly, the technical and economic requirements can be met, the operation can be continuous, and the application is particularly suitable for occasions of large-scale production.

The present application belongs to the technical field of biomass pyrolysis product processing, and provides a biomass tar catalytic cracking device and product processing method, wherein the cracking device is heated by Joule heat, and comprises a biomass pyrolysis system, a tar catalytic cracking system, a bio-oil condensation system and a hydrogen-rich combustible gas collection system. The tar catalytic cracking system comprises a Joule heat cracking reactor and a photovoltaic power generation device, and the Joule heat cracking reactor comprises a cylindrical electric heating sheet, a circular aperture plate and a cracking reaction bin. The inner and outer surfaces of the cylindrical electric heating sheet are coated with a catalyst, and the cylindrical electric heating sheet is used as a heat source to directly heat the catalyst and reactants, thereby completing the adsorption and pyrolysis of the tar in one step and achieving high processing efficiency. Meanwhile, the present application collects three products, i.e. biochar, bio-oil and hydrogen-rich combustible gas, through multi-stage processing, which is helpful to realize the high-value utilization of biomass.

The utility model discloses a high temperature pipe chain reactor for PSI production, it includes pipe chain body, the top close left side place intercommunication of pipe chain body is connected with the heat conducting oil import, and the top close left side place intercommunication of pipe chain body is connected with the heat conducting oil export, the top close heat conducting oil import place intercommunication of pipe chain body is connected with the feeding valve, the bottom close left side place intercommunication of pipe chain body is connected with the circulating water import, and the top close heat conducting oil export place intercommunication of pipe chain body is connected with the circulating water export, and the transmission is provided with in the pipe chain body close left side place, and the bottom close circulating water import place intercommunication of pipe chain body is connected with PSI export. This technical scheme can realize the continuous production, and the material is moved by the pipe chain body forcedly, and the reaction is more uniform, and the raw material high temperature foaming is not feared, and the reaction time is greatly shortened, adopts the pipe chain heating, and the equipment occupies the ground more small, adopts the full closed form, and the oxygen is prevented from entering, and the product is avoided to be oxidized, and the product yield is improved.

The application discloses a recycling method of by-product cyclohexene distillation still residue, and belongs to the technical field of recycling of by-product cyclohexene distillation still residue. The still residue is analyzed by liquid chromatography-mass spectrometry, and the chlorocyclohexane in the still residue is reacted with sodium disulfide under the condition of a catalyst. After static separation, the oil phase is refined to obtain dicyclohexyl disulfide and cyclohexene, and the water phase can be recycled. The catalyst is composed of sulfonated castor oil and a phase transfer catalyst, can improve the conversion rate of chlorocyclohexane and the selectivity of dicyclohexyl disulfide, and greatly shortens the reaction time. The application can realize recycling and utilization of the still residue, avoids waste of resources and pollution to the environment, saves the chemical production cost, and meets the environmental protection concept of green chemical industry.

The application discloses a method for obtaining high-grade tin concentrate from silver separation residue, and specifically comprises the following steps: uniformly mixing silver separation residue, an additive and carbon powder according to a proportion, preparing spherical material, and obtaining roasting residue through rotary kiln roasting; grinding the obtained roasting residue into powder, using a reducing agent solution to perform tin leaching on the powdered roasting residue, obtaining leaching liquid and leaching residue, and sending the leaching residue to other valuable element recovery; adding an oxidizing agent to the obtained leaching liquid, selectively precipitating tin in the solution, and obtaining tin precipitation residue and tin precipitation liquid. The high-grade tin concentrate can be obtained after the tin precipitation residue is dried and washed. The method directly obtains the tin concentrate from the silver separation residue, and has the advantages of high grade, few impurities, simple overall process operation, small reagent consumption in the tin precipitation process, low cost, short reaction time and no need of heating.