151 results about "Carbon bisulfide" patented technology

The invention provides a low-molecular soluble chelating collector as well as a preparation method and application thereof, and belongs to the technical field of mineral processing. According to the collecting agent, low-molecular-weight ethylene glycol terephthalate serves as a precursor, and isosorbide is introduced for a copolymerization reaction; glutamic acid is introduced as a branched chain unit, and the branching degree and reaction active site density of the molecular structure are remarkably improved by utilizing the polyfunctional group characteristic of glutamic acid. A rigid ring structure and an ether bond of the isosorbide endow the medicament with good water solubility and dispersity, and invalid curling of a macromolecular chain is avoided; the introduction of glutamic acid branched chains greatly increases the number of hydroxyl groups and amino groups capable of reacting with carbon disulfide, so that each molecule carries more xanthate groups, and the adsorption stability and coverage density of the molecule on the surface of arsenopyrite are enhanced. By means of the structure, xanthate functional groups are fully exposed, multi-tooth chelation is easily conducted on the xanthate functional groups and iron and arsenic ions on the surface of arsenopyrite, a strong hydrophobic surface layer is formed, and therefore the collecting selectivity is remarkably improved.

The invention discloses an ardealite resource comprehensive utilization method and application thereof, and belongs to the technical field of ardealite resource utilization. The method comprises the following steps: S1, mixing ardealite and a reducing agent to obtain a mixture; s2, performing high-temperature decomposition treatment on the mixture in an inert atmosphere to obtain decomposed gas and a decomposed product; s3, sulfuric acid and / or carbon disulfide are / is prepared with the decomposition gas as the raw material, and the decomposition product is used for metallurgical steelmaking; according to the method, ferrous sulfide is used as a reducing agent, under the inert atmosphere, phosphogypsum is reduced into calcium oxide and calcium ferrite, generated sulfur dioxide tail gas is recycled, and comprehensive utilization of calcium and sulfur resources of phosphogypsum solid waste is achieved; the recycled sulfur dioxide can be used for preparing sulfuric acid and / or carbon disulfide, meanwhile, calcium oxide and calcium ferrite can serve as an adhesive and a slag former to be used for efficient metallurgical steelmaking, and the comprehensive utilization method for ardealite resources has a good application prospect.

The invention belongs to the technical field of coke oven gas purification treatment, and particularly discloses a method for removing hydrogen sulfide in coke oven gas through photocatalysis, generation of oxygen vacancies is promoted by adopting a synthesis concept of synergistic effect of silver doping and polyethyleneimine, polyethyleneimine provides an alkaline condition on one hand, lone electron pairs on nitrogen are coordinated with zinc on the other hand, and the hydrogen sulfide in the coke oven gas is removed through photocatalysis. The preparation method comprises the following steps: by taking H2S and polyethyleneimine as raw materials, generating abundant oxygen vacancies under the synergistic effect of the H2S and silver, preventing agglomeration of generated ZnO and increasing reaction sites by taking polyethyleneimine as a surfactant, and then promoting a cascade reaction between ZnO < 1-x > and H2S by taking abundant oxygen vacancies, so that a 1D / 3D-ZnS / ZnO heterojunction is generated in situ to further reduce recombination of photo-generated electron holes; the catalyst converts H2S into elemental sulfur through photo-induced electrons and holes, and a carbon disulfide solution is used for cleaning the catalyst to realize regeneration of the catalyst. The method provided by the invention not only improves the removal efficiency of H2S, but also reduces the operation cost and reduces environmental pollution.

The invention discloses a method for preparing viscose fiber from alkali-soaked hemicellulose, and relates to the technical field of viscose fiber production and preparation, and the method comprises the following steps: sequentially carrying out multi-stage filtration and twice nanofiltration membrane filtration on alkali liquor squeezed from slurry porridge, and separating out high-concentration hemicellulose alkali liquor; after cellulose xanthate is generated through a xanthating machine reaction, high-concentration hemicellulose alkali liquor is added into the xanthating machine to be subjected to a xanthating reaction, and hemicellulose xanthate is generated; and adding dilute alkali liquor into the xanthating machine for dissolving, and sequentially filtering, defoaming and spinning to prepare the viscose fiber. After alkali cellulose and carbon disulfide are subjected to a yellowing reaction, high-concentration hemicellulose alkali liquor is added into a yellowing machine for secondary yellowing, then two xanthate esters are dissolved with dilute alkali liquor, and subsequent filtering, defoaming and spinning procedures are performed, so that full utilization of hemicellulose is realized, and the quality and spinnability of viscose fibers are guaranteed; meanwhile, pulp unit consumption and new alkali consumption are reduced, and the production cost is saved.

The invention provides a preparation method and application of a modified PVC adsorbent for gold extraction of carbonaceous gold ore, and belongs to the technical field of organic polymer materials and resource utilization. Based on construction of a hydroxylation-xanthate esterification reaction and bifunctional adsorption sites, a series of chemical modification paths of acetate nucleophilic substitution-hydrolysis-carbon disulfide alkali treatment are established, and xanthate functional groups with high reaction activity are accurately constructed on an inert PVC framework. Sulfur atoms in xanthate groups of the modified PVC are excellent electron donors and can generate strong chemical adsorption with metal impurities or polar sites on the surface of carbon, meanwhile, Van der Waals interaction between a main chain of the modified PVC and the carbon is reserved, and unmodified PVC or single hydroxylated PVC does not have the synergism of chemical adsorption and physical adsorption, so that the modified PVC can be used for preparing the carbon-modified PVC composite material, and the carbon-modified PVC composite material can be used for preparing the carbon-modified PVC composite material. And leap-type improvement of the adsorption capacity and selectivity of organic carbonaceous in minerals is realized.

The present invention relates to the technical field of blast furnace gas desulfurization, and specifically relates to an activated carbon-based desulfurizer and a preparation method thereof. The desulfurizer is obtained by this method. This method includes pickling waste activated carbon to obtain modified activated carbon, cerium salt loading, combined loading of iron salt and vanadium salt, anti-chlorine and sulfur treatment, and calcination activation to obtain the desulfurizer. The sulfur capacity of the activated carbon-based desulfurizer prepared by the present invention can be increased to 44% - 48%, and the activation energy for sulfides can also be reduced. It can catalyze organic sulfur and inorganic sulfur at 20 - 50 °C, greatly reducing energy consumption; among them, the removal rates of carbonyl sulfide and carbon disulfide are both greater than or equal to 98%, and the removal rate of H2S is greater than or equal to 99%.

The invention relates to an efficient gas-solid reaction process and an integrated industrial system, and belongs to the technical field of gas-solid reaction in chemical production. The process flow comprises the following steps: crushing and drying coke by a pulverizing unit, preheating the coke and sulfur steam to be greater than or equal to 550 DEG C, and jointly entering a gas-solid reaction unit; and the product enters a gas-solid separation unit, is subjected to two-stage gas-solid separation at a high temperature of 450-680 DEG C and a low temperature of less than or equal to 200 DEG C, and then is The integrated industrial system based on the efficient gas-solid reaction process is applied to carbon disulfide production through a coke method, the problems of external heat supply and byproduct generation control in the reaction process of coke and sulfur are solved, and the system is simple in process chain, easy and convenient to operate, compact in structure and suitable for continuous and closed carbon disulfide production requirements through the coke method.

The present application belongs to the technical field of fine chemical industry, and relates to a recycling method of accelerator M tar. In the waste M tar produced in M production, a catalyst is added, high-temperature decomposition is carried out under nitrogen protection, and recycled raw materials aniline, carbon disulfide and intermediate benzothiazole and the like are obtained, most of which are recycled. The present application adopts common equipment and unit operations, the catalyst can be reused, and the treatment of production waste is easy to realize industrial production.

The invention discloses a preparation method of a copper foil brightener additive, and belongs to the technical field of synthesis of sulfur-containing organic matters. The preparation method mainly comprises the following steps: by taking ethanolamine hydrochloride as a starting raw material, firstly generating sulfate amino alcohol hydrosalt, then synthesizing and generating an intermediate product by taking carbon disulfide as a sulfur source, carrying out simple spin-drying treatment on the intermediate product, and directly reacting with 1, 2, 3-trimethyl-1, 3-pentanedione to obtain the 1, 2, 3-pentanedione. The target product 3-(thiazoline-2-sulfydryl) sodium propanesulfonate can be obtained by reacting 1, 3-propane sultone at normal temperature for 4 hours. The additive prepared by the method disclosed by the invention has the advantages of cheap and easily available raw materials, mild reaction conditions, high yield and the like.

The invention relates to the technical field of medicament synthesis, and particularly discloses a microreactor device for preparing liquid isopropyl xanthate, the microreactor device comprises a workbench, the top of the workbench is fixedly connected with a mixing tank through a support, and the two sides and one end of the mixing tank are communicated with feeding pipes; the end, away from the mixing tank, of the feeding pipe communicates with a discharging port of a metering pump, the bottom of the metering pump is fixedly connected with the top of the workbench, the inner wall of the mixing tank is rotationally connected with a mixing device, and the part, located below the mixing tank, of the top of the workbench is fixedly connected with a first motor. According to the microreactor device for preparing the liquid isopropyl xanthate, the mixing device is arranged, so that the mixing efficiency of isopropanol, carbon disulfide and liquid caustic soda before reaction can be improved, and the dosing mechanism is arranged, so that the mixing efficiency of isopropanol, carbon disulfide and liquid caustic soda before reaction can be improved. Therefore, the reaction efficiency of the mixed solution of isopropanol, carbon disulfide and caustic soda liquid during reaction can be improved.

The application discloses a chrysochlamys zollingeri extract functionalized viscose fiber and a preparation method and application thereof, and belongs to the technical field of functional fiber material preparation.The chrysochlamys zollingeri extract functionalized viscose fiber is formed by wet spinning process of a viscose original solution containing microcapsules, and the viscose original solution containing microcapsules is prepared by mixing a viscose original solution and chrysochlamys zollingeri extract / porous starch composite microcapsules, wherein the viscose original solution is prepared by impregnating cellulose pulp with a sodium hydroxide aqueous solution, carbon disulfide yellowing, and then dissolving and aging in a sodium hydroxide aqueous solution.The chrysochlamys zollingeri extract functionalized viscose fiber is prepared by microcapsule embedding combined with a mild spinning process, so that active ingredients of the chrysochlamys zollingeri extract are maximally retained, long-acting, stable and slow release and anti-inflammatory and soothing effects are achieved, the chrysochlamys zollingeri extract functionalized viscose fiber can be further processed into a functional fabric through a water jet process, and is suitable for high-end sanitary material fields such as infant paper diapers.

The invention relates to a heavy metal flocculant as well as a preparation method and application thereof, and the preparation method comprises the following steps: (1) dissolving a polyamine substance in alkali liquor, dropwise adding carbon disulfide, continuously reacting for 1-2 hours after dropwise adding, and crystallizing to obtain an addition product containing a dithiocarboxylic acid group; (2) preparing an aluminum hydroxide gel solution, adding acrylamide and an initiator, and carrying out polymerization reaction in an inert atmosphere to obtain a polymerization product; adding a formaldehyde solution into the product, and continuously reacting to the end to obtain a formaldehyde grafted polymerization product; and (3) adding an addition product into the formaldehyde-grafted polymerization product, adjusting the pH value to alkalescence, and keeping heating until the reaction is completed to obtain the heavy metal flocculant. The heavy metal flocculant provided by the invention can synchronously remove heavy metals and suspended solids in wastewater, and does not need to add excessive precipitants; and the synthesized flocculant does not contain a large amount of alkali and does not cause obvious change of the pH value of a water body.

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 utility model provides a production device for synthesizing TBTD in one step, which comprises a reaction kettle, a di-n-butylamine adding pipeline, a hydrogen peroxide adding pipeline, a carbon disulfide adding pipeline, a soft water adding pipeline, a carbon disulfide gas discharging pipeline and a nitrogen pipeline are arranged at the top end of the reaction kettle, and the carbon disulfide gas discharging pipeline is connected with a gas inlet of a condenser. A condensate outlet pipeline of the condenser is connected with a carbon disulfide receiving tank, a bottom outlet pipeline of the carbon disulfide receiving tank is connected with a carbon disulfide adding pipeline, and the carbon disulfide adding pipeline is further connected with a carbon disulfide transfer pump; hydrogen peroxide is adopted as an oxidizing agent, so that high-salinity wastewater discharge is reduced; the reaction liquid is washed with water for many times to remove residual alkali liquor and byproducts, water is used as a solvent to replace a traditional methanol / ethanol system, and emission of VOCs is reduced; the metering pump is used for dropwise adding materials, so that automatic sealing feeding is realized, and harm to bodies of workers is reduced; carbon disulfide is recycled for next reaction, so that the material loss is reduced, and the pollution problem in the subsequent treatment process is reduced.

The invention is suitable for the technical field of thermoelectric materials, and provides an Nd / Zr-doped high-performance BaHfS3-based thermoelectric block material and a preparation method thereof, and the preparation method comprises the following steps: weighing and mixing BaCO3, HfO2, ZrO2 or Nd2O3 raw material powder according to a target stoichiometric ratio, then placing in a muffle furnace, carrying out heat preservation for 1.8-2.2 hours at 1150-1250 DEG C, and carrying out solid-phase sintering to obtain an oxide precursor BaHf (1-x) MxO3, 0 < = x < 1; the preparation method comprises the following steps: by taking BaHf (1-x) MxO3 as a raw material and carbon disulfide as a sulfur source, carrying out anion replacement on BaHf (1-x) MxO3 under the conditions that the temperature is 950-1050 DEG C and the temperature is kept for 2-12 hours, and converting oxide into sulfide, so as to obtain BaHf (1-x) And after the BaHf < 1-x > MxS3 powder is subjected to cold press molding, rapid sintering is carried out, the sintering condition is 1550-1650 DEG C, heat preservation is carried out for 5 minutes, and a target block material is obtained. The BaHfS3-based block material with a high thermoelectric figure of merit is obtained through an innovative material component design and an adaptive preparation process, BaHfS3 is introduced into the thermoelectric field, the BaHfS3-based block material has initiative in the thermoelectric application aspect of Hf-based sulfide perovskite, and the application potential of BaHfS3 in the thermoelectric conversion field is disclosed.

The present invention discloses a method for synthesizing dithiocyclic carbonates, belonging to the technical field of organic catalysis. By using a brand-new organic neutral catalyst, the [3+2] cycloaddition reaction of epoxides and carbon disulfide can be achieved at room temperature within a short time, and dithiocyclic carbonates can be obtained with high selectivity. This catalytic system has excellent catalytic effects on different aliphatic and aromatic epoxides, and the yields of most of them reach over 90%. The dithiocyclic carbonate products have no metal residues and have great potential for commercial applications in fields such as biomedicine and polymer production where strict requirements are imposed on the content of metal residues.

Processes for removing carbon disulfide from product streams containing a sulfide compound are performed by contacting the product stream with an aqueous solution comprising a mercaptide to form a mixture, or by contacting the product stream with an aqueous solution comprising a mercaptan and a base to form a mixture. An aqueous layer is removed from the mixture, resulting in a high purity sulfide stream with significantly less carbon disulfide.

The invention relates to the technical field of metal die heat treatment, and provides a hammer forging die heat treatment method which comprises the following steps that after a blank is forged, spheroidizing annealing pretreatment is conducted, the toughness of a die is improved, and then rough machining is conducted; the mold is placed in a quenching furnace, nitrogen is introduced, and segmented heating quenching is carried out; after the mold is quenched and discharged, tempering is conducted twice, and finish machining is conducted through a numerical control grinding machine; and carrying out gas tufftriding treatment to further improve the wear resistance of the surface of the mold, and finally grinding and polishing. The risks of quenching deformation and cracking are reduced through spheroidizing annealing pretreatment, austenite is homogenized through segmented heating quenching, the thickness of a permeation layer is increased by introducing carbon disulfide during tempering, the surface abrasion resistance is improved through tufftriding treatment, the four improvement points are combined, the impact resistance of the mold is remarkably improved, energy consumption is reduced, and the service life of the mold is prolonged. And an economic and efficient industrial solution is provided.

The invention discloses a continuous reaction system and method for co-producing solid and liquid sodium ethyl xanthate, and relates to the technical field of sodium ethyl xanthate production. The system comprises a reaction kettle, a stirring motor, a raw material discharging pipe, an alkali liquor discharging pipe, a discharging pipe, a circulating liquid outlet pipeline, a centrifugal machine, a drying machine, a xanthate storage tank, a plurality of groups of control valves and a plurality of groups of backflow pipelines, which form a closed-loop reaction and separation system. The method comprises the following steps: feeding ethanol, carbon disulfide and caustic soda liquid with the concentration of more than or equal to 40% according to a molar ratio of 1: (0.9-1.2): (1.0-1.2), carrying out an initial reaction at 30-36 DEG C for 2.5-4.5 h, carrying out circulating separation, mother liquor recycling and continuous alkali supplementation to realize continuous production, and simultaneously producing liquid sodium ethyl xanthate and solid xanthate obtained by drying at 40-60 DEG C for 0.5-2.5 h. According to the method, reaction balance is promoted through high-concentration alkali, the raw material conversion rate is increased, the problem of solid precipitation is solved through the process of reaction-separation-recycling, product diversification is achieved, batch reaction is upgraded to continuous production, the productivity and stability are improved, and different market requirements are met.

The invention discloses a 9H-carbazole-9-yl pyrrolidine-1-dithioic acid ester compound and a preparation method thereof.According to the method, an N-heterocyclic compound, carbon disulfide and pyrrolidine serve as raw materials, and the 9H-carbazole-9-yl pyrrolidine-1-dithioic acid ester compound is prepared through an electrochemical oxidation reaction in the presence of electrolyte. A transition metal catalyst and a chemical oxidizing agent are not needed in the reaction process, electrons are adopted as a clean redox reagent, the method has the advantages of being mild in reaction condition, high in regioselectivity, environmentally friendly and the like, and a new way is provided for green synthesis of the medical intermediate 9H-carbazole-9-yl pyrrolidine-1-dithioate compound.

The present invention relates to the technical field of organic synthesis, and in particular to a method for synthesizing dithiocarbamate derivatives. The method comprises the following steps: mixing a compound represented by Formula I, an alcohol reagent, carbon disulfide, and a compound represented by Formula II to obtain a mixture; and reacting the resulting mixture at a temperature of 20 to 30°C for 5 hours to obtain the dithiocarbamate derivative. The method for synthesizing the dithiocarbamate derivative does not require an oxidant or a metal catalyst, can react at room temperature, is environmentally friendly, has high reaction tolerance, and provides a good yield.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a synthesis method of dimercaptothiadiazole and a dimer thereof, which comprises the following steps: dissolving 10-15kg of thiocarbazide in an alkaline composite solvent, stirring until the thiocarbazide is completely dissolved, controlling the temperature at 5 DEG C, slowly dropwise adding 8-16.5 L of carbon disulfide, heating to 25 DEG C after dropwise adding, stirring to react for 6 hours, and carrying out reduced pressure distillation to obtain a crude product; adding the dimercaptothiadiazole crude product into 50 DEG C methyl isobutyl ketone according to a solid-liquid mass ratio of 1: 4, stirring until the dimercaptothiadiazole crude product is completely dissolved, dropwise adding absolute ethyl alcohol which is 1.5 times of the volume of the methyl isobutyl ketone, cooling to 0 DEG C, preserving heat for 1 hour, and collecting separated solids; and washing the solid collected by suction filtration with 0 DEG C cold absolute ethyl alcohol, and carrying out vacuum drying to obtain the dimercaptothiadiazole. According to the invention, the process route is optimized, the use of concentrated sulfuric acid and diluted hydrochloric acid is avoided during synthesis, and the subsequent treatment cost of the environment-friendly acidic wastewater is reduced.

This application relates to the field of modal fiber, specifically a preparation process for a modal fiber with ultra-high wet modulus variation. The relevant process parameters are set as follows: the degree of polymerization of alkalized cellulose after aging is 350-750; the weight percentage of carbon disulfide added to methyl cellulose is 36-48%; the viscose aging degree is 10-16 mL (10% NH4Cl); in the spinning coagulation bath, the sulfuric acid concentration is 65-105 g / L, the sodium sulfate concentration is 105-210 g / L, the zinc sulfate concentration is 45-85%, and the coagulation bath temperature is 20-55℃; the fiber draw ratio is 90-120%. This process has the advantage of further improving the wet modulus of the modified modal fiber while ensuring high fiber hook strength.

The utility model discloses a tetraethylthiuram disulfide production reaction device which comprises a reaction kettle, a stirring structure is arranged in the reaction kettle, a jacket is arranged outside the reaction kettle, and an ethanol solution adding pipeline, a diethylamine adding pipeline, a hydrogen peroxide adding pipeline and a carbon disulfide adding pipeline are arranged at the top end of the reaction kettle. The ethanol solution adding pipeline is connected with a liquid outlet of the ethanol solution static mixer, an ethanol inlet pipeline and a soft water inlet pipeline are arranged on the ethanol solution static mixer, and the carbon disulfide gas discharging pipeline is connected with a gas inlet of the condenser; a condensate outlet pipeline of the condenser is connected with a carbon disulfide receiving tank, a bottom outlet pipeline of the carbon disulfide receiving tank is connected with a carbon disulfide adding pipeline, the carbon disulfide adding pipeline is further connected with a carbon disulfide transfer pump, and a carbon disulfide metering pump is arranged on the carbon disulfide adding pipeline. One-step safe production of tetraethylthiuram disulfide can be realized, and the production efficiency is improved.

The invention relates to the technical field of gas purification and chemical catalysts, and discloses a preparation method and application of a carbon-based sulfur hydrolysis catalyst, and the preparation method comprises the following steps: preparing the carbon-based sulfur hydrolysis catalyst from sulfolane, monopropanolamine, tripropanolamine and water through temperature-controlled mutual dissolution and precise filtration; the application method of the carbon-based sulfur hydrolysis catalyst comprises the following steps: spraying the carbon-based sulfur hydrolysis catalyst into an absorption tower, and constructing a double-temperature area in the absorption tower; maintaining high temperature in the lower area of the absorption tower, and catalyzing carbon disulfide and carbon sulfide to hydrolyze by utilizing monopropanolamine; the upper area of the absorption tower is kept at low temperature, tripropanolamine is used for absorbing hydrogen sulfide and carbon dioxide, the carbon-based sulfur hydrolysis catalyst absorbing gas is conveyed to a desorption tower, hydrogen sulfide and carbon dioxide are desorbed through high temperature and negative pressure to serve as product gas, and a regenerated solution is recycled. The method provided by the invention solves the contradiction between carbon disulfide hydrolysis and product absorption, and realizes conversion and resource recovery of organic sulfur.

The invention discloses a preparation method and a modification method of an aromatic polythiourea compound. The preparation method comprises the following steps: carrying out polymerization reaction on carbon disulfide and a multi-element aromatic amine compound in dimethyl sulfoxide to obtain an aromatic polythiourea compound; according to the invention, an aromatic polythiourea compound and ninhydrin are subjected to a reaction in an organic solvent, such that the indanone and thiourea compound is obtained. The aromatic polythiourea compound and the polyindanone thiourea compound prepared by the invention have outstanding optical properties, luminescence properties, tensile properties and the like; the preparation method has the advantages of cheap and easily available reaction raw materials, low raw material price, simple synthesis, high polymerization efficiency and the like.

The invention relates to the technical field of carbon nanotubes, and discloses a preparation method of a high-adsorbability carbon nanotube material, which comprises the following steps: reacting imidazole-4-ethyl formate with succinyl chloride under the catalysis of triethylamine to obtain an intermediate 1, and reacting the intermediate 1 with hydrazine hydrate to obtain an intermediate 2; and reacting the intermediate 2 with carbon disulfide to obtain the bis-imidazole diacyl thiocarbamate compound. Enabling the acidified carbon nano tube to react with 3-chloropropyl triethoxy silane, so as to obtain the chloropropyl carbon nano tube. And finally, carrying out quaternization reaction on the chloropropyl carbon nano tube and a bis-imidazole diacyl thiocarbamate compound, so as to obtain the high-adsorbability carbon nano tube material. The carbon nanotube material prepared by the method has efficient adsorbability on metal elements and organic pollutants.

The invention discloses a method for preparing tetraethylthiuram disulfide through combined catalysis of a metal catalyst and solid alkali, and belongs to the technical field of organic synthesis. The method comprises the following steps: filling a continuous flow fixed bed with molybdenum disulfide and calcium hydroxide to form a composite multi-catalyst, preparing a reaction raw material solution from carbon disulfide and diethylamine as raw materials, controlling the flow of the reaction raw material solution and the flow of gas entering a reactor, and carrying out a temperature-controlled and pressure-controlled reaction to obtain a reaction solution; and carrying out post-treatment on the reaction liquid to obtain tetraethylthiuram disulfide. Molybdenum disulfide and calcium hydroxide are adopted to form a composite multi-term catalyst, a heterogeneous catalysis reaction is accurately controlled, the tetraethylthiuram disulfide crystal is obtained only through crystallization, filtration and drying of a prepared crude product, the purity and yield of the obtained tetraethylthiuram disulfide are high, and the method is environmentally friendly, high in atom economy and suitable for industrial production. Conditions are mild, the catalyst can be recycled, and products are easy to separate.

The application belongs to the field of olefin polymerization, and particularly relates to a cobalt-based catalyst and a preparation method of polybutadiene composite rich in 1,2-structure. The cobalt-based catalyst contains components A, B, C and D which are independently stored, the component A is a cobalt compound, the component B is an organic aluminum compound, the component C is carbon disulfide, and the component D is a silicon-containing compound. In the cobalt-based catalyst, the catalyst activity, the 1,2-addition directional selectivity and the 1,2-structure content in polybutadiene can be greatly improved by introducing the compound containing silicon-oxygen bond and the synergistic effect of the above components, the crystallization performance is improved to realize in-situ synthesis of polybutadiene composite material rich in 1,2-structure and silicon dioxide, and the production efficiency and product performance are improved.

The present invention discloses a preparation method of a silicon-carbon composite material and a silicon-carbon composite material. The preparation method includes: preparing a porous carbon-doped porous copper complex, and depositing nano-silicon on the porous carbon-doped porous copper complex according to a silane pyrolysis method, to obtain the silicon-carbon composite material. The preparation of the porous carbon-doped porous copper complex includes at least operation steps of: S11). uniformly mixing carbon disulfide, activated carbon, and a binder, and pressing an obtained mixture into copper foam to form a sheet-like structure; and S12). transferring the sheet-like structure obtained in the step S11) to a carbonization apparatus, and performing heating and carbonization in an inert atmosphere to obtain the porous carbon-doped porous copper complex. In the present invention, the following obvious defects and problems are significantly alleviated: The nano-silicon cannot be completely deposited in porous carbon when only pure porous carbon is used as a substrate for depositing the nano-silicon, thus affecting expansion and high-temperature preservation performance of the silicon-carbon composite material due to exposure of the nano-silicon; and the use of a pure porous metal for depositing the nano-silicon leads to poor consistency and low efficiency.