183 results about "Carbon bisulfide" patented technology

The invention discloses an antibacterial and deodorant blended fabric, a preparation method thereof and application of the antibacterial and deodorant blended fabric in underwear, and relates to the technical field of fabrics. When the antibacterial and deodorant blended fabric is prepared, firstly, indolyl polyester is subjected to melt spinning to be prepared into fibers; the preparation method comprises the following steps: reacting fibers, indole and indole-6-formaldehyde, reacting with 4-(aminomethyl)-2, 6-di-tert-butylphenol, and reducing to obtain modified polyester fibers; secondly, the pretreated bamboo fibers react with carbon disulfide and potassium hydroxide; the preparation method comprises the following steps: oxidizing a modified bamboo fiber precursor obtained by reacting the modified bamboo fiber with 1-(2-propenyl)-1, 3, 5-triazine-2, 4, 6 (1H, 3H, 5H)-triketone to obtain a modified bamboo fiber, and oxidizing the modified bamboo fiber precursor to obtain the modified bamboo fiber; the modified polyester fibers and the modified bamboo fibers are blended and woven to obtain fabric, and then the fabric is finished through a finishing agent to obtain the antibacterial and deodorant blended fabric. The antibacterial and deodorant blended fabric prepared by the invention has good antistatic, antibacterial and durable properties.

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 belongs to the technical field of insecticides, and particularly relates to a synthetic method of a hexythiazox intermediate, which comprises the following four steps: S1, preparing erythro-1-p-chlorophenyl-2-amino-1-bromo-propane; s2, preparation of the erythro-1-p-chlorophenyl-2-aminopropanethiol, and preparation of the erythro-1-p-chlorophenyl-2-aminopropanethiol; s3, preparation of the trans-1-p-chlorophenyl-2-amino-propyl-O-isopropyl thiocarbonate hydrochloride, and preparation of the trans-1-p-chlorophenyl-2-amino-propyl-O-isopropyl thiocarbonate hydrochloride; and S4, preparation of a hexythiazox intermediate, namely, trans-5-(4-chlorphenyl)-4-methyl thiazolidone. According to the invention, the use of highly toxic carbon disulfide, corrosive chlorosulfonic acid, carcinogenic benzyl chloride and other high-risk reagents is completely abandoned, the operation risk is reduced, no malodorous gas is discharged, the occupational health and safety of operators and the environment are fundamentally guaranteed, meanwhile, the generation of acidic wastewater and sulfur-containing hazardous waste is solved, and the production cost is reduced. And a green chemical atom economy principle is met.

The invention discloses a high-strength energetic compound based on a polydopamine and thiourea polymer and a preparation method of the high-strength energetic compound, and the energetic compound is composed of energetic crystal 1, 3, 5-triamino-2, 4, 6-trinitrobenzene, the polydopamine and the thiourea polymer. The preparation method comprises the following steps: modifying an energetic crystal 1, 3, 5-triamino-2, 4, 6-trinitrobenzene through polydopamine in advance; the polythiourea is obtained through reaction of 2, 2 '-(ethylene dioxygen) diethylamine, carbon disulfide and trimethylolpropane tripolypropylene glycol ether, and the addition amount is 2.5 wt.%-10 wt.%; and mixing the two components by a kneading method, and drying to obtain the energetic compound. The obtained compound has the characteristics of strengthening and toughening, the Brazil mechanical strength reaches 14.76 MPa, and the fracture strain reaches 0.474%. By introducing polyphenol polydopamine and polythiourea to achieve a synergistic effect, the mechanical property of the explosive is greatly improved, and a technical support can be provided for the application of the explosive; meanwhile, the preparation method is simple, mild in reaction condition and easy for large-scale production.

The invention discloses a Schiff base catalyst for copolymerization of epoxide and carbon disulfide, and relates to the technical field of Schiff base catalysts. The invention provides a structural general formula of the Schiff base catalyst and a specific structural formula in 6, and also provides a preparation method of the Schiff base catalyst. Different numbers of methyl, fluorine and other functional groups are introduced to improve the selectivity of the catalyst to the reaction.

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 a preparation method of alkyl naphthalene and a modified ionic liquid catalyst used in the preparation method. The modified ionic liquid catalyst is obtained by modifying ionic liquid Et3NHCl-AlCl3, Et3NHCl-FeCl3 or Et3NHCl-ZnCl2 with carbon disulfide. The preparation method of the alkyl naphthalene comprises the following steps: enabling naphthalene, cyclopentene and alpha-olefin to react under the action of the modified ionic liquid catalyst in the claim 1, and then performing post-treatment to obtain an alkyl naphthalene product. The carbon disulfide is used for modifying the ionic liquid Et3NHCl-AlCl3, Et3NHCl-FeCl3 or Et3NHCl-ZnCl2, the Lewis acidity of the modified ionic liquid is reduced, and when the modified ionic liquid is used for alkylation reaction of naphthalene, cyclopentene and alpha-olefin, side reactions such as disproportionation can be reduced, and the conversion rate of naphthalene is increased. In addition, the modified ionic liquid catalyst is easier to separate from a reaction mixture, and purification of a target product is facilitated.

The invention relates to the technical field of blast furnace gas desulfurization, in particular to an activated carbon-based desulfurizer and a preparation method thereof. The desulfurizer is prepared by the method. The method comprises the steps of acid pickling treatment of waste activated carbon to obtain modified activated carbon, cerium salt loading, ferric salt and vanadium salt combined loading, chlorine-resistant hydrophobic treatment and roasting activation, and the desulfurizer is obtained. The sulfur capacity of the prepared activated carbon-based desulfurizing agent can be increased to 44%-48%, the activation energy on sulfides can be reduced, organic sulfur and inorganic sulfur can be catalyzed at the temperature of 20-50 DEG C, and energy consumption is greatly reduced; wherein the removal rates of carbonyl sulfide and carbon disulfide are both greater than or equal to 98%, and the removal rates of H2S are both 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 a novel viscose fiber spinning method, and relates to the technical field of viscose fibers. The non-acidic coagulating bath is mainly composed of at least one of sodium salts. The viscose stock solution does not release hydrogen sulfide and carbon disulfide during non-acid coagulating bath spinning forming, spinning station workers and the atmospheric environment are friendly, sodium bicarbonate consumed by fiber forming can be prepared by reacting carbon dioxide with sodium carbonate, the production cost of chemical raw materials is low, the byproduct sodium carbonate generated in a coagulating bath is higher in economic value, and the production cost is low. And the fibers are uniformly formed, the orientation degree is higher, and the dimensional stability is better.

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 an oil-soluble thick oil viscosity reducer as well as a preparation method and application thereof. The invention relates to an oil-soluble thick oil viscosity reducer, which consists of an alkenyl ester copolymer and a fatty acid ester surfactant in a mass ratio of 100: (0.5-50). The preparation method of the oil-soluble thick oil viscosity reducer comprises the following steps: step 1, preparing a mixed solution; 2, discharging air in the reactor, continuously introducing nitrogen or inert gas, dropwise adding 2-4 parts of carbon disulfide into the mixed solution, and stirring after dropwise adding to obtain an oily solution; step 3, heating the oily solution to 60-75 DEG C, heating the oily solution to 90-105 DEG C for reflux, and performing reduced pressure distillation to obtain distillation residues; step 4, heating the distillation residues under the condition of 110-150 DEG C, and naturally cooling to obtain an intermediate; and step 5, uniformly mixing the intermediate with a fatty acid ester surfactant according to a mass ratio of 100: (0.5-50) to obtain the oil-soluble thick oil viscosity reducer.

The invention relates to the technical field of viscose staple fiber processing, in particular to a viscose staple fiber cooking device which comprises a fiber feeding groove frame, a dispersing groove and a cooking groove are formed above the fiber feeding groove frame, the connecting position of the dispersing groove and the cooking groove is through, a dispersing guide plate and a distribution assembly are arranged in the dispersing groove, and the dispersing guide plate is connected with the cooking groove. The device has the beneficial effects that the dispersing tank and the cooking tank are designed, viscose staple fibers are cooked through steam, the fibers are carded in the cooking process in cooperation with the fixing frame, meanwhile, the broken staple fibers are intercepted, blockage and accumulation are avoided, the fibers can be fully cooked and loosened through sprayed steam, residual CS2 is fully cooked and removed, and the quality of the viscose staple fibers is improved. And the space above the cooking tank is covered by the steam rising area sealing cover, and rising steam carrying carbon disulfide can be connected with a condensation recovery separation workshop through a carbon disulfide recovery pipe, so that the carbon disulfide is effectively recovered, the environmental pollution is reduced, and the resource utilization rate is improved.

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 belongs to the technical field of precious metal recovery, and particularly relates to a high-adsorption-capacity precious metal adsorbent and a preparation method and application thereof. The invention provides a high-adsorption-capacity precious metal adsorbent. The high-adsorption-capacity precious metal adsorbent is prepared by crosslinking polyethyleneimine and carbon disulfide, the high-adsorption-capacity precious metal adsorbent is insoluble in water and has a porous structure. The adsorbent disclosed by the invention has relatively high adsorption capacity on trivalent gold ions and divalent palladium ions at the same time; meanwhile, the adsorbent has excellent adsorption selectivity on trivalent gold ions and divalent palladium ions. The adsorbent disclosed by the invention can be recycled after desorption, and is a saving type material; and the preparation method is simple, mild in synthesis condition, low in raw material cost and easy to industrialize.

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.

The invention belongs to the technical field of organic synthesis, and particularly discloses a synthesis method of a 2-mercaptobenzothiazole derivative. The preparation method comprises the following steps: by taking salicylic acid which is cheap and easy to obtain as a raw material, carrying out Curtius rearrangement and intermediate hydrolysis to obtain ortho-aminophenol, and then selectively converting the obtained ortho-aminophenol into ortho-aminophenyl phenol trifluoromethanesulfonate; and finally, carrying out ring closing on the 2-mercaptobenzothiazole and potassium ethyl xanthate under a heating reflux condition to obtain the 2-mercaptobenzothiazole. The method has the advantages of mild reaction conditions, wide raw material sources, no need of high-toxicity sulfur-containing intermediates such as carbon disulfide or thiophosgene, and no need of an oxidant in the post-treatment process.

The invention belongs to the technical field of flotation collectors, and relates to a high-purity xanthate flotation collector and a preparation method and application thereof. The preparation method comprises the following steps: by taking excessive alcohol as a reaction raw material and a solvent, adding methylbenzene and dichloromethane as auxiliary solvents, then adding caustic alkali and carbon disulfide, and fully stirring and reacting in a reaction kettle; part of the solvent is removed through first ternary azeotropy, and then generated moisture is removed through second ternary azeotropy; and the high-purity xanthate flotation collecting agent is prepared and obtained through ultrasonic induced crystallization. The method provided by the invention has the technical advantages of high safety, mild reaction, few side reactions, convenience in operation and the like, and the xanthogenate prepared by the method has the characteristics of high purity and small taste, and has a remarkable industrialization prospect.

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 discloses a star-shaped block copolymer for low-rank coal slurry and a preparation method thereof. The method comprises the following steps: uniformly mixing tripotassium phosphate, 1-butyl mercaptan, carbon disulfide and acetone, heating the mixture to room temperature and keeping the temperature, adding 1,3,5-tri(bromomethyl)benzene at 5 to 0°C, stirring the mixture, heating the mixture to room temperature and keeping the temperature, separating the product to obtain an intermediate product I; subjecting the intermediate product I, an initiator, styrene and dioxane to a RAFT controlled radical polymerization reaction under vacuum, and then removing unreacted monomers to obtain M n =10000-20000 intermediate product II; the intermediate product II, initiator, methoxy polyethylene glycol acrylate and dioxane are subjected to RAFT controlled radical polymerization under vacuum, and then the unreacted monomer is removed to obtain M n = Star-shaped block copolymer with a molecular weight of 20,000 to 40,000.