104 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 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 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 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 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 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 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.

The application provides a polyxanthate compound and a preparation method thereof, and relates to the technical field of organic polymer synthesis. The application adds a dihydric alcohol compound, alkali and carbon disulfide into an organic solvent, and stirs and reacts; a dihalogenated compound is added into the foregoing reaction system for reaction, stirring, precipitation, drying, and thus a polyxanthate compound is obtained. The application has the characteristics of mild reaction conditions, simple operation, and easily available raw materials, and the obtained polyxanthate compound has excellent solubility, thermal stability, ultraviolet resistance and refractive performance.

A trickle bed reactor for synthesizing perchloromethyl mercaptan relates to the technical field of synthesis devices and comprises a tank body, a plurality of distributors and fillers are arranged in the tank body from top to bottom in parallel, the top of the tank body is connected with a carbon disulfide inlet pipeline, the bottom of the tank body is connected with a chlorine inlet pipeline, and the top of the tank body is further connected with a heat exchanger. The outlet end of the heat exchanger is connected with a carbon disulfide receiving tank, and the outlet end of the carbon disulfide receiving tank is connected to the carbon disulfide inlet pipeline through a backflow pipeline. The utility model solves the problems that the device in the traditional technology is not timely in heat transfer, the traditional device controls the reaction temperature by controlling the feeding rate, the efficiency is low and certain instability exists in a certain range, and the selectivity is reduced if the heat transfer in the reaction is not timely.

The invention discloses an efficient, safe and environment-friendly method for continuous flow synthesis of 6, 8-cyclotrithioctic acid. According to the method, lipoic acid and sulfur are used as raw materials, carbon disulfide is used as a solvent, and the two solutions are continuously fed into a microchannel or a tubular reactor in proportion through a precise feeding pump and are subjected to cyclization reaction at the low temperature of 30-45 DEG C; and after the reaction is finished, distilling effluent to recover the solvent, and purifying and crystallizing the obtained product in a manner of redissolving the obtained product in a benign solvent (such as ethanol and methanol) and separating out a poor solvent (such as petroleum ether and water). According to the invention, accurate control of reaction temperature, time and material proportion is realized by utilizing a continuous flow technology, and the problems of hydrogen sulfide gas generation, high temperature and high pressure, multi-step complex purification and the like in a traditional intermittent kettle type process are thoroughly avoided. The method has the advantages of simplicity and convenience in operation, high safety, high purity (up to 99.5%), recoverable solvent, less three wastes and the like.

The invention relates to the field of biological medicines, in particular to a sea cucumber peptide for promoting male function improvement and a preparation method thereof. The modified sea cucumber peptide is combined with dynamic reversible crosslinking through a click chemical reaction, the sea cucumber peptide and azide small molecules are subjected to covalent binding under catalysis of copper sulfate, then a stable crosslinking network is formed through crosslinking of carbon disulfide, and the stability and biological activity of the modified sea cucumber peptide are improved. The modified sea cucumber peptide has a remarkable effect in the aspect of improving male functions. The invention further provides a preparation method for mixing the modified sea cucumber peptide with 4-ethyl-2-fluoroaniline, sodium acetate, glycerol and propylene glycol, and the biological activity of the sea cucumber peptide is further improved. The modified sea cucumber peptide has good thermal responsiveness, adhesion, hemostasis and biodegradability, has a good effect on improvement of male physiological functions, and is suitable for treatment and health care in the fields related to male function improvement.

The invention belongs to the field of high polymer materials, and particularly relates to a cellulose-based thermoplastic elastomer with ultraviolet absorption performance and a preparation method thereof.The preparation method comprises the following steps that cellulose and 2-bromoisobutyryl bromide react in ionic liquid, and brominated cellulose is obtained; in the presence of triethylamine, lauryl mercaptan and carbon disulfide, brominated cellulose reacts in a solvent dimethyl sulfoxide to obtain the cellulose macroinitiator. The preparation method comprises the following steps: under the action of a catalyst azodiisobutyronitrile, carrying out reversible addition-fragmentation chain transfer polymerization reaction on a cellulose macromolecular chain transfer agent, an ethylhexyl acrylate monomer and an acrylic acid vanillin monomer in a solvent N, N-dimethylformamide to obtain cellulose-g-(ethylhexyl acrylate copolymerized acrylic acid vanillin); according to the invention, cellulose is used as a main chain, and a copolymer (namely poly (ethylhexyl acrylate-co-acrylic acid vanillin)) side chain is grafted, so that the obtained elastomer has excellent elasticity and strength performance. Meanwhile, the material has a certain ultraviolet absorption function, so that the material has certain application potential in the field of delaying light aging, color fading and yellowing functions.

The application discloses a preparation method and application of a dithio-carbamate compound / polypolydithio-carbamate compound. The dithio-carbamate compound / polypolydithio-carbamate compound is obtained by reacting an amine compound, an isonitrile compound, carbon disulfide and a mercaptan compound in an organic solvent in the presence of a base. The raw materials used in the application are all industrial raw materials, which can be directly purchased and have low cost, and can be produced in a large scale of gram grade. The polymerization operation is simple, the yield is high, the reaction condition is mild, no metal catalyst is needed, the reaction can be carried out at room temperature and in the air, and no toxic and harmful by-products are generated. The polypolydithio-carbamate compound obtained by the application also has excellent mechanical properties and luminescent properties, and can be applied to the fields of mechanical materials and optoelectronic devices, thereby promoting the further development of the polypolydithio-carbamate compound.

This invention provides a system and method for preparing sodium ethyl xanthate based on microchannel technology, belonging to the field of chemical synthesis technology. The system includes a storage tank, a metering pump, a mixing pump, a microchannel reactor, a concentration vessel, a condenser, a centrifuge, and a dryer. The method includes: mixing carbon disulfide, ethanol, and liquid alkali in a predetermined ratio via the mixing pump, then feeding the mixture into the microchannel reactor; reacting under controlled temperature and residence time conditions to generate a sodium ethyl xanthate solution; concentrating the solution by vacuum distillation in the concentration vessel; centrifuging to separate the solid product; and drying to obtain the final product. This invention improves reaction efficiency and product purity by precisely controlling reaction conditions and equipment coordination, reducing side reactions and byproduct formation, and lowering the hazards and environmental pollution of the production process. It has the advantages of high efficiency, safety, and environmental friendliness, providing an efficient solution for the industrial continuous production of sodium ethyl xanthate, and is suitable for wide application in fields such as mineral processing reagents.

The invention belongs to the field of construction of DEL libraries, and particularly relates to a method for preparing an On-DNA 2-hydroxydithiocarbamate structure compound. Comprising the step of reacting On-DNA secondary amine with carbon disulfide and an epoxy compound at a certain temperature and under a solvent condition to generate an On-DNA 2-hydroxydithiocarbamate structure compound. According to the preparation method disclosed by the invention, tens of thousands of compounds with On-DNA dithiocarbamate structures can be rapidly synthesized, the chemical space of On-DNA is enriched, and the diversity of On-DNA compounds is increased. In the field of new drug research and development, the high-throughput screening hit rate of biological targets can be improved, and the discovery efficiency and possibility of lead compounds are remarkably improved.

A method for preparing diisopropyl xanthate, a solid base catalyst is filled into a fixed bed reactor after being immobilized with molybdenum disulfide, a mixed solution of isopropyl alcohol, carbon disulfide and an organic solvent is injected into a micro-mixer through a feeding pump at the same time with oxygen or air, the gas-liquid mixture is fully mixed and then enters the fixed bed for heterogeneous catalytic oxidation reaction. The solid base-immobilized composite catalyst has long service life and good stability; the composite base catalyst can provide an alkaline environment to promote the formation of intermediates and avoid the generation of high-salt wastewater; a micro-mixer is added at the front end of the fixed bed reactor to realize the full mixing of gas-liquid, so that the gas-liquid heterogeneous catalytic oxidation reaction can be continuously carried out with high efficiency and high selectivity; oxygen or air which is cheap and easy to obtain is used as the oxidant, and the by-product is water, basically without three wastes.