145 results about "Dimethyl sulfide" patented technology

The invention relates to the technical field of environmental science, in particular to a box-type model-based inversion method for methane sulfonic acid particles in marine droplet aerosol, which comprises the following steps of: 1, acquiring satellite remote sensing data, ground observation data and laboratory simulation data, and carrying out data standardization processing; 2, dividing the target sea area into a plurality of sub-areas as independent box bodies; 3, calculating the discharge flux of the marine droplet aerosol based on the dimethyl sulfide concentration and the wind speed, and updating the spatial and temporal distribution of the discharge source; 4, embedding a chemical reaction path for oxidizing dimethyl sulfide on the surface of the aerosol into the box-type model to generate methanesulfonic acid, and introducing the specific surface area of the aerosol to correct the reaction rate; and step 5, outputting spatio-temporal distribution of the concentration of the methane sulfonic acid, and comparing measured data for verification. The accuracy of aerosol source item estimation is improved, the fusion efficiency of multi-source data is improved, and the adaptive capacity of the model in a complex environment is enhanced.

The invention discloses a synthesis method of 7-dehydrocholesterol and derivatives thereof, which comprises the following steps: cooling a compound (I), cuprous bromide and dimethyl sulfide compound under the protection of inert gas to obtain a reaction system, adding a Grignard reagent (II) or a Grignard reagent (III), stirring, reacting at room temperature, carrying out heating reaction, and cooling to obtain the 7-dehydrocholesterol. Performing post-treatment to obtain a product; if the product is the Grignard reagent (II), the product is 7-dehydrocholesterol and the derivative thereof; if the reagent is the Grignard reagent (III), the product is 25-hydroxy-7-dehydrocholesterol and the derivative thereof. The method is high in total yield, mild in reaction condition, simple in process route, high in product purity, low in three-waste generation amount, simple in post-treatment, environment-friendly and low in equipment requirement, the purity of 95% or above can be obtained through simple recrystallization, and conventional chemical equipment can be used for production.

The invention relates to the technical field of tetramethyltin synthesis, in particular to a high-efficiency tetramethyltin synthesis process which comprises the following steps: S1, material selection and preparation: selecting corresponding raw materials according to tetramethyltin synthesis requirements, dividing the raw materials into main materials, auxiliary materials and additives, and subsequently weighing the raw materials by using a weighing device; s2, material pretreatment: adding the weighed main material into a dehydration device, starting the dehydration device to carry out dehydration treatment, detecting after dehydration is finished, and taking out the dehydrated main material when a detection result meets a standard; by introducing the double-stage design of low-temperature catalytic methylation and gradient heating reaction and combining a dimethyl sulfide catalytic system to replace a traditional iodine initiator and magnesium powder dynamic equilibrium mechanism, the reaction heat release rate is greatly reduced, the temperature in the whole reaction process is kept in a constant range, the material flushing or explosion risk caused by local overheating is thoroughly eliminated, and the product quality is improved. And intrinsically safe production is realized.

The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte, a preparation method thereof, an injection method and a lithium ion battery, the electrolyte comprises a first electrolyte for first injection and a second electrolyte for second injection, the first electrolyte comprises a first solvent, a first lithium salt and a first additive, the second electrolyte comprises a second solvent, a second lithium salt and a second additive, the first electrolyte comprises a first solvent, a first lithium salt and a first additive, the second electrolyte comprises a second solvent, a second lithium salt and a second additive, the mass percentage of the second electrolyte in the electrolyte is 5-20%, the first additive comprises dimethyl sulfide and vinylene carbonate, and the second additive comprises triphenyl phosphate and vinylene carbonate. According to the electrolyte, the first additive comprises dimethyl sulfide, and the second additive comprises triphenyl phosphite, so that the bad problems of high-temperature gas production and negative electrode interface black spots in the use process of a lithium-rich material lithium supplementing agent are solved.

The invention discloses a method for removing nitrogen dioxide in dimethyl sulfoxide, and particularly relates to a method for removing nitrogen dioxide in a dimethyl sulfoxide crude product in the process of producing dimethyl sulfoxide from dimethyl sulfide, oxygen and nitrogen dioxide. A dimethyl sulfoxide crude product is introduced into the reactor, and the high-purity dimethyl sulfoxide can be separated and recovered from the crude product by circularly and repeatedly blowing off the dimethyl sulfoxide crude product in a closed device through nitrogen. The production method is suitable for a technology for producing dimethyl sulfoxide through nitrogen dioxide liquid phase oxidation, nitrogen dioxide in the crude product dimethyl sulfoxide is removed, the loss amount of nitrogen dioxide in the air stripping treatment process is greatly reduced, the operation process is easy and convenient to control, and the production method is suitable for modification and upgrading of an existing similar dimethyl sulfoxide production technology.

The invention discloses asphalt-based hard carbon, a preparation method thereof and a sodium-ion battery negative electrode material, and relates to the technical field of sodium-ion batteries. The preparation method of the asphalt-based hard carbon comprises the following steps: S1, mixing an asphalt precursor, a sulfur source and a cross-linking agent, and performing cross-linking vulcanization treatment at a first temperature to obtain a primary product; s2, performing carbonization treatment on the primary product at a second temperature to obtain asphalt-based hard carbon; the sulfur source is any one of elemental sulfur, thiourea, dimethyl sulfide and sulfide, or any two of elemental sulfur, concentrated sulfuric acid, thiourea, dimethyl sulfide and sulfide. By adopting the method, the type of the sulfur source is controlled, and the sulfur source and the cross-linking agent are added, so that the reversible capacity and the rate capability of the asphalt-based negative electrode material can be effectively improved, and the application field of the asphalt-based negative electrode material is widened.

A dimethyl sulfoxide synthesis system and a synthesis method, the system comprising: a fixed bed reactor (2) used to synthesize dimethyl sulfide, and an oxidation reactor (4) used to synthesize dimethyl sulfoxide. An external intensification unit (9) is disposed outside the oxidation reactor (4), the external intensification unit (9) comprising a first intensification reactor (901) and a second intensification reactor (902), the first intensification reactor (901) being disposed above the second intensification reactor (902), the first intensification reactor (901) being connected to a discharge port at a bottom end of the fixed bed reactor (2), the second intensification reactor (902) being connected to a nitrogen dioxide or oxygen storage tank (13), a connecting pipe (903) being disposed between the first intensification reactor (901) and the second intensification reactor (902), and a static mixer (904) being disposed in the connecting pipe (903).

The invention discloses a process and a device for recycling nitrogen dioxide, which are characterized in that degassed crude dimethyl sulfoxide is used as a raw material, nitrogen dioxide is absorbed by two stages of crude dimethyl sulfoxide and enters a micro-channel reactor to be used as a catalyst for oxidizing dimethyl sulfide, and recycling is realized. The device comprises a tail gas absorption unit, a microreactor unit, a heat exchanger unit and a separator unit, the technology adopts a dimethyl sulfoxide low-temperature absorption technology, and has the advantages of cyclic utilization of nitrogen oxides, energy conservation and emission reduction, convenience in operation, greenness, high efficiency and the like.

The embodiment of the invention provides a method for recovering gold from a multi-metal complex acid solution system, and the method comprises the following steps: pretreating a gold-containing complex acid solution, the pH value of the gold-containing complex acid solution is less than or equal to 4.5, and the gold content in the gold-containing complex acid solution ranges from 0.1 mg / L to 20 mg / L; an extraction agent is added into the gold-containing complex acid solution according to the extraction phase ratio O / A of 1: 20-1: 1, raffinate and a gold-loaded organic phase are obtained, and the extraction agent comprises one or more of ketone extraction agents such as methyl isobutyl ketone, dibutyl carbitol, trioctylamine, tribenzylamine and dimethyl sulfide, alcohol extraction agents, amine extraction agents and ether extraction agents; and separating and purifying gold in the gold-loaded organic phase to obtain a target gold product. The method is simple in process, easy to operate and low in cost, the high gold recovery rate can be obtained through primary extraction, efficient comprehensive utilization of gold in the gold smelting slag can be achieved, and environmental pollution is reduced.

The invention relates to the technical field of organic sulfide preparation, in particular to a method for synthesizing and refining dimethyl sulfide (DMS) and dimethyl sulfoxide (DMSO) embedded into a methanol plant, which mainly utilizes high-purity oxygen of an air separation unit of the methanol plant, a high-concentration hydrogen sulfide product of low-temperature methanol washing and part of top gas-phase refined methanol of a pressurizing tower of a methanol rectification device. The production cost of the product is reduced, the added value of the product is improved, and the hydrogen sulfide product of a methanol plant is effectively utilized.

The invention belongs to the technical field of preparation of adsorption separation functional materials, and discloses a controllable preparation method and application of an S-COFs nanosheet adsorbent. According to the method, 2, 5-dimethyl sulfide terephthalaldehyde DMTTPA and 1, 3, 5-tris (4-aminophenyl) benzene TAPB are taken as monomers, cyanobenzene is taken as a reaction solvent, benzoic acid is taken as a catalyst, aniline is taken as a competitor, and the high-crystallinity S-COF adsorbent is controllably prepared under the condition of high temperature by accurately regulating and controlling crystallization time and combining a dialysis purification technology. The method not only realizes controllable morphology, but also greatly improves the adsorption performance. The method has important economic value in the field of precious metal recovery, the problems of precious metal resource waste and environmental pollution in electronic waste can be effectively solved, and meanwhile, a new thought is provided for designing a low-cost high-performance adsorbent.

The invention provides an anti-temperature interference core-sheath structure strain sensing fiber and a preparation method thereof, and relates to the technical field of composite materials, the fiber comprises a flexible core layer and a conductive shell layer coating the flexible core layer; wherein the flexible core layer is prepared by mixing thermoplastic polyurethane and DMF (Dimethyl Formamide); the conductive shell layer is prepared by mixing thermoplastic polyurethane, DMF (Dimethyl Formamide), a silver nanowire and a multi-walled carbon nanotube, and the mass ratio of the silver nanowire to the multi-walled carbon nanotube is (0.12-0.15): (0.05-0.1). The excellent temperature interference resistance is realized in a wide temperature range (0-60 DEG C) by regulating silver nanowires with positive resistance temperature coefficients and multi-walled carbon nanotube materials with negative resistance temperature coefficients, the resistance temperature coefficients reach 300 ppm / DEG C, and meanwhile, the fiber is endowed with excellent elasticity by the core-sheath structure. Continuous production is achieved through wet spinning, efficiency is high, and cost is low.

The invention relates to the technical field of electrochemical synthesis, in particular to an electrochemical preparation method of dimethyl sulfoxide, which comprises the following steps: uniformly mixing a solvent, dimethyl sulfide, water and electrolyte to obtain an electrolysis system, and carrying out electrolytic reaction on the obtained electrolysis system to obtain dimethyl sulfoxide. According to the electrochemical preparation method of the dimethyl sulfoxide, the dimethyl sulfide is taken as a raw material, and the dimethyl sulfoxide is obtained in one step with high Faraday efficiency. Compared with a traditional dimethyl sulfoxide synthesis method, the method has the advantages of small pollution, high atom utilization rate and weak corrosion to devices, and meets the requirements of green and safe production. According to the electrochemical preparation method of the dimethyl sulfoxide, an additional oxidant is not needed, and the only by-product is hydrogen, so that the requirement of green synthesis is met. And moreover, the Faraday efficiency of the reaction is high, and the method has a better industrial application prospect.

The utility model discloses a thin film evaporation device for removing dimethyl sulfide, which comprises a thin film evaporation container main body, the top of the thin film evaporation container main body is provided with a feed port, and the top of the right side of the thin film evaporation container main body is provided with a steam heating external connection pipe used for being externally connected with a steam heater; and a film mesh is arranged in the film evaporation container main body. According to the utility model, the dimethyl sulfide material is spread on the film mesh through the rotating scraper blade to form a film so as to promote evaporation, and the thickness of the film scraped by the scraper blade can be adjusted according to the viscosity of the material and the change of the raw material, so that the situation that the evaporation efficiency is influenced by the too thick or too thin dimethyl sulfide material in the prior art is avoided; and the structure is simple, and adjustment is convenient, so that the scraper blade can flexibly adjust the thickness of the film according to actual changes, the adaptability in evaporation use is improved, and the use requirement for accurate removal of dimethyl sulfide is greatly met.

The present invention relates to the field of lithium-ion battery technology, and more particularly to an electrolyte, a preparation method thereof, an injection method, and a lithium-ion battery. The electrolyte comprises a first electrolyte for a first injection and a second electrolyte for a second injection. The first electrolyte comprises a first solvent, a first lithium salt, and a first additive, and the second electrolyte comprises a second solvent, a second lithium salt, and a second additive. The second electrolyte accounts for 5% to 20% of the electrolyte by mass, the first additive comprises dimethyl sulfide and vinylene carbonate, and the second additive comprises triphenyl phosphite and vinylene carbonate. By including dimethyl sulfide in the first additive and triphenyl phosphite in the second additive, the electrolyte improves the problems of high-temperature gassing and black spots at the negative electrode interface during use of lithium-rich material lithium supplements.

The invention discloses a production device for producing dimethyl sulfoxide by using a micro-channel reactor and application of the production device, and belongs to the technical field of dimethyl sulfoxide production. The production device for producing dimethyl sulfoxide by using the micro-channel reactor comprises a refined thioether buffer tank and a hydrogen peroxide buffer tank, the refined thioether buffer tank is connected with a sulfoxide reaction device through a pipeline, a rectified ether feeding pump is mounted on the pipeline between the refined thioether buffer tank and the sulfoxide reaction device, and the hydrogen peroxide buffer tank is connected with the refined thioether buffer tank through a pipeline between the refined thioether buffer tank and the sulfoxide reaction device. The hydrogen peroxide buffer tank is connected with the sulfoxide reaction device through a pipeline, and a hydrogen peroxide feeding pump is mounted on the pipeline between the hydrogen peroxide buffer tank and the sulfoxide reaction device. According to the production device for producing dimethyl sulfoxide by using the micro-channel reactor, mixing, heat exchange and reaction are integrated by using the micro-channel reactor, so that dimethyl sulfide and hydrogen peroxide are fully mixed, reaction heat is removed while the reaction is rapid, and the reaction is better controlled.

The invention relates to the technical field of preparation of deuterated dimethyl sulfoxide, and provides a catalyst for preparing deuterated dimethyl sulfoxide, application of the catalyst and a preparation method of deuterated dimethyl sulfoxide, and the catalyst is a highly crystallized MOF material (ZIF-7)-on-(Co-BTC); the preparation method of the deuterated dimethyl sulfoxide comprises the following steps: (1) taking deuterium gas and sulfur as raw materials to react at high temperature, and then cooling to room temperature to obtain deuterium sulfide; (2) taking the deuterium sulfide obtained in the step (1), deuterated methanol and gamma-Al2O3 as raw materials, and reacting at high temperature to obtain deuterated dimethyl sulfide; (3) the deuterated dimethyl sulfide obtained in the step (2) is used as a raw material, in the presence of a (ZIF-7)-on-(Co-BTC) catalyst, oxygen and nitrogen dioxide, deuterated dimethyl sulfoxide is obtained through oxidation, and then high-purity deuterated dimethyl sulfoxide is obtained through rectification; the high-purity and large-scale production of the deuterated dimethyl sulfoxide can be met, and the deuteration degree of the deuterated dimethyl sulfoxide can reach 99.8% or above.

The present application provides a purification method of high-purity dimethyl sulfide by cyclic extraction and dimethyl sulfide. It relates to the field of purification technology. The purification method of high-purity dimethyl sulfide by cyclic extraction comprises: extracting crude dimethyl sulfide synthesized from methanol and hydrogen sulfide to remove unreacted methanol impurities; distilling the extracted dimethyl sulfide to remove alkane impurities; treating the dimethyl sulfide after distillation with liquid alkali to remove acidic impurities; distilling the dimethyl sulfide after alkali washing again to remove excess water to obtain high-purity dimethyl sulfide. The purification method of high-purity dimethyl sulfide by cyclic extraction has high product purity.

The invention relates to a combined structure of small-diameter tower plates, which is mainly used for liquid collection, distribution and mass transfer processes, and is particularly suitable for synthesis and refining processes of dimethyl sulfide (DMS) and dimethyl sulfoxide (DMSO). The device comprises a tray (1), an upper flange (2), a clamping piece (3), a lower flange (4), a tubular distributor (5) and a packed bed layer limiter / distribution guide plate (6) from top to bottom, the tower tray (1) adopts a radial flow design, and liquid descends from the middle to flow towards the periphery and then flows from the periphery to the middle; and the tubular distributor (5) and the packed bed layer limiter / distribution guide plate (6) are combined into a whole. According to the small-diameter tower plate structure, the mass transfer efficiency is remarkably improved.

The utility model relates to the technical field of wine liquid production, in particular to deodorizing spirit distillation equipment which comprises a distillation copper pot, a condenser and at least one maintaining pipe. The distillation copper pot is used for distilling the wine liquid into wine liquid steam. The condenser is arranged outside the distillation copper pot and located on the downstream portion of the distillation copper pot so as to be used for receiving and condensing wine steam in the distillation copper pot. The maintaining pipe is located between the distillation copper pot and the condenser and used for conveying wine steam in the distillation copper pot to the condenser. The maintaining pipe made of the copper-containing material is arranged between the distillation copper pot and the condenser, and the maintaining pipe is arranged upwards in the vertical direction in a winding manner, so that the reaction time between the wine steam and the copper material is prolonged, the odor carried by components such as dimethyl sulfide in the wine steam is better purified, and the quality of the wine is improved. And various flavor sensory characteristics are added to the spirit.

The invention discloses a tetra-coordinated boron-oxygen heterocyclic compound and a preparation method thereof, and belongs to the technical field of pharmaceutical and chemical intermediates and related chemistry. The method comprises the following steps: by taking a bis (pentafluorophenyl) borane dimethyl sulfide complex [(C6F5) 2BHSMe2] as a boron source, firstly carrying out hydroboronation reaction on the bis (pentafluorophenyl) borane dimethyl sulfide complex [(C6F5) 2BHSMe2] and an eneyne compound to generate a three-coordination alkenyl boron dienophile intermediate in situ, and then carrying out reverse electron demand Diels-Alder reaction on the three-coordination alkenyl boron dienophile intermediate and an acetylenic ketone compound to synthesize a series of tetra-coordination boron-oxygen heterocyclic compounds. The method has the advantages of mild reaction conditions, good selectivity, high yield, wide substrate application range, environmental friendliness, simplicity and convenience in operation and the like, opens up a new way for synthesis of the tetra-coordinated organoboron compound, and has higher application value and social and economic benefits.

The invention belongs to the technical field of organic fluorine chemical industry, and particularly relates to hexafluoropropylene oxide as well as a synthesis method and a synthesis device thereof. The synthetic method of the hexafluoropropylene oxide comprises the following processes: firstly, heating dimethyl sulfide and monochlorodifluoromethane in a solvent for reaction, then adding the obtained intermediate into a sodium hydride solution at 30-50 DEG C for reaction to obtain a reaction solution, finally, adding trifluoroacetyl fluoride into the reaction solution for reaction at 15-30 DEG C, treating the obtained reaction solution, and finally, separating and purifying to obtain the hexafluoropropylene oxide. The hexafluoropropylene oxide is obtained. And recovering the solvent and dimethyl sulfide. The synthesis method of hexafluoropropylene oxide provided by the invention is mild in reaction condition and stable in reaction, the synthesized hexafluoropropylene oxide is high in yield and high in purity, and the invention also provides a synthesis device of hexafluoropropylene oxide, which is low in energy consumption.

The invention discloses a synthesis method of a high-abundance C-13 ethylene oxide compound, which comprises the following steps: (1) carrying out reaction on 13CH3I and diphenyl sulfide to obtain [13C] diphenylmethyl iodide; and (2) reacting the [13C] diphenylmethyl iodide with a carbonyl compound to obtain the high-abundance [13C] ethylene oxide compound. Diphenyl sulfide is adopted to replace dimethyl sulfide, the obtained [13C] methyl diphenyl sulfonium iodide avoids C-13 loss in the subsequent reaction process, and the abundance of C-13 is effectively improved.

The present invention relates to a solid malt extract spray freeze-drying device capable of reducing the content of dimethyl sulfide, which comprises an atomization system, a refrigeration system, a vacuum freezing system, a heating system and a control system. The atomization system includes an air compressor, a pressure atomizer, a pressure vessel and a material container. The air compressor is connected to the pressure vessel through a pressure transmission pipeline, and the pressure atomizer is connected to the pressure vessel through a material feeding pipeline. The refrigeration system includes a refrigerator, a condenser, a fan and a separation dust collector. The condenser and the fan are connected to the drying chamber through a cold air circulation pipeline. The vacuum pump of the vacuum system is connected to the drying chamber through a cold trap. The heating system is a heating partition plate and an electric heater at the bottom of the drying chamber. The preparation device of the present invention can remove the bad volatile sulfide dimethyl sulfide in the wort during the drying process, and prepare a solid malt extract powder with the dimethyl sulfide content completely removed. The reconstituted solid malt extract powder has an excellent flavor.

A method by which an intermediate product of an azole derivative can be produced at a lower cost than known production methods is provided. A method for producing a compound represented by General Formula (IV) includes converting a compound represented by General Formula (II) into the compound represented by General Formula (IV) using (a) dimethyl sulfide and / or dimethyl sulfoxide, and (b) a methyl-LG (an LG is a nucleophilically substitutable leaving group and is selected from the group consisting of a halogen group, an alkoxysulfonyloxy group, an aryloxysulfonyloxy group, an alkylsulfonyloxy group, a haloalkylsulfonyloxy group, and an arylsulfonyloxy group) in the presence of an inorganic base.

The present invention relates to the field of carbon aerogel technology, specifically disclosing a method for preparing a magnetic cellulose-carbon aerogel composite electrode material and its application. Using natural pulp as a precursor, the cellulose hydrogel is prepared via a sol-gel process. This hydrogel is then impregnated with ferric chloride, freeze-dried, and finally pyrolyzed in a tubular furnace to produce a magnetic cellulose-carbon aerogel (CA@Fe3O4) composite material. The magnetic cellulose-carbon aerogel prepared in this invention exhibits high specific surface area, good electrical conductivity, and excellent biocompatibility. Used in microbial fuel cell anodes, it can degrade dimethyl sulfide while converting chemical energy into electrical energy, enabling the renewable utilization of organic matter.

The present invention provides a continuous reaction device for preparing dimethyl sulfoxide, comprising a first storage tank, a second storage tank, a microreactor and a collection reaction tank. The first storage tank can hold dimethyl sulfide. The first storage tank is provided with a first discharge pipeline. The second storage tank can hold hydrogen peroxide. The second storage tank is provided with a second discharge pipeline, and the second discharge pipeline is provided with a plurality of branch pipelines. The microreactor has a flow reaction channel, and one end of the flow reaction channel is connected to the first discharge pipeline and one of the branch pipelines. The microreactor is provided with a plurality of auxiliary feeding ports arranged at intervals along the transmission path of the flow reaction channel, and each auxiliary feeding port is connected to each other branch pipeline in a one-to-one correspondence. The collection reaction tank is connected to the other end of the flow reaction channel. The continuous reaction device for preparing dimethyl sulfoxide provided by the present invention realizes multi-point feeding, can disperse reaction heat, can also adjust material ratio, ensure reaction effect, and has strong practicality.

The invention discloses a method for directly catalytically synthesizing dimethyl sulfide by sulfur, hydrogen and methanol. The catalyst used in the method is composed of an active component and a carrier, the active component is M1-K2O-M2, the carrier is γ-Al2O3, the CoO content in the catalyst is 2.5-4.8 wt%, the NiO content is 3.0-5.0 wt%, the K2O content is 0.3-0.5 wt%, and the MoO3 or WO3 is 12.0-15.0 wt%; the catalyst is placed in a fixed bed reactor, first the catalyst is vulcanized, hydrogen is introduced, the catalyst bed is heated, sulfur vapor is introduced, the vulcanization temperature is programmed to increase, vulcanization is performed, then the temperature is lowered, methanol vapor is introduced, dimethyl sulfide is catalytically synthesized, and the hydrogen space velocity is maintained at 300h ‑1 The reaction product is collected by freezing using a gas-liquid separator, and the selectivity of dimethyl sulfide is 96.4% to 98.5%.

The invention relates to a quantitative analysis method for determining trace dimethyl sulfide impurities in a dimethyl disulfide product, a high performance liquid chromatograph-variable wavelength detector is adopted for analysis, and the specific analysis method comprises the following steps: preparing a standard solution and a sample to be detected; and detecting the components of the sample to be detected by adopting a liquid chromatography system-variable wavelength detector (VWD). Wherein the detection conditions are as follows: a C18 chromatographic column, a quaternary pump and an automatic sampling system are adopted, a mobile phase A is ultrapure water, a mobile phase B is acetonitrile, the flow velocity is 0.8-1.2 mL / min, and the column temperature is 30-40 DEG C. According to the present invention, the strong ultraviolet response of DMDS is inhibited by using the high water phase environment, and the retention behavior and the peak shape of DMS are improved by using the solvation effect of the synergist so as to achieve the efficient separation of the main component and the trace impurity; in actual sample determination, the method successfully detects the residual trace DMS in the industrial grade disulfide, the result is stable and reliable, and the method is suitable for product quality control and process optimization.

The invention belongs to the technical field of dimethyl sulfoxide production, and particularly relates to a dimethyl sulfide oxidation production device. The device is characterized in that a 1mm spherical filler layer is arranged in the microreactor, two ends of the filler layer are respectively a feeding side microbubble distributor and a discharge port, the front end of the microbubble distributor is a mixed gas feeding port, the side end of the microbubble distributor is a liquid phase feeding port, the outer side of the reactor is a heat-conducting oil jacket, and a thermometer sleeve is arranged at the top end of the reactor and directly reaches the interior of the reactor. The reactor disclosed by the invention has the beneficial effects that the reactor is small in size, low in liquid holdup in the reactor and more comprehensive in internal temperature monitoring, the temperature in the reactor is more convenient to control, and the risk of out-of-control reaction is reduced; and the reactor is simple in structure, easy to manufacture, convenient to maintain and convenient for industrial amplification.