29 results about "Methyl sulfide" patented 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.

The application discloses a methyl sulfonate derivative and a preparation method and application thereof. The preparation method comprises the following steps: (1) adding carboxylic acid, dimethyl sulfoxide (DMSO) and potassium fluoride (KF) into a pressure-resistant reaction bottle, and heating at 180 DEG C for 6 hours through an oil bath; (2) after the reaction is completed, the obtained substance is extracted with ethyl acetate for three times, the organic layer is washed with water for two times in sequence, the washed organic layer is dried with anhydrous sodium sulfate, filtration is conducted, and a filtrate is obtained; (3) the obtained filtrate is concentrated under reduced pressure, the concentrated residue is separated and purified by using a silica gel column chromatography, and the methyl sulfonate derivative is obtained. The preparation method directly uses KF to catalyze the reaction of carboxylic acid and DMSO, does not need to use complex substrates, noble metal catalysts and phosphorus ligands, and has the advantages of simple operation, greenness, low cost and high yield (up to 92%).

The invention discloses a preparation method of trifluoromethyl sulfide, which comprises the step of reacting a trifluoromethyl reagent with sulfur in a polar aprotic solvent in the presence of fluoride to obtain the trifluoromethyl sulfide. The reaction conditions are mild, and trifluoromethyl sulfide can be prepared through one-step reaction.

The invention discloses an exhaled gas VOC (volatile organic compound) marker for detecting inflammatory bowel diseases and a detection system thereof. The marker is a combination of one or more of the following components: methyl propyl sulfide, propionaldehyde, cyclohexanone, allyl methyl sulfide, octanal, 2-pentanone, phenol, butyric acid, propionic acid and 3-methylheptane. The detection system comprises an exhaled air sampling module, a sample preprocessing module, a detection analysis module and a data analysis module. The marker provided by the invention has the advantages of high specificity and good stability, can realize accurate noninvasive diagnosis of IBD, and can assist in realizing early screening and dynamic monitoring in a clinical environment.

The invention provides anthracene methyl thiosulfonate for a photosensitive resin composition, and relates to the field of photopolymerization. The invention also comprises a photosensitive resin composition containing the anthracene methyl thiosulfonate, a photosensitive dry film containing the anthracene methyl thiosulfonate, and applications of the photosensitive resin composition and the photosensitive dry film. The anthracene methyl thiosulfonate provided by the invention has photosensitivity, can be used as a photosensitizer in a photosensitive resin composition, can improve the adhesive force of the photosensitive resin composition on various metal surfaces, has the characteristic of low migration, has good compatibility with monomers and solvents, and can be widely applied to the photocuring fields of dry films, paints, coatings, inks, molding materials and the like; and the photobleaching agent has extremely high photobleaching efficiency and is particularly suitable for being used in a formula of an ultra-thick film.

The invention discloses a preparation method of composite roasted peanut essence, which belongs to the technical field of essence, and comprises the following steps: preheating peanut oil and caprylic / capric triglyceride; the preparation method comprises the following steps: dissolving ethyl maltol, vanillin, methyl cyclopentenolone, 2, 3, 5-trimethylpyrazine and 2-acetylpyrazine; vanillin propylene glycol acetal, isovaleraldehyde propylene glycol acetal, triethyl citrate, delta-decalactone, delta-dodecalactone and 5-hydroxyethyl-4-methylthiazole are fused to obtain a mixture; dispersing the roasted peanut extract; 2, 3-dimethylpyrazine, 2-methoxyl-5-methylpyrazine and 4-methylthiazole are fused, and then the mixture is subjected to a reaction; the preparation method comprises the following steps: fusing cocaal, dimethyl sulfide, 2-ethyl-3, 5, 6-dimethylpyrazine, 2, 3, 5, 6-tetramethylpyrazine, 2-methylpyrazine, 2-acetylpyridine, 2-methoxy-3. 5. 6-isopropyl pyrazine, 2-methylthio-3-methylpyrazine, isovaleric acid, 1-octylene-3-alcohol, 5-methylfurfural and 3, 4-dimethyl-1, 2-cyclopentanedione; standing is performed; filtering is performed; the fragrance of the roasted peanuts is closer to that of the roasted peanuts which are just taken out of a furnace, and the natural flavor of the roasted peanut essence is increased.

The invention provides a carbon-coated nickel-chromium catalyst with an external sulfur source and a preparation method and application thereof, and the preparation method comprises the following steps: A) dissolving and mixing a nickel source, a chromium source and a carbon source in water, and removing a solvent to obtain a precursor; b) pyrolyzing the precursor in a protective atmosphere to obtain a catalyst precursor; and C) mixing the catalyst precursor with a sulfur source solution to obtain the carbon-coated nickel-chromium catalyst with the additional sulfur source, a sulfur source in the sulfur source solution comprises one or more of dimethyl sulfoxide, thioacetamide, thiourea, dimethyl disulfide, dimethyl sulfide and p-fluorothiophenol. According to the invention, a pre-sulfurization strategy of adding an organic sulfur source is innovatively adopted, so that the catalyst is endowed with low-temperature high efficiency, high selectivity and strong engineering suitability, and a bottom layer support is provided for kiloton-level industrial amplification.

The invention relates to low-heat-generation tread resin and a preparation method and application thereof.The low-heat-generation tread resin is of a core-shell structure and comprises an inner core and a long-chain structure wrapping the surface of the inner core, the inner core comprises polystyrene microspheres, and the long-chain structure comprises a trimethylsilyl methyl sulfide bond modified polybutadiene chain segment. The low-heat-generation tread resin is used for preparing a tread rubber material, and through the unique core-shell molecule design and multiple reaction sites, the dispersity of white carbon black can be effectively improved, a rubber-filler interface can be reinforced, and internal friction and energy dissipation of the interior of the rubber material during dynamic deformation are reduced; and the rolling resistance can be effectively reduced, the wear resistance is improved, and the good wet skid resistance is maintained, so that the tire prepared from the tread rubber material has the advantages of safety, durability and economical efficiency.

This invention relates to chemical synthesis, specifically a method for preparing high-content solid sparganum technical. 2-chloro-N-(4-chlorophenyl)-N-(isopropyl)acetamide is reacted with an acid-binding agent and a phase-transfer catalyst under solvent conditions, followed by the addition of methyl sulfide to obtain sparganum technical. This invention uses methyl sulfide to directly synthesize solid sparganum technical, eliminating the step of preparing ammonium methyl sulfide salts, shortening the process, and avoiding the generation of ammonium chloride salts and ammonia nitrogen in the technical wastewater. The condensation step of this invention, using methyl sulfide to directly synthesize solid sparganum technical, achieves a single-step yield of 96%, which is more than 2% higher than existing technologies, and the sparganum technical content reaches 97%.

The invention discloses a synthesis method of diaryl methyl sulfide under a biological compatibility condition, which comprises the following steps: adding a p-methylene benzoquinone derivative and a thiophenol thiol derivative into a reaction solvent, stirring and reacting for 4 hours at room temperature to obtain a reaction solution, filtering and removing the reaction solvent of the reaction solution to obtain diaryl methyl sulfide. And purifying by thin layer chromatography / column chromatography to obtain the diaryl methyl thioether compound. The p-methylene benzoquinone derivative used in the method is easy to synthesize, high in conversion rate and wide in applicable substrate range, and in addition, the method is simple in step, convenient to operate and high in product yield, does not use any metal compound, and has the advantages of being high in atom economy and environmentally friendly.

The invention discloses a room-temperature rapid preparation method of light metal hydroboron, and relates to the technical field of hydrogen storage materials. The method specifically comprises the following steps that S1, metal hydride is subjected to ball milling pretreatment according to a certain ball-to-material ratio; s2, mixing the pretreated metal hydride and dimethyl sulfide borane in a flask, then adding a solvent, and carrying out ultrasonic-assisted reaction; and S3, transferring the solid product into a tubular furnace, and carrying out vacuum drying to obtain the metal borohydride. The method has the advantages of simple process, low price, one-step reaction and high safety; the yield is obviously improved, the reaction conditions are obviously reduced, the production efficiency is greatly improved, and the method has an industrialization prospect.

The invention discloses walnut essence and a preparation method thereof. The essence comprises furanone, methyl cyclopentenolone, 2-acetylpyrazine and benzaldehyde acetal compounds as core components, and the four components synergistically provide vivid and stable roasted walnut characteristic aroma; preferably, the formula also contains auxiliary materials such as butanedione, ethyl maltol, ethyl 2-methylbutyrate, dimethyl sulfide and the like, and ethanol and propylene glycol are used as solvents. According to the invention, benzaldehyde acetal (such as benzaldehyde PGA) is adopted to replace free benzaldehyde, so that the stability of the essence in high-temperature processing is remarkably improved. The prepared essence is rich in fragrance level and lasting in fragrance, and can be widely applied to foods, beverages and daily chemical products.

The application discloses a preparation method of D,L-methionine, which comprises the following steps: mixing glycine ethyl ester hydrochloride, benzaldehyde and a solvent, heating to 40-50 DEG C, opening a negative pressure and a reflux water separation device, keeping the system outside steam by adjusting the negative pressure, and dropping triethylamine; solid-liquid separation is performed on the reaction solution, the liquid is heated to reflux, 2-chloroethyl methyl sulfide is dropped, and reflux reaction is continuously performed; the temperature of the reaction solution is reduced to less than or equal to 60 DEG C, the reflux is stopped, and hydrogen chloride gas is introduced; solid-liquid separation is performed on the reaction solution, the liquid is heated to reflux, hydrochloric acid is dropped, and reflux hydrolysis reaction is performed; the reaction solution is subjected to rotary evaporation, the remaining material is washed and dried to obtain D,L-methionine. The application adopts the mode of amino protection and removal, avoids the use of cyanide and high-temperature and high-pressure reaction, is safe and environment-friendly in the whole process, has high reaction selectivity, has few side reactions, and the by-products and the solvent are easy to separate, so that the cost is further reduced, and the industrialization popularization is facilitated.

This invention discloses a method for preparing dimethyl sulfoxide, relating to the field of electrochemical technology. The method for preparing dimethyl sulfoxide includes the following steps: passing gaseous dimethyl sulfide and water vapor into the anode of an electrochemical reaction device, passing water into the cathode of the electrochemical reaction device, and applying a DC voltage between the anode and cathode to carry out an electrochemical reaction to obtain a product containing dimethyl sulfoxide; wherein, the anode includes a composite matrix and a perfluorosulfonic acid ionomer loaded on the surface of the composite matrix; the composite matrix includes a first substrate and an anti-corrosion coating disposed on the surface of the first substrate, the anti-corrosion coating being made of at least one of ruthenium oxide, iridium oxide, antimony-doped tin oxide, tantalum oxide, and lead oxide, which solves the problems of high energy consumption, low product yield and selectivity in the preparation of dimethyl sulfoxide by liquid-phase electrochemical oxidation method in the prior art.

The invention discloses a synthesis method of trifluoromethyl sulfide, which comprises the following steps: in the presence of a catalyst, reacting trifluoroiodomethane with trifluoromethyl persulfane, and synthesizing to obtain the trifluoromethyl sulfide. The trifluoromethyl sulfide synthesis method provided by the invention has the advantages of few by-products and high reaction efficiency.

The application discloses coffee essence, atomized liquid and electronic atomization device, and belongs to the field of electronic atomizers. The coffee essence comprises 2-acetylpyrrole, vanillin, methylcyclopentenolone, maltol, furfuryl acetate, guaiacol, isopentyl alcohol propylene glycol solution, furfuryl mercaptan, 2-ethyl-3,5-dimethylpyrazine, isovaleric acid propylene glycol solution, 2,3,5-trimethylpyrazine, isobutyraldehyde, 2-methyl-3-(methylthio)pyrazine, isoamyl aldehyde, trigonellin, 4-hydroxy-2,5-dimethyl-3(2H)-furanone, 5-methylfurfural, dimethyl sulfide, 2-acetylfuran, 5-hydroxyethyl-4-methylthiazole, 2-acetylpyrazine, 4-ethylguaiacol, acetic acid, propionic acid, acetaldehyde propylene glycol solution, 4-methyl-5-(2-acetyloxyethyl)-thiazole and propylene glycol. The coffee essence has good stability, good compatibility and can accurately restore the real coffee roasting aroma.

The invention relates to the technical field of tembotrione acid preparation, and provides a tembotrione acid preparation method, which comprises: mixing 3-chloro-2-methyl phenyl methyl sulfide, 1, 2-dichloroethane, azodiisobutyronitrile and N-bromosuccinimide, stirring at a controlled temperature, and extracting to obtain 3-chloro-2-bromomethyl phenyl methyl sulfide; the preparation method comprises the following steps: mixing 3-chloro-2-bromomethyl phenyl methyl sulfide, trifluoroethanol, solid sodium hydroxide, TBAB and 1, 2-dichloroethane, stirring at a controlled temperature, and extracting to obtain 3-chloro-2-((2, 2, 2-trifluoroethoxy) methyl) phenyl methyl sulfide; the preparation method comprises the following steps: mixing 3-chloro-2-((2, 2, 2-trifluoroethoxy) methyl) phenylmethyl sulfide, anhydrous aluminum trichloride, dichloromethane and oxalyl chloride, stirring at a controlled temperature, heating, cooling, carrying out suction filtration, and drying to obtain 2-chloro-4-methylthio-3-((2, 2, 2-trifluoroethoxy) methyl) benzoic acid; the method comprises the following steps: oxidizing 2-chloro-4-methylthio-3-((2, 2, 2-trifluoroethoxy) methyl) benzoic acid, and extracting to obtain tembotrione acid. According to the method, the stability of the preparation yield of tembotrione acid and the total yield are remarkably improved.

3-chloro-2-methyl phenyl dimethyl sulfide is a key intermediate for synthesizing tembotrions, and the target product 3-chloro-2-methyl phenyl dimethyl sulfide is finally synthesized by taking 3-chloro-2-methylaniline and sodium methyl mercaptide as raw materials through diazotization and methyl mercaptan. In order to solve the danger problem existing in the diazotization production process, the invention provides a production process for continuous production of 3-chloro-2-methylphenyldimethyl sulfide in the micro-channel reactor, and the production process has the advantages that compared with a traditional reaction kettle, the micro-channel reactor is provided with a reaction channel with a small diameter, so that the yield of 3-chloro-2-methylphenyldimethyl sulfide is increased; and the catalyst has the advantages of large specific surface area, large volume ratio, high mass transfer and heat transfer efficiency, good operability, no obvious amplification effect and the like. Particularly, the risk of over-temperature explosion in the diazotization reaction process is greatly reduced due to the efficient heat transfer efficiency and the tiny material holding amount of the microreactor.

The invention relates to a polypeptide editing method based on a methionine desulfurization strategy, and the method comprises the following steps: 1) a reaction formula 1 is shown in the specification, (2) as shown in a reaction formula 2, the target sulfonium 1, electron-deficient olefin 2, a photocatalyst and N-heterocyclic carbene-borane are dissolved in the solvent, and a blue light irradiation reaction is performed at room temperature to obtain a modified product 3, and (3) as shown in the reaction formula 2, the target sulfonium 1, the electron-deficient olefin 2, the photocatalyst and the N-heterocyclic carbene-borane are dissolved in the solvent. According to the method, the desulfurization modification of methionine is realized by utilizing the homocleavage substitution reaction of sulfonium, on one hand, the modification strategy provides more choices for a biological coupling mode; on the other hand, the polypeptide obtained through modification has the advantages in the aspect of structural stability compared with a modified product in the prior art.

The application provides a zinc collector GZ-1 and a preparation method and application thereof. The zinc collector GZ-1 is composed of isobutyl xanthate propylene ester, isobutyl xanthate ethyl formate, isobutyl methyl sulfide amine ester and 2-methyl-1-benzyl-2-propanol. The preparation method is mixing isobutyl xanthate propylene ester, isobutyl xanthate ethyl formate, isobutyl methyl sulfide amine ester and 2-methyl-1-benzyl-2-propanol in a proper ratio.

The present application relates to the fields of medicine, organic chemical industry and fine chemical industry, and particularly relates to an alkyl trifluoromethyl sulfide compound and a synthesis method thereof. Under the protection of inert gas, a non-activated alkene is used as a substrate, N-trifluoromethyl thiosaccharin or N-trifluoromethylthio phthalimide is used as a trifluoromethylthio source, cyclohexyl mercaptan, p-methyl phenyl mercaptan or 2-methyl mercaptoacetate is used as a hydrogen source, inorganic alkali and organic photocatalyst are added in a reaction system, blue light is irradiated, and different substituted alkyl trifluoromethyl sulfide compounds are synthesized under room temperature conditions. The trifluoromethylthio reagent used in the present application is easy to prepare and has good stability, and the participation of noble metal silver salt is avoided. A 7.5% sodium hypochlorite solution is used for post-treatment to remove the unreacted mercaptan. The synthesis reaction condition involved in the present application is mild, the reaction efficiency is high, the regioselectivity is good, the universality is excellent, and the functional group compatibility is good.

The application provides a synthesis system and method of dimethyl sulfoxide, comprising: a fixed bed reactor for synthesizing dimethyl sulfide and an oxidation reactor for synthesizing dimethyl sulfoxide; an external strengthening unit is arranged outside the oxidation reactor, the external strengthening unit comprises a first strengthening reactor and a second strengthening reactor, the first strengthening reactor is arranged above the second strengthening reactor, the first strengthening reactor is connected with a discharge port at the bottom end of the fixed bed reactor, the second strengthening reactor is connected with a nitrogen dioxide or oxygen storage tank, a communication pipeline is arranged between the first strengthening reactor and the second strengthening reactor, and a static mixer is arranged in the communication pipeline. The synthesis system of the application is based on the strengthening reaction technology, raw materials are broken and dispersed into micron-sized bubbles through the strengthening reactor, the mass transfer rate of the gas-phase raw materials to the reaction liquid and the macroscopic reaction rate are greatly improved, and the raw material conversion rate is improved.

The purpose of the present invention is to provide a composition that has a favorable flavor that is unique to mustard seeds, such as sweetness, and that has suppressed pungency. Firstly, the present invention relates to a method for producing an oil-based paste-like composition containing pulverized mustard seeds, the method comprising a step of pulverizing the mustard seeds in a mixture of mustard seeds and an oil or fat. Secondly, the present invention relates to an oil-based paste-like composition containing pulverized mustard seeds in which the content of allyl isothiocyanate is significantly lower than that of untreated mustard seeds, and the content of one or more of 2-methyltetrahydrofuran-3-one, 2-furfurylthiol, α-angelica lactone, 2-methyltetrahydrothiophen-3-one, tetrahydrothiophen-3-one, β-angelica lactone, γ-crotonolactone, dimethyl sulfone, furfuryl methyl sulfide, 1-furfuryl pyrrole, and guaiacol is remarkably higher than that of untreated mustard seeds.

This invention provides anthracene methyl thiosulfonate for use in photosensitive resin compositions, relating to the field of photopolymerization. The invention also includes photosensitive resin compositions containing the anthracene methyl thiosulfonate, photosensitive dry films containing the anthracene methyl thiosulfonate, and their applications. The anthracene methyl thiosulfonate of this invention is photosensitive and can be used as a photosensitizer in photosensitive resin compositions. It can also improve the adhesion of photosensitive resin compositions to various metal surfaces, exhibits low migration characteristics, and has good compatibility with monomers and solvents. It can be widely used in photocuring fields such as dry films, paints, coatings, inks, and molding materials; it has extremely high photobleaching efficiency and is particularly suitable for use in ultra-thick film formulations.

The application provides application of a shaped titanium silicate molecular sieve in preparation of dimethyl sulfoxide; the content of aluminum oxide in the shaped titanium silicate molecular sieve is 1wt%-2wt%; the content of silicon oxide in the shaped titanium silicate molecular sieve is 90wt%-95wt%; and the content of titanium oxide in the shaped titanium silicate molecular sieve is 4wt%-5wt%. The application also provides a corresponding preparation method of dimethyl sulfoxide, which uses a shaped small-grain titanium silicate molecular sieve as a catalyst and self-product dimethyl sulfoxide as a solvent to solve the solubility problem of raw materials, realizes the reaction of dimethyl sulfide and hydrogen peroxide to produce dimethyl sulfoxide in a pipe reactor at 25-45 DEG C under relatively mild conditions, and the selectivity of dimethyl sulfoxide is more than 99%.

Provided are: a coffee-flavored chocolate composition containing a roasted coffee bean pulverized product, wherein a deterioration odor that becomes apparent during long-term storage is masked; and a method for producing same.　In the production of this chocolate composition containing a roasted coffee bean pulverized product having a median diameter of 20 μm or less, furfuryl methyl sulfide and / or guaiacol are blended.

The present application relates to a kind of method for synthesizing benzoate derivatives from dimethyl sulfoxide, belong to the application technical field of organic sulfide, solve the technical problems such as the synthesis of existing aryl formate generally needs strong acid or strong base, synthesis product and synthesis condition have limitation etc. Solution is as follows: a kind of method for synthesizing benzoate derivatives from dimethyl sulfoxide, 1) preparation benzyl methyl sulfide: dimethyl sulfoxide is placed with benzyl bromide in reaction vessel and is prepared to obtain benzyl methyl sulfide at first temperature sufficient reaction;2) preparation benzoate derivative: photosensitizer, inorganic base, organic solvent, the benzyl methyl sulfide prepared in step 1) and organic bromide are placed in reaction vessel, and benzoate derivative is prepared to obtain under the condition of second temperature and target atmosphere by visible light range illumination sufficient reaction. Compared with prior art, the present application has the advantages of high efficiency, green economy, mild condition, social benefit and economic benefit etc.

The invention relates to the technical field of synthesis of organic chemicals, in particular to methionine and a preparation method thereof. The preparation method of methionine provided by the invention comprises the following steps: (1) dissolving isonitrile acetate in an aprotic solvent to form a first solution, adding a non-nucleophilic strong base into the first solution for reaction, and then adding 2-halogenated ethyl methyl sulfide for reaction to obtain a reaction solution containing 2-isocyan-4-(methylthio) butyrate; (2) adding an ammonium salt of an acid and an alcohol solvent into the reaction solution of the 2-isocyanato-4-(methylthio) butyrate obtained in the step (1), and reacting to obtain a 2-amino-4-(methylthio) butyrate solution; and (3) adding alkali into the 2-amino-4-(methylthio) butyrate solution obtained in the step (2) to carry out saponification reaction, and then adjusting the pH value to 5-7 to obtain methionine. The preparation method provided by the invention avoids the use of high-toxicity reagents, and the reaction is safer.