60 results about "Methyl sulfide" patented technology

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 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 special columnar activated carbon catalyst for removing methyl sulfide and a preparation method thereof, and relates to the technical field of adsorption material preparation, and the preparation method comprises the following steps: taking columnar activated carbon as a raw material; soaking with hydrochloric acid, filtering, drying at 150 DEG C, mixing the dried sample with water, carrying out hydrothermal reaction at 80 DEG C for 180 minutes, filtering, and drying to obtain modified activated carbon; cuprous chloride and ammonia water are stirred and mixed to prepare a cuprous diamminechloride solution; and immersing the modified active carbon in a cuprous diamminechloride solution, stirring until the solution is completely absorbed by the active carbon, standing, drying through hot air at 170 DEG C, and adjusting the temperature to 140-160 DEG C when the active carbon is in a boiling state to prepare the impregnated active carbon after calcination and drying.

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.

The invention discloses a preparation method of 2-chloro-3-methyl-4-(methylsulfonyl) benzoic acid, which comprises the following steps: by taking 2, 6-dimethylchlorobenzene as an initial raw material, carrying out Friedel-Crafts acylation reaction, reduction reaction, methylation reaction and oxidation reaction to obtain the 2-chloro-3-methyl-4-(methylsulfonyl) benzoic acid. The starting raw material 2, 6-dimethylchlorobenzene is cheap and easy to obtain; the preparation process does not involve a diazotization reaction, does not use a methyl sulfide reagent, takes oxygen as a green oxidant, and is high in yield of each step, simple and convenient to operate and suitable for industrial mass production.

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 present invention relates to a photocurable composition comprising: - a cyanoacrylate A selected from the group consisting of: n-hexylcyanoacrylate, n-heptylcyanoacrylate, n-octylcyanoacrylate, and mixtures thereof; - a radical photoinitiator; - a metallocene compound; - a compound B selected from boron trifluoride, boron trifluoride etherate, boron trifluoride dihydrate, boron trifluoride ethanol, boron trifluoride methanol, boron trifluoride acetic acid, boron trifluoride butyl ether, boron trifluoride butanol, boron trifluoride propanol, boron trifluoride dimethyl sulfide, boron trifluoride acetonitrile, boron trifluoride tetrahydrofuran, boron trifluoride isopropyl alcohol; - optionally a radical polymerization inhibitor, provided that when the photocurable composition comprises a radical polymerization inhibitor, its weight content is 0.04% by weight or less; wherein the molar content of compound B is greater than or equal to 0.141 mmol per 1 kg of the composition; and wherein the molar ratio metallocene compound / compound B ranges from 2 to 8.

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 present invention relates to the technical field of fine chemical engineering, and discloses a method for preparing 2,2-dibromoacetophenone by C-S bond cleavage. The specific steps are as follows: Using 1-phenylethyl methyl sulfide as the reaction raw material, dichlorodimethylhydantoin and water as important additives, heating and reacting in an organic solvent to obtain the target product 2,2-dibromoacetophenone. This method has the advantages of simple operation, avoiding the use of additional catalysts and the use of highly toxic and corrosive liquid bromine, and has potential application value.

The invention discloses a method for synthesizing dimethyl sulfoxide, and particularly relates to a production system and a preparation method of dimethyl sulfoxide by taking dimethyl sulfide, oxygen and nitrogen dioxide as raw materials. Dimethyl sulfoxide is added into the oxidation reactor until overflowing and discharging are carried out, and the dimethyl sulfoxide is used as a reactor bottom material for material circulation and temperature control; continuing to add dimethyl sulfoxide to a specified liquid level of the stripping tower kettle, and starting the tower kettle to heat to a specified temperature; quantitatively adding nitrogen dioxide into the oxidation reactor until the pressure of a reaction system is stable; dimethyl sulfide and oxygen are continuously metered and fed, and dimethyl sulfoxide is continuously metered and discharged. The systematic production method provided by the invention realizes closed-loop use of nitrogen dioxide in a reaction system, the nitrogen dioxide loss in the production process is greatly reduced, the output of waste salt in the production process is also reduced, the reaction process is simple and convenient to control and safe to operate, and the method is suitable for upgrading and reconstruction of existing similar production processes.

The invention discloses a preparation method and application of novel magnetic ionic liquid for removing hydrogen sulfide, and the method comprises the following steps: reacting 4-methyl-1-piperazine-1 carboxylic acid with diethyl propyl oxygen tetrafluoroborate to obtain a first product; reacting the first product with 1-chlorobutane to obtain a second product; in a nitrogen atmosphere, adding the second product into a mixed solution of trifluoroacetic acid and thioanisole, and continuously stirring under a predetermined condition to obtain a third product; the third product is subjected to a reaction with diethylenetriamine, and an intermediate product [AEIMPP] Cl is obtained; and reacting the [AEIMPP] Cl with anhydrous FeCl3 to obtain the magnetic ionic liquid [AEIMPP] [FeCl4]. According to the invention, the novel [AEIMPP] [FeCl4] magnetic ionic liquid is used as a desulfurization liquid of an absorbent. The novel magnetic ions have the effect of an oxidizing agent, and the novel ionic liquid has good stability.

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.

The utility model relates to a device for continuously oxidizing dimethyl sulfide by using a reaction centrifugal machine, which mainly comprises a feeding device, a reaction centrifugal machine and a discharging device which are connected through a material pipeline, a cavity pre-cooling heat exchanger is arranged outside the reaction centrifugal machine; the light phase outlet is connected with a condenser and then connected into a dimethyl sulfoxide aqueous solution receiving tank, and the light phase outlet is connected with a dichloromethane receiving tank. According to the technical scheme, the reaction centrifugal machine is adopted, so that the mass transfer efficiency is high, raw materials are instantly and fully mixed, the reaction rate is increased, and the reaction time is greatly shortened; the separation effect is good, the operation is simple and convenient, and the production efficiency is improved; continuous production operation can be realized, the treatment capacity is large, the power consumption is low, and the product quality stability is improved; the equipment integration degree is high, and the occupied space can be reduced; the product is high in yield and high in purity.

The utility model discloses a continuous automatic precise feeding system for preparing dimethyl sulfoxide, and relates to the technical field of dangerous chemical process synthesis. The equipment comprises a first input pipeline, a solvent buffer tank, a first precise automatic weighing scale, a first micro-filter, a first automatic mass flow meter, a first bypass pipeline, a first one-way check valve, a second one-way check valve, a second input pipeline, an oxidant buffer tank, a second precise automatic weighing scale, a second micro-filter and a second automatic mass flow meter. The system comprises a first input pipeline, a second bypass pipeline, a third one-way check valve, a fourth one-way check valve, a third input pipeline, a dimethyl sulfide buffer tank, a third precise automatic weighing scale, a third micro-filter, a third automatic mass flow meter, a third bypass pipeline, a fifth one-way check valve, a DMSO reaction system and a DCS control system. The dimethyl sulfide conversion rate and the effective utilization rate of the oxidizing agent are improved, continuous and automatic DMSO feeding is achieved, and potential safety hazards and labor cost of feeding are reduced.

The present invention relates to a technique for stably providing a sterilized dairy product that excellently retains both a rich feeling and a refreshing feeling. More specifically, the present invention relates to a sterilized dairy product that satisfies (A) and at least one selected from (B) to (D).　(A) The concentration of dimethyl sulfide is 27-63 ppb. (B) The concentration of hexanal is 3.2 ppb or lower. (C) The concentration of δ-decalactone is 112-140 ppb. (D) The concentration of δ-dodecalactone is 1,290-2,300 ppb.

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 invention relates to a method for synthesizing benzoate derivatives from dimethyl sulfoxide, belongs to the technical field of application of organic sulfides, and solves the technical problems that existing aryl formate synthesis generally needs strong acid or strong alkali, synthetic products and synthetic conditions are limited and the like. The solution is as follows: the method for synthesizing benzoate derivatives from dimethyl sulfoxide comprises the following steps: 1) preparing benzyl methyl sulfide: putting dimethyl sulfoxide and benzyl bromide or benzyl bromide derivatives into a reaction container, and fully reacting at a first temperature to prepare benzyl methyl sulfide; and 2) preparation of the benzoate derivative: putting a photosensitizer, an inorganic base, an organic solvent, the benzyl methyl sulfide prepared in the step 1) and an organic bromide into a reaction container, and fully reacting under the irradiation of a visible light range at a second temperature and a target atmosphere condition to prepare the benzoate derivative. Compared with the prior art, the method has the advantages of high efficiency, greenness, economy, mild conditions, high social and economic benefits and the like.

The present invention provides a dimethyl sulfide C(sp 3 )-H bond boride, synthesis method and application, belonging to the field of organic synthesis. The present invention relates to a methyl sulfide C (sp 3 The invention discloses a selective synthesis method of )-H bond boron compounds, wherein a methyl sulfide compound and a pinacol boron ester are reacted under the synergistic catalysis of a novel bipyridine ligand and a transition metal iridium catalyst. The synthesis method achieves high selectivity of methyl C (sp) from a methyl sulfide compound without a directing group without using a protecting group. 3 )-H bond borylation reaction, the product selectivity is high, the yield is generally 65-85%, the reaction conditions are mild, and the operation is simple.

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 provides a catalyst for synthesizing dimethyl sulfide from hydrogen sulfide and methanol. The catalyst comprises a carrier and an active component in a mass ratio of 1: (0.1-1), the carrier comprises pseudo-boehmite, a sulfamic acid compound and titanium pyrophosphate, and the mass ratio of the pseudo-boehmite to the sulfamic acid compound to the titanium pyrophosphate is (90-99): (0.5-5): (0.5-5); the active components comprise a soluble tungsten-containing compound, a potassium alkoxide compound and ammonia water, and the mass ratio of the soluble tungsten-containing compound to the potassium alkoxide compound to the ammonia water is 1: (0.1-1): (1-2). The sulfamic acid compound is adopted in the catalyst for synthesizing the dimethyl sulfide from the hydrogen sulfide and the methanol, the Lewis acidity of the aluminum oxide carrier can be improved through a sulfonic acid group in the sulfamic acid compound, the yield of the dimethyl sulfide is increased, the yield of the methyl mercaptan is inhibited, and the selectivity of the dimethyl sulfide is improved.