32 results about "Methyl disulfide" patented technology

The present invention relates to a composition for controlling wood pests and use thereof. Specifically, the composition of the present invention comprises dimethyl disulfide (DMDS) and carbon dioxide (CO2) as active ingredients to control pests present in or occurring on wood. The composition of the present invention replaces bromomethane, thereby minimizing environmental pollution, ensuring uniform diffusion of the composition, and having excellent control efficiency.

An oral care composition is provided and includes a natural flavor extract, a sulfur source such as dimethyl disulfide, a stannous ion source, and a soluble metal ion source that prevents the formation of methyl mercaptan. The natural flavor extract may contain dimethyl disulfide as an impurity. The soluble metal ion source may include a metal salt, a metal oxide, or a combination thereof, and the soluble metal ion source may include a copper ion source, a silver ion source, a zinc ion source, or combinations thereof.

The application provides a preparation method of methyl sulfonic acid, which is obtained by reacting raw material dimethyl disulfide with nitrogen oxide, air and water in a certain proportion. The method has high raw material utilization rate, is green and environment-friendly, and is easy to be industrialized. By controlling the content of methyl methyl sulfonate and 1-methyl-2-((methylsulfonyl) methyl) disulfane in the dimethyl disulfide, the colority of the separated product is lower, and the melting range of the product is narrower.

The invention relates to the technical field of chemical preparation, and discloses a process for preparing lithium sulfide through hydrogenation of dimethyl disulfide or di-tert-butyl polysulfide, which comprises the following steps: preparation of hydrogen sulfide: in a first reactor, carrying out hydrogenation reaction on an organic sulfur source and hydrogen in the presence of a hydrogenation catalyst to generate hydrogen sulfide mixed gas; the organic sulfur source is dimethyl disulfide or di-tert-butyl polysulfide; synthesis of lithium sulfide: introducing the hydrogen sulfide mixed gas into a second reactor filled with lithium source slurry for reaction to generate lithium sulfide; the lithium source slurry comprises a lithium source and a cosolvent; the lithium source is lithium hydroxide or lithium carbonate. A two-step process of hydrogen sulfide preparation and lithium sulfide synthesis separation is adopted, hydrogen sulfide is prepared by hydrogenation of an organic sulfur source in the first reactor and then conveyed to the second reactor to participate in synthesis, high-purity lithium sulfide is obtained through the scheme, and the content of polysulfide is extremely low.

The invention discloses sinorhizium xinjiangense APXJHT24-1 which has the functions of promoting growth and inhibiting aspergillus flavus, and the preservation number of the sinorhizium xinjiangense APXJHT24-1 is CCTCC (China Center for Type Culture Collection) M 2026229. According to the invention, the integration of two major functions of'generation of a characteristic antibacterial volatile matter of dimethyl disulfide 'and'efficient symbiotic nitrogen fixation' on a single strain is realized in Sinkiang Sinkiang rhizobium for the first time. The dimethyl disulfide released by the strain can accurately down-regulate expression of toxin synthesis key genes and spore development core genes in the aspergillus flavus, so that efficient bacteriostasis is realized on the molecular level. Through one-time inoculation, the strain can synchronously achieve the dual purposes of growth promotion and nitrogen fixation and source bacteriostasis at the rhizosphere ecological niche of the peanuts. Especially aiming at the biological characteristics of overground flowering and underground fruiting of peanuts, a lasting biological fumigation protection layer can be formed in a soil microenvironment in a legume development critical period.

The present application relates to a kind of pentose pediococcus and the preparation method of fermented whey.The present application provides a kind of pentose pediococcus IF2, on December 31, 2025, is preserved in Guangdong Microbial Culture Collection Center, and the preservation number is GDMCC No:67584.The strain is isolated from Xinjiang yogurt, with good whey adaptability and flavor promotion capacity.After the single bacteria fermentation whey, the content of dimethyl disulfide, dimethyl trisulfide in whey can be significantly reduced, while the content of acetaldehyde and other flavor compounds is greatly improved, and fermented whey is given apple fragrance.Sensory evaluation shows that the overall preference score of fermented whey can reach 4.6 points, and the flavor is significantly improved.

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 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 present invention relates to a polyacrylic acid (salt)-based super absorbent polymer having a surface area–to–apparent volume ratio of 45 mm-1 or more and exhibiting a deodorization rate of 40% or more for dimethyl disulfide (DMDS) or dimethyl trisulfide according to the following Equation 1. [Equation 1] Deodorization rate (%) = (1 x Cs / Co) x 100 (In Equation 1, Cs is a peak area of an odor standard substance in a gas chromatography-mass spectrometry (GC-MS) graph for an odor standard substance solution that has been in contact with a super absorbent polymer at 35°C for 2 hours, and Co is a peak area of an odor standard substance in a gas chromatography-mass spectrometry graph for an odor standard substance solution that has been in contact with a control group at 35°C for 2 hours.)

The present application belongs to the technical field of pesticide preparation, and provides a dimethyl disulfide granule, a preparation method and application thereof.The present application provides a dimethyl disulfide granule, which comprises molecular sieves, dimethyl disulfide loaded on the molecular sieves and a binder.The molecular sieves are granular solids, and have irregular pores and cavity structures inside the structure; the active ingredient dimethyl disulfide is wrapped in the cavities of the molecular sieves, has small irritating odor and low human exposure risk; and the dimethyl disulfide wrapped in the cavities of the molecular sieves has a slow-release effect, is beneficial to improving the effective period, can reduce the dosage under the condition of the same protection effect, and is beneficial to reducing the environmental pressure.The dimethyl disulfide granule provided by the present application is easy to degrade, friendly to the environment, and has the advantages of storage resistance, convenient use and transportation, and does not need special equipment when used, like the commercially available dimethyl disulfide technical material.

The invention discloses a Karl Fischer moisture determination method for sulfur-containing organic compounds, and belongs to the technical field of chemical analysis. The method comprises the following steps: adding absolute methanol, imidazole and an inhibitor (selected from N-substituted maleimide or acrylate compounds) into a titration system, then adding a sample, and titrating with a pyridine-containing Karl-Fischer reagent to the end point. The inhibitor can effectively capture reducing sulfur species and eliminate interference of the reducing sulfur species on iodine. Experiments show that for sulfur-containing samples such as 2, 2-dimethylthiopropane, dimethyl sulfide, dimethyl disulfide and the like, the deviation reduction rate of the method is more than 60% compared with that of a traditional method; the method is easy and convenient to operate, high in accuracy and suitable for moisture analysis of sulfur-containing organic matter in the fields of petrifaction, pharmacy and the like.

The invention relates to a method preparing a carbonated alcoholic beverage having an ethanol content of 2-12% ABV and a water content of at least 80 wt.%, said method comprising combining: • 0.03-10 parts by weight of beer distillate having an ethanol content of 50-98 wt.% and comprising 200-2,000 mg / kg of amyl alcohols, the beer distillate containing ethyl acetate and amyl alcohols in a weight ratio of ethyl acetate : amyl alcohols of less than 1:30; • 2-30 parts by weight of ethanolic liquid having an ethanol content of 25-100 wt.%; • 0.3-10 parts by weight of fruit juice concentrate; • 0.2-1.2 parts by weight of carbon dioxide; • 60-90 parts by weight of water. The beverage obtained by this method has a unique appealing taste. The beer distillate is an essential component of the beverage. The beer distillate combines a high ethanol content with a high content of amyl alcohols and other beer flavour components having a boiling point in the range of 80-210 °C, such as isoamyl acetate, ethyl caproate, furfural, linalool and dimethyl disulfide.

The invention relates to a method preparing a carbonated alcoholic beverage having an ethanol content of 2-12% ABV and a water content of at least 80 wt.%, said method comprising combining: · 0.03-10 parts by weight of beer distillate having an ethanol content of 50-98 wt.% and comprising 200-2,000 mg / kg of amyl alcohols; · 2-30 parts by weight of ethanolic liquid having an ethanol content of 25-100 wt.%; · 0.3-10 parts by weight of fruit juice concentrate; · 0.2-1.2 parts by weight of carbon dioxide; · 60-90 parts by weight of water. The beverage obtained by this method has a unique appealing taste. The beer distillate is an essential component of the beverage. The beer distillate combines a high ethanol content with a high content of amyl alcohols and other beer flavour components having a boiling point in the range of 80-210 °C, such as isoamyl acetate, ethyl caproate, furfural, linalool and dimethyl disulfide.

An oral care composition is provided and includes a hops extract, where the hops extract includes dimethyl disulfide, a stannous ion source, and a stabilizing system including a Michael acceptor. The Michael acceptor has an alpha, beta-unsaturated carbonyl group. The alpha, beta-unsaturated carbonyl group can include an aldehyde, a ketone, a cyclic ketone, or a combination thereof.

The present application relates to the technical field of microbial strains and the technical field of soybean seed coat fermentation, in particular to a Pediococcus sp. of Pteropus sp. and application thereof in improving the flavor of soybean seed coat, wherein the Pediococcus sp. of Pteropus sp. is Pediococcus sp. of Pteropus sp. BL-2 (Lactococcus petauri BL-2) , which is preserved in China Center for Type Culture Collection with a preservation number of CCTCC NO: M 20252253. The Pediococcus sp. of Pteropus sp. BL-2 of the present application not only has significant antioxidant activity, but also can significantly increase the content of 3-hydroxy-2-butanone (acetoin) with a pleasant buttery flavor in soybean seed coat and significantly reduce the content of isovaleric acid, 2-methyl-2-pentenal and dimethyl disulfide and other substances with strong irritating odor after fermentation of soybean seed coat, thereby effectively improving the flavor of soybean seed coat.

This invention discloses a method for preparing methanesulfonic acid with low sulfate residue. The method includes the following steps: in a batch reactor, using dimethyl disulfide with a dimethyl polysulfide content of less than 350 ppm, preferably less than 220 ppm, as raw material, the reaction is carried out in the presence of a catalyst and an oxidant; after the reaction is terminated, the reaction solution is post-treated to obtain methanesulfonic acid. This invention solves the problem of high sulfate content in the product methanesulfonic acid by controlling the dimethyl polysulfide content in the raw material, resulting in a higher quality product and a significant reduction in the content of heavy component impurities. This not only improves the product yield but also simplifies the deweighting process or reduces energy consumption.

The invention discloses a low-temperature lithium-sulfur battery based on monatomic catalysis and organic sulfur electrolyte and a preparation method of the low-temperature lithium-sulfur battery. The low-temperature lithium-sulfur battery comprises a lithium negative electrode, a sulfur-carbon positive electrode, an organic sulfur added electrolyte and a monatomic catalyst modified diaphragm, and organic sulfur comprises dimethyl disulfide, tert-butyl disulfide, diphenyl disulfide, p-p-toluene disulfide, bis (2-nitrophenyl) disulfide, dibenzyl disulfide, diallyl disulfide, 4, 4 '-dipyridyl disulfide, 2, 2'-dithiobipyridine, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 The low-temperature lithium-sulfur battery is one or more of 1, 1 '-dithiobis (caprolactam), 3, 3'-dithiobis (1-propanesulfonic acid) disodium salt, 2, 2 '-[dithiobis (methylene)] difuran, 3, 3'-dithiobis (propionitrile) and carbon disulfide. And the organic sulfur is added into the electrolyte to generate an intermediate product organic polysulfide through interaction between the organic sulfur and the polysulfide so as to realize depolymerization of polysulfide clusters in a low-temperature environment.

The invention relates to the technical field of hydrogenation catalyst sulfuration, and particularly discloses a sulfuration method of a hydrogenation catalyst. The vulcanization method comprises the following steps: S1, dispersing dimethyl disulfide and an additive in cyclohexane to obtain vulcanized oil; s2, filling a hydrogenation catalyst, heating and drying in a nitrogen atmosphere, injecting vulcanized oil, heating and vulcanizing, vulcanizing in three stages, naturally cooling to 140-150 DEG C, switching nitrogen purging, cooling to room temperature, and storing the catalyst for later use; compared with the prior art, according to the vulcanization method, the additive is added to play a bridging role in the vulcanization process, the vulcanization effect is improved, and therefore the stability of the overall catalytic activity is guaranteed.

The present application relates to a kind of converter gas desulfurization purification process.Converter gas raw gas is first treated by TSA, then enters hydrolysis desulfurization tower for desulfurization;Desulfurized gas enters deoxidation reactor for deoxidation, and the purified gas after deoxidation is divided into two parts, one part is pressurized by circulating fan and goes to beat cycle;One part is cooled to 40 DEG C after converter gas heat exchange, water cooling and goes to decarburization;The gas after decarburization is directly into desulfurization tower to remove trace COS, CS2, then enters fine desulfurization tower to remove trace mercaptan and dimethyl disulfide.By this process, it can meet the technical requirements of sulfur content less than 0.1mg / Nm 3 , oxygen content is less than 30ul / L, the process has the characteristics of simple flow, high desulfurization purification degree, low investment and operating cost.

A method for producing methylsulfonic acid with a low sulfate residue, comprising the steps of: reacting dimethyl disulfide, which has a dimethyl polysulfide content of less than 350 ppm, preferably less than 220 ppm, as a raw material in a kettle reactor in the presence of a catalyst and an oxidizing agent; and, after the reaction is complete, post-treating the reaction solution to obtain methylsulfonic acid. By controlling the dimethyl polysulfide content in the raw material, the problem of high sulfate content in the methylsulfonic acid product can be solved, resulting in a high-quality product with a significantly reduced heavy impurity content. This not only improves the product yield but also contributes to simplifying the heavy impurity removal process and reducing energy consumption.

This invention discloses a process for improving the yield strength of wind turbine main shafts. The chemical composition of the main shaft steel, by mass percentage, includes: C 0.38–0.45%, Si 0.20–0.40%, Mn 0.50–0.80%, Cr 0.90–1.20%, Mo 0.15–0.25%, Ni 0.40–0.60%, Cu≤0.05%, P≤0.010%, S≤0.002%, O≤0.0015%, N≤0.006%, H≤0.0002%, with the balance being Fe and unavoidable impurities. The tempering method includes normalizing pretreatment, austenitizing heating, pre-cooling treatment, PAG quenching liquid staged cooling, and tempering. During the tempering stage, a nitrogen-ethanol-dimethyl disulfide mixed atmosphere is pulsedly injected into the furnace. After the dimethyl disulfide decomposes at high temperature, it reacts with Mn in the steel to form a dispersed MnS nano-precipitate phase on the surface. This invention enables the main shaft steel to achieve a room temperature yield strength ≥750 MPa, an impact energy ≥150 J at -40℃, and excellent resistance to hydrogen-induced cracking, thus meeting the long-term use requirements of large-megawatt offshore wind turbines under complex operating conditions.

Preferred compounds include di-n-propyl disulfide, di-methyl disulfide, di-ethyl disulfide, di-isopropyl disulfide, di-n-butyl-disulfide, di-benzyl disulfide, di-ethyl sulfide, di-n-propyl sulfide, di-isopropyl sulfide, di-n-butyl sulfide, di-phenyl sulfide, di-benzyl sulfide, di-n-propyl trisulfide, di-n-propyl sulfone, di-benzyl thiosulfinate, di-benzyl thiosulfonate, di-isopropyl thiosulfonate, di-n-propyl thiosulfonate (PTSO), and di-n-propyl thiosulfinate (PTS).

The invention provides a methyl mercaptan oxidation catalyst and a preparation method thereof, and the method comprises the following steps: treating attapulgite powder with a strong alkali solution, and roasting to obtain purified attapulgite powder; preparing an active metal precursor solution, wherein active metal comprises alkaline earth metal, cerium and rare earth metal; dipping the purified attapulgite powder in an active metal precursor solution, and roasting to obtain catalyst powder; and mixing the catalyst powder with a binder, shaping, and carrying out secondary roasting to obtain the methyl mercaptan oxidation catalyst. The methyl mercaptan oxidation catalyst provided by the invention can effectively catalyze and oxidize methyl mercaptan to produce dimethyl disulfide, and is high in catalytic efficiency and high in product yield; meanwhile, the catalyst disclosed by the invention has certain water resistance, and can prevent moisture in feed gas from influencing the yield of dimethyl disulfide.

The present application relates to a preparation method of etelcalcetide hydrochloride, the preparation method comprising the following steps: step 1: synthesizing D - acetyl cysteine - L - Boc-cysteine methyl disulfide - D - alanine tripeptide compound; step 2: synthesizing D - Pbf-arginine amide - D - alanine - D - Pbf-arginine - D - Pbf-arginine - D-Pbf-arginine pentapeptide compound; step 3: synthesizing D - acetyl cysteine - L - Boc-cysteine methyl disulfide - D - alanine tripeptide compound and the D - Pbf-arginine amide - D - alanine - D - Pbf-arginine - D - Pbf-arginine - D - Pbf-arginine pentapeptide compound to obtain etelcalcetide precursor by liquid phase condensation; step 4: the etelcalcetide precursor is obtained by deprotection, hydrolysis and salt conversion to obtain etelcalcetide hydrochloride. The preparation method of the present application is simple in operation, low in cost, high in directional conversion rate, friendly to environment, high in product yield and purity.

The invention discloses a method for detecting methyl methylthiosulfonate in methanesulfonic acid, which comprises the following steps: hydrolyzing methyl methylthiosulfonate to generate methyl mercaptan, oxidizing the methyl mercaptan into dimethyl disulfide, and detecting whether the methanesulfonic acid contains methyl methylthiosulfonate and the content of methyl methylthiosulfonate according to the recovery rate of the dimethyl disulfide. The detection method is simple, methyl mercaptan is directionally generated from methyl methylthiosulfonate under the alkaline mild condition, side reactions are few, the reaction conversion rate is easy to control, methyl mercaptan can be precisely dimerized into dimethyl disulfide under the mild oxidizing agent, no excessive chemical degree oxidation by-products exist, and the method is suitable for industrial production. Whether methyl thiosulfonate exists in methanesulfonic acid or not and the content of methyl thiosulfonate can be accurately detected.

The invention discloses an efficient dimethyl disulfide rectification separation device, and belongs to the technical field of rectification separation. Aiming at the problem that the internal structure of a light component removal tower in the existing product is easily blocked by impurities and needs to be frequently maintained, the invention provides the following technical scheme: the light component removal tower comprises two rectifying tower units, a filter main body and a tower bottom conveying pump main body, the rectifying tower unit on the left side serves as a light component removal unit, and the rectifying tower unit on the right side serves as a refining unit. The liquid collecting mechanism is arranged to replace an existing liquid collector, a retention plate is arranged on the liquid collecting mechanism and used for reinforcing retention of impurities mingled in liquid, a sleeve is arranged in a hole for liquid passing, a hole is formed in the high position of the sleeve, so that the liquid passes at the high position, a spraying piece is arranged upwards in the liquid distribution mechanism, and the liquid distribution efficiency is improved. Therefore, the service life of the equipment is prolonged, the manual maintenance frequency is reduced, the burden of workers is relieved, and the product processing efficiency of the equipment is improved.

The invention relates to chive liquid essence and a preparation method thereof, and belongs to the technical field of food essence. According to the essence, chive is used as a raw material, chive extract oil is prepared by adopting an ultrasonic extraction technology, and then the chive extract oil is blended with a chive fragrance module, a spicy fragrance module and a vegetable module according to a certain proportion. Wherein the scallion fragrance module comprises the following components: dimethyl sulfide, propanethiol, dimethyl disulfide, hexanal, dimethyl trisulfide, phenethyl alcohol, nonanal, dipropyl disulfide, dipropyl trisulfide, 2-tridecanone, 2, 4-decadienal, 3-sulfydryl-2-methyl amyl alcohol and the like; the scallion fragrance module comprises the following components: dimethyl sulfide, propanethiol, dimethyl disulfide, hexanal, dimethyl trisulfide, phenethyl alcohol, nonanal, dipropyl disulfide, dipropyl trisulfide, 2-tridecanone, 2, 4-decadienal and 3-sulfydryl-2-methyl amyl alcohol; the spicy module comprises star anise essential oil, pepper essential oil, coriander essential oil, cinnamon oil, clove essential oil, garlic oil, ginger oil and the like; the vegetable module mainly comprises celery essential oil and onion oil. The essence prepared by the invention is natural and soft in fragrance, outstanding in characteristic fragrance, high in fidelity and lasting in fragrance, and is suitable for the development of chive fragrance supplementation and related flavor foods.

The invention discloses a solvent-free preparation method for catalyzing dimethyl thio-toluenediamine in the field of organic chemical synthesis and catalysis, which comprises the following steps: drying an amine raw material of dimethyl thio-toluenediamine, mixing with dimethyl disulfide under the protection of inert gas, adding a polyoxometallate functionalized magnetic mesoporous carbon nanosphere catalyst, and reacting at the temperature of 60-80 DEG C for 1-2 hours, thereby obtaining the dimethyl thio-toluenediamine catalyst. And carrying out solvent-free catalytic reaction at a specific temperature. After the reaction is finished, the catalyst is separated through a magnetic field, a product is washed and distilled to obtain a high-purity product, and the separated catalyst can be recycled after being washed, calcined and regenerated. The preparation method of the catalyst comprises the following steps: preparing magnetic mesoporous carbon nanospheres through a hydrothermal method and carbonization, then carrying out amino functional modification, bridging covalently immobilized phosphomolybdic acid polyoxometallate through epoxy silane, and finally treating through a zinc-copper bimetal solution to obtain the final catalyst. The solvent-free green synthesis is realized, the catalyst has the advantages of high activity and easiness in separation, and the whole process is environment-friendly and efficient and is suitable for industrial production of the polyurethane chain extender.

An oral care composition is provided and includes a natural flavor extract, a sulfur source such as dimethyl disulfide, a stannous ion source, and a soluble metal ion source that prevents the formation of methyl mercaptan. The natural flavor extract may contain dimethyl disulfide as an impurity. The soluble metal ion source may include a metal salt, a metal oxide, or a combination thereof, and the soluble metal ion source may include a copper ion source, a silver ion source, a zinc ion source, or combinations thereof.