58 results about "Methyl disulfide" patented technology

The invention provides a temperature accurate control and flow state optimization method for replacing dimethyl disulfide with sulfur in a coal tar hydrogenation process, which comprises the following steps: after acquiring a blockage risk distribution diagram, deploying a flow sensor and a pressure sensor at key nodes of a pipeline in combination with real-time monitoring capability, and collecting dynamic data of a sulfur flow state; flow stability parameters are obtained; according to the fluctuation amplitude, adjusted sulfur flow state data are obtained, the flow velocity and viscosity change of sulfur in the pipeline are calculated through fluid mechanics simulation, and the flow state optimization degree is determined; after a process suitability evaluation result is obtained, the operation cost and the economic benefit improvement range of the sulfur substitution scheme are calculated in combination with a cost accounting model, and the cost control effect is judged by comparing the reference cost of dimethyl disulfide; through a cost control effect, a time sequence prediction algorithm is adopted to analyze sustainability of temperature control and flow state optimization in long-term operation, and a comprehensive optimization scheme of production process stability and economy is obtained.

The invention relates to a urine metabolism combined marker for diagnosing bladder cancer and a screening method of the urine metabolism combined marker. The urine metabolism combined marker is prepared from 2-methyl furan, dimethyl disulfide, octylene and acetophenone. The method for screening the urine metabolism combined marker comprises the following steps: carrying out chromatographic separation and mass spectrometry detection on a urine sample on the basis of a headspace automatic sampler in combination with a chromatographic column and a photochemical ionization time-of-flight mass spectrometry, preprocessing mass spectrometry data, and extracting spectrum peak data of metabolites in urine; the urine metabolism combination marker for diagnosing bladder cancer is obtained through further statistical analysis. The screening method of the urine metabolism combined marker for diagnosing the bladder cancer has the advantages of non-invasiveness, high-throughput detection, simplicity in operation and accurate result, and has a wide application prospect.

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 invention relates to the technical field of dimethyl disulfide production, in particular to a dimethyl disulfide production separation device which comprises a separation evaporation tank and a tank cover arranged on the upper end face of the separation evaporation tank, and an impurity cleaning assembly is arranged on the tank cover. Through the arrangement of the impurity cleaning assembly, impurities attached to the inner side wall surface of the separation evaporation tank can be cleaned up and down in a reciprocating manner, and the bottom end of the inner side of the separation evaporation tank can be scraped and cleaned, so that the cleaning range of the inner side wall surface of the separation evaporation tank is large, and the inner side wall surface of the separation evaporation tank is cleaned more thoroughly; impurities attached to the inner side wall surface of the separating and evaporating tank can be subjected to transverse and longitudinal cleaning force, so that the firmly attached impurities can be cleaned, in addition, the inner side wall surface of the separating and evaporating tank can be vibrated, so that the impurities attached to the inner side wall surface of the separating and evaporating tank are loosened, and the separating and evaporating efficiency is improved. Therefore, the cleaning capacity of the impurity cleaning assembly on impurities attached to the inner side wall surfaces of the branch evaporation tanks is improved.

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 application belongs to the technical field of hydrogenation catalysts, and particularly relates to a performance improvement method of a hydrogenation refining catalyst. The performance improvement method of the hydrogenation refining catalyst controls the temperature of a reactor filled with the hydrogenation refining catalyst at 320-370 DEG C, uses aviation kerosene to flush the hydrogenation refining catalyst, and then uses normal industrial oil as a solvent to carry dimethyl disulfide to supplement sulfur to the hydrogenation refining catalyst, so as to improve the performance of the hydrogenation refining catalyst. The performance improvement method of the hydrogenation refining catalyst does not need to be regenerated outside the reactor, controls the pretreatment temperature of the catalyst, flushes the catalyst with aviation kerosene, and adds dimethyl disulfide in the reactor of the catalyst device for closed-loop circulation, so that the performance of the hydrogenation refining catalyst is improved, the influence of the change of the performance of the catalyst on the quality of industrial white oil is avoided, and the industrial white oil has good yellowing resistance.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a dimethyl polysulfide composition and a preparation method and application of dimethyl disulfide. According to the dimethyl polysulfide composition provided by the invention, the content of each component in the composition is specially regulated and controlled, the composition is used as a raw material to react with methyl mercaptan to prepare dimethyl disulfide, the purity is greater than 99.8%, the appearance is colorless transparent liquid, the chromaticity is less than 25 Hazen, and the dimethyl disulfide is free of foul smell and is an environment-friendly superior product; the product can be sold as a food flavor fumigant, and has great market competitiveness. According to the preparation method of dimethyl disulfide provided by the invention, the reaction process is carried out in a protective atmosphere, the technological process is simple, no toxic reagent is used, the operation is safe and non-toxic, and potential safety hazards are avoided.

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 relates to chilli sauce flavor essence as well as a preparation method and application thereof. The essence is prepared from the following raw material components: acetic acid, dimethyl disulfide, ethyl lactate, diallyl disulfide, diallyl trisulfide, allyl methyl disulfide, dimethyl trisulfide, 2-methylbutyric acid, alpha-terpilenol, phenethyl alcohol, phenylpropanol, ethyl caprate, fenugreek lactone, 2-methyl-2-pentenoic acid, linalool, hexanal, eugenol and ethyl caprylate. The chilli sauce is prepared from ethyl maltol, methyl cyclopentenolone, capsicum oleoresin, a chilli sauce Maillard reactant and caprylic capric triglyceride. The chilli sauce flavor essence prepared by the invention not only has the flavor characteristic of chilli sauce, but also has the taste of chilli sauce, and is full and pure in fragrance, high in simulation degree and stable in quality.

The invention discloses crab-flavor essence and a preparation method thereof. The crab-flavor essence is prepared from the following raw materials in parts by mass: 8 to 12 parts of butyl acetate, 5 to 9 parts of dimethyl disulfide, 4 to 7 parts of 2-acetylthiazole, 2 to 5 parts of pyridine, 6 to 10 parts of furfural, 3 to 8 parts of 2-amyl furan, 7 to 11 parts of alcohol compounds, 9 to 14 parts of ketone compounds, 6 to 11 parts of aldehyde compounds and 8 to 13 parts of pyrazine compounds. According to the crab-flavor essence, the alcohol compound, the ketone compound, the aldehyde compound and the pyrazine compound are added into the butyl acetate, the dimethyl disulfide, the 2-acetylthiazole, the pyridine, the furfural and the 2-amylfuran, and the crab-flavor essence which is rich in crab meat fragrance, high in fresh and sweet taste and high in crab meat flavor fidelity is prepared.

The invention relates to a preparation method of entcartide hydrochloride. The preparation method comprises the following steps: step 1, synthesizing a D-acetylcysteine-L-Boc-cysteine methyl ester disulfide-D-alanine tripeptide compound through a liquid phase synthesis method; step 2, synthesizing a D-Pbf-arginine amide-D-alanine-D-Pbf-arginine-D-Pbf-arginine-D-Pbf-arginine pentapeptide compound by virtue of a liquid phase synthesis method, and synthesizing a D-Pbf-arginine pentapeptide compound by virtue of a liquid phase synthesis method; step 3, carrying out liquid phase condensation on the D-acetylcysteine-L-Boc-cysteine methyl ester disulfide-D-alanine tripeptide compound and the D-Pbf-arginine amide-D-alanine-D-Pbf-arginine-D-Pbf-arginine pentapeptide compound, so as to obtain an Itecartide precursor, and carrying out liquid phase condensation on the Itecartide precursor and the D-Pbf-arginine pentapeptide compound, so as to obtain the Itecartide. And step 4, carrying out deprotection, hydrolysis and salt conversion on the itecartide precursor to obtain the itecartide hydrochloride. The preparation method disclosed by the invention is simple to operate, low in cost, high in directional conversion rate, environment-friendly and high in product yield and purity.

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 utility model relates to the technical field of reaction kettles, in particular to a water bath constant-temperature dimethyl disulfide reaction kettle which comprises a constant-temperature water bath mechanism, and the constant-temperature water bath mechanism comprises a water bath shell, an internal water bath cavity, a bottom end constant-temperature heating module and a temperature detection module. Firstly, water in an internal water bath cavity is heated through a constant-temperature heating module at the bottom end, required materials can be conveyed into a mixing bin at the bottom end through a feeding pipe after heating is completed, and then a mixing rod is driven to rotate through a driving motor in a mixing top cover at the upper end; internal materials are fully mixed, the constant-temperature water bath mechanism is matched to improve the reaction efficiency, the temperature of water in an internal water bath cavity is measured through a data transmission temperature measuring pipe in the reaction process, and then temperature data is processed and then put on a display screen so that operators can observe the temperature data conveniently; after the reaction is completed, distillation work can be carried out to remove internal impurities.

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.

The present invention provides a method for identifying the base of Chinese medicine Evodia rutaecarpa based on GC-IMS characteristic odor substances: the sample is subjected to headspace GC-IMS detection, and when the peak volume ratio of 2(E)-hexenoic acid, dimethyl disulfide, 3-methylthiopropanol and methyl 2-methoxybenzoate is 1:(1.4-2.0):(1.4-2.4):(1.7-2.6), it is Evodia rutaecarpa; when its ratio is 1:(0.4-0.9):(0.6-1.0):(0.6-1.2), it is sparse hair Evodia rutaecarpa or stone tiger; then, when the peak volume ratio of cyclopentanone and left-rotating carvone is 5.3-5.7, it is sparse hair Evodia rutaecarpa; when the ratio is 6.2-7.6, it is stone tiger. The method of the present invention is fast, non-destructive, does not require complex sample pre-treatment, is simple, environmentally friendly, has low detection cost, and has intuitive results. It is suitable for quickly, objectively and accurately judging the base of Chinese medicine Evodia rutaecarpa in batches.

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.