61 results about "Dimethyl disulfide" patented technology

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 application belongs to the technical field of organic synthesis, and particularly relates to a preparation method of 5-chloro-2-methyl-4-isothiazoline-3-ketone. N,N'-dimethyl-3,3'-dithiodipropionamide is mixed with ethyl acetate, cooled to 8-10 DEG C, and chlorine is added in stages, and the reaction is continued after the chlorine is passed; the adding mode of the chlorine is as follows: in the first stage, 25-30% of the chlorine is passed in 0.5h while maintaining the temperature of the reaction system at 10-12 DEG C; in the second stage, 25-30% of the chlorine is passed in 1h while maintaining the temperature of the reaction system at 13-14 DEG C; and in the third stage, the remaining chlorine is passed in 1.5h while maintaining the temperature of the reaction system at 15-18 DEG C. The application controls the generation of 5-chloro-2-methyl-4-isothiazoline-3-ketone by controlling the adding amount of the chlorine and the reaction temperature, and improves the yield of 5-chloro-2-methyl-4-isothiazoline-3-ketone.

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 a palladium-copper monatomic alloy doped indium oxide composite material and a preparation method and application thereof, and belongs to the technical field of gas sensitive sensing materials.The method comprises the steps that indium oxide particles are sufficiently and evenly dispersed in water, a copper sulfate pentahydrate solution is added into dispersion liquid, solid-liquid separation and washing are conducted after sufficient ultrasonic stirring, and the palladium-copper monatomic alloy doped indium oxide composite material is obtained; a copper precursor ion modified indium oxide composite structure is obtained; the preparation method comprises the following steps: uniformly dispersing a copper precursor ion modified indium oxide composite structure in water, reducing, dispersing in water, and adding a certain amount of palladium nitrate to obtain the palladium-copper monatomic alloy doped indium oxide composite material. The material can be used as a sensing layer of a resistance-type semiconductor gas sensor, and realizes high-response, high-selectivity and low-cost detection of dimethyl disulfide.

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 discloses a complexing inhibitor for inhibiting redissolution of heavy metal sulfide as well as a preparation method and application of the complexing inhibitor. The complexing inhibitor is prepared by compounding the following three components: a component A which is a metal salt, a component B which is an organic sulfur medicament and a component C which is an organic non-sulfur medicament, wherein the mass ratio of the component A to the component B to the component C is (1-2): (1-3): (2-6); the component A is selected from dithiocarbamate, and the component B is selected from at least one of dithiocarbamate, mercaptobenzothiazole or sodium dimethyl dithiocarbamate; and the component C is selected from at least one of chitosan, polyethyleneimine or 1-hydroxyethylidene-1, 1-diphosphonic acid. The inhibitor is especially suitable for preventing excessive sulfur ions from complexing and dissolving precipitated heavy metal sulfide in industrial wastewater treatment, and effectively controlling the concentration of heavy metal ions to rise.

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 application provides application of n-methyl-n-pentyl thiourea as a collector in a sulfur-oxygen mixed copper-cobalt ore and a synchronous flotation method, and relates to the technical field of flotation. In view of problems of the traditional sulfur-then-oxygen process, such as a complicated process, a complex process, and influence of changes of oxidation and sulfidation rates on the flotation effect of the sulfidized copper-cobalt ore, the application provides a new flotation process and reagent, does not need to use a sulfidation agent for sulfidation, simultaneously floats and sulfidizes and oxidizes the copper-cobalt ore, and simultaneously floats the oxidized and sulfidized copper-cobalt ore by using an activator sodium dimethyl dithiocarbamate and a chelate collector n-methyl-n-pentyl thiourea. The flotation process of the application is simple, efficient, clean and efficient, and provides a new method, a new process and a new way for the flotation of the complex sulfur-oxygen mixed copper-cobalt ore.

This invention relates to the field of organic synthesis technology and discloses an apparatus and method for preparing sodium N,N-dimethyldithiocarbonylpropane sulfonate, comprising a support frame, a drive motor, a drum, a distribution plate, a push rod, and a striking sleeve. When drying is required, the drive motor rotates the drum, causing the raw material to tumble. Preliminary heating is achieved through heating elements. A portion of the raw material falls onto the distribution plate and slides down to the inner wall of the extrusion chamber. During drum rotation, the position of the protrusions on the drum's sidewall changes, causing the extrusion rod to move left and right. As the extrusion rod moves to the left, it pushes the end of the extrusion plate towards the inner wall of the extrusion chamber, crushing and pulverizing the material. The combination of crushing and drying methods ensures the material reaches the required size and achieves better drying results.

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 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 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 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.

Examples of a biocide composition include an activated halogen compound selected from the group consisting of 2,2-dibromo-3-nitrlopropionamide; 2-bromo-2-nitropropane-1,3-diol; and 1,2-dibromo-2,4-dicyanobutane; benzisothiazolin-3-one; a pyridine-N-oxide selected from the group consisting of zinc pyrithione and sodium pyrithione; and a carbamate derivative selected from the group consisting of 3-iodo-2-propynyl butyl carbamate; zinc bis(dimethyldithiocarbamate); and bis(dimethyl carbamoyl) 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, 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 application belongs to the field of gas sensors, discloses a kind of indium oxide composite material based on palladium doping and its preparation method and application, its preparation process is to utilize indium nitrate, anhydrous ethanol, ammonia, deionized water to prepare indium oxide material, then doping palladium ion in indium oxide solution to obtain palladium ion doped indium oxide solution, using sodium borohydride reduction, centrifugal to obtain palladium doped indium oxide composite material, then prepare into gas sensor.The application can effectively solve the problems of high activation energy required for pure indium oxide gas sensor reaction and lack of selectivity of pure semiconductor surface to sulfide by improving the design of key process flow of preparation method, and realizes the detection of dimethyl disulfide gas.

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 invention belongs to the technical field of fermentation engineering, and particularly relates to Wickerhamomyces anomalus JG-WA1 and application thereof in aroma-enhancing fruit wine. A strain of aroma-enhanced Wickerhamomyces anomalus JG-WA1 is screened from distiller's yeast, apple juice is inoculated with the strain for primary fermentation, then saccharomyces cerevisiae is inoculated for secondary fermentation, and the aroma-enhanced fruit wine is prepared. The content of unpleasant odor substances such as acetone, 4-methyl-1-pentanol, 2-butanol, dimethyl disulfide, 3-hexanone and the like with pungent smell of alcohol or mildew odor and the like in the fruit wine is obviously reduced, while the content of 2-pentanol, ethyl propionate, propyl acetate, 3-methyl-2-pentanone, 3-pentene-2-ketone, hexyl hexanoate, ethyl hexanoate, methyl acetate, heptanal, 2-octanone, 2, 3-pentanone, ethyl hexanoate, ethyl hexanoate, methyl acetate, heptanal, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate and ethyl hexanoate is obviously reduced. The content of fruit flavor components such as 2, 3-dimethylpyrazine is greatly increased, the brewed apple wine is obvious in ester flavor and transparent and bright in color, and the flavor quality is obviously improved.

The present invention relates to an improved synthesis of malathion. The presence of an acid facilitates the reaction between O,O-dimethyldithiophosphoric acid (O,O-DMDTPA) and maleate, leading to excellent product yield in a shorter reaction time and with fewer impurities.

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.

Provided is a novel drug-free antifouling coating composition capable of suppressing adhesion of marine organisms and algae to aquatic materials, structures in the sea, fishing nets, and the like. The drug-free antifouling coating composition according to the present invention comprises: a resin (A) which has an acid value of from 0 mgKOH / g to 10 mgKOH / g (inclusive) and a weight average molecular weight (Mw) of from 50,000 to 350,000 (inclusive), and which is one or more resins selected from the group consisting of acrylic resins, acrylic silicone resins, polyester resins, alkyd resins, and alkyd rosin resins; and an adhesion inhibitor (B) that is at least one compound selected from the group consisting of an organosilicon compound and an aliphatic hydrocarbon compound, and does not contain a compound selected from the group consisting of cuprous oxide, bis (2-thio-1-pyridine oxide) copper, and bis (N, N-dimethyldithiocarbamic acid) N, N-dimethyldithiocarbamic acid) N, N-dimethyldithiocarbamic acid (N, N-dimethyldithiocarbamic acid) N, N-dimethyldithiocarbamic acid) N, N-dimethyldithiocarbamic acid). The aquatic organism repellent is at least one selected from the group consisting of N, N '-ethylidene bis (thiocarbamoylzinc thioate) and N, N'-ethylidene bis (thiocarbamoylzinc thioate).