325 results about "Dimethyl disulfide" patented technology

The invention relates to a method for selective hydrogenation of reforming generated oil. According to the reforming generated oil, the bromine index is 7270mgBr / 100g oil, and the weight of arene is 66.83%; the reaction conditions are as follows: the reaction temperature is 170 DEG C, the hydrogen partial pressure is 1.6MPa, the speed of liquid is 4h<-1> and the volume ratio between hydrogen and oil is 200. The method is characterized in that the used catalyst is Pd / gamma-Al2O3 containing 0.3wt% of palladium, and is passivated by a dry method with sulfur-containing compounds such as dimethyl disulfide, methyl thioether, butyl mercaptan or hydrogen sulfide before being filled; the added amount of the sulfide for passivation is as follows: the molar ratio of the palladium and the sulfur is 1-3.5; and the passivation temperature ranges from normal temperature to 230 DEG C. The method has the advantages that the pollution can be reduced, the investment can be reduced, convenience is brought for starting operation; after the palladium catalyst is passivated by the sulfide, the loss of arene of a hydrorefined product is lower than 0.5% (weight); after short-time reaction, the bromine index of the product is lower than 100 and the requirement of arene extraction for the raw materials can be met.

The present invention is directed to methods and compositions for the prevention of citrus greening disease. In one embodiment, there is provided a method for repelling or killing insect vectors of citrus greening disease comprising exposing the vectors to an effective amount of at least one volatile compound set forth in Tables 1 and 2 herein. In one embodiment, the volatile compound is dimethyl disulfide.

This invention pertains generally to the field of chemical synthesis and purification, and more specifically to methods of synthesizing and purifying certain 3,7-diaminophenothiazin-5-ium compounds (referred to herein as “diaminophenothiazinium compounds”) including Methythioninium Chloride (MTC) (also known as Methylene Blue). In one embodiment, the method comprises the steps of, in order: nitrosylation (NOS); nitrosyl reduction (NR); thiosulfonic acid formation (TSAF); oxidative coupling (OC); Cr(VI) reduction (CR); isolation and purification of zwitterionic intermediate (IAPOZI); ring closure (RC); chloride salt formation (CSF); one of: sulphide treatment (ST); dimethyldithiocarbamate treatment (DT); carbonate treatment (CT); ethylenediaminetetraacetic acid treatment (EDTAT); organic extraction (OE); and recrystallisation (RX). The present invention also pertains to the resulting (high purity) compounds, compositions comprising them (e.g., tablets, capsules), and their use in methods of inactivating pathogens, and methods of medical treatment and diagnosis, etc., for example, for tauopathies, Alzheimer's disease (AD), skin cancer, melanoma, viral diseases, bacterial diseases, or protozoal diseases.

The invention relates to a soil fumigant, namely dimethyl disulfide ( another name: dimethyl disulfide, methyl disulfide, dimethyl disulfide, DMDS, C2H6S2), which is applicable to the control of crops such as vegetables, strawberries, flowers, melons, orchards, vineyards, and Chinese herbal medicines, and can effectively kill eelworms, soil-borne pathogenic fungi, weeds, underground pests, and the like in the soil. The dimethyl disulfide can be processed into missible oil, and the missible oil is applied in the field through drip irrigation; a raw medicine can be directly applied by an injection method; and the raw material can be processed into capsules to be directly used in the field.

This invention is directed to an synergistic antimicrobial composition which comprises a mixture of an iodopropynyl compound and a dimethyldithiocarbamate compound, said mixture provided in an amount sufficient to protect a substrate from attack by one or more microbial organisms. The composition can be used broadly in industrial systems and more particularly with substrates such as paints, coatings, plastics, wood and wood composites.

A method for producing a palatability enhancer for a companion animal food product, wherein the method includes combining at least one aroma chemical selected from 2-methylfuran, 2-methylpyrrole, 2-methyl-thiophene and dimethyl disulfide with an animal or vegetarian digest composition. Companion animal food products containing the palatability enhancer are also disclosed.

The invention discloses a method for removing dimethyl disulfide through oxidation, which is used for removing dimethyl disulfide in liquid fuel or liquefied gas, belonging to the technical field of oil processing. The method is characterized in that titanium silicalite molecular sieves and heteropoly acid or organic acid are taken as catalysts, and the mol ratio of the titanium silicalite molecular sieves, heteropoly acid or organic acid to a sulfide is 4 : 1-16 : 1; dimethyl is dioxidized, and solid absorbent is simultaneously used for absorbing oxidization product of the dimethyl disulfide, or a solvent is used for extracting the oxidization product of the dimethyl disulfide, thereby removing the dimethyl disulfide. The method has the advantages that the desulfurization rate of the dimethyl disulfide in the liquid fuel or the liquefied gas reaches 92.98 percent due to the adoption of the method, the content is 290.3 mg / m<3>, the reaction conditions are mild, and the operation is simple.

The invention discloses a gas purification method for treating low-concentration organic compounds, in particular to a gas purification method aiming at the following malodorous compounds such as sulfides of dimethyl sulfide (DMS), dimethyl disulfide (DMDS), sulfurated hydrogen (H2S) and the like as well as formaldehyde, acetic acid, isopropyl alcohol, acetone and the like. The method comprises: at least one catalyst adsorption unit in parallel connection and / or in series connection; and / or an ozone generating unit which can provide ozone to the catalyst adsorption unit to serve as a component that can strengthen the adsorption function of catalyst and is easy to be treated or is harmless after low temperature oxidation reduction or decomposition reaction, so as to greatly improve the treatment efficiency and extend the service life of the catalyst adsorption material.

A method for integrated treatment of electroplating wastewater includes steps of: adjusting and maintaining pH of wastewater at 10.5-12; oxidizing pollutants such as sodium cyanide and hydroxyl-containing organic amine complexants with sodium hypochlorite; precipitating carboxyl-containing organic acid complexants with synergistic effect of ferrous and calcium ions; reducing hexavalent chromium to trivalent chromium and forming chromium hydroxide precipitate; removing precipitate by filtering; adjusting wastewater to pH of 4.5-5.5; precipitating heavy metal ions with sodium dimethyldithiocarbamate or sodium diethyldithiocarbamate; adsorbing precipitate and heavy metal capturing agents with activated carbon; filtering to remove precipitate; adjusting wastewater to pH of 6-8; and destroying aliphatic polyamine complexants and reducing COD using an available biological degradation technique. This method can effectively and economically remove the pollutants such as heavy metals in the electroplating wastewater for a good market prospective.

The present invention discloses a method for producing dimethyl disulfide by using a methyl mercaptan oxidation method. According to the method, methyl mercaptan, nitrogen dioxide, sulfur trioxide, nitric acid, hydrogen peroxide, oxygen, sulfur, and other oxidizing agents are adopted as raw materials, measures of cooling, stirring, separation, rectification, and the like are performed to obtain the reaction product dimethyl disulfide. According to the present invention, a new approach is provided for the raw materials for preparing the target product, and substantial social benefits and economic effects are provided for reduction of product cost, comprehensive utilization of resources, and reduction of environmental pollution.

The invention relates to a composition for soil fumigation, the effective components of which are allyl isothiocyanate (A) and dimethyl disulfide (B) in a mass ratio of 1:1-1:100. The composition provided by the invention is used for soil fumigation of melons and vegetables, medicinal materials, strawberries, tobacco, fruit trees, and nurseries.

The invention discloses a flame-retardant cable material. The flame-retardant cable material comprises the following components in parts by mass: 80-100 parts of low-density polyethylene resin, 40-60 parts of PVC resin, 50-60 parts of an aluminum hydroxide flame retardant, 1-2 parts of a coupling agent, 6-8 parts of melamine cyanurate, 2-3 parts of dimethyl disulfide, 6-10 parts of dioctyl phthalate, 0.1-0.3 part of an ultraviolet light absorber, 10-15 parts of active nano calcium carbonate, 4-6 parts of paraffin, 0.2-0.4 part of stearic acid and 2-4 parts of epoxidized soybean oil. The flame-retardant cable material is non-toxic and environmentally-friendly, is high in heat stability, easy to process, excellent in mechanical property, high in strength, high in temperature resistance grade, low in cost and excellent in flame-retardant property, and is applicable to large-scale industrial production.

The invention discloses an atomic layer deposition preparation method for a large-area molybdenum disulfide film. The atomic layer deposition preparation method for the large-area molybdenum disulfidefilm is characterized in that molybdenum hexacarbonyl (Mo(CO)6) and dimethyl disulfide (C2H6S2) are used as precursor sources of molybdenum and sulfur for atomic layer deposition (ALD), a conventional atomic layer deposition device is adopted, and the large-area molybdenum disulfide film is obtained by optimizing reaction parameters. Based on the superiority of the atomic layer deposition technique, the film prepared through the method has the characteristics of large area, good compactness, excellent performance, stable deposition speed, controllable thickness and the like, the quality of the film can be improved, and the application of the molybdenum disulfide film is further enhanced and widened.

The invention relates to a chemical absorbent, in particular to a chemical absorbent for deodorization. In order to overcome the technical problem, the invention proposes the technical scheme that the chemical absorbent consists of the following components in parts by weight: 10-20% of strong base, 5-7% of oxidant,0.2-0.5% of active agent, 0.05-2% of corrosion inhibitor, 0.05-2% of pour point depressant, 0.05-8% of desulfurizer, 0.05-4% of catalyst and 60-80% of water. The chemical absorbent has the advantages of overcoming the low removal rate of pure alkaline liquor to hydrogen sulfide in the prior art, improving the absorptivity of sulfur compounds in waste gas and removing organic sulfur, such as sulfur alcohol, sulfur ether, dimethyl disulfide, and the like. The waste residue of sodium sulfide which is generated after treatment is relatively stable and is easy to decompose, thereby avoiding secondary pollution. The chemical absorbent has longer use time than the traditional absorbent and high reaction speed in removing the sulfur compounds.

Gas streams containing non-condensible gases (NCG's) including reduced sulfur compounds, such as hydrogen sulfide, dimethyl sulfide, dimethyl disulfide and mercaptans, are treated to remove the NCG's from the gas stream. Following an optional initial gas-liquid contact to cool the gas stream to its adiabatic dewpoint and to remove particulates, the gas stream is subjected to an intimate gas-liquid contact with aqueous chlorine dioxide, in one or more contact stages, to oxidize the reduced sulfur compounds and other oxidizable compounds present in The gas stream and then the gas stream is passed through an entrainment separator to remove entrained liquid droplets. Acidic gases produced in the oxidization stage and residual chlorine dioxide generally are removed from the gas steam by intimate gas-liquid contact of the gas stream with an aqueous neutralizing and reducing solution, in one or more contact stages, and ten the gas stream is passed through an entrainment separator to remove entrained liquid droplets.

The invention provides a highly-efficient blockage remover for a sulfur-containing gas well. The highly-efficient blockage remover is composed of the following components: 10% to 35% of a high-boiling-point main agent, which is used for dissolving organic obstructions and is composed of ethylene glycol monomethyl ether, ethylene glycol, dimethylformamide, ethylene glycol phenyl ether, petroleum ether and dodecanol; 5% to 10% of an emulsifier, which is compounded from a condensate of fatty alcohol and ethylene oxide, polyoxyethylene sorbitan fatty acid ester and sorbitan fatty acid ester; 7 % to 15% of a surfactant, which is composed of sodium fatty alcohol polyoxyethylene ether sulfate, sodium dodecyl benzene sulfonate, AMALF-32, glyceryl monostearate and polyglyceryl distearate; 5% to 15%of a sulfur-dissolving agent, which is compounded from dimethyl disulfide and diaryl disulfide; 1% to 5% of a metal chelating agent, which is ethylenediaminetetraacetic acid; 8% to 15% of a dispersant, which is a naphthalene sulfonate sodium salt formaldehyde condensate; 3% to 5% of an antioxidant, which is n-octadecanol propionate; 2% to 6% of a scale inhibitor; and a proper amount of an acidity and alkalinity regulator, which is used for regulating a pH value. The blockage remover provided by the invention can resist a temperature of 140 DEG C or above, has an obstruction dissolution rateup to 96%, and has good blockage remover performances to the sulfur-containing gas well in a high-temperature environment.

The primary aspect of the Controlled Odor Mimic Permeation System (COMPS) is that it provides a field deployable instant and reproducible source of known amounts of target odors. This technology consists of a permeable polymer container (chosen to suit target odor and release rate required), stored inside a non-permeable package. The design allows for the pre-equilibration of the target odors such that the outer surface of the inner package can saturate with odor during storage. Removal of the inner item then provides an instant and reproducible source of known target vapor flux. We have successfully demonstrated this technology by placing the target odor chemicals within permeable membranes such as low density polyethylene which are then sealed within a non-permeable membranes such as metallized polyester. This design has multiple advantages including preventing cross contamination when storing multiple odor targets (5-10 targets are commonly employed) as well as being light-weight disposable, low unit cost potential, no external power / operating unit / machinery / hardware, simple to use and providing a known reproducible concentration of the target odors to the detector in the field. The applications of these COMPS include the whole range of biological (e.g. detector dog) and electronic (e.g. field sensors) detectors with examples such as explosives (e.g. 2-ethyl-1-hexanol simulating plasticized explosives), drugs (e.g. 3,4-methylenedioxybenzaldehyde simulating ecstasy), human remains (including dimethyl disulfide and pentanoic acid) and live human scent (including 5-heptene-2-one and nonanol).

The invention provides a farm chemical composition and application thereof. The farm chemical composition comprises the active components of dimethyl disulfide and allyl isothiocyanate. The farm chemical composition is used for disinfecting soil of crop fields for vegetables, strawberry, flower, melons, Chinese herbal medicines and the like and soil of a nursery, an orchard, a tea garden and a forest before sowing, and can effectively prevent and control root knot nematodes, soil-borne pathogenic fungi, soil-borne pathogenic bacteria and common farmland weeds during agricultural crop planting, especially the root knot nematodes, fusaria and abutilon theophrasti. The farm chemical composition has the benefits as follows: (1) the farm chemical composition has an unexpected synergistic effect within a certain proportion range, so that nematode-killing, bactericidal and weeding effects of the farm chemical composition are obviously better than those of a single component, the using dosage of farm chemicals, the farm chemical delivering labor and the farm chemical delivering cost are reduced, and the adverse effect on the environment and farm chemical residues are reduced; (2) the farm chemical composition has a wide prevention and control spectrum, and can be widely used for preventing and controlling soil-borne pathogenic nematodes, soil-borne pathogenic bacteria and weeds during agricultural crop planting.

The invention relates to a preparation method of a polyether diol. The polyether diol has a structure shown in the formula 1. The preparation method can design products having different molecular weights according to demands. The preparation method comprises the following steps that trimethylolpropane and an aldehyde or a ketone undergo an aldolization (ketalation) reaction to produce a compound (3); ethylene oxide is polymerized into a polyether monoalcohol in the presence of the compound (3) as an initiator; the polyether monoalcohol and dimethyl sulfate or dimethyl carbonate or a haloalkane undergo a Williamson reaction to produce a methyl-terminated polyether product; and the methyl-terminated polyether product undergoes a ring-opening reaction to produce polyether diol. The preparation method has the advantages of simple processes, high efficiency, low raw material cost, wide raw material sources and good industrialization prospect.

The invention discloses an efficient sulfur solving agent for sulfur deposits in a sulfur-containing gas well, relating to the field of the sulfur solving agent. The efficient sulfur solving agent is composed of dimethyl disulfide, sodium hydroxide aqueous solution, sodium bisulfide and N, N-dimethylformamide. The efficient sulfur solving agent is high in sulfur solving capability, high in sulfur solving speed and low in cost, and thereby can be widely applied to sulfur solving of sulfur deposits in the well tube of a high sulfur-containing gas well and a surface pipeline. At 25 DEG C, 1 g of sulfur solving agent is capable of solving 1.62 g of sulfur and the time of solving is only 2.27 min; therefore, the sulfur solving effect of the efficient sulfur solving agent is obviously superior to that of the sulfur solving agent in the prior art.

The invention relates to a production method for dimethyl disulfide. The production method comprises the following steps: subjecting methyl mercaptan and strong base to reaction so as to generate methanthiol salt, and subjecting methanthiol salt and oxygen-containing gas to oxidation reaction so as to prepare dimethyl disulfide. The method provided by the invention combines a caustic soda liquid absorption method and an oxidation method to realize preparation of dimethyl disulfide, and has the advantages of small explosive range, basically no by-product, high product purity, high yield, etc.

The miticide and pesticide composition containing dimethyl disulfide as one kind of pesticide consists of dimethyl disulfide 0.1-15 wt%, emulsifier 3-20 wt%, and solvent 65-95 wt%; or consists of dimethyl disulfide 0.1-15 wt%, effective component A 0.1-40 wt%, emulsifier 5.0-20 wt%, and solvent 40-90 wt%. The effective component A is at least one of abamectin, pyridaben, diafenthiron, propargite and dicofol; the emulsifier is calcium alkyl benzene sulfonate, polyoxyethylene fatty ester, etc; and the solvent is biodiesel oil, xylene, methanol, etc. The miticide and pesticide composition has the features of high safety, low toxicity, less residue, low cost, high efficiency and broad pesticidal spectrum, and may be used in preventing and controlling mites of crop.

The invention relates to a soil fumigant, namely dimethyl disulfide (another name: dimethyl disulfide, methyl disulfide, dimethyl disulfide, DMDS, C2H6S2), which is applicable to the control of crops such as vegetables, strawberries, flowers, melons, orchards, vineyards, Chinese herbal medicines, and can effectively kill eelworms, soil-borne pathogenic fungi, weeds, underground pests, and the like, in the soil. The dimethyl disulfide can be processed into missible oil, and the missible oil is applied in the field through drip irrigation; a raw medicine can be directly applied by an injection method; and the raw material can be processed into capsules to be directly used in the field.

The invention discloses a method for discriminating the truth of fermented beef ham through detecting the compositions of a flavor substance by a gas chromatography-smelling method / a gas chromatography-mass spectrometry method. The method comprises the following steps: when a sample of a flavor substance of fermented beef ham to be detected is prepared through dynamic headspace purging and trapping, the suitable purging time of nitrogen gas is 30 minutes; when the flavor substance is detected by utilizing the gas chromatography-mass spectrometry method, the fermented beef ham contains fifteen flavor substance compositions: namely, 2-propylene-1-mercaptan, dimethyl benzene methanol, 3-methyl butyraldehyde, benzaldehyde, methyl-5-heptene-2-ketones, acetophenone, alpha-pinene, beta-pinene, styrene, dipentene, biphenyl, naphthalene, 2-methyl naphthalene, phenol, eucalyptus essential oil and anethole; and when the compositions of the smelling flavor substance are detected by the chromatography-smelling method, the fermented beef ham contains trimethyl butyraldehyde, benzaldehyde, dimethyl disulfide, naphthalene, alpha-pinene and benzothiazole. The method can be widely applied to quality detection and discrimination; and the process design, improvement and management of the fermented beef ham.

The invention discloses a method and device for producing dimethyl disulfide through oxidation of methyl mercaptan salt solution. The method comprises the following steps: firstly, methyl mercaptan is inputted into an alkaline solution, a reaction is carried out, a methyl mercaptan salt solution is obtained, then the methyl mercaptan salt solution is reacted with an oxidizing agent to generate a dimethyl disulfide crude product, finally the crude product is purified and refined and a dimethyl disulfide finished product is obtained. The employed raw materials have low toxicity or no toxicity and are cheap and easily available. Through oxidation of a methyl mercaptan salt solution, the safety risk is avoided that methyl mercaptan and oxygen are reacted directly and an explosive mixture is easy to generate.

The invention discloses salted egg yolk essence which is composed of caprylic capric glyceride, dimethyl sulfide, 3-hydroxy-2-butanone, dimethyl disulfide, 1-octylene-3-alcohol, furfural, 5-methyl furfural, 3-methylthiopropanal, 2-acetylpyridine, 3-methyl methylthiopropionate, 2-acetylthiazole, methyl(2-methyl-3-furyl)disulfide, isovaleric acid, 2, 4-decadiene aldehyde, ethyl maltol, 3-methylthiopropanol, caprylic acid, 2, 4-dimethyl-5-acetylthiazole, heliotropin, vanillin, capric acid, 2-pentylfuran, isovaleraldehyde, furanone and 2-acetylpyrazine. The salted egg yolk essence is authentic andfull in fragrance, low in cost, good in fragrance lasting and penetrating in fragrance, has the advantage of being delicious, fragrant and oily and can serve as a food additive to be applied in producing food like bake and beverages.

The present invention relates to a method for producing high-purity methyl sulfonyl chloride by using intermittent process. In the aqueous solution of hydrochloric acid it uses dimethyl disulfur and chlorine gas and makes them produce reaction to produce methyl sulfonyl chloride. Its reaction yield can be up to 97%, and its product purity is greater than or equal to 99.7%.

A process for preparing thiophosphamide from O, O-dimethyl thiophosphamide and trichloroacetaldehyde through preparing the intermediate C, exchanging the sites of O and S in the intermediate by use of dimethyl sulfate (or carbonate), and preparing O, S-dimethyl (2, 2, 2-trichloro-1-hydroxy-ethyl) thio phosphamide. Its advantages are low cost and high purity.