239 results about "Methyl disulfide" patented technology

PCT No. PCT/JP96/00748 Sec. 371 Date Nov. 15, 1996 Sec. 102(e) Date Nov. 15, 1996 PCT Filed Mar. 22, 1996 PCT Pub. No. WO96/29099 PCT Pub. Date Sep. 26, 1996Hydrogen sulfide is dehydrogenated to generate a HS group and an S group. The HS group is oxidized to generate sulfuric acid, which is bonded to a metal. The S group is polymerized with a CH3S group to generate methyl trisulfide or methyl tetrasulfide, which is adsorbed to an adsorbent. Methyl mercaptan is dehydrogenated, for example, to generate a CH3S group. A portion of the CH3S group is oxidized to generate methanesulfonic acid, which is bonded to a metal. Another portion of the CH3S group is polymerized with the CH3S group itself to generate methyl disulfide, at least a portion of which is adsorbed to an adsorbent. Still another portion of the CH3S group is polymerized with the S group to generate methyl trisulfide or methyl tetrasulfide, which is physically adsorbed to an adsorbent. In this manner, malodor components including hydrogen sulfide and methyl mercaptan can efficiently be removed without producing or release of harmful secondary products. A simple-structure, compact deodorizing apparatus including appropriate metal oxide catalyst and an adsorbent material suitable for achieving the above deodorizing functions is incorporated in a toilet bowl.

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.

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.

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 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 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 provides a preparation method of 3, 5-dimethylphenol. According to the method, isophorone is taken as a raw material, halogenated aliphatic hydrocarbon is taken as a homogeneous catalyst, and a stainless steel tube reactor is used for preparing 3, 5-dimethylphenol (MX) through catalytic cracking under a high-temperature gas phase. A mixture containing isophorone, methyl iodide, a bromoethane catalyst, thiophene and a methyl disulfide anti-coking agent flows into the stainless steel tube reactor, and 3, 5-dimethylphenol is prepared through atmospheric pressure cracking at the high temperature of 550-650 DEG C. The catalyst and the anti-coking agent for the method are easy to obtain, the reaction has a few steps, and the environment is protected. Further, the conversion rate of isophorone is higher than 90%, and the yield of MX is higher than 75%.

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 invention discloses a method for continuously producing dimethyl disulfide. The method is characterized in that after being molten, a material sulfur is fed into a dimethyl trisulfide reactor by virtue of a feeding pump so as to react with recycled dimethyl disulfide to generate dimethyl trisulfide; dimethyl trisulfide and methyl mercaptan are feed into a dimethyl disulfide reactor so as to react to generate dimethyl disulfide; a dimethyl disulfide crude product is fed into a separating tank, so that most of hydrogen sulfide is separated out, a liquid-phase product is fed into a rectifying tower, a dimethyl disulfide product is condensed and recycled at a tower top, hydrogen sulfide is exhausted as a non-condensable gas, and the dimethyl disulfide and dimethyl trisulfide in a tower kettle are returned and recycled. A method of enabling dimethyl trisulfide to be excessive is adopted, so that methyl mercaptan is completely converted, separating requirements are lowered and a separating process is simplified, and therefore, not only can the dimethyl disulfide yield be improved to 90%, but also the product purity is up to 99wt%.

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 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 a novel high performance dissolving sulfur agent and a preparing method thereof. The novel high performance sulfur dissolving agent is prepared by co-catalyst with an aromatic structure and a phase transfer catalyst of organic amine according to certain proportion through taking dimethyl disulfide (DMDS) as a main solvent, dimethylsulfoxide (DMSO) as an auxiliary solvent, and organic alkali as a catalyst, due to addition of the co-catalyst and the phase transfer catalyst, the sulfur solubility and sulfur dissolving speed of the system are greatly improved, the sulfur dissolving agent has characteristics of high sulfur solubility and sulfur dissolving speed, and has the advantages of greatly reducing the sulfur solubility while reducing the cost compared with the existing DMDS sulfur dissolving agent.

The invention discloses a composition and a method for controlling root-knot nematodes, soil-borne pathogenic fungi and weeds in the technical field of pesticides. The composition comprises a metam-sodium preparation and a dimethyl disulfide preparation. When the composition is used, deep tillage is firstly performed on soil, then the metam-sodium preparation and the dimethyl disulfide preparation are mixed according to a certain proportion and then injected into the soil or applied into the soil through a drip irrigation system, the two medicaments can also be successively applied, a reverse burying method is finally adopted for film-covering fumigation for 2-4 weeks, then opening to the air is performed for 3-12 days, and the composition can be planted after a seed germination test of a crop to be cultivated qualitatively judges that no medicament residues exist. The composition is suitable for soil disinfection before planting of crop fields, such as vegetables, strawberries, flowers, melons, nurseries, orchards, tea gardens, vineyards, forests, Chinese herbal medicines and the like, and can effectively control meloidogyne incognita, main soil-borne pathogenic fungi and main grass and broadleaf weeds.

The invention discloses a composition and a method for preventing and treating root-knot nematode, soil borne pathogenic fungi and weeds, and belongs to the technical field of pesticides. The composition consists of dazomet preparation and dimethyl disulfide preparation. The using method of the composition comprises the following steps of: performing deep tillage on the soil, then applying the dazomet preparation into the soil, injecting the dimethyl disulfide preparation into the soil for applying the dimethyl disulfide preparation into the soil through a dropping system, covering a film on the soil by a reverse burying method, fumigating the soil for 2-4 weeks, ventilating the soil for 3-12 days, and planting a crop seed to be cultivated into the soil after the soil does not contain any insecticide residues based on the qualitative judgment of a sprouting test. The composition is suitable for sterilization of the soil before vegetables, strawberries, flowers, melons, nursery gardens, fruit gardens, tea gardens, grape gardens, forests, traditional Chinese medicinal crops and the like are planted; and therefore, the southern root-knot nematode, the main soil borne pathogenic fungi and the main graminaceous and broad leaf weeds can be effectively prevented and treated.

The invention discloses a Burkholderia cepacia onion (Burkholderia cepacia) WY6-5 and an application thereof, deposit No.: CCTCC M 2018248. The onion Burkholderia cepacia WY6-5 has good application inphosphorus degradation, bacteriostasis, plant growth promotion and preparation of dimethyl disulfide.