128 results about "Methyl sulfide" patented technology

The invention relates to an antibacterial and environment-friendly deodorant of microorganism strains and a preparation method thereof. The traditional method for removing odor generally uses essence to cover up the odor or pumping odor physically or uses ozone to oxidize and degrade the odor or uses a chemical method. The methods also can alleviate the odor to a certain extent, but finally the problem can not be solved really and fundamentally and the essence and chemical deodorization also have secondary pollution. The microbial deodorization technology utilizes the effects of high-efficient absorption, absorption and metabolism of particular microorganism strains which can convert or degrade odorant, to purify the odorous gases of amyl mercaptan, benzene methanethiol, methyl sulfide, ethanethiol, hydrogen sulfide, sulfur dioxide, p-benzyl mercaptan, ammonia, dimethylamine, trimethylamine and carbon disulfide and the like which are emitted from human life areas, domestic sewage and domestic garbage and the like and to convert the odorous components of amyl mercaptan, benzene methanethiol, methyl sulfide, ethanethiol, hydrogen sulfide, sulfur dioxide, p-benzyl mercaptan, ammonia, dimethylamine, trimethylamine and carbon disulfide and the like into matters without harm and odor, thus achieving the purpose of thoroughly improving air quality and protecting health of people. The preparation method utilizes a fermentation method of microorganism strains to prepare deodorant products.

The invention belongs to the technical field of medicine, and in particular discloses a levo-fluoroquinolone C3 bisazole methyl sulfide, a preparation method and application thereof in the field of pharmacy. The chemical structural formula of the levo-fluoroquinolone C3 bisazole methyl sulfide is shown as a general formula I, wherein in the general formula I, X is selected from any one of O, S and -NH; and Ar is selected from any one of phenyl, substituent-containing phenyl and heterocyclic aromatic hydrocarbon. The levo-fluoroquinolone C3 bisazole methyl sulfide has strong in vitro cytotoxin effect on experimental leukemia cancer cell strains, has strong anti-tumor activity, and can be mixed with a human acceptable acid salt or a medicinal carrier to prepare an anti-tumor medicament.

The invention relates to a corrosion and scale inhibitor for an oil well in a high water cut stage, which is applicable to corrosion and scale inhibition of an oilfield. The corrosion and scale inhibitor comprises the following components in percentage by weight: 3.25-4.0% of o-dimethyl thiourea, 12.5-13.5% of ethylenediamine tetramethylene phosphonate, 8.0-8.5% of dodecyl butylamine methyl sulfide, 3.0-3.25% of tetradecyl tributyl phosphonium chloride, 15.0-16.2% of DN-3212 acrylic acid, organic phosphine and sulfonic acid copolymer, 5.25-5.75% of M-505A corrosion inhibitor, 6.85-7.25% of SL-2 corrosion and scale inhibitor, 5.0-7.5% of methanol, 3.4-3.75% of methenamine, 0.05-0.055% of vitamin A and the balance of water, wherein the sum of the weight percentage of each component is100%. The corrosion and scale inhibitor has the effects that: when the addition amount of the corrosion and scale inhibitor is 50-60 mg/L, the corrosion inhibition rate of the oil well reaches more than 85%, and the scale inhibition rate reaches more than 90%; and the average pump examination period is prolonged by more than one time.

A preparation method of the Toltrazuril is provided. The Toltrazuril is the 1-[3-methyl-4-(4- Trifluoromethylthiobenzoxy) benzyl]-3-methyl-1, 3, 5, -triazine-2, 4, 6(1H, 3H, 5H)-trione. The methyl sulfide chloro compounds, fluoro-compounds, amides, phenol, methyl nitrate chlorobenzene, benzene aether, ammonia benzene aether, isonitrile acid ester and methyl urea from the reactions of 4-nitrochlorobenzene, sulfur, sodium sulfide and dimethyl sulfate. The detailed preparation is that reaction 1: the methanol of 410g and 4-nitrochlorobenzene of 158g are mixed and heated until soluble and are added with sulfur, sodium sulfide and methanol mixed liquor by drops, and kept for 2h under temperature of 60 DEG C. to 65DEG C.; reduce the temperature, add water of 880g and add dimethyl sulfate of 192g; during the period, the pH value of the sodium hydroxide is adjusted over 9, and the methyl sulfide of 153.6 is gained by filtering after reaction with yield of 91.1 per cent.

The invention provides a method for preparing dimethyl sulfoxide. The method comprises the following steps: contacting dimethyl sulfide and at least one peroxide with a catalyst bed filled with at least one titanium silicalite molecular sieve in a fixed bed reactor under an oxidation condition to obtain a reaction mixture containing dimethyl sulfoxide, wherein at least part of the titanium silicalite molecular sieve is a non-fresh titanium silicalite molecular sieve. Compared with a reaction that dimethyl sulfide is contacted with peroxide without existence of the titanium silicalite molecular sieve, the method has the advantages of improving the conversion rate of dimethyl sulfide, effective utilization rate of oxidant and selectivity of dimethyl sulfoxide. Compared with the reaction that dimethyl sulfide and peroxide are contacted with fresh titanium silicalite molecular sieve, the method has the advantages that a higher oxidant effective utilization rate can be obtained, and the conversion rate of dimethyl sulfide and selectivity of dimethyl sulfoxide can be more stable in a continuous reacting process. Furthermore, the method is mild in reacting condition and easy to control, and is suitable for devices with various production scales.

The invention relates to the technical field of medicines, in particular discloses a levorotatory fluoroquinolone C3 diazole methyl sulfide quaternary ammonium salt, and further discloses a preparation method and application of the levorotatory fluoroquinolone C3 diazole methyl sulfide quaternary ammonium salt in the pharmaceutical field simultaneously. The chemical structural formula of the levorotatory fluoroquinolone C3 diazole methyl sulfide quaternary ammonium salt is represented by a general formula I: the general formula I is described in the specification. The levorotatory fluoroquinolone C3 diazole methyl sulfide quaternary ammonium salt provided by the invention has stronger in-vitro cytotoxicity effect on experimental leukemia cancer cell strains and stronger anti-tumor activity, and can be mixedly prepared into anti-tumor medicines with human body acceptable acidic salts or pharmaceutical carriers.

The invention relates to a daptomycin synthesis method for resolving the technical problem of prior art which uses rose spore streptomycete as raw material to cost high synthesis cost. The synthesis method comprises a, using 2-chlorine trityl chloride resin as carrier, via solid synthesis method to connect the amino acids with protective groups, to obtain protective decapeptide resin while the Fmoc-protective groups are removed in turn, B, connecting decanoic acid via same method, connecting next amino acid via esterification, removing Fmoc-protective groups, and connecting left two amino acids via normal solid method, removing Fmoc-protective groups, c, using trifluoroacetic acid or carrene solution to cut off total protective peptide from resin, drying and completing end-to-end liquid cyclisation in organic solvent, d, using the mixture of trifluoroacetic acid, water and benzene methyl sulfide to cut off peptide from resin to obtain crude product. The invention can synthesize daptomycin.

The invention discloses a process for preparing hydrogen sulfide through the reaction between sulfuric-acid-containing exhausted liquid (by product of the production process for preparing chemical product and intermediate product by means of chemical reactions) and barium sulphide water soluble liquid phase (prepared from barium sulphide calcined member through water leaching), the produced hydrogen sulfide can be further used in preparing other chemical products, such as sodium hydroxide, sodium hydrogen sulfide, ammonium sulfide, ammonium hydrosulfide, sulfourea, methyl hydrosulfide, ethyl mercaptan and dimethyl sulfur ether.

The present invention generally relates to the manufacture of methyl mercaptan using recycled dimethyl sulfide. In particular, the invention relates to a process for the continuous production of methyl mercaptan via the catalytic conversion of dimethyl sulfide using a non-promoted Al₂O₃ catalyst at low temperatures.

The present invention provides an efficient dimethyl sulfoxide (DMSO) production process improved in the conversion from dimethyl sulfide (DMS) to DMSO by recycling the NOx used as a catalyst in the continuous oxidation reaction of DMS for producing DMSO, specifically providing a DMSO production process improved in the recovery rate and/or absorption rate of NOx by recovering NOx from the reaction off gas and/or the gas removed from the reaction product solution for re-utilization.

The invention discloses a method for synthesizing methyl tin chloride. The invention adopts a synthesizing method by high pressure and one-step catalysis. The method comprises the following specific steps that: dimethyl thioether is used as a catalyst; tin powder and the methyl tin chloride are evenly mixed in a stainless steel high-pressure reaction kettle at a temperature of between 180 and 200 DEG C, passed through with methyl chloride and heated to a temperature of between 180 and 230 DEG C for carrying out a first reaction; after the methyl chloride is consumed, tin tetrachloride is added and methyl chloride is passed through to the mixture for carrying out a second reaction for 3 to 6 hours; and the mixture is subjected to decompression and distillation to prepare the methyl tin chloride. The method changes the prior synthesizing method which uses a grignard reagent to synthesize the methyl tin chloride; as the adopted catalyst is low molecular thioether, the catalyst has cheap price, shortens the process of synthesizing a methyl tin intermediate product; and the synthesized methyl tin intermediate product has high purity, contains no other impurities and has a yield reaching over 99 percent.

The invention provides a method for oxidizing dimethyl sulfide. The method comprises the step of contacting a liquid mixture with a least one titanium silicate molecular sieve serving as a catalyst under the condition of an oxidation reaction, wherein the liquid mixture contains dimethyl sulfide and at least one oxidant, and the pH value of the liquid mixture is 0.5-5.5. Compared with the method for directly contacting a liquid mixture of dimethyl sulfide and the oxidant with a titanium silicate molecular sieve, the method can be used for remarkably improving the selectivity of dimethyl sulfone and receiving high dimethyl sulfide conversion rate and high oxidant effective utilization rate. Furthermore, under a situation that other conditions are the same, a basically same dimethyl sulfide conversion rate, a higher oxidant effective utilization rate and dimethyl sulfone selectivity can be obtained by the method even at a lower temperature. Furthermore, the method is easy to implement.

The invention discloses litchi essence which comprises the following components in percentage by weight: 65-95% of propylene glycol, 0.01-2% of dimethyl sulfide, 0.01-4.5% of ethyl acetate, 0.01-0.5% of alpha-terpilenol, 0.01-3% of d-limonene, 0.01-0.5% of ocimene, 0.01-1.5% of beta-caryophyllene, 0.01-0.5% of bisabolene, 0.01-2.3% of ethyl butyrate, 0.01-1.7% of linalool, 0.01-2.5% of beta-pinene, 0.01-4% of acetoin, 0.01-3% of phenethyl alcohol, 0.01-3% of nerol, 0.01-1.5% of geraniol, 0.01-1.8% of vanillyl alcohol, 0.01-0.2% of bitter orange flower oil, 0.01-0.5% of geranium oil, 0.01-1% of benzyl benzoate and 0.01-1% of 2-phenethyl phenylacetate.

The invention relates to a simple synthesizing method of 2-pyridine methyl sulfide and related drugs. The method is characterized in that 2-methyl pyridine n-oxide is used as the raw material and pyridine n-oxide or dichloromethane is used as the solvent to have reaction with trifluoroacetic anhydride to obtain a trifluoroacetate intermediate, purification is not needed, the trifluoroacetate intermediate is allowed to have reaction with thiophenol under the catalysis of lithium bromide or tetrabutyl ammonium bromide and by using toluene or ethyl acetate as the solvent to generate the 2-pyridine methyl sulfide. The method is simple to operate, cheap in reagents, easy in reagent obtaining, mild in reaction conditions, wide in substrate applicability, good in position selectivity, high in yield and the like. In addition, the method is successfully applied to the synthesizing of omeprazole sulfide and rabeprazole sulfide, and the synthesizing method does not need catalysts.

The invention discloses a preparation method of dimethyl sulfide. The method comprises the step of reacting hydrogen sulfide with methanol in the presence of a modified molecular sieve catalyst to generate dimethyl sulphide, and is characterized by preparing the modified molecular sieve catalyst by firstly processing a molecular sieve catalyst with an alkaline water solution and then washing the molecular sieve catalyst with an acid solution. By adopting the method, reaction between hydrogen sulfide and methanol can be effectively catalyzed, and methanol can have a higher conversion rate while higher selectivity of dimethyl sulfide can be obtained.

The present invention relates to a method for increasing L-methionine productivity and organic acid productivity. More particularly, the present invention relates to a method which involves adding a mixture containing methyl mercaptan and dimethyl sulfide at a appropriate ratio to O-acetyl homoserine or O-succinyl homoserine and to an enzyme having an activity of converting methionine precursor into L-methionine, so as to perform an enzyme reaction, to thereby improve the conversion rate of L-methionine and organic acid from the L-methionine precursor, and thus increasing L-methionine yield as compared to conventional method.

The invention discloses a crab essence and its preparation method and application. The crab essence contains dodecanoic acid, thiothiazole, thioacetate, ethyl octanoate, ethyl myristate, edible glacial acetic acid, dimethyl sulfide, Distilled ginger oil, trimethylamine, capric acid, caprylic acid, caprylic acid thioester, 3-methylthiopropanal, 2,3,5-trimethylpyrazine, propylene glycol and glyceryl triacetate, the present invention has developed a specific formula Crab flavor, just a small amount, has the effect of strong crab meat, good fresh and sweet taste, and high fidelity, and is loved by a wide range of consumers; and even after high-temperature roasting, frying, and steaming, it will not affect the effect of crab flavor. It shows that the crab essence of the present invention has the properties of high temperature resistance and stable flavor. The crab essence of the invention can well supplement the flavor loss of the recombined crab meat due to thermal processing, enhance the sweetness and authenticity of the crab meat-flavored meatballs, and improve consumers' liking.

The invention relates to a catalyst and provides a phosphorous catalyst with higher methyl sulfide transformation rate and methyl mercaptan selectivity for synthesizing the methyl mercaptan, and a preparation method thereof. The phosphorous catalyst is phosphorus modified alumina, the content of phosphorus contained in the phosphorous catalyst is 1-10 percent and preferably 3-5 percent, and the balance is alumina. The preparation method comprises the following steps of: dissolving a metered aluminum precursor by using water to prepare an aluminum solution; heating the aluminum solution, and then adding a metered phosphorus precursor solution and a dispersing agent, stirring, and adding a precipitator to form a gel solution at the same time; regulating the pH value of the gel solution to 5-9, and then ageing; drying the aged gel to constant weight, and then calcining to obtain the phosphorous catalyst for synthesizing the methyl mercaptan.

The invention discloses a method for simultaneously producing dimethyl sulfone and dimethyl sulfoxide. The method comprises the steps that firstly, methyl sulfide reacts under the condition that dimethyl sulfone can be formed, a mixture containing dimethyl sulfone is obtained, and after dimethyl sulfone is freely separated out of the mixture and is further in contact and reacts with the other part of methyl sulfide, an unreacted oxidizing agent is utilized for oxidizing methyl sulfide to form dimethyl sulfoxide. The conversion rate of the oxidizing agent is effectively improved, running cost is reduced, and the requirement for subsequent residual oxidizing agent treatment and other steps is lowered. According to the method, high target oxidation product selectivity can be achieved during the two-step oxidizing reaction.

The invention relates to the technical field of fine chemical engineering and discloses a novel method for preparing benzo 1,3-oxathiane-4-ketone. The method includes steps: taking 2-carboxyphenyl dimethyl sulfide as a raw material, taking silver oxide and 1-chloromethyl-4-fluoro-1,4-diazabicyclo[2.2.2]octane di(tetrafluoroboric acid) salt as additives, and subjecting to reaction in 1,2-dichloroethane at 120 DEG C for 10 hours to obtain benzo 1,3-oxathiane-4-ketone. Compared with an existing method, the novel method has advantages that quickness and simplicity are realized, commercial 2-carboxyphenyl methyl sulfide is directly used as a reaction raw material to realize one-step direct construction of a target product, and novel reaction, simplicity in operation, high efficiency, potentialindustrial values and worthiness of popularization and application are realized.

The invention discloses a technique for preparing middle raw material for producing methyl mercaptan and/or dimethyl sulfide by natural gas. The technique includes steps of after preheating, mixing natural gas and sulphur in a device and heating to 600-700 DEG C, and preforming partial chemical reaction; reacting in a adiabatic reactor to obtain a mixed gas containing hydrogen sulfide and carbon disulfide; cooling the reacted mixed gas to 120-200 DEG C and performing gas and fluid separation, wherein the obtained gas is the middle raw material for producing methyl mercaptan and/or dimethyl sulfide. Through the natural gas sulfuration technique, the sulfuretted hydrogen, carbon disulfide and other middle raw materials for producing methyl mercaptan and/or dimethyl sulfide are obtained; thus the methyl mercaptan and dimethyl sulfide is further produced; the technique is featured by being low in raw material cost, convenient to convey and adaptable to domestic natural gas with high sulfur content.

A method for synthesizing and producing dimethyl disulfide from methyl mercaptan and dimethyl sulfoxide comprises the following steps: introducing methyl mercaptan and dimethyl sulfoxide according to a molar ratio of 2:0.95-1.55 into a reactor, in the presence of an aluminium oxide catalyst, performing synthetic reaction to obtain reaction products dimethyl disulfide, dimethyl sulfide and water, performing condensation, cooling and standing separation on the reaction products to obtain a crude product dimethyl disulfide, and performing rectification to obtain a qualified dimethyl disulfide finished product. The methyl mercaptan synthetic process is employed for obtaining dimethyl disulfide, and the method is simple in production process, low in production cost, beneficial for large-scale industrialized production and less in produced ''three wastes (waste gas, waste water and industrial residue)'' discharge, and has substantial social benefic and economic benefit.

The invention discloses a method for preparing dimethyl sulfoxide from dimethyl sulfide, and relates to methods for preparing dimethyl sulfoxide. Oxidization reaction is carried out under the pressures ranging from -0.1 Mpa to 0.5 Mpa at the temperatures ranging from 0 DEG C to 70 DEG C. The method has the advantages that the dimethyl sulfide is dissolved in solvents, the chance of forming explosive mixtures by dimethyl sulfide steam and oxygen can be prevented in the presence of the solvents, and uniform mixed solution can be formed; the mixed solution is filled with high-concentration ozoneunder the condition of the presence of catalysts; the ozone is used as an oxidizing agent, and bubble reaction is carried out in a vertical-pipe reactor with a large length-diameter ratio; oxidized dimethyl sulfide is converted into the dimethyl sulfoxide in the procedure, the pressures and the temperatures of reaction systems are controlled, the stage for oxidizing the dimethyl sulfide to obtainsulfoxide can be controlled by added selective catalysts, the reaction conversion rate is 95-98%, and the yield can reach 90-96%; efficient, complete, environment-friendly and high-selectivity technologies can be created for preparing the sulfoxide from the dimethyl sulfide by means of oxidization by the method.

The invention discloses a method for selectively synthesizing benzyl trifluoromethyl sulfide. The method comprises the following steps: taking alkyl aromatic hydrocarbon ArCHR1R2 as a raw material; and under irradiation by a blue light lamp, in a solution, under the argon atmosphere and under presence of a small amount of potassium carbonate, taking 4CzIPN as a photocatalyst to react with 2-((trifluoromethyl) sulfenyl)isoindoline-1, 2, 3, 4-thiadiazole to obtain photocatalyst 4CzIPN shown in the benzyl trifluoromethyl sulfide ArCR1R2SCF3 (3), wherein the photocatalyst 4CzIPN has the followingstructure shown in the specification. According to the method, the reaction conditions are mild, no oxidizing agent or high-temperature condition is needed, residues of transition metal are avoided, and benzyl trifluoromethyl sulfide is directly obtained from alkyl arene and trifluoromethyl sulfide reagents which are stable and easy to obtain.

The invention discloses a dimethyl sulfide preparation method. The method is characterized in that hydrogen sulfide reacts with methanol in the presence of a catalyst to synthesize dimethyl sulfide, wherein the catalyst contains a molecular sieve with a BEA structure. The catalyst containing the molecular sieve with a BEA structure adopted by the method can effectively catalyze the reaction of hydrogen sulfide and methanol, realizes high dimethyl sulfide selectivity and high methanol conversion rate, and still realizes high dimethyl sulfide selectivity and high methanol conversion rate after long-period use.

The invention discloses a sludge drying waste gas purification device for a sewage treatment plant. The device comprises a plurality of connecting pipes, a cyclone dust collector and integrated equipment. The cyclone dust collector is communicated with the integrated equipment through the connecting pipe. A primary spraying structure, a secondary spraying structure and a composite photocatalysis structure are arranged in the integrated equipment. Waste gas enters the cyclone dust collector from the connecting pipe to remove dust, then enters the integrated equipment and is sequentially washedby the primary spraying structure and the secondary spraying structure; and the washed waste gas is dehydrated and enters the composite photocatalysis structure to achieve organic matter decomposition. The purification effect on waste gas with large air volume, low concentration, high temperature and high protein dust content is good, and after treatment, the concentration monitoring indexes of dust, H2S, NH3, methyl mercaptan, dimethyl sulfide, methyl sulfide, methyl disulfide and foul smell at an exhaust port are far lower than the environment-friendly emission standard. The invention also relates to a sludge drying waste gas purification method for a sewage treatment plant.