46 results about "Dimethyl sulfide" patented technology

The invention discloses asphalt-based hard carbon, a preparation method thereof and a sodium-ion battery negative electrode material, and relates to the technical field of sodium-ion batteries. The preparation method of the asphalt-based hard carbon comprises the following steps: S1, mixing an asphalt precursor, a sulfur source and a cross-linking agent, and performing cross-linking vulcanization treatment at a first temperature to obtain a primary product; s2, performing carbonization treatment on the primary product at a second temperature to obtain asphalt-based hard carbon; the sulfur source is any one of elemental sulfur, thiourea, dimethyl sulfide and sulfide, or any two of elemental sulfur, concentrated sulfuric acid, thiourea, dimethyl sulfide and sulfide. By adopting the method, the type of the sulfur source is controlled, and the sulfur source and the cross-linking agent are added, so that the reversible capacity and the rate capability of the asphalt-based negative electrode material can be effectively improved, and the application field of the asphalt-based negative electrode material is widened.

The utility model discloses a thin film evaporation device for removing dimethyl sulfide, which comprises a thin film evaporation container main body, the top of the thin film evaporation container main body is provided with a feed port, and the top of the right side of the thin film evaporation container main body is provided with a steam heating external connection pipe used for being externally connected with a steam heater; and a film mesh is arranged in the film evaporation container main body. According to the utility model, the dimethyl sulfide material is spread on the film mesh through the rotating scraper blade to form a film so as to promote evaporation, and the thickness of the film scraped by the scraper blade can be adjusted according to the viscosity of the material and the change of the raw material, so that the situation that the evaporation efficiency is influenced by the too thick or too thin dimethyl sulfide material in the prior art is avoided; and the structure is simple, and adjustment is convenient, so that the scraper blade can flexibly adjust the thickness of the film according to actual changes, the adaptability in evaporation use is improved, and the use requirement for accurate removal of dimethyl sulfide is greatly met.

The utility model relates to the technical field of wine liquid production, in particular to deodorizing spirit distillation equipment which comprises a distillation copper pot, a condenser and at least one maintaining pipe. The distillation copper pot is used for distilling the wine liquid into wine liquid steam. The condenser is arranged outside the distillation copper pot and located on the downstream portion of the distillation copper pot so as to be used for receiving and condensing wine steam in the distillation copper pot. The maintaining pipe is located between the distillation copper pot and the condenser and used for conveying wine steam in the distillation copper pot to the condenser. The maintaining pipe made of the copper-containing material is arranged between the distillation copper pot and the condenser, and the maintaining pipe is arranged upwards in the vertical direction in a winding manner, so that the reaction time between the wine steam and the copper material is prolonged, the odor carried by components such as dimethyl sulfide in the wine steam is better purified, and the quality of the wine is improved. And various flavor sensory characteristics are added to the spirit.

The invention discloses a tetra-coordinated boron-oxygen heterocyclic compound and a preparation method thereof, and belongs to the technical field of pharmaceutical and chemical intermediates and related chemistry. The method comprises the following steps: by taking a bis (pentafluorophenyl) borane dimethyl sulfide complex [(C6F5) 2BHSMe2] as a boron source, firstly carrying out hydroboronation reaction on the bis (pentafluorophenyl) borane dimethyl sulfide complex [(C6F5) 2BHSMe2] and an eneyne compound to generate a three-coordination alkenyl boron dienophile intermediate in situ, and then carrying out reverse electron demand Diels-Alder reaction on the three-coordination alkenyl boron dienophile intermediate and an acetylenic ketone compound to synthesize a series of tetra-coordination boron-oxygen heterocyclic compounds. The method has the advantages of mild reaction conditions, good selectivity, high yield, wide substrate application range, environmental friendliness, simplicity and convenience in operation and the like, opens up a new way for synthesis of the tetra-coordinated organoboron compound, and has higher application value and social and economic benefits.

The invention discloses a synthesis method of a high-abundance C-13 ethylene oxide compound, which comprises the following steps: (1) carrying out reaction on 13CH3I and diphenyl sulfide to obtain [13C] diphenylmethyl iodide; and (2) reacting the [13C] diphenylmethyl iodide with a carbonyl compound to obtain the high-abundance [13C] ethylene oxide compound. Diphenyl sulfide is adopted to replace dimethyl sulfide, the obtained [13C] methyl diphenyl sulfonium iodide avoids C-13 loss in the subsequent reaction process, and the abundance of C-13 is effectively improved.

The invention relates to a quantitative analysis method for determining trace dimethyl sulfide impurities in a dimethyl disulfide product, a high performance liquid chromatograph-variable wavelength detector is adopted for analysis, and the specific analysis method comprises the following steps: preparing a standard solution and a sample to be detected; and detecting the components of the sample to be detected by adopting a liquid chromatography system-variable wavelength detector (VWD). Wherein the detection conditions are as follows: a C18 chromatographic column, a quaternary pump and an automatic sampling system are adopted, a mobile phase A is ultrapure water, a mobile phase B is acetonitrile, the flow velocity is 0.8-1.2 mL / min, and the column temperature is 30-40 DEG C. According to the present invention, the strong ultraviolet response of DMDS is inhibited by using the high water phase environment, and the retention behavior and the peak shape of DMS are improved by using the solvation effect of the synergist so as to achieve the efficient separation of the main component and the trace impurity; in actual sample determination, the method successfully detects the residual trace DMS in the industrial grade disulfide, the result is stable and reliable, and the method is suitable for product quality control and process optimization.

The invention discloses a preparation method of composite roasted peanut essence, which belongs to the technical field of essence, and comprises the following steps: preheating peanut oil and caprylic / capric triglyceride; the preparation method comprises the following steps: dissolving ethyl maltol, vanillin, methyl cyclopentenolone, 2, 3, 5-trimethylpyrazine and 2-acetylpyrazine; vanillin propylene glycol acetal, isovaleraldehyde propylene glycol acetal, triethyl citrate, delta-decalactone, delta-dodecalactone and 5-hydroxyethyl-4-methylthiazole are fused to obtain a mixture; dispersing the roasted peanut extract; 2, 3-dimethylpyrazine, 2-methoxyl-5-methylpyrazine and 4-methylthiazole are fused, and then the mixture is subjected to a reaction; the preparation method comprises the following steps: fusing cocaal, dimethyl sulfide, 2-ethyl-3, 5, 6-dimethylpyrazine, 2, 3, 5, 6-tetramethylpyrazine, 2-methylpyrazine, 2-acetylpyridine, 2-methoxy-3. 5. 6-isopropyl pyrazine, 2-methylthio-3-methylpyrazine, isovaleric acid, 1-octylene-3-alcohol, 5-methylfurfural and 3, 4-dimethyl-1, 2-cyclopentanedione; standing is performed; filtering is performed; the fragrance of the roasted peanuts is closer to that of the roasted peanuts which are just taken out of a furnace, and the natural flavor of the roasted peanut essence is increased.

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 invention discloses a preparation method of an eprinomectin intermediate oxide. The eprinomectin intermediate oxide is obtained by taking an abamectin hydroxyl protection substance as a starting raw material through oxidation reaction and post-treatment. According to the invention, active manganese dioxide is adopted as an oxidizing reagent, the operation is simple, the generation of peculiar smell of a by-product dimethyl sulfide during dimethyl sulfoxide oxidation in the prior art is avoided, the yield reaches 98.0% or more, the purity of the oxide can reach 95.0% or more, and the content of double-oxide impurities can be controlled to be 0.2% or less.

The invention belongs to the technical field of material synthesis, and particularly relates to calcium dodecahydrododecaborate as well as a synthesis method and application thereof. According to the synthesis method of calcium dodecahydrododecaborate provided by the invention, calcium hydride CaH2, a borane dimethyl sulfide complex and an ether mixed organic solvent react in a reaction kettle to obtain a product, and monoethylene glycol dimethyl ether and tetrahydrofuran cyclic ether are compounded to obtain the ether mixed organic solvent; according to the method, the yield and purity of the product calcium dodecahydrododecaborate are improved, meanwhile, deionized water is used for carrying out solvent exchange on the product and drying is carried out, the purity of the product calcium dodecahydrododecaborate is further improved, efficient synthesis of calcium dodecahydrododecaborate is achieved, industrial preparation is facilitated, high-purity calcium dodecahydrododecaborate is provided, and the method is suitable for industrial production. The method is expected to meet the requirement of solid electrolyte battery commercialization on electrolyte, and solves the technical problem of lack of an efficient synthesis process of calcium dodecahydrododecaborate at present.

The application discloses a MOFs derived N-rich doped three-dimensional porous Co / NC-D composite material and a preparation method thereof. The method comprises the following steps: adding an organic ligand into methanol and ultrasonically dissolving to obtain an organic ligand solution; adding Co(NO3)2.6H2O, Zn(NO3)2.6H2O and dicyandiamide (DCDA) into methanol and ultrasonically dissolving to obtain a metal salt solution; adding the organic ligand solution into the metal salt solution, stirring, centrifuging, washing and drying to obtain a ZIF-67-D or ZnCo-ZIF-D material; and performing calcination, acid washing, filtering, drying and vacuum drying to obtain the material. Compared with Co / AC, Co / rGO and a material obtained by directly calcining ZIF-67, the material has good dispersity and small Co nanoparticles and a synergistic effect between Co and N species, exhibits excellent performance in catalyzing dimethyl sulfide oxidation under mild conditions and has recyclability and a good application prospect.

The invention discloses a Karl Fischer moisture determination method for sulfur-containing organic compounds, and belongs to the technical field of chemical analysis. The method comprises the following steps: adding absolute methanol, imidazole and an inhibitor (selected from N-substituted maleimide or acrylate compounds) into a titration system, then adding a sample, and titrating with a pyridine-containing Karl-Fischer reagent to the end point. The inhibitor can effectively capture reducing sulfur species and eliminate interference of the reducing sulfur species on iodine. Experiments show that for sulfur-containing samples such as 2, 2-dimethylthiopropane, dimethyl sulfide, dimethyl disulfide and the like, the deviation reduction rate of the method is more than 60% compared with that of a traditional method; the method is easy and convenient to operate, high in accuracy and suitable for moisture analysis of sulfur-containing organic matter in the fields of petrifaction, pharmacy and the like.

The invention relates to a method for preparing methyl mercaptan and dimethyl sulfide by reducing SO2 with methanol, which comprises the following steps: 1) deoxidizing, purifying and concentrating metallurgical flue gas to obtain high-concentration SO2 gas as raw material gas, preheating, and feeding into a main reactor; preheating methanol raw material gas and hydrogen sulfide gas, and introducing the preheated gas into the main reactor; (2) carrying out reduction reaction on each raw material gas under the action of a catalyst in the main reactor to generate methyl mercaptan; (3) enabling gas flow flowing out of the main reactor to enter a condensing heat exchanger, recovering generated methyl mercaptan in a liquid form through condensation, and enabling non-condensable gas to enter a hydrogen sulfide absorption and separation unit; 4) desorbed and regenerated hydrogen sulfide gas is returned to the main reactor; and 5) purifying methyl mercaptan, and then carrying out a synthetic reaction in the secondary reactor to obtain dimethyl sulfide (DMS). Compared with the prior art, the method has the advantages that the reduction reaction temperature of SO2 is obviously reduced, the reaction rate and the yield of methyl mercaptan are obviously increased, and the method has better application and popularization prospects.

The invention relates to the technical field of dimethyl sulfide detection, and particularly discloses a dimethyl sulfide synthesis gas on-line detection method, which comprises the following steps of: filtering synthesis gas from a sampling port of a synthesis device, feeding the filtered synthesis gas into a gas inlet of a six-way valve, and analyzing and testing by adopting a gas chromatograph; the method can effectively separate various components in the dimethyl sulfide synthesis gas, has the characteristics of high analysis speed and accurate and reliable result, can adapt to the dynamic change of the synthesis gas components in the synthesis reaction process, and provides powerful data support for process control.

The invention discloses walnut essence and a preparation method thereof. The essence comprises furanone, methyl cyclopentenolone, 2-acetylpyrazine and benzaldehyde acetal compounds as core components, and the four components synergistically provide vivid and stable roasted walnut characteristic aroma; preferably, the formula also contains auxiliary materials such as butanedione, ethyl maltol, ethyl 2-methylbutyrate, dimethyl sulfide and the like, and ethanol and propylene glycol are used as solvents. According to the invention, benzaldehyde acetal (such as benzaldehyde PGA) is adopted to replace free benzaldehyde, so that the stability of the essence in high-temperature processing is remarkably improved. The prepared essence is rich in fragrance level and lasting in fragrance, and can be widely applied to foods, beverages and daily chemical products.

We offer a corn tea beverage that reduces the scratchy feeling in the throat. [Solution] In a corn tea beverage, guaiacol and dimethyl sulfide at a concentration of 300 ppb or more are added, and the ratio of dimethyl sulfide content to guaiacol content (by mass) is set to 10 or more.

This invention discloses a method for preparing dimethyl sulfoxide, relating to the field of electrochemical technology. The method for preparing dimethyl sulfoxide includes the following steps: passing gaseous dimethyl sulfide and water vapor into the anode of an electrochemical reaction device, passing water into the cathode of the electrochemical reaction device, and applying a DC voltage between the anode and cathode to carry out an electrochemical reaction to obtain a product containing dimethyl sulfoxide; wherein, the anode includes a composite matrix and a perfluorosulfonic acid ionomer loaded on the surface of the composite matrix; the composite matrix includes a first substrate and an anti-corrosion coating disposed on the surface of the first substrate, the anti-corrosion coating being made of at least one of ruthenium oxide, iridium oxide, antimony-doped tin oxide, tantalum oxide, and lead oxide, which solves the problems of high energy consumption, low product yield and selectivity in the preparation of dimethyl sulfoxide by liquid-phase electrochemical oxidation method in the prior art.

This invention belongs to the field of chemical synthesis technology, specifically relating to a method for synthesizing 1-(7-amino-6-bromo-4,4-dimethyl-3,4-dihydroquinoline-1(2H)-yl)ethyl-1-one. Using compound A as a basic raw material, this invention obtains 1-(7-amino-6-bromo-4,4-dimethyl-3,4-dihydroquinoline-1(2H)-yl)ethyl-1-one through reactions such as reaction with borane dimethyl sulfide, nitration, and acetylation. This method is easy to operate and produces products with high yield and high purity.

To provide a technique which can mask a DMS smell.SOLUTION: A method for producing a beverage containing a dimethyl sulfide comprises a step of adjusting a concentration of 2-ethyl-3-methylpyrazine to 0.1 ppb or more.SELECTED DRAWING: None

The invention belongs to the technical field of material synthesis, and particularly relates to bis (tetramethylammonium dodecahydrododecaborate) as well as a synthesis method and application thereof. According to the synthesis method of the dodecahydrododecaborate bis (tetramethylammonium), expensive and difficult-to-obtain raw materials are not used, the dodecahydrododecaborate bis (tetramethylammonium) is synthesized through one-step reaction of tetramethyl ammonium borohydride (CH3) 4NBH4 and the borane dimethyl sulfide complex in the high-pressure reaction kettle, the reaction steps are simple, the yield is high, and the method is suitable for industrial production. According to the present invention, the dodecahydrododecaboronic acid bis (tetramethyl) ammonium synthesis process has characteristics of high yield and high purity, is an efficient dodecahydrododecaboronic acid bis (tetramethyl) ammonium synthesis process, is hopeful to provide the high-purity dodecahydrododecaboronic acid bis (tetramethyl) ammonium on a large scale, meets the application requirements of dodecahydrododecaboronic acid bis (tetramethyl) ammonium in a plurality of fields, and has wide application prospects. Therefore, the technical problem that an efficient synthesis process for dodecahydrododecaboronic acid bis (tetramethylammonium) is lacked at present is solved.

The invention discloses gold (I) complexes containing benzene ring ligands, a preparation method of the gold (I) complexes and application of the gold (I) complexes in preparation of antitumor drugs. The gold (I) complex has a structure as shown in a general formula I, wherein Rx in the general formula I is a group containing a benzene ring; the preparation method comprises the following steps: enabling chloroauric acid to react with dimethyl sulfide to obtain an intermediate Au (Me2S) Cl, then enabling the intermediate Au (Me2S) Cl to react with an organic phosphine ligand to generate a phosphine-chlorine-gold intermediate, and finally enabling the phosphine-chlorine-gold intermediate to react with a sulfydryl ligand under an alkaline condition to obtain a target product. The series of complexes show remarkable proliferation inhibition activity on ovarian cancer cells, melanoma cells, non-small cell lung cancer cells and cis-platinum drug-resistant strains thereof in vitro, the effect of the complexes is superior to that of cis-platinum and Jinnofen, and candidate compounds are provided for developing novel anti-drug-resistant tumor drugs.

The application provides a method for deeply removing sulfides from fuel gas, comprising the following steps: (1) removing hydrogen sulfide gas by an organic alcohol amine absorbent; (2) contacting and reacting the fuel gas after removal of hydrogen sulfide gas with an oxidizing solvent to remove methyl mercaptan, dimethyl sulfide and residual hydrogen sulfide, the oxidizing solvent comprising 1-10% of an organic alcohol amine, 0.5-20% of an organic solvent, 2-38% of an oxidizing agent, 0.2-1% of an inorganic salt, and the balance of water, the organic solvent being at least one selected from the group consisting of tributyl phosphate, dimethylformamide, N-methyl pyrrolidone and polyethylene glycol dimethyl ether; the oxidizing agent being at least one selected from the group consisting of sodium hypochlorite, sodium chlorate, potassium hypochlorite, potassium chlorate, hydrogen peroxide and potassium permanganate; the inorganic salt being sodium carbonate and / or potassium carbonate; (3) adsorbing the fuel gas after removal of hydrogen sulfide, methyl mercaptan and dimethyl sulfide by an adsorbent to remove carbonyl sulfur and carbon disulfide.

The invention provides a perovskite thin film and a preparation method and application thereof. The preparation method comprises the following steps: coating the surface of an interface layer of a substrate with a perovskite precursor solution to obtain a perovskite wet film; and extracting the ligand solvent in the perovskite wet film precursor by adopting an anti-solvent to obtain the perovskite thin film, wherein the perovskite precursor solution comprises a ligand solvent, and the anti-solvent comprises dimethyl sulfide. According to the invention, dimethyl sulfide (DMS) is used as an anti-solvent, has high coordination capability, can extract most of ligand solvents, improves the performance of the perovskite film, is volatile, insoluble in water and free of hidden danger of stability, and also reduces the degree of harm to the health of operating personnel due to low toxicity.

The application discloses coffee essence, atomized liquid and electronic atomization device, and belongs to the field of electronic atomizers. The coffee essence comprises 2-acetylpyrrole, vanillin, methylcyclopentenolone, maltol, furfuryl acetate, guaiacol, isopentyl alcohol propylene glycol solution, furfuryl mercaptan, 2-ethyl-3,5-dimethylpyrazine, isovaleric acid propylene glycol solution, 2,3,5-trimethylpyrazine, isobutyraldehyde, 2-methyl-3-(methylthio)pyrazine, isoamyl aldehyde, trigonellin, 4-hydroxy-2,5-dimethyl-3(2H)-furanone, 5-methylfurfural, dimethyl sulfide, 2-acetylfuran, 5-hydroxyethyl-4-methylthiazole, 2-acetylpyrazine, 4-ethylguaiacol, acetic acid, propionic acid, acetaldehyde propylene glycol solution, 4-methyl-5-(2-acetyloxyethyl)-thiazole and propylene glycol. The coffee essence has good stability, good compatibility and can accurately restore the real coffee roasting aroma.

The application discloses a novel preparation method of a bistrifluoromethyl sulfide. The disclosed scheme uses dimethyl sulfide, chlorine and fluoride as raw materials, and obtains the bistrifluoromethyl sulfide through a photochlorination and fluorination two-step reaction. The two-step reaction temperature of the application is within 80 DEG C, and the reaction condition is mild.

The invention discloses a controllable ceramic film with excellent conductivity and a preparation method thereof, and relates to the technical field of ceramic film preparation. The method comprises the following steps: mixing polycarbosilane, a borane dimethyl sulfide complex, tetra (diethylamide) hafnium and toluene, heating, and cooling to prepare a SiHfBCN precursor solution; adding molybdenum powder, and uniformly stirring to obtain slurry; spin-coating on the surface of the pretreated silicon wafer to prepare a polymer liquid film; heating, curing and cross-linking are carried out, then cooling is carried out, and the SiHfBCN-based ceramic thin film is prepared. The preparation process is simple, and low-temperature rapid preparation of the compact ceramic film with micron-sized thickness, resistivity as low as milliohm level and excellent conductivity is realized. The problems that an existing ceramic film is poor in conductivity and high in preparation cost are solved.

The invention belongs to the technical field of dimethyl sulfoxide production, and particularly relates to a technology for producing dimethyl sulfoxide through dimethyl sulfide oxidation. According to the process, dimethyl sulfide is taken as a raw material, dimethyl sulfoxide is taken as a solvent, hydrogen peroxide is taken as an oxidizing agent, a micro-channel reactor is utilized to strengthen a reaction process, and the dimethyl sulfoxide is continuously produced under the conditions of low temperature and low system pressure. According to the method, the conversion rate of the raw materials is increased, the reaction conditions are mild, the reaction time is short, the reaction safety is high, post-treatment of a product after reaction is simple, and continuous production can be realized.

The invention discloses a preparation method of a northern dance Yu hot soup flavor essence composition. The preparation method comprises the following steps: firstly, respectively preparing a beta-myrcene precursor, a dimethyl sulfide precursor and glucosyl anisd; then trehalose-beta-cyclodextrin is used as a carrier for inclusion of the product, 1, 8-cineole and linalool, and a composite precursor aroma component is obtained; and finally, by taking the ferulic acid modified propylene glycol alginate-purple perilla seed polysaccharide as a wall material and dispersing a mixture of the composite precursor aroma component and the remaining flavor components in a solvent as a core material, carrying out electrostatic spray drying to obtain a finished product. According to the invention, through precursor aroma preparation, multi-stage inclusion and modified wall material embedding technologies, the volatility of flavor molecules is reduced, unpleasant odor is masked, and the flavor coordination and stability are improved. When the finished product is applied, the flavor is slowly and continuously released, the spicy, warm and moist feeling and mellow and lingering feeling of the North Dance Fu spicy soup can be enhanced, flavor levels are synergistically enriched, and the extreme flavor experience of the North Dance Fu spicy soup is restored to the greatest extent.

This invention discloses a biofilm formation start-up method and apparatus for treating organic sulfur odor pollutants in a bio-trickling filter, belonging to the field of bio-trickling filtration deodorization technology. Specifically, it involves adding dimethyl sulfoxide (DMSO) to the nutrient solution in the bio-trickling filter's water tank to selectively cultivate microorganisms capable of degrading organic sulfur odor pollutants. Furthermore, aeration is provided in the water tank to ensure an aerobic environment for microbial growth and prevent the growth of anaerobic microorganisms. Simultaneously, the addition of molybdenum to the nutrient solution's trace elements is avoided to inhibit the growth of sulfate-reducing bacteria and prevent the reduction of DMSO to dimethyl sulfide, which would cause pollution. Compared to traditional natural biofilm formation methods, this method can provide a higher concentration of sulfur-containing organic matter safely and odorlessly, rapidly enriching microorganisms capable of degrading organic sulfur pollutants and shortening the biofilm formation time in the bio-trickling filter. Compared to methods that add other inorganic sulfur for biofilm formation, this method is more suitable for treating organic sulfur odor pollutants.

The present invention relates to a method for producing a fermented malt beverage having an ethanol content of less than 1% ABV, said method comprising the steps of: a) preparing an aqueous malt mixture comprising water and malt; b) preparing a mash by saccharifying the aqueous malt mixture; c) separating the mash into wort and spent grains; d) maintaining the wort at a temperature of at least 70 DEG C for at least 5 minutes to produce a heated wort; e) cooling the heated wort to a temperature of less than 30 DEG C to produce a cooled wort; and f) contacting the cooled wort with live yeast at a temperature of less than 7 DEG C for at least 8 hours to produce a fermented wort; wherein the temperature of the wort is maintained below 90 DEG C between steps c) and f); and wherein the wort is prevented from boiling. The invention further relates to a beer having an ethanol content of less than 1% ABV, said beer having a free dimethyl sulfide content of less than 100 g / L and a total dimethyl sulfide content of at least 10 g / L wherein free dimethyl sulfide represents at most 35% of the total dimethyl sulfide content.