34 results about "Ethanethiol" patented technology

The invention discloses a preparation method and application of a monatomic catalyst for catalytic degradation of ethanethiol, and belongs to the technical field of organic sulfur pollutant treatment.The atomic-scale dispersion of Ce species is achieved through HY molecular sieve FAU type topological structure constraint and cerium loading capacity limitation, the catalyst shows atomic-scale active sites, and the catalytic degradation of ethanethiol is achieved. The conversion path of ethanethiol can be accurately regulated and controlled, and efficient degradation of ethanethiol is realized; the topological confinement effect guarantees the stability of the monatomic catalyst, and the HY molecular sieve pore channel restrains migration of Ce atoms and inhibits agglomeration of Ce metal, so that the monatomic catalyst shows good anti-sintering ability, and at the same time, sulfur poisoning and carbon deposition rate are slowed down.

The invention provides a preparation method and application of a catalyst for selective production of ethanethiol. The catalyst comprises an active component, an auxiliary agent and a molded alumina carrier, the active component comprises the following components in percentage by mass: 5-10% of VIII group transition metal oxide and 15-20% of VIB group metal oxide, and the auxiliaries comprise 0.5-4% of alkali metal, 1-3% of alkaline earth metal oxide, 0.6-2% of cerium oxide and 1-4% of phosphorus pentoxide. A bifunctional catalyst with moderate Lewis acid-base sites is constructed by compounding a multi-component aid and an active component, and the catalyst shows excellent catalytic activity that the ethylene conversion per pass is greater than or equal to 98%, the ethanethiol selectivity is about-95% and the ethanethiol yield is-90% under the reaction conditions that the hydrogen sulfide / ethylene feeding mass ratio is 3-5, the temperature is 180-210 DEG C, the pressure is 0.5-1.0 MPa and the volume space velocity is 200-300 h <-1 >. And the catalyst can stably run for 1250 hours or more.

The invention provides a novel silane coupling agent and a preparation method thereof, and belongs to the technical field of silane coupling agents, and the preparation method comprises the following steps: taking chloropropyltriethoxysilane and 2, 2-(1, 2-ethanedioxy) diethyl mercaptan as raw materials, adding a catalyst and an acid-binding agent, mixing, and heating for reaction to obtain the novel silane coupling agent. The invention provides a novel silane coupling agent and a preparation method thereof. The purposes of facilitating industrial production and obtaining high-purity and high-yield products are achieved.

The invention discloses a photocatalytic synthesis method of diethyl disulfide, and relates to the technical field of organic synthesis. The preparation method specifically comprises the following steps: mixing Co (NO3) 2.6 H2O and Ni (NO3) 2.6 H2O, and adding methanol to obtain a solution A; 2-methylimidazole and methyl alcohol are mixed, and a solution B is obtained; mixing the solution A and the solution B to obtain a zeolite imidazole framework material; selenium powder and the zeolite imidazole framework material are mixed and calcined, and a NiCoSe2 material is obtained; the preparation method comprises the following steps: mixing a NiCoSe2 material, ZnCl2, InCl3 and C2H5NS, adding an ethanol water solution, and carrying out microwave hydrothermal synthesis to obtain a NiCoSe2-coated ZnIn2S4 photocatalyst; the NiCoSe2-coated ZnIn2S4 photocatalyst and ethanethiol are subjected to a photocatalytic reaction under N2 atmosphere protection and visible light irradiation, and diethyl disulfide and hydrogen are generated. The method is mild in reaction condition and high in product stability.

The invention relates to a composition for a PSE elastomer, the PSE elastomer and a preparation method of the PSE elastomer, and belongs to the technical field of high polymer material science and engineering. The composition comprises the following components in percentage by mass: 72 to 80 weight percent of PUSH resin, 19 to 28 weight percent of bisphenol A epoxy resin and 0.3 to 1 weight percent of accelerant, wherein the PUSH resin is obtained by polymerizing isocyanate, a combination A and 2, 2 '-(1, 2-ethanedioxy) diethyl mercaptan according to a molar ratio of 1: (0.4-0.6): (0.9-1.1), and the combination A is prepared from polypropylene glycol and polyether triol according to a molar ratio of 1: (0.3-4). The PSE elastomer provided by the invention has excellent comprehensive damping performance and especially has a wider damping temperature range.

This invention discloses a compound, octanoic acid 4-methyl-5-thiazole ethyl mercaptan ester, with the specific chemical structure shown below: The aromatic compound is mainly used in food flavorings.

The invention relates to the field of chemical synthesis, in particular to a novel method for synthesizing beta-ethylthiobutyraldehyde, which comprises the following steps: S1, adding an anhydrous polar aprotic solvent which is dried by a 4A molecular sieve and subjected to nitrogen bubbling for 30 minutes to remove oxygen into a reactor provided with an external circulation cooling system under the conditions that the illumination intensity is less than or equal to 50lux in an amber glass reactor, and reacting for 1-2 hours at the temperature of 20-30 DEG C; the water content of the anhydrous polar aprotic solvent is less than or equal to 0.01%, the oxygen content of the anhydrous polar aprotic solvent is less than 5ppm, tetrahydrofuran, diethyl ether or methyl tert-butyl ether is selected as the solvent, the use amount of the solvent is 4 times of the mass of ethanethiol, ethanethiol with the purity of more than or equal to 99% and crotonaldehyde are added according to the molar ratio of 1: (1.05-1.2), high-purity nitrogen is introduced for replacement three times, the nitrogen micro-positive pressure is maintained in the whole process, and the temperature is controlled to be less than or equal to 10 DEG C through external circulation. According to the method, production can be performed in a low-temperature environment, triethylamine serving as a catalyst is not needed, so that unit consumption is lower, and the synthesized beta-ethylthiobutyraldehyde is more stable, less in decomposition and higher in yield and content due to low synthesis temperature.

The application belongs to the technical field of medicine synthesis, and particularly relates to a 5H-dibenzo[a,d]cycloheptatriene-5-ketone intermediate compound and a method for preparing 5H-dibenzo[a,d]cycloheptatriene-5-ketone. The method uses SM-1 as a starting material, reacts with ethanethiol first, and then is coupled with SM-2 to obtain the intermediate compound I-2, and the compound I-2 can be reacted for one step under the action of a catalyst to obtain 5H-dibenzo[a,d]cycloheptatriene-5-ketone. The preparation method solves the problems of complex operation and high toxicity in the prior art, is simple to operate, the obtained product has high yield and purity, the reaction period is short, and is suitable for industrial production.

The invention discloses a method for analyzing a polymeric lignin structural unit in watermelon peel, and belongs to the technical field of biological substance composition determination methods, the method comprises the following steps: S1, protective pretreatment: mixing a watermelon peel sample with a protective solution containing triphenylmethyl mercaptan; s2, thioacidolysis: adding a reaction solution containing boron trifluoride and ethanethiol, and heating for depolymerization; s3, in-situ neutralization and derivatization: adding a buffer solution, extracting and drying to obtain an organic phase, and then adding a silanization reagent for derivatization reaction; s4, qualitative and quantitative analysis; through the multi-level design of structure protection, efficient derivation and system integration, the established analysis method shows remarkable advantages in the aspects of inhibiting condensation reaction, improving operation safety, shortening analysis period and realizing quantification, effectively overcomes the technical bottlenecks of low recovery rate, high toxicity, long time consumption, incomplete detection and the like in the prior art, and has wide application prospects. And an excellent technical scheme is provided for composition analysis of the plant polymerized lignin.

The present application relates to an antiperovskite cathode material and a preparation method thereof, and a lithium-ion battery, belonging to the technical field of lithium batteries. The preparation method comprises: mixing a metal salt containing metal M with ethanethiol and water, performing a hydrolysis reaction to obtain a product solution; adjusting the pH of the product solution to 2-4, adding a metal salt containing metal N, lithium ethoxide, a polymerization monomer, a crosslinking agent, and an initiator to the product solution for polymerization reaction to generate a wet gel; drying the wet gel and then heat-treating it to obtain an antiperovskite cathode material Li2M x N y Through this preparation method, the internal particle size of the positive electrode material can be made smaller and the internal particle distribution more uniform, thereby improving the cycle performance and rate performance of the lithium-ion battery.

The application discloses a compound, 4-methyl-5-thiazole ethyl mercaptide heptanoate, and a specific chemical structural formula is shown in the following formula: the aromatic compound is mainly applied to food essence.

The invention belongs to the field of chemical technology innovation, and relates to a preparation method of an ethanethiol catalyst synthesized by an ethylene vulcanization method. The catalyst is composed of a lanthanide metal modified alumina carrier and a transition metal, and shows excellent ethylene vulcanization addition activity in a pressure interval of 1.2-1.8 MPa and a temperature interval of 150-220 DEG C, the ethylene conversion rate reaches 99.5% or above, and the yield of ethanethiol reaches 93% or above.

The invention discloses an ethanethiol synthesis process based on cyclic utilization of hydrogen sulfide, simultaneously constructs a corresponding hydrogen sulfide dual-cycle recovery system, and belongs to the technical field of organic sulfur compound synthesis. The method mainly comprises the following steps: (1) synthesizing crude ethanethiol from a hydrogen sulfide (H2S) raw material and ethylene (CH2CH2) in a synthesis reaction system under the action of a catalyst; (2) pressurizing and liquefying unreacted hydrogen sulfide (H2S) tail gas after synthesis and condensation, and then returning the tail gas to a synthesis reaction system for recycling; and (3) separating and purifying the light component containing hydrogen sulfide (H2S) after rectification and light component removal, and then circulating to a raw material unit. The total utilization rate of H2S is greater than or equal to 98% through the circulating system, the raw material cost is reduced by more than 40%, the exhaust emission is reduced by 90%, and the problems of environmental pollution and resource waste caused by direct emission of H2S in the traditional process are effectively solved.

The application discloses a compound, 4-methyl-5-thiazole ethanethiol ester of decanoic acid, and a specific chemical structural formula is shown in the following formula: the aromatic compound is mainly applied to food essence.

The invention provides a preparation method of diethylaminoethanethiol, which comprises the following step: enabling gaseous episulfide ethane and gaseous diethylamine to be in contact for reaction to obtain reaction liquid containing diethylaminoethanethiol. The preparation method of the diethylaminoethanethiol provided by the invention is simple and convenient to operate, and the diethylaminoethanethiol can be obtained with high yield and high purity.

The utility model discloses a 2-ethylthio-3-chloro-trifluorotoluene production device which comprises a DMF (Dimethyl Formamide) head tank, an ethanethiol head tank, a 2-fluoro-3-chloro-trifluorotoluene feeding pipe and an etherification reaction kettle, the etherification reaction kettle comprises a reaction kettle main body, a cooling jacket is arranged on a shell of the reaction kettle main body, and the cooling jacket is connected with the etherification reaction kettle. And a built-in cooling coil pipe is arranged in the shell of the reaction kettle main body. The etherification reaction kettle has the advantages that the built-in cooling coil pipe is additionally arranged on the basis of cooling of the jacket of the shell, frozen saline water can be fed into the etherification reaction kettle through the built-in cooling coil pipe, then heat released by reaction is directly taken away in time, solvent volatilization is reduced, meanwhile, side reaction can be effectively inhibited, and the service life of the etherification reaction kettle is prolonged. Impurities are reduced, and the yield of the intermediate is improved. In addition, the solvent volatilized along with the tail gas is condensed through the first condenser to be recycled, and the recycling rate of the solvent is increased.

The invention discloses an application of capsaicin in improving fish meat quality, and belongs to the technical field of aquaculture. The improvement of the fish meat quality by capsaicin is realized by improving the meat yield, increasing the crude protein content, slowing down the pH decreasing amplitude, reducing the cooking loss, improving the hardness, improving the freshness, increasing the sweet taste and the salty taste, inhibiting the generation of methyl mercaptan and ethanethiol, promoting the synthesis of fresh flavor substances, increasing the contents of ATP, Ca < 2 + >-Mg < 2 + >-ATPase, creatine kinase, HK and glycogen and reducing the lactic acid content. By adding low-dose capsaicin into the fish feed for feeding fish, the flavor quality of aquatic products can be effectively improved, and technical support is provided for application of low-dose natural additives in the field of aquatic product preservation and aroma enhancement.

This invention provides a fluorine-free silicone-containing waterproofing agent, its preparation method, and its application, belonging to the technical field of textile functional finishing agents. The fluorine-free silicone-containing waterproofing agent provided by this invention comprises, by mass percentage: 10-15% modified silicone resin, 10-15% modified polysiloxane, 1-5% surfactant, 5-10% organic solvent, and the balance being water. This invention modifies the silicone resin using 2-(trimethylsilane)ethanethiol and 3-chloro-1-propanethiol, introducing shorter-chain hydrophobic groups and polar groups with stronger hydrophobicity. Simultaneously, the modified silicone resin is dissolved using polysiloxane modified with shorter-chain hydrophobic groups, thereby improving the waterproofing and wash resistance of the fluorine-free silicone-containing waterproofing agent.

The present invention provides a fluorescent flexible tensile sensor, a preparation method, and applications thereof. The method comprises: dissolving 1,4-bis-[4-(3-acryloxypropoxy)benzoyloxy]-2-methylbenzene, 2,2′-(1,2-ethylenedioxy)bis-ethanethiol, and pentaerythritol mercaptopropionate in a solvent to obtain a RM mixture; adding an aggregation-induced luminescence material and a catalyst to the RM mixture to carry out a catalytic polymerization reaction to obtain a reaction mixture; curing the reaction mixture in a mold, and drying and removing the solvent to obtain a fluorescent flexible tensile sensor. The present invention combines the aggregation-induced luminescence material with a liquid crystal elastomer through a cross-linking reaction to prepare a wireless force sensor that is flexible, highly stretchable, and wirelessly resistant to electromagnetic interference, and is low in cost and lightweight.

The invention particularly relates to a preparation method of N, N-diethylaminoethanethiol in the technical field of medicines, and the preparation method comprises the following steps: ethylene carbonate and thiourea react to generate episulfide ethane, and the episulfide ethane in a gas state and diethylamine are mixed by a micro-nano bubble device and enter a tower reactor to react to prepare the N, N-diethylaminoethanethiol. The preparation method of the N, N-diethylaminoethanethiol is continuous in production, clean in process, free of emission of toxic and odorous ethane episulfide, free of self-polymerization, high in product yield, good in purity, low in cost and suitable for industrial production.

The application discloses a compound hexanoic acid 4-methyl-5-thiazole ethyl mercaptide, and a specific chemical structural formula is shown in the following formula: the aromatic compound is mainly applied to food essence.

The invention provides a fluoride-free silicon-containing waterproof agent and a preparation method and application thereof, and belongs to the technical field of textile functional finishing agents. The fluoride-free silicon-containing waterproof agent provided by the invention comprises the following components in percentage by mass: 10-15% of modified silicon resin, 10-15% of modified polysiloxane, 1-5% of a surfactant, 5-10% of an organic solvent and the balance of water. Silicon resin is modified through 2-(trimethylsilane) ethanethiol and 3-chloro-1-propanethiol, a short-chain hydrophobic group and a polar group which are higher in hydrophobicity are introduced, meanwhile, polysiloxane modified by the short-chain hydrophobic group is adopted for dissolving the modified silicon resin, and the waterproofness and the washability of the fluorine-free silicon-containing waterproof agent are improved.

The application discloses a compound nonanoic acid 4-methyl-5-thiazole ethyl mercaptide, and a specific chemical structural formula is shown in the following formula: the aromatic compound is mainly applied to food essence.

This invention discloses an analytical method for polymeric lignin structural units in watermelon rind, belonging to the technical field of biomaterial composition determination methods. The method includes the following steps: S1, protective pretreatment: mixing the watermelon rind sample with a protective solution containing triphenylmethanethiol; S2, thioacid hydrolysis: adding a reaction solution containing boron trifluoride and ethanethiol, followed by heating to depolymerize; S3, in-situ neutralization and derivatization: adding a buffer solution, extracting and drying to obtain the organic phase, then adding a silanizing reagent for derivatization; S4, qualitative and quantitative analysis. This invention, through a multi-level design of structure protection, efficient derivatization, and system integration, establishes an analytical method that exhibits significant advantages in inhibiting condensation reactions, improving operational safety, shortening the analysis cycle, and achieving quantification. It effectively overcomes the technical bottlenecks of existing technologies, such as low recovery rate, high toxicity, long processing time, and incomplete detection, providing an excellent technical solution for the analysis of the composition of plant polymeric lignin.

The invention discloses a foam liquid crystal elastomer for enhancing energy absorption by utilizing microsphere-induced shear deformation as well as a preparation method and application thereof, and relates to the technical field of liquid crystal elastomers. The preparation method of the foam liquid crystal elastomer comprises the following steps: mixing 2-methyl-1, 4-phenylene bis (4-(3-(acryloyloxy) propoxy) benzoate with methylbenzene, heating until the mixture is completely dissolved, adding 2, 2 '-(1, 2-ethanedioxy) diethyl mercaptan and tetrakis (3-mercaptopropionic acid) pentaerythritol ester, and uniformly stirring to obtain a liquid crystal elastomer solution; heating and expanding the microspheres, adding a liquid crystal elastomer solution in a heat preservation state, and uniformly stirring, or directly adding the microspheres into the liquid crystal elastomer solution at 85 DEG C, heating, and uniformly stirring; adding a catalyst or a photoinitiator, and uniformly stirring to obtain a foam liquid crystal elastomer solution; and pouring the foam liquid crystal elastomer solution into a mold, curing, and demolding to obtain the foam liquid crystal elastomer with high-strength energy absorption capacity.

The utility model discloses an ethanethiol continuous rectification small-scale test device which is characterized in that in a hydrogen sulfide removal unit, a middle branch opening of a reaction bottle I is connected with a spherical condensation pipe by adopting an adapter, and an outlet of the spherical condensation pipe is connected with a conical flask I through a vacuum tail connecting pipe I; in the ethanethiol rectification unit, the speed of materials flowing into a second reaction bottle from a first reaction bottle is controlled through the opening degree of two cocks on a second guide pipe, a middle branch opening of the second reaction bottle is connected with the lower end of a filler-containing vertical thorn fractionating column, and the upper end of the filler-containing vertical thorn fractionating column is connected with a snake-shaped condensation pipe through a distillation head. The tail end of the snake-shaped condenser pipe is connected with a vacuum tail connecting pipe II, and the lower end of the vacuum tail connecting pipe II is connected with a middle sample receiving bottle and then connected with a sample receiving bottle. And taking the ethanethiol liquid-phase crude product condensed in the synthesis section as a raw material, degassing and rectifying to obtain an ethanethiol product. According to the technology, a small glass rectification device is adopted for continuous rectification, and the device comprises a hydrogen sulfide removal unit, an ethanethiol rectification unit and a tail gas absorption unit.

The present application relates to a kind of solid adsorbents and its preparation method.Solid adsorbent is made of porous solid carrier and load two parts.Porous solid carrier includes molecular sieve, silica gel, alumina, hydrotalcite and its derivatives.Load is made of main agent and auxiliary agent, wherein main agent is the polyamide-amine of amine group and hydroxyl group modified end group, and the molar ratio of amine group and hydroxyl group is 1:1-1:1.5;Auxiliary agent is one or several of AMP, hydroxyethylpiperazine (HPZ), 1,8-diazabicyclo (7-undecene) (DBU), sulfolane (TS).Load is 25%-150% of the weight of porous solid carrier, and the mass fraction of main agent in load is 35%-80%.The present application has selective adjustable, adsorption speed is fast, adsorption capacity is large, and the removal rate of COS, methyl mercaptan, ethyl mercaptan and other organic sulfur is high.

The invention provides a fire alarm mycelium material and a preparation method and application thereof, and belongs to the technical field of fire alarm materials, and the fire alarm mycelium material comprises hemp stalks, ganoderma lucidum, ethanethiol and the like. The preparation method of the mycelium material comprises the following steps: carrying out mixed culture on a hemp stalk culture material and ganoderma lucidum; dissolving polyvinyl alcohol and lauryl sodium sulfate in deionized water; adding ethanethiol and polymethyl methacrylate into an organic solvent; dropwise adding the water phase into the oil phase, and emulsifying to obtain ethanethiol microcapsules; and mixing the pure mycelium material with ethanethiol microcapsules, culturing, and demolding to obtain the fire alarm mycelium material. According to the invention, intrinsic integration of a material structure and an early warning function is realized through a mycelium biological assembly and microcapsule embedding and fixing technology, so that the material becomes a sensing unit. According to the material, rapid and active fire early warning without external energy is realized by utilizing the temperature-triggered fracture characteristic of the microcapsules and the extremely low odor threshold value of ethanethiol.

The present invention provides a method for synthesizing natural-identical raspberry ketone, belonging to the field of pharmaceutical synthesis. Using natural anisaldehyde and natural acetone as starting materials, the final natural-identical raspberry ketone is obtained through three consecutive reactions: Claisen-Schmidt condensation catalyzed by basic resin, enzymatic reduction, and demethylation with sodium ethanethiolate. The preparation method of the present invention is safe, clean, and has a stable yield, reaching about 85%, providing a basis for industrial continuous production. The preparation method of the present invention not only meets the requirements of clean production but also saves labor costs by virtue of the continuous process, and is suitable for large-scale industrial production.

The present invention relates to a process for the preparation of lyophilized 2-[(3-aminopropyl)amino]ethanethiol comprising the following steps: a) reacting an amifostine solution with a strong acid to obtain a 2-[(3-aminopropyl)amino]ethanethiol solution, and b) lyophilizing the 2-[(3-aminopropyl)amino]ethanethiol solution, with or without the addition of excipients.