387 results about "Methyl acetate" patented technology

The invention discloses a preparation method of EVOH, and relates to the technical field of EVOH. By constructing a methanol / methyl acetate binary complex solvent system and combining the dynamic characteristics of the polymerization reaction, a strategy of staged gradient regulation and control of the solvent composition proportion is implemented, the volume ratio of methanol to methyl acetate is dynamically regulated at different stages of the polymerization reaction, and the free radical polymerization self-acceleration phenomenon is inhibited; compared with the traditional single solvent polymerization process, the prepared EVOH has the characteristics of high molecular weight, narrow molecular weight distribution and high product quality.

The invention discloses a wear-resistant vehicle body film and a preparation method thereof, and relates to the technical field of films. The wear-resistant automobile body film prepared by the invention is prepared from polytetrahydrofuran ether glycol, isophorone diisocyanate, a catalyst, dihydric alcohol quaternary ammonium salt, a functional aid, modified silicon dioxide and a chain extender. The dihydric alcohol quaternary ammonium salt is obtained by reacting N, N '-dihexyl-N, N'-dimethyl propane-1, 3-diamine with monochloroacetone and then condensing with glycerol; the functional additive is obtained by reacting 2-boric acid thiophene-4-methyl acetate with 2, 7-dibromofluorene and then carrying out bromination hydrolysis; the modified silicon dioxide is obtained by reacting pretreated silicon dioxide with melamine and then reacting with sodium hypophosphite. The wear-resistant vehicle body film prepared by the invention has good anti-aging, wear-resistant, antibacterial and flame-retardant properties.

The invention discloses a short c-axis flaky mordenite molecular sieve as well as a preparation method and application thereof, and belongs to the technical field of molecular sieves. The chemical composition of the short c-axis flaky mordenite molecular sieve is Ra.Mb. (SixAly) O2, r is a template agent tetraethylammonium ion; a is the mole number of R in each mole of (SixAly) O2, and a is more than or equal to 0.02 and less than or equal to 0.04; m is an alkali metal ion; b is the mole number of M in each mole of (SixAly) O2, and b is more than or equal to 0.02 and less than or equal to 0.06; x is the mole fraction of Si in each mole of (SixAly) O2, and x is more than or equal to 0.9 and less than or equal to 0.97; y is the mole fraction of Al in each mole of (SixAly) O2, y is more than or equal to 0.03 and less than or equal to 0.1, and x + y is equal to 1; and the dimension thickness of the stone molecular sieve in the c-axis direction is 20-80 nanometers. The molecular sieve shows excellent catalytic performance in a catalytic reaction for preparing methyl acetate through dimethyl ether carbonylation.

The invention discloses an electrolyte suitable for high-rate charge-discharge and low-temperature circulation and a lithium metal battery, and belongs to the technical field of lithium batteries. The electrolyte comprises the lithium salt, the additive and the cosolvent mixture, the cosolvent mixture is composed of the methyl acetate, the methyl difluoroacetate and the fluoroethylene carbonate, and due to the synergistic effect of a mixed solvent system, the electrolyte can have high high voltage resistance and oxidation resistance; meanwhile, a low-impedance electrode electrolyte phase interfacial film rich in inorganic matter LiF can be formed, rapid desolvation of Li < + > is promoted, the rate capability and the low-temperature performance of the battery are further remarkably improved, and the battery can also normally work at the high rate of-30 DEG C and 2C. The preparation raw materials of the electrolyte are cheap and easy to obtain, the preparation process is simple and convenient, and a thought is provided for industrial production of the low-temperature electrolyte.

The invention relates to a multifunctional tandem catalytic process for directly preparing methyl acetate / ethanol from synthesis gas. According to the process, a novel catalyst for preparing dimethyl ether from synthesis gas is prepared by adopting an impregnation method, and after the catalyst is sequentially connected with a dimethyl ether carbonylation catalyst and a hydrogenation catalyst in series, efficient directional synthesis of methyl acetate and ethanol is realized in a double-bed or three-bed sequential filling form. According to the invention, high CO conversion per pass, high methyl acetate selectivity and low acetic acid selectivity can be realized, and the problems of corrosion and difficult conversion of a subsequent hydrogenation system are effectively avoided; the multifunctional catalytic system provided by the invention is simple in preparation method and easy to realize industrial large-scale production.

The invention discloses a preparation method of methyl propionate, and belongs to the technical field of methyl propionate. The preparation method of methyl propionate comprises the following steps: S1, preheating methyl acetate, formaldehyde and methanol to 350-380 DEG C, then feeding into a fixed bed reactor, and reacting at 350-400 DEG C under the action of a synthetic catalyst to obtain a reaction solution; and S2, mixing the reaction liquid obtained in the step S1 with hydrogen, feeding the mixture into a hydrogenation reactor, obtaining a product under the action of a hydrogenation catalyst, and rectifying and separating the product after the hydrogenation reaction to obtain methyl propionate. Compared with the prior art, the preparation method provided by the invention is simpler and more efficient, and the yield of methyl propionate is improved.

Disclosed herein is an electrolyte solution comprising: (a) about 5 wt % to about 60 wt % of a fluorinated ester; (b) greater than 0 wt % to less than 100 wt % of at least one solvent selected from fluoroethylene carbonate, difluoroethylene carbonate, ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate, methyl (2,2,2-trifluoroethyl) carbonate, propylene carbonate, trifluoropropylene carbonate, butylene carbonate, methyl acetate (MA), ethyl acetate (EA), methyl propanoate (MP); (c) at least one salt; wherein the wt % is calculated based on a total weight of a) and b); and wherein the electrolyte solution is substantially free of ethylene carbonate (EC). Also disclosed are batteries comprising such electrolytes. Also disclosed are methods of making the disclosed herein electrolytes and batteries.

The invention discloses a benzene-free environment-friendly plastic printing ink diluent and a preparation method thereof, and relates to the field of chemical engineering. The environment-friendly flame retardant is prepared from the following components in parts by weight: 10 to 25 parts of ethyl acetate, 8 to 15 parts of refined methyl acetate, 5 to 10 parts of butyl acetate, 10 to 30 parts of dimethyl carbonate, 6 to 15 parts of methylal, 10 to 20 parts of propyl acetate, 2 to 7 parts of dibasic acid ester, 3 to 10 parts of propylene glycol monomethyl ether, 7 to 15 parts of isopropanol and 3 to 9 parts of propylene carbonate. According to the present invention, the ethyl acetate, the dimethyl carbonate and other benzene-free solvents are adopted to replace the traditional benzene-series solvent, such that the benzene-free environmental protection target is achieved, the environmental residue and the human health risk are substantially reduced, in addition, the propylene carbonate, the dibasic acid ester and the like in the formula further have the biodegradability, the environmental protection performance of the diluent is further improved, and the environmental protection performance of the diluent is further improved. The cost of the prepared benzene-free environment-friendly plastic printing ink diluent is remarkably reduced compared with that of an imported diluent.

The invention belongs to the technical field of microorganisms, and particularly relates to pediococcus acidilactici ZF627 and application thereof. The invention provides a Pediococcus acidilactici ZF627, which has high salt resistance and high ester yield, is used for fermented soya bean fermentation, and can significantly increase the content of various key volatile compounds in fermented soya beans, including the total content of flavor substances such as alcohols, aldehydes, acids and furans, especially the content of key flavor compounds such as isoamyl alcohol, ethyl acetate and methyl acetate. The pediococcus acidilactici ZF627 is used for fermenting the fermented soya beans, so that the flavor, taste and aroma coordination of the fermented soya beans can be remarkably improved, the overall aroma and flavor of the fermented soya beans are improved, the flavor and taste of the fermented soya beans are more complex and multi-layered, and the flavor and overall quality of the fermented soya beans are remarkably improved.

The application discloses a catalyst for preparing methyl acetate or ethanol by hydrogenation of dimethyl oxalate and a preparation method thereof. The catalyst comprises an active component, an auxiliary component and a carrier. The active component is a single substance or an oxide of Cu, the auxiliary component is a single substance or an oxide of W, the high active site is a Cu-W alloy interface and single Cu and W metals, and the carrier is one or more than two of silicon dioxide, aluminum oxide, zirconium oxide, zinc oxide, magnesium oxide and cerium oxide. The copper-tungsten alloy catalyst provided by the application has the advantages of structural stability, high mechanical strength, good heat conduction performance, high substrate conversion rate and high product selectivity. The preparation method is simple in steps, easy in raw material acquisition, low in cost, green in pollution, good in preparation repeatability and easy in scale production. The catalyst has extremely high stability and catalytic activity in the reaction of preparing methyl acetate or ethanol by hydrogenation of dimethyl oxalate, high ethanol or methyl acetate yield and high active component utilization rate.

The utility model discloses a raw material pretreatment device for methyl acetate production, which comprises a reaction cylinder, a sealing cover is arranged at the position of an opening at the upper end of the reaction cylinder, a partition plate is fixedly connected inside the reaction cylinder, the inside of the reaction cylinder is divided into a mixing bin and a waste gas bin through the partition plate, the mixing bin is positioned below the waste gas bin, and the waste gas bin is positioned below the mixing bin. Waste liquid is guided into the mixing bin through the water inlet pipe, waste gas is guided into the gas spraying pipe through the gas inlet pipe, the waste gas is sprayed into the waste liquid at a high speed through the nozzles on the gas spraying pipe, the motor is started at the same time, and the waste liquid is sprayed into the mixing bin through the gas spraying pipe. And the rotating column is driven to rotate to drive the stirring rod to stir the waste liquid, so that the waste gas entering the waste liquid can be quickly mixed with the waste liquid, the speed of dissolving methyl acetate in the waste gas into the waste liquid is accelerated, and the pretreatment efficiency of the methyl acetate raw material is effectively improved.

The invention belongs to the field of pesticide preparation, and particularly relates to an improved preparation method of 2-(2 '-bromomethyl phenyl)-2-carbonyl methyl acetate. 2-oxo-2-(o-tolyl) ethyl acetate is used as a raw material and is sequentially subjected to oximation reaction, structure transposition treatment, bromination reaction and polybrominated substance to monobromination reaction, and finally 2-(2 '-bromomethyl phenyl)-2-carbonyl methyl acetate is obtained. Wherein the structure transposition treatment comprises the following steps: by taking an oximation product as a substrate, introducing a catalyst under a system anhydrous condition to realize conversion from a Z configuration to an E configuration; the polybrominated substance to monobrominated product conversion reaction comprises the following steps: dissolving a brominated product in THF, then adding dimethyl phosphite and diisopropylethylamine, and carrying out a reaction to realize conversion of the polybrominated substance into a monobrominated product. According to the method, the conversion of polybrominated substance impurities into monobrominated products is optimized through process improvement, so that the yield of the target product is improved, and the method is simple to operate, few in by-products and suitable for industrial production.

The invention relates to the technical field of household fabrics, and particularly discloses a polypropylene elastic non-woven fabric and a preparation method thereof. The polypropylene elastic non-woven fabric is mainly prepared from the following raw materials in parts by weight: 100 parts of polypropylene, 10-20 parts of an ethylene-octylene copolymer, 2-4 parts of maleic anhydride grafted polypropylene, 1-3 parts of modified nano silicon dioxide and 0.5-2 parts of an antioxidant. The modified nano silicon dioxide is obtained by treating nano silicon dioxide with 3-trimethoxy silane propyl acrylate, oleamide and 2-(4-vinyl phenyl) methyl acetate. Through mutual cooperation of the raw materials, the non-woven fabric has the characteristics of high breaking strength, high elongation at break and high wear resistance, shows excellent comprehensive performance, and can meet the requirements of the non-woven fabric as spring wrapping cloth.

Improved battery systems have been developed for lithium-ion based batteries. The improved battery systems consist of two-additive mixtures in an electrolyte solvent that is a carbonate solvent, an organic solvent, a non-aqueous solvent, and / or methyl acetate. The positive electrode of the improved battery systems may be formed from lithium nickel manganese cobalt compounds, and the negative electrode of the improved battery system may be formed from natural or artificial graphite.

A process for producing and recovering acetic acid in an acetic acid production system is disclosed, the process comprising contacting methanol, methyl acetate, or a mixture of the two, and carbon monoxide in the presence of a reaction mixture comprising iodide under carbonylation conditions sufficient to form acetic acid. The reaction mixture comprises a carbonylation catalyst, water, and one or more promoters selected from the group consisting of Group I and Group II polyphosphate and polyphosphonate salts and mixtures thereof. An aspect of the process includes a method for reducing water in the acetic acid production process.

The invention belongs to the technical field of lithium batteries, and relates to a lithium ion battery, in particular to a phosphate battery with both battery rate capability and safety performance. The lithium ion battery comprises a positive plate, a negative plate, a diaphragm and a non-aqueous electrolyte, the positive plate comprises a positive electrode material layer containing a phosphate material; the organic solvent comprises a first solvent, and the first solvent is selected from at least one of methyl acetate, ethyl acetate and methyl propionate; the lithium salt comprises LiPF6 and LiFSI; the first additive comprises a compound as shown in a structural formula 1; the lithium ion battery satisfies 0.02 < = 10c / a + e < = 1.8, 40 < = a < = 60, 1.1 < = b < = 1.5, 0 < e < = 1.5, and 0.05 < = c < = 2. According to the lithium ion battery provided by the invention, high-concentration LiPF6, low-content LiFSI and high-content carboxylic ester are matched with one another, so that the compatibility of rate capability and safety performance of a phosphate battery is realized.

A secondary battery 100 disclosed herein includes a negative electrode 60 and a nonaqueous electrolytic solution 80. The negative electrode 60 includes a negative electrode active material layer 64 containing a negative electrode active material. The negative electrode active material includes a carbon material and an amorphous carbon coat layer covering the carbon material. The negative electrode active material has a strength ratio (D / G) of a peak strength G at 1580 cm−1 and a peak strength D at 1360 cm−1 under a Raman spectrum analysis is equal to or more than 0.3 and not more than 0.5. The nonaqueous electrolytic solution 80 contains at least a sulfur type electrolyte salt and a nonaqueous solvent, and a nonaqueous solvent contains a carbonate type solvent and methyl acetate. A SOx concentration of the negative electrode active material layer 64 is equal to or more than 0.3 atomic %.

A process for producing and recovering acetic acid in an acetic acid production system is disclosed, the process comprising contacting methanol, methyl acetate, or a mixture of the two, and carbon monoxide in the presence of a reaction mixture comprising iodide under carbonylation conditions sufficient to form acetic acid. The reaction mixture comprises a carbonylation catalyst, water, and one or more promoters selected from the group consisting of Group I and Group II aminopolycarboxylate salts and mixtures thereof. An aspect of the process includes a method for reducing water in the acetic acid production process.

The invention provides a polymer framework ink, a polymer framework and cell-loaded gel collaborative 3D printing method and a structural body. The polymer framework ink contains a high-molecular polymer, an organic solvent and organic modified synthetic flaky silicate, wherein the organic solvent comprises a first solvent and a second solvent, the first solvent is an ethanol aqueous solution and / or absolute ethyl alcohol, and the second solvent is methyl acetate and / or isoflurane. The polymer framework ink provided by the invention is rapidly cured through direct volatilization of the organic solvent; the flake silicate is synthesized through organic modification, so that higher fidelity is obtained, and the effect of rapid shaping is achieved while curing is carried out; different sizes of pores in the polymer filaments can be obtained by controlling the temperature difference between the polymer frame ink and the environment; finally, collaborative printing of the polymer framework and the cell-carrying gel can be realized under mild conditions, and the activity of cells is ensured.

The invention provides a white flower salvia miltiorrhiza composition and application thereof in medicines for preventing and treating atherosclerosis, and belongs to the technical field of traditional Chinese medicines. According to the technical scheme, the composition is characterized by comprising 3-5 parts of white flower salvia miltiorrhiza root slices, 1-2 parts of white flower salvia miltiorrhiza dried leaves and 1-2 parts of white flower salvia miltiorrhiza extract. Mixing the white flower salvia miltiorrhiza leaf powder with a malic acid aqueous solution, carrying out ultrasonic treatment, filtering, and carrying out alcohol precipitation on filtrate to obtain an alcohol precipitate; extracting the white flower salvia miltiorrhiza root powder by using supercritical carbon dioxide to obtain a supercritical extract; mixing the alcohol precipitate and the supercritical extract according to the weight ratio of (7-9): (1-3) to obtain a white flower salvia miltiorrhiza extract; the alcohol used in the alcohol precipitation is methanol; methyl acetate is used as an entrainer in the supercritical carbon dioxide extraction. The white flower salvia miltiorrhiza composition provided by the invention has the beneficial technical effect of remarkably improving atherosclerosis.

The present invention relates to a synthetic method of 2-methyl-α-methoxyiminophenylacetic acid methyl ester, and the method flow comprises the following: Step 1: using o-methylphenylacetic acid or o-methylphenylacetamide or o-methylphenylacetic acid methyl ester as raw material, first directly oximating and esterifying with sodium nitrite in sulfuric acid in a solvent; Step 2: "one-pot method" hydrogenation of sodium hydroxide or potassium hydroxide to control pH value, and reacting with dimethyl sulfate to obtain 2-methyl-α-methoxyiminophenylacetic acid methyl ester. The present invention uses o-methylphenylacetic acid or o-methylphenylacetamide or o-methylphenylacetic acid methyl ester as raw material, and adopts safe and reliable sodium nitrite as oximation reagent, avoids using nitrite esters that are flammable and explosive, avoids using expensive methoxyamine hydrochloride, has safe and reliable reaction, low raw material cost, and adopts "one-pot method" in the operation process, has simple and smooth process, mild reaction conditions, and is suitable for industrialized amplification production.

The invention discloses a preparation method and application of a dimethyl ether carbonylation catalyst, and belongs to the field of industrial catalysis. According to the method, monobasic inorganic acid and polybasic carboxylic acid are respectively used for preparing a wet material, then the monobasic inorganic acid and the polybasic carboxylic acid are mixed together and kneaded together, and finally the formed H-MOR molecular sieve catalyst is prepared through the procedures of extrusion molding, exchange, drying and roasting in sequence. The method is beneficial to improving the strength and diffusivity of the catalyst, so that the catalytic activity and stability of the catalyst are improved. In the reaction of preparing methyl acetate through dimethyl ether carbonylation, the catalytic activity and the stability are both improved.

The invention discloses a machine learning assisted acetic acid reaction rate prediction model training method and device and a prediction method. The machine learning assisted acetic acid reaction rate prediction model training method comprises the following steps: acquiring an enhanced data training set; extracting a training feature vector of the enhanced data training set; obtaining a classification promotion regression model for the acetic acid reaction rate; and training the classification lifting regression model for the acetic acid reaction rate through the feature vectors for training so as to obtain the trained classification lifting regression model for the acetic acid reaction rate. According to the method, a model relationship between input characteristics and acetic acid reaction rates (including reactant mass, catalyst mass, methyl acetate concentration and the like) is established through training set learning. A user can directly obtain the prediction result of the acetic acid reaction rate by inputting the characteristic variables.

The invention relates to a catalyst for preparing methyl acrylate through condensation of methyl acetate and formaldehyde, a preparation method of the catalyst and a preparation method of the methyl acrylate, and discloses the catalyst for preparing the methyl acrylate through condensation of the methyl acetate and the formaldehyde, and the catalyst comprises a zirconium-containing modified silicon dioxide carrier and an active component; the active component comprises an alkaline active center and an acidic active center; the catalyst is applied to a method for preparing methyl acrylate through condensation of methyl acetate and formaldehyde, the supply amount of a formaldehyde monomer provided by a formaldehyde source and the ratio of methyl acetate to methanol are controlled, and the formaldehyde source is depolymerized into monomer formaldehyde by adopting a depolymerization reactor, so that the methyl acetate and formaldehyde can be catalyzed to perform two-stage condensation reaction at the same time; and the product yield of methyl acrylate is effectively improved.

The invention discloses a battery monomer, a battery device and a power utilization device. Each battery monomer comprises a positive pole piece, a negative pole piece, electrolyte and an isolating membrane arranged between the positive pole piece and the negative pole piece; the positive pole piece comprises a positive pole current collector and a positive pole film layer arranged on at least one side of the surface of the positive pole current collector, the positive pole current collector comprises a positive pole current collecting part and a positive pole lug arranged on at least one side of the side surface of the positive pole current collecting part, and the width of the positive pole current collecting part is 62-98 mm; the electrolyte comprises a solvent and an electrolyte salt, the solvent comprises a chain carboxylic ester solvent, the chain carboxylic ester solvent comprises one or more of ethyl acetate and methyl acetate, and based on the total mass of the solvent, the total mass of the ethyl acetate and the methyl acetate accounts for 5%-80%; and the lithium ion conductivity of the electrolyte is 10 mS / cm to 25 mS / cm.

This invention provides a flavoring agent for enhancing the honey-sweet aroma of tobacco, comprising the following raw materials and their mass percentages: 0.2-0.3% 2,3-pentanedione, 0.45-0.55% phenylacetic acid, 0.45-0.55% phenethyl acetate, 0.25-0.4% phenylethanol, 0.45-0.6% methyl phenylacetate, 0.45-0.6% ethyl phenylacetate, 0.5-0.6% menthyl acetate, 0.15-0.25% geraniol, and the balance being propylene glycol. This invention belongs to the field of tobacco flavoring technology. By combining 2,3-pentanedione, phenylacetic acid, and phenethyl acetate in a specific mass ratio and conducting testing and evaluation, a flavoring agent suitable for enhancing the honey-sweet aroma of tobacco has been successfully developed. The composition is clearly defined, significantly improving the honey-sweet aroma of tobacco products, with a rich and long-lasting aroma, and good taste harmony.

The invention discloses a dual stimulus-responsive supramolecular gel temporary plugging agent and a preparation method thereof, and relates to the technical field of oil-gas field development. The supramolecular gel temporary plugging agent comprises the following components in percentage by mass: 5wt%-10wt% of a tertiary amine surfactant; the temperature response authigenic acid accounts for 0.2 wt%-2wt%; and the balance of water. Wherein the tertiary amine surfactant is prepared by reacting fatty acid and N, N-dimethyl-1, 3-diaminopropane according to the molar ratio of 1: 1, and the temperature response authigenic acid is composed of methyl formate, ethyl formate, methyl acetate, ethyl acetate and the like; the dual-stimulus-responsive supramolecular gel temporary plugging agent disclosed by the invention has the plugging strength of 4.3 MPa, takes water as a solvent, and is simple in process, high in yield, strong in environmental protection property, stable in performance and low in cost.

The utility model discloses a front mixing device of dimethyl ether and CO for methyl acetate processing, and belongs to the field of mixing tanks. The problems that the mixing efficiency of materials is low, and bottom liquid materials are difficult to fully contact and mix with gas materials are solved. The top of the fixed tank is fixedly provided with a liquid inlet pipe, the bottom of the fixed tank is fixedly provided with a liquid outlet pipe, the fixed tank is fixedly provided with a plurality of air inlet pipes, the air inlet pipes are fixedly provided with a plurality of nozzles, and the fixed tank is internally and fixedly provided with a mixing assembly; liquid materials are dispersed through the dispersing plate, dispersed liquid collides with CO gas, the contact area of the liquid materials and the CO gas is effectively increased, the mixing efficiency of gas materials and the liquid materials is effectively improved, a solution at the bottom of the fixed tank is sprayed through the shell and the transverse pipe, and the mixing efficiency of the gas materials and the liquid materials is improved. The gas material and the liquid material are further mixed, and meanwhile, the liquid material and the gas material at the bottom of the fixed tank are fully contacted and mixed.

A process for producing and recovering acetic acid in an acetic acid production system is disclosed, the process comprising contacting methanol, methyl acetate, or a mixture of the two, and carbon monoxide in the presence of a reaction mixture comprising iodide under carbonylation conditions sufficient to form acetic acid. The reaction mixture comprises a carbonylation catalyst, water, and one or more promoters selected from the group consisting of Group I and Group II aminopoly carboxylate salts and mixtures thereof. An aspect of the process includes a method for reducing water in the acetic acid production process.