49 results about "Ethyl propionate" patented technology

The invention provides an electrolyte, an electrochemical device and an electronic device, and belongs to the technical field of energy storage. Based on the mass of the electrolyte, the electrolyte comprises ethylene carbonate with the mass content of A%, methyl propyl carbonate with the mass content of B%, diethyl carbonate with the mass content of C%, ethyl propionate with the mass content of D% and propyl propionate with the mass content of E%; wherein 5 < = A < = 20, 10 < = B < = 20, and 0.1 < = A / (B + C + D + E) < = 0.5. By controlling the components and the mass content of the electrolyte, the components are matched with one another, so that the high-temperature cycle capacity retention ratio of the battery can be improved, the increase of the thickness of the battery in a high-temperature and high-humidity storage environment is controlled, the service life of the battery is prolonged, and the use safety of the battery is improved.

The invention discloses a production and processing device of ethyl dicyanopropionate and a processing method thereof, relates to the technical field of chemical production, and aims to solve the technical problem that a traditional stirring method cannot realize overall uniform mixing of mixed liquid according to density and viscosity, and the production and processing device comprises a tank body, a stirring mechanism, a turnover assembly and a defoaming unit. According to the stirring mechanism, the rubber rod is bent under the action of centrifugal force, the stirring area is enlarged, the mixing efficiency above the stirring cavity is improved, and different working conditions are adapted; the overturning assembly pushes the middle mixed liquid to uprush by utilizing a rubber barrel which is pressed to be concave inwards, so that segmented stirring is realized, and the mixing effect is enhanced by vibration force generated by contact between a rubber rod and a concave part; the defoaming unit enables foams to flow into a bearing ring to be defoamed by means of centrifugal force of mixed liquid, and a fixing cylinder, a spring and an extrusion block guarantee defoaming stability; the whole device is compact in structure, components are coordinated, operation is easy and convenient, and the standard processing method assists in improving the production quality and efficiency of ethyl dicyanopropionate.

The application provides a flavor composition for electronic cigarettes, electronic cigarette liquid and a preparation method thereof. The flavor composition for electronic cigarettes comprises 0.1-0.4 parts of ethyl isovalerate, 2.0-5.0 parts of isoamyl acetate, 0.1-0.6 parts of ethyl butyrate, 0.4-1.6 parts of ethyl acetate, 0.1-0.6 parts of propyl acetate, 0.1-0.6 parts of myric aldehyde, 0.05-0.3 parts of malic acid liquid and 0.02-0.1 parts of acetic acid liquid. By adjusting the ratio of the flavor composition, the application makes the flavor composition have strawberry flavor, can restore the pure fruit pulp aroma of strawberries, has high restoration degree of strawberry flavor, long aftertaste and good stability after high-temperature and high-humidity baking, and can be applied to electronic cigarette liquid, thereby improving the experience of users using electronic cigarettes.

The invention relates to the technical field of microorganisms, in particular to bacillus velezensis utilizing lactic acid and application of the bacillus velezensis in white spirit production. The lactic acid utilization strain obtained through screening has good tolerance, can be applied to Baijiu brewing, can significantly reduce the lactic acid content in the seventh-round fermented grains of Maotai-flavor by about 44.9%, improves the propionic acid and ethyl propionate in Baijiu by about 10.3%, improves the ethyl propionate by about 23.7%, and is stable in effect.

Proposed are preparations comprising (i) a mixture of substances comprising (a) one, two or more compounds selected from the group consisting of (a1) alcohol monoterpenes of the formula (I) where R1 is H or methyl, R2 is H or C2-alkenyl, and R3 is a linear or branched, saturated or unsaturated hydrocarbon radical having 4 to 10 carbon atoms, and their enantiomers, diastereomers, racemates, solvates and physiologically acceptable salts, and / or (a2) bicyclic epoxy monoterpenes, (b) at least two lactones of the formula (II) where R4 is H or methyl, R5 is a linear or branched, saturated or unsaturated hydrocarbon radical having 2 to 10 carbon atoms and n is the number 1 or 2, and their enantiomers, diastereomers and racemates, and (c) one, two or more Solvent selected from the group consisting of ethanol, water, dipropylene glycol (DPG), diethyl phthalate (DEP), propylene glycol (PG),Isopropyl myristate (IPM), isopropyl palmitate (IPP), triethyl citrate (TEC), triacetin (TRI), 1,2-propanediol, 1,3-propanediol, propanetriol, pentanediol, hexanediol, octanediol, decanediol, dodecanol, 4-hydroxyacetophenone, butylene glycol, pentylene glycol, hexylene glycol, decylene glycol, propylene carbonate, butylene carbonate, glycerol carbonate, 2-benzylheptanol, trimethyl hydroxypentyl isobutyrate, glyceryl caprylate, ethylhexylglycerin, benzyl benzoate (BB), and optionally (d) further flavorings or fragrances selected from the group consisting of 3-phenylbutanal, acetylmethylcarbinol, anethole, anisyl acetate, dihydroeugenol, linalyl formate, 2-methyldecanal, 2-Benzyl-2-methylbut-3-ene nitrile, 3-hexenyl acetate, styralyl acetate, citronellal, cinnamyl acetate, rhubafuran, betalonone, anther, prenyl acetate, 2-phenylpropanal, 4-(4-hydroxyphenyl)butan-2-one, ethylphenoxyacetate, isoraldein, gamma-terpinene, Limonene, Neocyclocitral, Methyl Lavender Ketone, Styralyl Propionate, Phenyl Ethyl Propionate, Limonenal,4-Isopentylcyclohexanol, 4-methyl-2-phenyl-3,6-dihydro-2H-pyran / 4-methylene-2-phenyl-tetrahydropyran, hydrocitronitrile, phenoxanol, isoamylphenyl acetate, damascone, silvial, nectaryl, ambroxide, acetylpyrazine, trimethylpyrazine, isoamyl acetate, cresyl methyl ether para, filbertone, cyclohexyl acetate, heliotropin, acetophenone, anisaldehyde, methylacetophenone para, veratraldehyde, methyl anisate and vertoprenal, and (ii) aldehydes of the formula (III) where R6 is a saturated or unsaturated, linear hydrocarbon radical, and / or (iii) free fatty acids of the formula (IV) where R7 is a linear or branched, saturated hydrocarbon radical.

The invention provides a secondary battery and electronic equipment, the secondary battery comprises a negative electrode plate and an electrolyte, the negative electrode plate comprises a negative electrode active material layer, the negative electrode active material layer comprises graphite and a silicon carbon material, the average sphericity of the silicon carbon material is m, and the range of m is 0.81-0.95; the electrolyte comprises ethylene carbonate, propylene carbonate, ethyl propionate and propyl propionate, based on the mass of the electrolyte, the mass percentage content of the ethylene carbonate is a%, the mass percentage content of the propylene carbonate is b%, the mass percentage content of the ethyl propionate is c%, the mass percentage content of the propyl propionate is d%, b ranges from 5 to 26, (a + b) / (c + d) ranges from 0.23 to 1.51, and the sum of the mass percentage content of the ethylene carbonate, the mass percentage content of the propylene carbonate, the mass percentage content of the ethyl propionate and the mass percentage content of the propyl propionate is d%. The electrolyte further comprises lithium difluorophosphate, the mass percentage content of the lithium difluorophosphate is n% based on the mass of the electrolyte, and m / n ranges from 3 to 14.5. According to the invention, the discharge performance and the safety performance of the secondary battery at low temperature can be improved.

The application belongs to the technical field of electrochemistry and relates to a secondary battery and an electronic device comprising the secondary battery. The secondary battery comprises a positive electrode, a negative electrode, a separator and an electrolyte; the negative electrode active material of the negative electrode comprises a silicon-carbon material; the electrolyte comprises ethyl propionate and propyl propionate, the mass percentage content of the ethyl propionate is a% and the mass percentage content of the propyl propionate is b% based on the total mass of the electrolyte, wherein 1.7<=a / b<=5.7; the electrolyte further comprises at least one of vinylene carbonate, a boron-containing lithium salt and a compound comprising a structure shown in Formula I; wherein A in Formula I is selected from C2 to C5 alkylene. The secondary battery, by improving the used electrolyte system, reduces the gas generated by the secondary battery containing the electrolyte system at high temperature, and further improves the high-rate discharge performance of the secondary battery.

The invention relates to the technical field of batteries, in particular to an electrolyte without ethylene carbonate and a battery. The electrolyte comprises fluoroethylene carbonate, diethyl carbonate, propylene carbonate and a compound A, and the compound A is at least one of ethyl propionate and propyl propionate; based on the total mass of the electrolyte, the mass content w1 of the fluoroethylene carbonate is 10-30%; the mass content w5 of the diethyl carbonate is 5%-25%; the content w6 of the propylene carbonate is 5%-28%; the mass content of the compound A is w2, and w2 is 25%-60%; under the condition that the compound A is a combination of ethyl propionate and propyl propionate, the mass content of ethyl propionate is greater than that of propyl propionate; and 1.04 < = w1 / w5 < = 3.5. Comprising the electrolyte provided by the invention is improved in high-temperature stability, dynamic performance and cycle performance.

The utility model relates to the technical field of reaction kettle discloses a reaction kettle of production ethyl propionate, including kettle body, the kettle body top is provided with the kettle cover, the kettle cover inside fixedly connected with the feed pipe, the kettle cover top is provided with the motor, the motor output fixedly connected with the pivot, the pivot side wall is provided with the adjusting mechanism, the pivot outside is provided with the stirring vane, the kettle cover inside fixedly connected with the exhaust pipe, the exhaust pipe top is provided with quick -release mechanism, the adjusting mechanism includes the fixed peg and the recessed hole of opening in the pivot inside, the fixed peg side wall sliding connection is in the recessed hole inside. In the utility model, by pulling the fixed peg, makes the slip ring to drive the stirring vane and moves up and down along the pivot's axial direction, can according to the height of liquid level or the increase of material viscosity in the reaction process, the immersion depth and the action area of stirring vane are adjusted flexibly, not only has optimized the mass transfer heat transfer efficiency, also avoided the problem of local overheating and reaction uneven.

The invention provides a low-energy-consumption production process for esterification synthesis of ethyl propionate. According to the method, propionic acid is added from the middle part or the lower part of an esterification tower, and an ethyl propionate-water-ethanol ternary azeotropic system is broken through the strong association effect of propionic acid and water; in addition, sulfuric acid and propionic acid are fixed at the bottom of the esterification tower and the middle lower part of the esterification tower under the strong complexing action of the acid-binding agent, so that side reaction caused by entrainment of the sulfuric acid and the propionic acid on the upper part of the esterification tower can be reduced; reflux of ethyl propionate at the top of the tower can be effectively reduced by reducing concentration of sulfuric acid and propionic acid at the middle or upper part of the esterification tower, and energy consumption is reduced.

The invention discloses application of a compound to prevention and control of plant pathogenic fungus fusarium oxysporum, and belongs to the technical field of agricultural disease prevention and control. The compound is 3-[1-(1H-benzimidazole-2-yl)-5-hydroxy-3-methyl-1H-pyrazole-4-yl] ethyl propionate. According to the invention, it is found for the first time that the 3-[1-(1H-benzimidazole-2-yl)-5-hydroxy-3-methyl-1H-pyrazole-4-yl] ethyl propionate has a relatively strong inhibition effect on plant pathogenic fungus fusarium oxysporum; experiments show that the compound has a median inhibitory concentration IC50 of 25.2 [mu] g / mL on fusarium oxysporum, and compared with other bactericides, the compound has the advantages of high efficiency, low toxicity and low residue, has better environmental compatibility, and meets the requirements of green plant protection and sustainable agricultural production and the needs of development.

The present invention relates to an electrolyte composition comprising at least a sodium salt dissolved in at least one solvent and a combination of additives, wherein: the solvent is selected from the group consisting of ethylene glycol carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, propylene carbonate, ethyl acetate, ethyl propionate, methyl propionate, 4-fluorotoluene, 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether, difluoroethylene glycol carbonate, ethyl difluoroacetate and mixtures thereof; and the combination of additives comprises at least sodium difluoro(oxalato)borate (NaODFB) and tris(trimethylsilyl)phosphite (TMSPi).

The application discloses a local high-concentration lithium metal battery electrolyte and a preparation method and application thereof. The electrolyte comprises a lithium salt, an organic solvent, an additive and a diluent; the organic solvent comprises at least one of methyl formate, methyl acetate, methyl propionate, methyl butyrate, ethyl propionate, ethyl acetate, ethyl butyrate, methyl trifluoroacetate and ethyl trifluoroacetate; the additive comprises at least one of fluoroethylene carbonate, lithium difluorobisoxalate phosphate and lithium difluorophosphate; and the diluent is a fluorine-containing ether compound. The local high-concentration electrolyte has the advantages of high-voltage resistance of high-concentration electrolyte and inhibition of corrosion of sulfonimide-based electrolyte on aluminum foil, meanwhile, the problems of high viscosity, low conductivity and poor impregnation with a separator of high-concentration electrolyte are overcome, the cycle performance and low-temperature performance of the lithium metal battery are significantly improved, and the local high-concentration electrolyte is particularly suitable for application in a low-temperature high-voltage lithium battery. The preparation method is simple, the cost is low, and the method is suitable for industrial production.

Disclosed in the present application are an electrolyte, a secondary battery and an electronic apparatus. The electrolyte comprises ethylene sulfate and vinylene carbonate, wherein on the basis of the mass of the electrolyte, the mass percentage content of the ethylene sulfate is A% and the mass percentage content of the vinylene carbonate is B%, 0.1≤A / B≤4; the electrolyte at least comprises ethyl propionate and propylene carbonate; the electrolyte further comprises a first substance, wherein the first substance is at least two selected from lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(trifluoromethanesulfonyl)imide or lithium hexafluorophosphate, and at least contains lithium difluorophosphate, and on the basis of the total mass of the electrolyte, the mass percentage content of the first substance is 0.3 wt%-1.2 wt%. In the process of charge and discharge of the secondary battery of the present application, the low-temperature cycle performance and the overcharge prevention capacity under a large current condition of the secondary battery and an electrochemical apparatus can be improved.

The invention belongs to the technical field of fermentation engineering, and particularly relates to Wickerhamomyces anomalus JG-WA1 and application thereof in aroma-enhancing fruit wine. A strain of aroma-enhanced Wickerhamomyces anomalus JG-WA1 is screened from distiller's yeast, apple juice is inoculated with the strain for primary fermentation, then saccharomyces cerevisiae is inoculated for secondary fermentation, and the aroma-enhanced fruit wine is prepared. The content of unpleasant odor substances such as acetone, 4-methyl-1-pentanol, 2-butanol, dimethyl disulfide, 3-hexanone and the like with pungent smell of alcohol or mildew odor and the like in the fruit wine is obviously reduced, while the content of 2-pentanol, ethyl propionate, propyl acetate, 3-methyl-2-pentanone, 3-pentene-2-ketone, hexyl hexanoate, ethyl hexanoate, methyl acetate, heptanal, 2-octanone, 2, 3-pentanone, ethyl hexanoate, ethyl hexanoate, methyl acetate, heptanal, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate, ethyl hexanoate and ethyl hexanoate is obviously reduced. The content of fruit flavor components such as 2, 3-dimethylpyrazine is greatly increased, the brewed apple wine is obvious in ester flavor and transparent and bright in color, and the flavor quality is obviously improved.

A secondary battery, including a negative electrode plate and an electrolyte, where the negative electrode plate includes a negative electrode active material layer. The negative electrode active material layer includes graphite and a silicon-carbon material, and an average sphericity of the silicon-carbon material is 0.81 to 0.95. The electrolyte includes ethylene carbonate, propylene carbonate, ethyl propionate and propyl propionate, where based on a mass of the electrolyte, a mass percentage of the ethylene carbonate is a %, a mass percentage of the propylene carbonate is b %, a mass percentage of the ethyl propionate is c %, a mass percentage of the propyl propionate is d %, and (a+b) / (c+d) is in a range of 0.23 to 1.51.

This invention provides a method for preparing small-particle-size sulfide solid electrolytes and their applications. Under an inert atmosphere, a sulfide solid electrolyte precursor is mixed with a first solvent and reacted. The first solvent is selected from at least one of ethylenediamine, N,N-dimethylacetamide, and 1,2-ethylenedithiol. The mixture is then further mixed with a second solvent, and stirred to precipitate the sulfide solid electrolyte. The second solvent is selected from at least one of n-hexane, n-heptane, ethyl acetate, ethyl propionate, and N,N-dimethylacetamide. Solvent separation, drying, and heat treatment are then performed. This method synthesizes the sulfide solid electrolyte in the first solvent, which is then directly transferred to the second solvent, allowing the sulfide solid electrolyte to precipitate. Direct solvent separation eliminates the crystallization process, significantly reducing time and costs. The method is simple and efficient, resulting in high purity and high ionic conductivity. The resulting battery exhibits high discharge capacity, excellent cycle performance, rate capability, and limiting current density.

The application discloses a continuous closed-loop cyclic production process for preparing propionic acid ester by taking methanol or dimethyl ether as raw material, and belongs to the technical field of organic synthesis chemical industry. The process comprises the following steps: S1, methyl acetate is hydrogenated to generate mixed alcohol of methanol and ethanol; S2, mixed alcohol is etherified with methanol to generate mixed ether comprising dimethyl ether, diethyl ether and methyl ethyl ether; S3, mixed ether is carbonylated with dimethyl ether and carbon monoxide to generate mixed ester comprising methyl acetate, ethyl acetate, methyl propionate and ethyl propionate; S4, ethyl acetate, methyl propionate and ethyl propionate products are obtained through rectification separation in a plurality of towers in series connection, and methyl acetate is recovered; and S5, the recovered methyl acetate is recycled back to the step S1. By constructing a methyl acetate directional closed-loop cyclic system, the application realizes efficient co-production of propionic acid ester and ethyl acetate, uses solid catalysts in the whole process, avoids strong acid corrosion, has high raw material utilization rate, has mild reaction conditions, can be continuously produced in industry, and effectively solves the problems of high cost, single product and non-recyclable utilization in the prior art.

The invention relates to the field of sodium-ion batteries, in particular to a wide-temperature-range sodium-ion battery electrolyte suitable for a hard carbon negative electrode and a preparation method and application of the wide-temperature-range sodium-ion battery electrolyte. The wide-temperature-range sodium-ion battery electrolyte suitable for the hard carbon negative electrode comprises sodium salt, an organic solvent and an additive, wherein the sodium salt is selected from sodium perchlorate; the organic solvent is composed of a solvent A and a solvent B, the solvent A is selected from propylene carbonate, and the solvent B is selected from ethyl propionate; the additive is selected from fluoroethylene carbonate. The sodium ion solvation structure is regulated and controlled by regulating and controlling the salt concentration, the cosolvent proportion and the additive proportion, then an interface passivation layer is precisely regulated and controlled, electrochemical decomposition is inhibited, interface impedance is reduced, the wide-temperature-range cosolvent electrolyte is developed, stable and reversible charging and discharging of a sodium ion battery at the temperature of 50 DEG C below zero to 70 DEG C are achieved, and the application scene of the battery is widened.

An electrochemical device includes an electrode assembly and an electrolyte. The electrode assembly includes a negative electrode plate including a negative electrode active material layer. The negative electrode active material layer includes a negative electrode active material; and a negative electrode binder including an ester substance and a non-ester substance. Based on a mass of the negative electrode binder, a mass percentage of the ester substance is x; the electrolyte includes fluoroethylene carbonate and a high-kinetic solvent, the high-kinetic solvent includes at least one of ethyl propionate, propyl propionate, or diethyl carbonate. A ratio of a mass percentage of fluoroethylene carbonate to a mass percentage of the high-kinetic solvent in the electrolyte is y; and 17%≤x+y≤53%, y is from 0.4% to 14%. Based on a mass of the electrolyte, a mass percentage of fluoroethylene carbonate is from 0.1% to 10%.

The application relates to the technical field of edible essence. The application discloses a yogurt essence and a preparation method thereof. The raw material composition of the yogurt essence comprises ethyl maltol, vanillin, butanedione, acetic acid, ethyl acetate, propionic acid, 2,3-pentanedione, 3-hydroxy-2-butanone, butyric acid, ethyl butyrate, isoamyl acetate, methyl thio butyrate, hexanoic acid, ethyl hexanoate, 10% furanone, isoamyl butyrate, ethyl levulinate, linalool, p-cymene, 4-terpinenol, nerol, citral, geraniol, neryl acetate, geranyl acetate, D-limonene, lemon oil, distilled white lemon oil, sweet orange oil, glycerol triacetate, rosemary extract and bitter gourd extract. The yogurt essence prepared by the application has a flavor closer to real yogurt, good thermal stability and good flavor persistence.

This invention provides a lithium-ion secondary battery containing allyl succinic anhydride as an electrolyte additive, which exhibits excellent initial charge efficiency and output characteristics. [Solution] The lithium-ion secondary battery comprises a positive electrode containing a positive electrode active material capable of intercepting and releasing lithium ions, a negative electrode containing a negative electrode active material capable of intercepting and releasing lithium ions, a separator disposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte containing a lithium salt, a non-aqueous solvent, and an electrolyte additive. The negative electrode active material contains natural graphite and artificial graphite, the non-aqueous solvent contains ethylene carbonate, diethyl carbonate, ethyl propionate, and propyl propionate, and the electrolyte additive contains allyl succinic anhydride and dinitrile, with the electrolyte additive containing dinitrile in a proportion of 1.5% by mass or more and 3.2% by mass or less.

The invention discloses a sodium metal battery electrolyte used under high voltage and a preparation method and application thereof, and belongs to the technical field of sodium metal batteries. The sodium metal battery electrolyte comprises sodium salt, cyclic carbonate, chain carbonate and fluorocarboxylate, wherein the concentration of the sodium salt is 0.5-1.5 mol / L, and the mass ratio of the cyclic carbonate to the chain carbonate to the fluoro carboxylic ester is (0.3-0.35): (0.4-0.55): (0.1-0.3); the sodium salt is one of sodium hexafluorophosphate and sodium bis (fluorosulfonyl) imide, the cyclic carbonate is fluoroethylene carbonate, the chain carbonate is ethyl methyl carbonate (EMC), and the fluorocarboxylic ester is one of ethyl 2, 2-trifluoroacetate, methyl 3, 3, 3-trifluoropropionate, ethyl 3, 3, 3-trifluoropropionate, methyl 4, 4, 4-trifluorobutyrate, ethyl 4, 4, 4-trifluorobutyrate and methyl perfluorobutyrate. Through the combined design of fluoroethylene carbonate (FEC), chain carbonate and fluorocarboxylate, an advanced electrolyte system is constructed together, and the electrolyte has excellent performance of high rate performance and long-term cycle stability at the same time under high voltage.

The invention belongs to the technical field of essence, and particularly relates to essence with strawberry flavor as well as a preparation method and application thereof. Comprising one or more of a strawberry hot reflux extract, a strawberry supercritical CO2 extract, 200 nm, 50 nm, 10 nm, 5 nm and 2 nm membrane interception liquid or 2 nm membrane permeation liquid of strawberries, and strawberry molecular distillation light components. The plant essential oil further comprises one or more of furanone, leaf alcohol, ethyl acetate, ethyl propionate, peach aldehyde, vanillin, vanilla planifolia extract, ethanol, cinnamyl alcohol, citric acid and Peru balsam. The obtained strawberry-flavored essence has the function of restoring the natural fragrance of strawberries from different dimensions.

The utility model relates to the technical field of ethyl dicyanopropionate production, in particular to a chemical raw material mixture purifying device which comprises a heating reaction kettle, the bottom end of the heating reaction kettle is fixedly connected with a filtering and purifying mechanism, and the filtering and purifying mechanism comprises a filtering seat fixedly connected to the bottom end of the heating reaction kettle. A collecting seat is fixedly connected to the bottom end of the filtering seat, a heightening plate is fixedly connected to the inner side wall of the filtering seat, a filtering column is rotationally connected into the heightening plate, and a transmission motor is fixedly connected to the top wall of the collecting seat. According to the utility model, the heating reaction kettle is matched with the filtering and purifying mechanism, the shape of a heightening plate is utilized to ensure that an intermediate material is filtered by a filtering column and a filtered finished product enters a collecting seat, a transmission motor is started to drive a transmission gear to rotate, and the transmission gear is utilized to drive a driven gear and the filtering column to rotate; solid salt on the surface of the filtering column is scraped off by the scraping plate and is accumulated on one side of the scraping plate.

The present invention provides a kind of (1R, 2R) 2-amino-1-(4-nitrophenyl) 1,3-propylene glycol preparation process, the substrate of the reduction process is (2S, 3R) 2-amino-3-hydroxy-3-(4-nitrobenzene) propionic acid, after esterification reaction, (1R, 2R) 2-amino-1-(4-nitrophenyl) 1,3-propylene glycol is obtained through reduction reaction under sodium borohydride-Lewis acid conditions. The preparation process obtains the final product by a two-step method, and the first step esterification reaction optimizes the reagents in the reaction process and controls the addition amount so that the molar yield of the final product (2S, 3R) 2-amino-3-hydroxy-3-(4-nitrobenzene) ethyl propionate of the esterification reaction can reach 98%, thereby avoiding the generation of by-product methyl ester, and the second step reduction reaction improves the molar yield of refined left alcohol by adding Lewis acid, which is suitable for industrial production.

The invention provides an electrochemical device and an electronic device, the electrochemical device comprises an electrolyte, and the electrolyte comprises ethylene carbonate, propylene carbonate, ethyl propionate and propyl propionate; based on the total mass of ethylene carbonate, propylene carbonate, ethyl propionate and propyl propionate, the mass contents of ethylene carbonate, propylene carbonate, ethyl propionate and propyl propionate are respectively A%, B%, C% and D%, B is more than or equal to 5 and less than or equal to 20, and A / B is more than or equal to 1.5 and less than or equal to 2.5; 40 < = D < = 60; 2 < = D / C < = 4. According to the electrochemical device, all the components of the electrolyte have a synergistic effect, and the cyclic expansion rate of the electrochemical device in shelf storage can be inhibited.

To provide a secondary battery with improved collision characteristics and a battery pack containing the same. To provide a secondary battery with improved adhesion between the separator membrane and the electrode plate and a battery pack containing the same. [Solution] The secondary battery includes a case having an opening; an electrode assembly and electrolyte housed in the case; and a cap-up positioned in the opening. The electrode assembly includes a first electrode plate, a second electrode plate, and a separation membrane located between the first and second electrode plates. The separation membrane includes a substrate and a coating layer located on at least one surface of the substrate. The substrate has a sum of elongation in the mechanical and transverse directions of 200% or less and a sum of tensile strength in the mechanical and transverse directions of 4000 kgf / cm². 2 The following applies: the coating layer includes a binder, the binder includes one or more of aramid resins and acrylic resins, and the electrolyte contains 20% by volume or more of ethyl propionate or ethylene carbonate.

The utility model relates to the technical field of reaction kettle, disclose a reaction kettle with good reaction effect for producing ethyl propionate, including kettle body, the kettle body top is fixedly connected with the feeding cylinder, the kettle body bottom is fixedly connected with the discharge cylinder, the kettle body side wall is fixedly connected with the support frame, the kettle body inside is provided with stirring subassembly, the kettle body top is provided with the crushing subassembly, the stirring subassembly includes propeller and anchor type paddle, the kettle body inside is fixedly connected with the inner bag, the kettle body top is fixedly connected with motor no.

An electrolyte solution includes an organic solvent, and the organic solvent includes ethyl propionate and propyl propionate. Based on a mass of the electrolyte solution, a mass percentage of the ethyl propionate is m %, and a mass percentage of the propyl propionate is n %, a difference n−m between n and m being 5 to 54. The negative electrode active material includes graphite, a ratio n / Lc of n to a crystal size value Lc of the graphite being 1 to 2.14. The amount difference between the ethyl propionate and the propyl propionate in the electrolyte solution is set to satisfy specific requirements, and the ratio n / Lc of the mass percentage n % of the propyl propionate to the crystal size value Lc of the graphite is 1 to 2.14, reducing the high-temperature internal resistance of the secondary battery, and improving the high-voltage cycling performance.