558 results about "Diethyl ester" patented technology

The invention relates to a non-aqueous electrolyte for high-voltage lithium ion batteries, which is prepared from the following raw materials in percentage by weight: 70-85% of carbonate, 3-20% of functional additive and 11-17% of lithium hexafluorophosphate. The carbonate is one or mixture of more of ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methylethyl carbonate, methyl propyl carbonate and methyl butyl carbonate; and the functional additive is one or mixture of more of 0.5-10% of negative pole film-forming additive, 0.5-10% of high-temperature additive, 0.5-10% of positive pole film-forming additive, 0.5-10% of high-voltage additive and 0.001-2% of stability additive. The invention solves the problem of adaptation of the lithium ion battery electrolyte to the 4.35V high-voltage battery positive/negative pole, and provides an electrolyte for high-voltage batteries, which has the advantages of high cycle life, low inflation rate and favorable high-temperature properties.

A rechargeable lithium cell comprising a cathode, an anode, a non-flammable quasi-solid electrolyte containing a lithium salt dissolved in a mixture of a liquid solvent and a liquid additive having a salt concentration from 1.5 M to 5.0 M so that said electrolyte exhibits a vapor pressure less than 0.01 kPa, a vapor pressure less than 60% of the vapor pressure of the liquid solvent alone, a flash point at least 20 degrees Celsius higher than the flash point of the liquid solvent alone, a flash point higher than 150° C., or no flash point, wherein the liquid additive is selected from Hydrofluoro ether (HFE), Trifluoro propylene carbonate (FPC), Methyl nonafluorobutyl ether (MFE), Fluoroethylene carbonate (FEC), Tris(trimethylsilyl)phosphite (TTSPi), Triallyl phosphate (TAP), Ethylene sulfate (DTD), 1,3-propane sultone (PS), Propene sultone (PES), Diethyl carbonate (DEC), Alkylsiloxane (Si—O), Alkylsilane (Si—C), liquid oligomeric silaxane (—Si—O—Si—), Tetraethylene glycol dimethylether (TEGDME), or a combination thereof.

The invention relates a side chain-containing aliphatic diol modified copolyester section and a preparation method thereof; the section is copolymerized by terephthalic acid, ethanediol, m-benzene dicarboxylic acid diethyl ester-5-sodium sulfonate or potassium sulfonate and side chain-containing aliphatic diol and is synthesized in a semicontinuous polymerzation device. The copolyester section of the invention can be dyed to dark color with cationic dye at room temperature and normal pressure; the crystallization property and the glass state temperature of the copolyester are reduced so that the prepared fibre has extremely soft hand feeling; the manufacturing process has no special demand on devices and the cost is low so that the preparation method is applicable to industrialized production.

The invention discloses non-aqueous electrolyte for a lithium manganate power battery. The non-aqueous electrolyte comprises 70-90% of carbonic ester compound, 3-20% of various functional additives and 11-17% of lithium hexafluorophate, wherein the carbonic ester compound is one of or mixture of ethylene carbonate (EC), propylene carbonate (PC), butane carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl ethyl carbonate (EMC), methyl propyl carbonate (MPC) and methyl butyl carbonate (BMC); and the additives comprise 0.5-10% of a film forming additive, 0.5-10% of a high-temperature additive, 0.5-10% of an anti-overcharge additive, 0.5-10% of a flame retardant additive and 0.001-2% of a stability additive. In the non-aqueous electrolyte for the lithium manganate power battery of the invention, the performance of a solid phase interfacial film in the battery is improved, the compatibility of the electrolyte with negative electrode material is enhanced, and the cycle performance as well as the safety performance of the battery is greatly improved.

The invention belongs to the field of lithium batteries, in particular to a low-temperature lithium ion battery. The positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer comprises 4.4 V lithium cobaltate material, a positive electrode conductive agent and a positive electrode binder. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer comprises a hard carbon coatedsecondary particle artificial graphite material, a negative electrode conductive agent, a dispersant and a negative electrode binder. The electrolyte comprises 10-20% of lithium hexafluorophosphate,10-20% of ethyl propionate, 10-20% of diethyl carbonate, 15-30% of vinyl carbonate, 15-30% of propyl propionate, 3-10% of fluorovinyl carbonate, 2-3% of propylene sulfite, 0.5-2.5% of ethylene glycolmonobutyl ether and 0.5-2.5% of 2, 2'-dithiopyridine. Compared with the batteries in the prior art, the lithium ion battery has good charging and discharging performance and higher energy density under low temperature condition.

The invention discloses a flame-proof electrolyte and its lithium battery for secondary lithium battery, which is characterized by the following: adopting one or more phosphosubester (such as methyl acid phosphate dimethyl ester, ethyl phosphate diethyl ester and its derivant) as pure solvent or solvent component; reducing the price of electrolyte with incombustibility, low toxicity and high conductivity; improving the combusting safety effectively.

The invention discloses a base agent-free single-component wet solidifying polyurethane binder, which is reacted by the following parts: polyurethane prepolymer, binding accelerant, 2,2-dimorphia diethyl ester and tin dibutyl dilaurate catalyst, elasticizer, fill, ultraviolet absorbent and stabilizer, wherein the single-component polyurethane binder possesses excellent binding property for binding and assembling automobile and other vehicle.

A non-aqueous electrolyte of the present invention contains a lithium salt (A), a quaternary ammonium salt (B) containing a straight chain alkyl group having carbon atoms of 4 or less and a solvent (C) composed of at least one compound selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate, γ-butyrolactone, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, dimethoxyethane, ethoxymethoxyethane and diethoxyethane. The molar ratio C/A of the solvent (C) to the lithium salt (A) or the molar ratio C/B of the solvent (C) to the ammonium salt (B) is 6 or less. The non-aqueous electrolyte has a single phase. Consequently, there can be obtained a non-aqueous electrolyte of a high ion concentration having an excellent oxidation resistance and reduction resistance.

The invention relates to the technical field of cable materials, in particular to a modified high-flame-retardation weather-resistant polyurethane cable material and a preparing method thereof. The modified high-flame-retardation weather-resistant polyurethane cable material comprises modified polyurethane elastomer, ethylene-vinyl ethylene copolymer, nitrile rubber, chlorinated polyethylene, antimony trioxide, calcium chloride, ethyl phosphoric acid diethyl ester, a lubricating agent, a dispersing agent, an antioxidant, a rat-proof master batch, a termite-proof master batch and an ultraviolet light absorber. The modified polyurethane elastomer is formed by anionic polyurethane of lateral chain band sulfonic group or/and carboxylic group, tetra-n-butyl titanate, organic solvent, deionized water and a catalyst. According to the preparing method of the modified high-flame-retardation weather-resistant polyurethane cable material, as the modified polyurethane elastomer is used as the main raw material, the modified polyurethane cable material prepared by the method has high flame retardation and weather resistance.

The invention discloses a method for synthesizing esomeprazole sodium. The method comprises the steps as follows: preparing 5-methoxy-2-(4-methoxy-3,5-dimethyl-2-pyridyl) methylthio-1H-benzimidazole, namely prochirality thioether; preparing crude esomeprazole sodium; refining the crude esomeprazole sodium; adding the prepared prochirality thioether and dried methylbenzene into D-(-) diethyl tartrate and water by stirring, adding titanium isopropylate, and stirring; and adding diisopropylamine at constant temperature, stirring, dropwise adding cumyl hydroperoxide with the mass concentration of 80%, ending the reaction, extracting, salifying, concentrating, washing and carrying out vacuum drying to obtain a crude product, and refining the crude product to obtain the esomeprazole sodium. The method is low in cost, toxicity and pollution, easy to operate, short in reaction time, high in product purity and easy for industrial production.

The invention relates to a low-temperature electrolyte for LiFePO4 (lithium iron phosphate) lithium-ion batteries, belonging to the technical field of low-temperature electrolytes for lithium batteries. The electrolyte comprises dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, ethylene carbonate, a film-forming additive and lithium polyoxometallate, wherein the lithium polyoxometallate refers to lithium phosphomolybdate Li3PMo12O40, lithium phosphotungstate Li3PW12O40, lithium silicotungstate Li4SiW12O40 or lithium silicomolybdenate Li4SiMo12O40. For solving the problems that in the prior art, the lithium ion transport of an electrolyte is blocked, slow in speed and low in efficiency and the electrolyte is poor in low-temperature performance, the invention provides a novel fluoride-free low-temperature electrolyte for LiFePO4 lithium-ion batteries; and by taking the non-fluoride lithium polyoxometallate with a three-dimensional skeleton structure as an electrolytic lithium salt and selectively adopting a low-viscosity carbonate solvent, through optimized proportioning, the migration rate of lithium ions is increased, and the low temperature properties of LiFePO4 batteries can be significantly improved.

The invention provides a preparation method of diethyl N,N-bis(2- hydroxyethyl) aminomethylphosphonate, comprising the following steps: (1) carrying out depolymerization on paraformaldehyde; (2) carrying out ring formation on formaldehyde and diethanol amine to prepare 3-(2- hydroxyethyl)-1,3-oxazolidine; (3) reacting 3-(2- hydroxyethyl)-1,3-oxazolidine with diethyl phosphite in the presence of anhydrous Lewis acid catalysts; and (4) filtering and recovering the catalysts to obtain a yellow transparent liquid product. The overall yield of the whole process reaches more than 99 %, and the content of diethyl N,N-bis(2- hydroxyethyl) aminomethylphosphonate in the product is 94 %-96 %. The preparation method disclosed in the invention is simple and efficient, has the advantages of high product yield, high content of effective components in the product, reduction of temperature in dehydration process, shortening of time, and low energy consumption, reduces the water content of the final product to 0.1-0.2 %, and reduces the dosage of the catalysts by 20-50%. The preparation method is suitable for large-scale industrial production.

The invention belongs to the technical field of lithium ion batteries, particularly relates to electrolyte of the lithium ion batteries, and by weight, is composed of 13.5-18.5% of electrolyte, 66.5-78.5% of solvent and 8-15% of annexing agent. The solvent is composed of at least three of ethylene carbonate (EC), ethyl acetate (EA), propyl acetate (EP), dimethyl carbonate (DMC), methyl ethyl carbonate (EMC) and diethyl carbonate (DEC), the annexing agent is composed of at least three of vinylene carbonate (VC), 1,3 propane suhone (PS), difluoro oxalic acid lithium borate (LIODFB), propylene carbonate (PC), polyoxy diethyl ether and fluoro ethylene ester (FEC), and the electrolyte is lithium hexafluorophate (LiPF6). The electrolyte still has excellent performance at low temperature, and lithium ion batteries made of the electrolyte are excellent in low temperature discharge performance.

The invention provides a supported catalyst prepared by iodide, cupric salt, a Schiff alkali complex and a carrier as well as a preparation method and an application method thereof, aiming to overcome the disadvantages of low homogeneous phase catalyst activity and difficult separation recycle of the traditional carbonylation synthesis organic carbonate. The catalyst is prepared by preparing the carrier which is in grafting with the Schiff alkali complex in advance, and then preparing the supported catalyst with the copper content of 3-10wt% through reaction in alcoholic solution of the cupric salt and the iodide. The catalyst has the advantages of high catalysis efficiency, long service life, little corrosion, little catalyst loss, easy recovery and recycle of the catalyst and the like and has favorable industrial application prospect in the process of synthesizing methyl-carbonate, diethyl ester, dipropyl and glyceride.

The invention relates to a device and method for preparing cell grade methyl ethyl carbonate from dimethyl carbonate and ethanol. The device comprises a static mixer, a multi-grade pre-heater, a pre-reactor, a reactive distillation column, a reactive distillation column re-boiler, a diethyl carbonate removing tower, a first compressor, a diethyl carbonate removing tower re-boiler, a methyl ethyl carbonate rectifying tower, a second compressor, a methyl ethyl carbonate rectifying tower re-boiler, a first water cooler, and a second water cooler. The components mentioned above are connected to form the device. Steam collected from the top of the reactive distillation column and hot materials in the methyl ethyl carbonate rectifying tower supply heat to the reaction materials, and steam consumption is reduced. Only the re-boiler in a dimethyl carbonate rectifying tower consumes low pressure steam, and other towers do not consume low pressure steam. Moreover, the product meets the cell grade requirements, the quality is stable, no dangerous solid waste containing organic substances is generated; the raw material cost is low, the byproducts are few, and the energy is saved.

The invention provides a flame-resistant type polyurethane emulsion. The flame-resistant type polyurethane emulsion is prepared from the following raw materials in parts by mass: 100 parts by mass of polypropylene carbonate neopentyl glycol, 4-9 parts by mass of 2,2-dimethylol propionic acid, 25-56 parts by mass of diisocyanate, 0.1-0.5 part by mass of a catalyst, 11-17 parts by mass of N, N-bis(2-hydroxyethyl)aminomethyl phosphonic acid diethyl ester, 2-18 parts by mass of a salt-forming agent, 10-30 parts by mass of an organic solvent, 0.55-1 part by mass of a chain extender and 320-430 parts by mass of deionized water. According to the flame-resistant type polyurethane emulsion disclosed by the invention, phosphate ester is introduced in a molecule main chain, through compounding of phosphate ester and carbonic ether, few phosphate ester compounds are used, and a good flame resistant effect can be achieved. A carbon dioxide copolymer polyalcohol is used as a soft segment, and hydrolysis-resistant; and besides, the molecule of the carbon dioxide copolymer polyalcohol contains a large quantity of ester bonds and ether bonds, so that intramolecular and intermolecular hydrogen bonds can be formed, and the aqueous polyurethane emulsion having favorable physical properties can be obtained.

The invention discloses a preparation method of d-biotin. Existing d-biotins can be obtained from debenzylation reactions of bisbenzylbiotin, and can be obtained from debenzylation and decarboxylation reactions of bisbenzylbiotin diester. However, d-biotins obtained from the two methods are not ideal. The preparation method of d-biotin provided by the invention comprises the following steps that: (1) sulfonium halide is adopted as a raw material, and is condensed with 2,2-diethyl acetoacetate, such that bisbenzylbiotin diethyl ester is obtained; the bisbenzylbiotin diethyl ester is processed through debenzylation, hydrolysis, decarboxylation and loop opening reactions; (2) d-biotin which is not processed form the loop opening reaction is separated from the product obtained from the previous step; d-biotin-separated ring-opened object is cyclized with triphosgene, such that d-biotin is obtained. According to the invention, 2,2-diethyl acetoacetate is adopted as a raw material. Bisbenzylbiotin dimer is not generated from obtained bisbenzylbiotin diethyl ester. The reaction yield is high, and the yield of d-biotin is high.

The invention discloses a preparation method of 4-acetoxyl-2-methyl-2-butene-1-aldehyde and relates to the technical field of organic synthesis. The method comprises the steps of firstly reacting 1,4-butylene glycol serving as a raw material with an esterification reagent to prepare 1,4-butylene glycol diethyl ester; preparing 3,4-diacetoxy-1-butene through isomerization reaction; carrying out hydroformylation reaction on carbon monoxide and hydrogen to prepare 2-methyl-3,4-diacetoxy-1-butyraldehyde; and finally preparing the 4-acetoxyl-2-methyl-2-butene-1-aldehyde through elimination reaction. The method is simple in reaction operation, cheap and available in starting material, high in conversion rate and low in catalyst dosage, thereby effectively reducing the synthesis cost.

The invention discloses a method for preparing a mimic enzyme molecularly imprinted polymer microsphere for hydrolyzing organophosphorus. A paraoxon transient state analogue (4-nitro benzyl) phosphoric acid diethyl ester serves as a template molecule, 1-vinyl imidazole and methacrylic acid are functional monomers, a molecular imprinting technology is used, a precipitation polymerization method is adopted, and therefore the mimic enzyme molecularly imprinted polymer microsphere for hydrolyzing the organophosphorus is prepared, wherein the mimic enzyme molecularly imprinted polymer microsphere for hydrolyzing the organophosphorus is good in dispersibility and uniform in particle size. The paraoxon hydrolytic enzyme activity of the prepared molecularly imprinted polymer microsphere and the paraoxon spontaneous hydrolyzing are compared, the hydrolyzing efficiency can be improved by 188 times to the maximum and is also improved by 2.3 times compared with the catalyzing efficiency of a non-imprinted polymer synthesized under the condition of not adding template molecules, a measured Km value and a measured Vmax value are 0.064 mmol/L min and 2.41 mmol/L respectively, and Kcat is 0.237/S. The prepared mimic enzyme molecularly imprinted polymer microsphere for hydrolyzing the organophosphorus can be used for efficiently hydrolyzing organophosphorus pesticide and can also be used for degrading and destroying organophosphorus nervous toxic agent chemical weapons.

The invention relates to a synthesis method for 5-aminolevulinic acid hydrochloride. The synthesis method comprises the steps as follows: taking 1,3-dichloroacetone as a starting material, carrying out Gabriel reaction on the 1,3-dichloroacetone and phthalimide potassium in a water phase or an organic phase to obtain a high-purity intermediate (I), 2-(3-chloro-2-oxopropyl)isoindoline-1,3-diketone; reacting the intermediate (I) with malonic acid isopropyl ester or malonic acid diethyl ester in alkali condition to prepare an intermediate (II), 2-(3-(2,2-dimethyl-4,6-dioxo-1,3-dioxane-5-yl)-2-oxopropyl)isoindoline-1,3-diketone or an intermediate (III), 2-(3-(1,3-dioxoisobenzazole-2-yl)-2-oxopropyl)malonic acid diethyl ester; and hydrolyzing, decarboxylating and post-processing to obtain the high-purity 5-aminolevulinic acid hydrochloride.

The invention discloses a 4-[2-(substituted benzylidene) hydrazino]-5, 6, 7-trialkoxy quinazoline compound and a preparation method and application thereof. 4-[2-(substituted benzylidene) hydrazino]-5, 6, 7-trialkoxy quinazoline compound has the structure shown as the following general form (I). According to the preparation method, 2, 3, 4-trihydroxybenzoic acid, dimethyl sulfate, diethyl sulfate, carbinol, sulfuric acid, nitric acid, hydrogen, formamide, phosphorus oxychloride, 80% of hydrazine hydrate and aromatic aldehyde are adopted as raw materials, and synthesized to obtain a series of novel 4-[2-(substituted benzylidene) hydrazino]-5, 6, 7-trialkoxy quinazoline compounds through eight steps; and such compounds have excellent antitumous effects and high effects on restraining the fungi of plant, and can be applied to preparing anti-cancer drugs and anti-plant fungal pesticides.

The invention relates to a synthetic method of 2-cyanoethyl triethoxysilane, which belongs to the technical field of fine chemicals. The synthetic method comprises the following steps: dropwise adding absolute ethyl alcohol into a three-opening flask esterification device filled with 2-cyanoethyl trichlorosilane by virtue of a constant-pressure funnel, performing the synthetic reaction, wherein the molar ratio of the 2-cyanoethyl trichlorosilane to the absolute ethyl alcohol is 1: (2.5 to 2.8), adding a catalyst (acid diethyl ester) into the three-opening flask before the reaction, controlling the reaction temperature at 60 to 120 DEG C, controlling the dropwise adding time at 2h to 4h, performing secondary esterification for an esterified crude product, re-filling the constant-pressure funnel with 3mol of absolute ethyl alcohol under a decompressing condition (-0.03MPa to -0.05MPa), recycling the surplus absolute ethyl alcohol by adopting a distilling recycling device, and decompressing and distilling a crude product after the secondary esterification is completed to obtain a colorless transparent product, wherein the content can be controlled to be 99 percent or more, and cl is less than or equal to 5ppm.

A process for ethanolysis of PET is disclosed wherein a feed comprising PET is reacted with ethanol and recovering ethylene glycol and an aromatic diethyl ester such as diethyl isophthalate and/or diethyl terephthalate. PET, or a terpolymer comprising terephthalate monomer and ethylene glycol monomers, is reacted with ethanol and ethanol, diethyl terephthalate, ethylene glycol and optionally diethyl isophthalate are recovered. Recovered diethyl components can be subjected to liquid-phase oxidation to produce aromatic carboxylic acid. Acetic acid may also produced via liquid-phase oxidation of recovered diethyl components. The aromatic carboxylic acid can be used to form polymer.