148 results about "Diethyl ester" patented technology

The application belongs to the technical field of regenerated polyester, and particularly relates to a recycling method of waste polyester textiles, which comprises the following steps: decolorizing colored waste polyester textiles by using a decolorizing agent, wherein the decolorizing agent is one or more of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate; depolymerizing the decolorized polyester textiles by using a depolymerizing agent to obtain terephthalate, wherein the depolymerization rate of the decolorized polyester textiles is 98.0-100%; converting the terephthalate into DMT first, and then performing a re-polymerization reaction on the DMT, ethylene glycol, a catalyst and a functional additive to obtain regenerated PET. The application adopts a process of decolorizing first and then depolymerizing, and the decolorizing and depolymerizing are coordinated, so that the process is simplified, the energy consumption and pollution are reduced, and the economy and sustainability of the recycling of waste polyester textiles are improved.

The invention provides a method for synthesizing diethyl adipate through dynamic covalent chemical regulation. Comprising the following steps: S1, sequentially adding 80-120g of adipic acid, 160-240mL of absolute ethyl alcohol, 5-8g of a difunctional dynamic regulation and control carrier, 2-4g of a ternary composite catalyst, 1-2g of a synergistic additive and 100-150mL of a mixed solvent consisting of cyclohexane and methylbenzene into a 500mL four-neck flask provided with a thermometer, a water segregator and a pH sensor, and adjusting the initial pH value to 8.0-8.5; stirring and reacting for 6 to 8 hours at the rotating speed of 450 to 500r / min under the condition of 70 to 75 DEG C; and S2, after the reaction is finished, cooling to 25 DEG C, separating and recovering the bifunctional dynamic regulation and control carrier and the ternary composite catalyst, introducing CO2 into the filtrate to regulate the pH value to 5.0-5.5, releasing the captured moisture, and carrying out reduced pressure distillation under the conditions of 80-90 DEG C and-0.08 MPa to obtain diethyl adipate. By means of the rare earth ion-carbon quantum dot-ionic liquid ternary composite catalyst, efficient catalysis under the strong acid-free condition is achieved, and the catalyst recovery rate and the product purity are greatly improved.

The invention discloses a wide-voltage wide-temperature-range sodium-ion battery electrolyte and a preparation method and application thereof, and belongs to the technical field of sodium-ion battery electrolytes.The wide-voltage wide-temperature-range sodium-ion battery electrolyte comprises sodium salt, an organic solvent and an additive, the organic solvent is selected from one or more of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and triethylene glycol dimethyl ether, and the additive is selected from one or more of fluoroethylene carbonate, allyl-1, 3-propane sultone, 1, 3-propylene sultone, 1, 3-propylene sultone and 1, 3-propylene sultone. The additive is one or more of 1, 3-propyl sultone, methylene methane disulfonate, ethylene sulfate, trifluoromethanesulfonic anhydride, pentaerythritol bicyclic sulfate, tri (trimethylsilane) phosphate, tri (trimethylsilane) phosphite, tri (trimethylsilane) borate, acesulfame sodium and aluminum trifluoromethanesulfonate, and the additive is one or more of 2, 3-propylene sultone, methylene methane disulfonate, ethylene sulfate, trifluoromethanesulfonic anhydride, pentaerythritol dicyclosulfate, tri (trimethylsilane) phosphate, tri (trimethylsilane) phosphite, tri (trimethylsilane) borate, tri (trimethylsilane) phosphate and tri (trimethylsilane) borate. The electrolyte provided by the invention not only keeps high coulombic efficiency at low temperature, but also has good cycle stability at high temperature.

The invention discloses a medical antibacterial antistatic modified polyester cotton type fabric and a preparation method thereof, and relates to the field of fiber fabrics. When the medical antibacterial and antistatic modified polyester cotton fabric is prepared, pretreated lignin and p-aminosalicylic acid react to prepare pre-modified lignin; reacting the pre-modified lignin, aniline and p-aminosalicylic acid to obtain modified lignin; the preparation method comprises the following steps: reacting methyldiethanolamine with diethyl chloromethylphosphate to prepare an antibacterial flame-retardant monomer; terephthalic acid, ethylene glycol and the antibacterial flame-retardant monomer react to prepare modified polyester; the modified polyester and the modified lignin are extruded by an extruder and then spun and woven into the fabric. The medical antibacterial anti-static modified polyester cotton fabric prepared by the invention has good anti-static, flame-retardant, antibacterial and anti-light aging properties.

This invention provides an amino-modified copper-silicon catalyst, its preparation method, and its application, belonging to the field of catalyst technology. The copper oxide particles in the copper-silicon catalyst provided by this invention have a small particle size and high dispersibility on the silica surface, which can significantly improve the catalytic activity of the copper-silicon catalyst, thereby improving the selectivity of ethanol in the hydrogenation of diethyl oxalate. Example results show that, at 180℃ and a hydrogen-to-ester ratio of 25, the copper-silicon catalyst provided by this invention achieves a diethyl oxalate conversion rate of 96.66% and an ethanol selectivity of 84.72% for diethyl oxalate. Furthermore, after 270 hours of stable reaction, the diethyl oxalate conversion rate still reaches 94.7%, and the ethanol selectivity still reaches 66.29%, indicating that the copper-silicon catalyst does not show significant deactivation.

The application discloses a preparation method of a key intermediate of dapagliflozin, and belongs to the technical field of preparation of medical intermediates. The preparation method of the key intermediate of dapagliflozin comprises the following steps: 1, 1-ethoxy-4-methylbenzene is prepared by using p-cresol, sodium hydroxide and diethyl sulfate; 2, (4-ethoxybenzyl) phenyl sulfide is prepared by using 1-ethoxy-4-methylbenzene, thiophenol, a palladium catalyst, an alkali and an oxidant; 3, 1-benzyl-4-ethoxybenzene is prepared by using (4-ethoxybenzyl) phenyl sulfide under a hydrogen atmosphere; 4, 4-ethoxy-2'-chlorobenzhydrol is prepared by carrying out chlorination reaction on 1-benzyl-4-ethoxybenzene; and 5, 5-bromo-2-chloro-4'-ethoxybenzhydrol is prepared by carrying out bromination reaction on 4-ethoxy-2'-chlorobenzhydrol. The yield and purity of 5-bromo-2-chloro-4'-ethoxybenzhydrol prepared by the method are higher, the process is safer, and the production cost is reduced.

The present application relates to the technical field of treatment of maleic acid-containing wastewater, and in particular to a method for resource-based treatment of diethyl maleate process wastewater, comprising: first subjecting diethyl maleate process wastewater to a hydrolysis reaction and dealcoholization treatment to obtain dealcoholized wastewater; then mixing an appropriate amount of maleic anhydride with the dealcoholized wastewater to synthesize a sodium polyepoxysuccinate solution, which is a scale inhibitor with dual effects of scale inhibition and corrosion inhibition and has a huge market demand. The treatment process steps of the present application are simple, and no high-cost environmental protection treatment equipment and material investment are required. The obtained product can be sold directly in liquid form, and no secondary wastewater and waste gas are generated throughout the process, thereby achieving high environmental protection and good economic efficiency of diethyl maleate process wastewater treatment.

The invention discloses an electrolyte for a lithium battery, which comprises an organic solvent, a lithium salt and an additive, and the mass percentage ratio of the organic solvent to the lithium salt to the additive is (70-90): (5-20): (0.2-10); the organic solvent is composed of cyclic carbonate and chain carbonate in a mass ratio of (10-30): (70-90); the lithium salt is one or more of lithium hexafluorophosphate, lithium perchlorate and lithium tetrafluoroborate; the additives comprise a high-temperature stabilizer, an antioxidant and a film-forming accelerant, the cyclic carbonate is one or two of ethylene carbonate and propylene carbonate, and the chain carbonate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate. By optimizing the components of the electrolyte, the stability of the electrolyte at a high temperature is improved, and decomposition and side reactions are reduced, so that the performance of the battery in a high-temperature environment is improved, and the cycle life of the battery in a high-temperature environment is prolonged.

The present invention relates to a method of adding an isocitrate lyase specific inhibitor to a lactic acid fermentation process to block the production of succinic acid as a byproduct of fermentation. The specific inhibitor includes a combination of one or more of glycolic acid methyl ester, malonic acid dimethyl ester, hydroxymalonic acid diethyl ester, 3-nitropropionic acid ethyl ester, mercuric chloride, or 5,5'-dithiobis(2-nitrobenzoic acid) to effectively reduce the amount of succinic acid in the lactic acid.

The invention discloses the field of organic electronic materials, and particularly discloses a chain terminating molecule for straight-chain polyphosphocarbazole and a polymerization terminating method. The chain termination molecule is a carbazole derivative containing boronic acid pinacol ester, the core structure is'carbazole matrix-linking group-diethyl phosphate group ', and the linking group can be a butyl chain or a benzene ring; after a chain termination molecule is synthesized through a three-step reaction, a Suzuki coupling reaction is utilized to completely replace a residual Br site of straight-chain polyphosphocarbazole, and polymerization termination is realized. The bromine residual quantity of the product is less than or equal to 0.01 wt%, the molecular weight is stabilized at 6-7 monomeric units, and the molecular weight change rate is less than or equal to 5% after the product is dried and stored at 25 DEG C for 6 months; when the material is used as a hole transport layer, the laboratory small-area film thickness deviation is less than or equal to 10%, the corresponding perovskite assembly efficiency is greater than or equal to 23%, the 1000-hour attenuation rate is less than or equal to 15%, the defects of self-agglutination, poor stability and device performance fluctuation of the existing material are solved, the process is simple, and industrialization is easy.

The invention discloses a tetrazine probe synthon and a preparation method and application thereof.The preparation method comprises the following steps that under the inert atmosphere, diethyl cyanomethylphosphonate, 3-hydroxypropionitrile, 3-mercaptopropionic acid and hydrazine hydrate are mixed and then react at the room temperature, a sodium nitrite solution is added after the reaction is finished, then acid is continuously added till the reaction system reaches acidity, and a tetrazine probe synthon product is obtained; continuously reacting to obtain an intermediate; and dissolving the intermediate in a solvent in an inert atmosphere, adding triethylamine, slowly adding methanesulfonyl chloride, and reacting at room temperature to obtain the tetrazine probe synthon shown in the formula I. The invention further discloses a preparation method of the tetrazine probe synthon. The tetrazine probe synthon provided by the invention can perform series Heck reaction and HWE reaction, so that controllable combination of functional groups on two sides of a tetrazine coupling probe is realized under mild reaction conditions, and the functional groups on two sides are designed according to actual requirements to regulate and control photophysical properties of the probe. A brand new way is provided for developing a high-performance biological orthogonal fluorescent probe.

The application discloses a toughened composite polyurethane impact-resistant material based on dynamic covalent bond energy regulation, and belongs to the technical field of polyurethane materials. A double dynamic covalent network containing DA bonds and disulfide bonds is constructed by reacting polyurethane prepolymer, furfurylamine, cystine diethyl ester and bismaleimide, then nano molybdenum disulfide is modified by silane, then a metal-polyphenol / polymer composite interface layer is constructed on the surface of aramid fiber by tannic acid-iron complex and polyethyleneimine, finally, the components are mixed, impregnated and hot-pressed to obtain the composite polyurethane material. The application effectively dissipates impact energy through the reversible rupture and recombination of dynamic covalent bonds, and enhances the interfacial bonding force between components by using multiple interface modification, so that the material has excellent impact resistance, high strength, high ductility and efficient self-repairing function, solves the problems of easy damage of the interface of traditional composite materials, insufficient impact resistance and irreversible damage, and has wide application prospect in the fields of safety protection and buffer components.

The invention discloses a benzoxphosphine ligand and a complex and application thereof. The structure of the benzoxphosphine ligand is shown as a formula (I), in the formula (I), R1 is alkyl or aryl substituted oxazolidinyl or imidazoline, R2 is alkyl and / or aryl, and R3 is at least one of fluorine, carbazolyl and 2, 6-dimethoxyphenyl. According to the benzoxphosphine ligand disclosed by the invention, the metal iridium complex can be used as a catalyst to be applied to an asymmetric hydrogenation reaction of alpha-phenyl vinyl diethyl phosphate, and has excellent activity and relatively high enantioselectivity; moreover, the benzoxphosphine ligand disclosed by the invention can be directly synthesized from simple and easily available chiral aldehyde, and the preparation method is simple and easy to operate.

The invention relates to a waterborne polyurethane emulsion as well as a preparation method and application thereof. The preparation raw materials of the waterborne polyurethane emulsion comprise the following components: an isocyanate monomer, flame-retardant polyether polyol, polydimethylsiloxane, a hydrophilic chain extender and a small molecular alcohol chain extender. The flame-retardant polyether polyol is a polymer formed by [(bis (2-hydroxyethyl) amino) methyl] diethyl phosphate and an epoxy compound. According to the synthesized waterborne polyurethane coating, the synergistic effect of nitrogen, phosphorus and silicon is utilized, flame propagation can be effectively inhibited, the molten drop phenomenon can be remarkably inhibited, and the limit oxygen index and the vertical combustion grade of the material are greatly improved.

The application discloses a method for preparing N-ethoxyl oxalyl alanine ester by using a dynamic tubular reactor, which comprises the following steps: (1) reacting L-alanine, diethyl oxalate and 4-dimethylaminopyridine in the dynamic tubular reactor; (2) removing light components from the reaction solution; (3) reacting the reaction solution after removing the light components and ethanol in the dynamic tubular reactor; and (4) obtaining N-ethoxyl oxalyl alanine ester after removing the light components. Compared with traditional kettle reactors and tubular reactors, the method adopts the dynamic tubular reactor to prepare N-ethoxyl oxalyl alanine ester, and through the regulation of reaction parameters, the selectivity of key by-products N-oxamide and double N-oxamide can be effectively controlled below 2%. The process has the advantages of high reaction yield, high degree of continuous operation, significantly shortened reaction time and no use of high-toxicity materials such as benzene.

This invention discloses a method for synthesizing p-methylaminobenzoylglutamate diethyl ester. Using p-methylaminobenzoic acid and diethyl glutamate hydrochloride as raw materials, and carbonyl diimidazole as an ester activator, the specific synthesis method involves dissolving carbonyl diimidazole in a solvent under inert gas protection, stirring, adding p-methylaminobenzoic acid to generate the active ester, then adding diethyl glutamate hydrochloride and reacting. The mixture is then concentrated, cooled, water is added dropwise, filtered, and dried to obtain p-methylaminobenzoylglutamate diethyl ester. This method is simple, convenient, low-cost, and has a high yield, showing great promise for industrialization.

The invention discloses an electrolyte for a high-silicon-content lithium ion battery and a preparation method and application thereof.The electrolyte comprises a lithium salt, a film-forming additive, a nano additive and an organic solvent, the concentration of the lithium salt in the electrolyte is 1-2 mol / L, the film-forming additive is difluoromethyl diethyl phosphate, the mass content of the film-forming additive in the electrolyte is 3%-7%, and the mass content of the nano additive in the electrolyte is 1%-2%. And the nano additive is NiCo-MOF nano particles, and the mass content of the nano additive in the electrolyte is 0.3%-1.0%. The film-forming additive and the nano additive have a synergistic effect, so that the film-forming capability and the electrolyte retention capability of the negative electrode can be improved, the interface stability of the high-content silicon negative electrode is improved, and the capacity retention rate of the lithium ion battery is improved.

The utility model discloses a system for synthesizing N, N-bis (2-ethoxyl) aminomethyl diethyl phosphonate with low formaldehyde content, which comprises a reaction kettle I and a reaction kettle II, the reaction kettle I and the reaction kettle II are jacketed reaction kettles, and the reaction kettle I and the reaction kettle II are respectively provided with a top feed port and a bottom discharge port. A bottom discharge port of the reaction kettle I is communicated with a top feed port of the reaction kettle II, a reflux cooling assembly is arranged at the top of the reaction kettle I, and a bottom discharge port of the reaction kettle II is connected with a product storage tank. After diethanol amine and paraformaldehyde are reacted in a reaction kettle I, a water-carrying agent is added for azeotropic reflux water separation so as to realize azeotropic separation of water generated in the reaction, so that the purpose of rapidly and efficiently preparing the MHPZ intermediate is achieved, excessive formaldehyde is removed in the water-carrying process, and synthesis and preparation of N, N-bis (2-ethoxyl) aminomethyl diethyl phosphonate with low formaldehyde content are realized.

The invention relates to an internal sulfonamide compound and a preparation method thereof. The invention relates to a preparation method of a sulfamide compound, which comprises the following steps: mixing an aminomalonic acid diethyl ester compound or an N-benzyl malonic acid monomethyl ester monoamide compound, a beta-aryl vinyl sulfonyl fluoride compound and MS, adding a solvent and a base catalyst, reacting at room temperature for 12-24 hours, separating and purifying to obtain the amide compound. The sulfamide compound and the preparation method thereof have the advantages of being simple in method, free of transition metal catalysis, wide in substrate range, mild in reaction condition, good in universality and the like.

A biphenylthiourea carboxylic acid metal organic framework crystal material and a preparation method and application thereof.The material has the following chemical formula: {[Zn4O(L)3]·DMF·H2O} n , wherein L is a 6-thio-6,7-dihydro-5H-dibenzo[d,f][1,3]diazepine-3,9-dicarboxylate divalent anion, and n is a degree of polymerization.The metal organic framework crystal material of the present application is synthesized by a solvothermal method, is simple to operate, has low cost, high yield, and is easy to mass industrial production.The prepared metal organic framework crystal material has a high specific surface area (a BET specific surface area of 594 m 2 / g), and an adsorption amount of CO2 of 46.0 cm 3 / g at 1 atm and 273 K.The biphenylthiourea carboxylic acid metal organic framework crystal material of the present application can efficiently catalyze a Friedel-Crafts alkylation reaction of substituted indole and substituted trans-nitrostyrene to generate an indole 3-substituted derivative, and can also efficiently catalyze a Michael addition reaction of diethyl malonate and substituted trans-nitrostyrene, both of which have mild conditions, and the catalyst can be recycled with almost no activity loss, and are good heterogeneous catalysts.

The present application discloses a secondary battery, a method for preparing the secondary battery, a battery module, a battery pack and an electric device. The secondary battery includes an electrolyte and a positive electrode sheet, wherein the positive electrode sheet includes a molecular formula of Li a Ni b Co c M1 d M2 e O f A g The layered material, M1, M2, A, a, b, c, d, e, f, and g are respectively as defined herein, the electrolyte includes a compound containing a phosphorus-oxygen double bond, and the compound containing a phosphorus-oxygen double bond includes one or more of lithium difluorophosphate, diethyl (2-cyanoethyl) phosphonate, tripropyl phosphoric anhydride, diethyl acetyl phosphate, and triphenyl phosphate. Based on the total mass of the electrolyte, the mass percentage of the compound containing a phosphorus-oxygen double bond is x% and 0<x≤1.0, and the secondary battery satisfies c+x / 10≥0.10. The present application can increase the lithium ion diffusion rate of low-cobalt or cobalt-free positive electrode active materials and improve the cycle performance of secondary batteries.

The invention relates to the technical field of synthesis of high molecular material sulfone polymers, in particular to a halogen-free environment-friendly end-capping reagent and a method for carrying out end capping on sulfone polymers by using the halogen-free environment-friendly end-capping reagent. At least one halogen-free environment-friendly end-capping reagent selected from methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, trimethyl carbonate, propylene carbonate and ethylene carbonate is introduced; and at least one ionic liquid selected from the group consisting of 1-ethyl-3-methylimidazole acetate, 1-ethyl-3-methylimidazole methane sulfonate, tetrabutylammonium p-toluenesulfonate and choline acetate is used as a catalyst. According to the method, the problems of environmental pollution and toxic residues caused by a traditional halogen end-capping reagent are effectively avoided. The invention also keeps the bisphenol monomer slightly excessive. And the prepared polysulfone resin has the advantages of obviously enhanced terminal group stability, pure color, high transparency and low chlorine content, and is suitable for the high value-added application fields of medical instruments, food contact materials, electronic devices and the like.

The application discloses a kind of 1,2-naphthalene dicarboxylic acid diethyl compound photocatalytic synthesis method, it includes the following steps: styrene compound, alpha-diazo iodonium salt and catalyst are dispersed in organic solvent, then coupling cyclization reaction is carried out under light, obtains 1,2-naphthalene dicarboxylic acid diethyl compound.The 1,2-naphthalene dicarboxylic acid diethyl compound photocatalytic synthesis method of the application has the advantages that raw material is cheap and easy to obtain, simple and efficient, reaction condition is mild, atom economy is high, product is easy to purify, production cost is low, green and safe, suitable for large-scale industrial production.

The invention relates to the technical field of water pollution control, in particular to a waste ore-based water dephosphorization agent and a preparation method thereof. The phosphorus removal agent is prepared by taking steel slag and red mud as matrixes through water activation and mixing, ZrO2 doping, PNQE ligand grafting and ternary metal cluster loading. Wherein the PNQE ligand is synthesized through step-by-step reaction of raw materials such as ethanediamine and diethyl chloromethyl phosphate. According to the phosphorus removal agent, organophosphorus is oxidized through anthraquinonyl, phosphorus is synergistically adsorbed through phosphonic acid groups and metal clusters, efficient removal of organophosphorus and inorganic phosphorus is achieved, and the phosphorus removal agent is good in cycling stability, wide in pH adaptability and low in heavy metal dissolution and has resource utilization and environmental protection benefits.

The application discloses a preparation method of a phenopicolinic acid intermediate and the intermediate. The preparation method comprises the following steps: under the action of an alkali, compound 2 is reacted with 1,3-propanedione dicarboxylic acid diethyl ester in a solvent to obtain compound 3 as shown in the figure. The intermediate involved in the preparation method is protected by triphenylmethyl, can be purified through recrystallization, has high yield, the reagent used is safe, the operation is simple, the production cost is low, the yield and purity of the obtained product are high, and the method is beneficial to industrial mass production.

The present application relates to phenylethyl malonic acid diethyl ester heating technical field, specifically, it is a kind of phenylethyl malonic acid diethyl ester reaction heating device capable of uniform heating.It includes heating tank, feeding opening, discharge port and heater, heating tank is fixedly provided with sleeve inside, the sleeve is used to separate the inner wall of heating tank and sleeve into liquid storage cavity and shunt cavity, liquid storage cavity is located above shunt cavity, auxiliary liquid mixing stirring mechanism is arranged in the inner ring of sleeve, reciprocating mechanism is arranged at the top end of sleeve inside and the end of stirring mechanism.Liquid inside the sleeve is guided into the liquid storage cavity, then steam in the heater flows outward through shunt ring and steam pipe, the flowing steam can continuously conduct heat to the shunt ring, the shunt ring conducts heat to the sprayed liquid, and the sprayed liquid is divided into two streams under the action of shunt ring, so that the contact area of liquid and shunt ring is increased, thereby improving the efficiency of heat transfer and enhancing the uniformity of heat conduction.

The invention discloses a smoke-suppressing low-toxicity flame-retardant floor board and a preparation method thereof. The method comprises the steps that S1, wood is placed in a mixed solution of imidazole diethyl phosphate and a Lewis acid catalyst, vacuum impregnation and heating and pressurizing impregnation are sequentially conducted, and the wood is drained after impregnation; the wood is sequentially placed in a chitosan solution, a metal salt solution and an alkaline solution to be subjected to pressure dipping, and complexing flame retardant modified wood is obtained after draining and washing; and S2, the complex flame retardant modified wood is soaked in a water-soluble charring agent solution, drained after being pressurized and soaked, washed with water and dried, and the flame retardant modified wood is obtained. The imidazole diethyl phosphate is obtained by carrying out condensation reaction on 1-(3-aminopropyl) imidazole and (formyl methyl) diethyl phosphate in a mass ratio of (0.5-0.7): 1. The problems that a current floor board is poor in flame retardant property durability, high in smoke density and low in carbon residue amount can be effectively solved.

Electrolyte composition for batteries, the electrolyte composition comprising: ethylene carbonate; Diethyl carbonate; Ethyl methyl carbonate; vinylethylene carbonate; vinyl carbonate; Propane-1,3-sultone; ethylene sulfate; and lithium difluorophosphate; and wherein the ethylene carbonate, the diethyl carbonate and the ethyl methyl carbonate are each present in the electrolyte composition in an amount of 10 parts by weight to 50 parts by weight based on 100 parts by weight of the electrolyte composition; wherein the ethylene carbonate, the diethyl carbonate and the ethyl methyl carbonate are present in a ratio of 1:1:1; wherein the vinylethylene carbonate is present in the electrolyte composition at 0.5 parts by weight based on 100 parts by weight of the electrolyte composition; wherein the vinyl carbonate is present in the electrolyte composition at 1.0 part by weight based on 100 parts by weight of the electrolyte composition; and wherein the propane-1,3-sultone is present in the electrolyte composition at 1.5 parts by weight based on 100 parts by weight of the electrolyte composition.

The application discloses a kind of 3-(cholic acid pentanoyl amide) cyclobutane-1,1-dicarboxylic acid purification method, belong to the technical field of pharmaceutical chemistry intermediate purification.The method includes: (1) its precursor diethyl ester is hydrolyzed in methanol and / or acetonitrile, concentrated after dissolving with water, with organic solvent extraction is discarded organic phase, water phase is adjusted to 2-4 to pH, again with organic solvent extraction, concentrated and obtained crude product;(2) the crude product is dissolved in alcohol solvent, after filtration, ester solvent is added to crystallize, alcohol ester volume ratio 1:2-1:10, filtration, washing, drying.The application removes unreacted ester, monocarboxylic acid byproduct and cholic acid analogue amide and other impurities by alkaline hydrolysis combined with "alkali dissolving acid extracting" and "alcohol dissolving-ester crystallizing" recrystallization.The product obtained by the method has HPLC purity ≥98.2%, yield ≥80%, and the process is stable, simple to operate, suitable for large-scale production.

The utility model discloses a diethyl carbonate loading cooling and heat preservation device which comprises a bottom plate, a plurality of first cooling plates transversely arranged at the top end of the bottom plate, a plurality of second cooling plates longitudinally arranged at the top end of the bottom plate, a first water inlet pipe and a first water outlet pipe, the first water inlet pipe and the second water outlet pipe are connected with each second cooling plate, the first water outlet main pipe is connected with the first water outlet pipes jointly, the second water outlet main pipe is connected with the second water outlet pipes jointly, and the first water inlet main pipe is connected with the water inlet ends of the first water inlet pipes jointly. The first water inlet main pipe is connected with the water inlet ends of the first water inlet pipes, the second water inlet main pipe is connected with the water inlet ends of the second water inlet pipes, the first water tank is connected with the first water outlet main pipe and the second water outlet main pipe, the cooler is connected with the first water tank, and the first water inlet main pipe and the second water inlet main pipe are both connected with the second water tank. According to the utility model, the purpose of cooling and heat preservation when diethyl carbonate is loaded and transported can be achieved.