193 results about "Ethyl carbonate" patented technology

The invention belongs to the technical field of recycled polyester, and particularly relates to a waste polyester textile recycling method which comprises the following steps: decolorizing colored waste polyester textiles by adopting a decolorizing agent which is more than one of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate; the depolymerization agent is adopted to depolymerize the decolored polyester textile to obtain the terephthalate, and the depolymerization rate of the decolored polyester textile is 98.0-100%; firstly, terephthalate is converted into DMT, and then DMT, ethylene glycol, a catalyst and a functional additive are subjected to a repolymerization reaction to obtain regenerated PET. According to the method, a process of decoloring and depolymerizing sequentially is adopted, and decoloring and depolymerizing are coordinated, so that the process is simplified, the energy consumption and pollution are reduced, and the economical efficiency and sustainability of waste polyester textile recycling are improved.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece, the positive pole piece comprises a positive active material layer, and the positive active material layer comprises lithium-containing phosphate of an olivine structure; the electrolyte comprises, by mass, 8-30% of a carboxylic ester solvent, a lithium salt and an unsaturated ester additive, the lithium salt comprises lithium hexafluorophosphate and fluorine-containing lithium sulfimide, the mass content of the fluorine-containing lithium sulfimide in the lithium salt is 18-45%, the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%, and the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%. The unsaturated ester additive comprises one or more of vinylene carbonate, vinylethylene carbonate, allyl ethyl carbonate and a fluoro-carbonate additive; the amount of electrolyte in the battery cell is 2.8 g / Ah to 3.2 g / Ah. According to the invention, rapid charging and use reliability of the single battery can be considered.

The invention belongs to the technical field of regenerated polyester, and particularly relates to a waste cotton-polyester blended fabric recycling method which comprises the following steps: firstly, decolorizing a colored waste cotton-polyester blended fabric by adopting a decolorizing agent, then mixing a depolymerizing agent, isosorbide dimethyl ether, a first catalyst and the decolorized cotton-polyester blended fabric, and then carrying out depolymerization reaction, the decolorizing agent and the depolymerizing agent are more than one of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate, and the temperature of the depolymerizing reaction is 130-150 DEG C; washing the separated cotton fibers with water, and screening to remove residual polyester powder on the surfaces; firstly, terephthalate is converted into DMT, and then DMT, ethylene glycol, a second catalyst and a functional additive are subjected to a repolymerization reaction to obtain regenerated polyethylene glycol terephthalate. According to the method, depolymerization and polyester cotton separation processes are ingeniously fused, so that the operation steps are simplified, the energy consumption is reduced, and the purity of a depolymerization product is also improved.

The invention provides a low-temperature electrolyte, positive electrode slurry and a low-temperature sodium ion battery, and belongs to the technical field of battery materials. The low-temperature electrolyte provided by the invention comprises sodium hexafluorophosphate, propylene carbonate, ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate, fluoroethylene carbonate, 2, 2, 3, 4, 4, 4-hexafluorobutyl acrylate and 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether. The battery provided by the invention comprises the low-temperature electrolyte. The low-temperature electrolyte and the low-temperature sodium-ion battery provided by the invention not only can be compatible with a blended positive electrode material, but also can give consideration to low-temperature performance, ensure that the prepared low-temperature sodium-ion battery has good reaction kinetics and cycle performance, and also can improve the energy density of an electrode and reduce the resistivity of powder.

The invention belongs to the technical field of regenerated polyester, and particularly relates to a waste polyester-spandex blended fabric recovery method, which comprises the following steps: carrying out decoloration and depolymerization on a colored waste polyester-spandex blended fabric by using a treating agent; and depolymerizing the decolored polyester fabric by using a depolymerizing agent to obtain the terephthalate. Wherein the treating agent is more than one of dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate; the depolymerizing agent is the same as the treating agent; the depolymerization rate of spandex in the waste polyester-spandex blended fabric is 98-100%, and the decolorization rate of the waste polyester-spandex blended fabric calculated according to the K / S value is 98% or above. The method breaks through the bottlenecks of high pollution and high energy consumption of the traditional process, and solves the contradiction that component separation and decoloration are difficult to take into account in the recovery process of the blended fabric.

The utility model relates to the technical field of preparation of methyl ethyl carbonate, in particular to a device for preparing methyl ethyl carbonate, which comprises a preparation tank, a stirring component is mounted in the preparation tank, and a lifting disc can enable production raw materials of methyl ethyl carbonate to enter an inner cavity of the lifting disc from a circular hole of an upper annular sheet in the lifting process; the stirring and mixing efficiency is preliminarily improved, meanwhile, the multiple stirring paddles can be driven to slide in a lifting mode, normal horizontal rotary stirring of the stirring paddles is not affected, and the stirring paddles can conduct lifting, mixing and stirring while horizontally stirring and mixing methyl ethyl carbonate production raw materials. The heating resistance ring is sleeved on the lifting rod for driving the lifting disc to lift and slide, and the heating resistance ring is electrified to enable the heating resistance ring, the lifting rod and the whole lifting disc to be electrified and heated, so that the heating efficiency of the methyl ethyl carbonate production raw materials can be improved.

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 discloses a non-selective sodium-ion battery electrolyte suitable for low temperature and a preparation method thereof, and relates to the field of batteries, and the sodium-ion battery electrolyte is composed of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, vinylene carbonate and sodium hexafluorophosphate. The sodium ion battery low-temperature electrolyte with uniform components is obtained by regulating and controlling the proportion of the basic components and mixing the basic components with the additive with proper content, the freezing point of the electrolyte is reduced, the capacity retention ratio of the battery at low temperature is improved, and a new thought is expected to be provided for widening the low-temperature application scene of the sodium ion battery.

The present invention discloses a method for alkylating polyester materials in which carbonate or carboxylate participates, and relates to comprehensive utilization of waste resources and cascade utilization of raw materials. The product of the method of the present invention is carboxylate and ethylene carbonate or diol. Taking PET as an example, the method uses multiple types of green ionic liquid catalysts, multiple types of carbonate or carboxylate such as dimethyl carbonate (DMC) or dimethyl malonate as methyl sources, and realizes the directional upgrading of PET to DMT under methanol-free conditions, and then DMC captures the generated ethylene glycol in situ, and forms five-membered cyclic ethylene carbonate through dehydration and cyclization. The present invention can be used for the depolymerization upgrading of waste PET materials, and other aromatic or alkyl carboxylic acid compounds (benzoic acid, p-methylbenzoic acid, 4-formylbenzoic acid, cyclohexanoic acid and n-pentanoic acid), similar polyesters and polycarbonates (polyethylene succinate, polyethylene adipate and polyethylene 2,5-furandicarboxylate) are also suitable for the recovery strategy of the present invention.

The invention belongs to the technical field of secondary batteries, and particularly relates to an electrolyte and a preparation method thereof and a secondary battery, the electrolyte comprises an organic solvent, a lithium salt and an additive, the mass of the organic solvent accounts for 80-93% of the total mass of the electrolyte, and the mass of the lithium salt accounts for 6-15% of the total mass of the electrolyte. The mass of the additive accounts for 1-8% of the total mass of the electrolyte; wherein the organic solvent comprises a linear carbonic ester solvent and a cyclic carbonic ester solvent, the mass of the linear carbonic ester solvent accounts for 60%-85% of the total mass of the organic solvent, and the mass of the cyclic carbonic ester solvent accounts for 15%-40% of the total mass of the organic solvent. Compared with the prior art, the electrolyte provided by the invention has the advantages that the low-temperature performance of the battery can be remarkably improved under the condition that a large amount of propylene carbonate, methyl ethyl carbonate, carboxylic ester solvents and low-temperature additives are not required to be used by precisely regulating and controlling the mass ratio of the organic solvent to the lithium salt to the additives in the electrolyte.

The invention relates to the technical field of organic carbonate synthesis, in particular to a method for synthesizing methyl ethyl carbonate by using a liquid heterogeneous catalyst to catalyze transesterification, which comprises the following steps: by taking long-chain tertiary amine as a catalyst, catalyzing dimethyl carbonate and diethyl carbonate to perform transesterification reaction in a liquid heterogeneous manner to synthesize the methyl ethyl carbonate. The liquid heterogeneous catalyst expands the variety of catalysts for synthesizing methyl ethyl carbonate through ester-ester exchange, does not need to be specially filled, is high in equipment utilization rate and free of abrasion and corrosion to equipment, and has the advantages of being easy to disperse uniformly, high in catalytic efficiency, convenient to feed, convenient to use and the like.

The invention relates to the technical field of organic carbonate synthesis, in particular to a method for synthesizing methyl ethyl carbonate by using long-chain tertiary amine to catalyze ester exchange, which comprises the following steps: by taking 0.3-10% of long-chain tertiary amine as a homogeneous catalyst, reacting dimethyl carbonate with ethanol for 3-8 hours at 70-85 DEG C according to the mass part ratio of 1.6-10: 1 to prepare the methyl ethyl carbonate. The long-chain tertiary amine catalyst has no corrosion to equipment, is high in ester exchange catalytic activity and convenient to use, shows stability and water resistance superior to those of sodium alkoxide, and has relatively high cost performance.

The invention discloses a molecular sieve catalyst for synthesizing methyl ethyl carbonate by a transesterification method and a regeneration method, and relates to the technical field of molecular sieve catalysts, the molecular sieve catalyst comprises a microporous double-active-center inner core and an amphoteric mesoporous shell; the microporous double-active-center core takes the X-type zeolite as a carrier to load potassium, cesium, lanthanum and barium; the amphoteric mesoporous shell is an MCM-41 and SBA-15 composite mesoporous silica layer coating the outer part of the inner core and has a double-mesoporous structure, amino propyl triethoxy silane and carboxyethyl triethoxy silane are grafted on the surface of the amphoteric mesoporous shell, and zirconium and titanium are co-doped. According to the invention, collaborative optimization of active centers and mass transfer channels is realized through a core-shell structure of a microporous double-active-center core and an amphoteric mesoporous shell. The activity and selectivity of catalytic transesterification are remarkably improved by the microporous core; due to the double-mesoporous structure and surface functional modification of the amphoteric mesoporous shell, the mass transfer efficiency of reactants and products is improved, and the adaptability of the catalyst to a reaction system is enhanced.

The invention discloses a low-temperature electrolyte for a laminated soft-package lithium ion battery, the lithium ion battery and a preparation method of the lithium ion battery. Comprising the following components: 4%-6% of propylene carbonate, 9%-11% of diethyl carbonate, 30%-32% of methyl ethyl carbonate, 24%-26% of ethylene carbonate, 9%-11% of ethyl propionate, 14%-16% of electrolyte salt and 3.6%-4.0% of an additive, according to the low-temperature electrolyte and the lithium ion battery, the solvent and the additive of the electrolyte are optimally combined, so that the obtained electrolyte has the characteristics of high conductivity and low impedance at low temperature, the low-temperature charge-discharge performance of the lithium ion battery can be remarkably improved, in addition, the obtained low-temperature electrolyte and the lithium ion battery have wide application prospects, and the application prospect is wide. And the method is especially suitable for the field with high low-temperature performance requirements.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece, an isolating membrane and a negative pole piece, and the positive pole piece comprises lithium-containing phosphate with an olivine structure; the electrolyte comprises a linear carboxylic ester solvent, a cyclic carbonate solvent and an additive, wherein the viscosity of the linear carboxylic ester solvent at normal temperature is 0.4 mPa.s to 0.6 mPa.s; the cyclic carbonate solvent comprises at least one of ethylene carbonate and propylene carbonate; the additive comprises at least one of a borate additive, a sulfonate additive, a silane-based additive and an unsaturated ester additive, and the unsaturated ester additive comprises one or more of vinylene carbonate, vinylethylene carbonate, allyl ethyl carbonate and a fluoro-carbonate additive. And the mass content of the additive in the electrolyte is 0.5-6%. According to the invention, rapid charging and use reliability of the battery can be considered.

The invention discloses a novel solvent system-based low-temperature lithium battery electrolyte and a production process, the novel solvent system-based low-temperature lithium battery electrolyte comprises the following components: a carbonic ester solvent, a lithium salt combination and an additive, the carbonic ester solvent comprises ethylene carbonate, fluoroethylene carbonate, 1, 3-dioxolame and ethyl methyl carbonate, and the lithium salt combination comprises a lithium salt combination and an additive; the lithium salt combination is a mixed system of lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate, and the additives are vinylene carbonate, succinonitrile, lithium nitrate, triphenyl phosphate and aluminum trifluoromethanesulfonate; according to the low-temperature lithium battery electrolyte, the performance bottleneck of a traditional electrolyte at the temperature of-40 DEG C to-30 DEG C is broken through through multi-level cooperation of solvent-lithium salt-additive preparation of the low-temperature lithium battery electrolyte, the solvent maintains low viscosity while reducing the freezing point, and low-temperature high dissociation and interface stability are achieved through lithium salt compounding; the compatibility of the solid electrolyte interfacial film structure and current collection is finely regulated and controlled through the additive, and the application requirement in the extremely cold environment is met.

The invention discloses a battery grade methyl ethyl carbonate / diethyl carbonate synthesis process, which adopts a transesterification method, and dimethyl carbonate (DMC) and ethanol react under the catalysis of sodium methoxide to generate methyl ethyl carbonate (EMC), diethyl carbonate (DEC) and byproduct methanol. High-purity battery-grade EMC and DEC products are obtained through the steps of reactive distillation, azeotrope separation, methanol refining, catalyst carbonization removal, crude EMC / DEC separation, EMC light component removal, industrial-grade EMC refining, battery-grade EMC refining, industrial-grade DEC refining, battery-grade DEC refining and the like. The method has the advantages of simple process flow, low energy consumption, easiness in product separation, high product purity and the like, and is suitable for large-scale production of battery-grade carbonate products.

This invention proposes a lithium-ion battery electrolyte and its application. The electrolyte comprises at least the following components: a fluorinated solvent, including 2,2-difluoroethyl acetate, fluoroethylene carbonate, and 2,2-difluoroethyl ethyl carbonate; a lithium salt, including a first lithium salt comprising lithium hexafluorophosphate; and an additive, including a first additive comprising lithium difluorobis(oxalato)phosphate. The lithium-ion battery electrolyte and its application proposed in this invention can improve the electrolyte's high-voltage resistance and kinetic performance, reduce battery impedance, and enhance the battery's fast-charging performance and high-temperature cycle stability.

This invention relates to a safety control method and system for the preparation of ethyl methyl carbonate (EMC). The method involves feeding dimethyl carbonate into an EMC purification tower, monitoring the pressure within the tower, and adjusting the pressure if it falls outside a preset range. The purity of the output dimethyl carbonate is also monitored. The output dimethyl carbonate, a sodium methoxide / methanol solution, and anhydrous ethanol are mixed in a specified ratio in a raw material mixing unit to achieve the required homogeneity. Pressure and temperature are monitored in an EMC reaction tower; if these requirements are not met, pressure or temperature is adjusted. The bottom liquid from the EMC reaction tower is transferred to a waste catalyst concentration tank for further processing, and then to an EMC light-weight removal tower for further treatment. Temperature and pressure are monitored within the EMC light-weight removal tower; if the pressure falls outside a preset range, pressure or temperature is adjusted. After cooling, the final EMC product is obtained. This process ensures safe and stable production of ethyl methyl carbonate.

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 invention relates to the technical field of organic synthesis, in particular to a synthesis method of vinylethylene carbonate, which comprises the following steps: (1) dehydrating an aprotic solvent; (2) dissolving chloroethylene carbonate in the aprotic solvent under the protection of inert gas, cooling, adding vinyl magnesium bromide, reacting at-10 to 0 DEG C, and adding a quenching reagent for quenching reaction after the reaction is finished, so as to obtain a vinylethylene carbonate crude product; and (3) purifying the vinylethylene carbonate crude product to obtain a vinylethylene carbonate pure product. According to the synthesis method of vinylethylene carbonate, the aprotic solvent is adopted and can be used as an electrolyte solvent, so that the influence of the solvent on the product quality is reduced, and the product purity is improved; meanwhile, vinyl magnesium bromide is used for carrying out nucleophilic substitution reaction on chloroethylene carbonate under a low-temperature condition, so that the reaction rate is high; and the obtained product has high purity and high yield.

The invention provides an electrolyte, a lithium iron manganese phosphate battery and an electric device. The electrolyte comprises a lithium salt and a solvent, the solvent comprises ethylene carbonate, propylene carbonate, ethyl methyl carbonate, fluorobenzene and a low-viscosity solvent in a volume ratio of (2-5): (2-5): (3-5): (3-5): (2-5). The high dielectric constants of ethylene carbonate and propylene carbonate improve the dissolving capacity of the electrolyte to lithium salt, and meanwhile, the molecular structure can form a stable interface layer on the surface of a positive electrode to inhibit migration and dissolution of manganese ions; due to the low viscosity characteristic of the low-viscosity solvent, the overall viscosity of the electrolyte is reduced, and the permeability of the porous positive electrode material is enhanced, so that the wettability is improved, and uniform de-intercalation of lithium ions is promoted; a physical adsorption protection layer can be formed on the surface of the positive electrode through the coordination effect of high-electronegativity fluorine atoms in fluorobenzene and manganese, and direct contact between manganese and electrolyte is further blocked.

An electrolyte for a battery cell, a battery cell for a vehicle and a method of forming a battery cell. The electrolyte includes a combination of lithium ion salts including lithium hexafluorophosphate (LiPF6), lithium bis(fluorosulfonyl)imide, and lithium difluoro(oxalato)borate. The electrolyte also includes a carbonate solvent including fluoroethylene carbonate, ethyl methyl carbonate, and a carboxylic acid ester exhibiting the following formula:wherein R1 and R2 are individually an unsubstituted alkyl group including in the range of 1 carbon to 2 carbons, wherein the combination of lithium ion salts is dispersed in the carbonate solvent. The electrolyte further includes vinylene carbonate. The electrolyte does not include ethyl carbonate.

The invention relates to the technical field of batteries, and discloses an electrolyte and application thereof, and a lithium carbon fluoride battery. The electrolyte comprises a lithium salt and an organic solvent; wherein the lithium salt is lithium bis (fluorosulfonyl) imide; the organic solvent is selected from one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene carbonate, propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, dimethylformamide, dimethylacetamide and dimethyl sulfoxide. The electrolyte can be applied to preparation of a lithium primary battery. The invention also relates to a lithium carbon fluoride battery comprising the electrolyte. The electrolyte system provides an optimized solution for the preparation of the high-energy-density lithium carbon fluoride battery, has a wide application prospect, can remarkably improve the performance of the battery, reduces the production cost, and promotes the further development of the lithium carbon fluoride battery technology.

The invention relates to the technical field of battery electrolytes, and discloses a lithium ion battery electrolyte for improving low-temperature charging activity, which comprises the following formula and proportion: 30% of ethylene carbonate (EC), 30% of dimethyl carbonate (DMC), 30% of methyl ethyl carbonate (EMC), 5% of fluoroethylene carbonate (FEC), 1 mol / L of lithium bis (trifluoromethanesulfonimide) (LiTFSI), 0.1 mol / L of lithium nitrate (LiNO3), 0.1 mol / L of lithium ion battery electrolyte, 0.1 mol / L of lithium ion battery electrolyte and the balance of water. According to the method, the low-temperature performance can be improved, the electrolyte formula and the preparation method contribute to remarkably improving the charging activity of the lithium ion battery in a low-temperature environment, normal charging of the battery can be ensured under a low-temperature condition (such as-20 DEG C and below), the problem of charging difficulty caused by low temperature is reduced, the usability of the battery in a cold environment is improved, and the service life of the battery is prolonged. For example, the method can be applied to outdoor electronic equipment, electric automobiles and the like in cold winter in northern China.

The application provides a low-temperature electrolyte, a positive electrode slurry and a low-temperature sodium ion battery, and belongs to the technical field of battery materials.The low-temperature electrolyte comprises sodium hexafluorophosphate, propylene carbonate, ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate, fluoroethylene carbonate, 2,2,3,4,4,4-hexafluorobutyl acrylate and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether.The battery comprises the low-temperature electrolyte.The low-temperature electrolyte and the low-temperature sodium ion battery can not only be compatible with blended positive electrode materials, but also take into account the low-temperature performance, ensure that the prepared low-temperature sodium ion battery has good reaction kinetics and cycle performance, and can also improve the energy density of the electrode and reduce the powder resistivity.

The invention discloses an all-component recovery method and application of a waste lithium ion battery electrolyte, and belongs to the technical field of resource utilization of lithium ion batteries. The method comprises the following steps: disassembling the waste battery in a light mineral oil environment to realize safe and efficient electrolyte collection; then adding a weak base solution into the electrolyte for reaction, selectively precipitating and recovering high-purity lithium salt; and finally, separating and purifying the organic solvent component through two-step reduced pressure distillation to obtain dimethyl carbonate, methyl ethyl carbonate and ethylene carbonate. The method does not need inert gas protection, is simple in process flow, low in cost and high in safety, effectively solves the problems that the electrolyte is easy to volatilize, inflammable and easy to pollute, wastes resources and the like in the traditional recovery process, realizes efficient recovery and high-valued utilization of valuable components in the electrolyte, can be used for preparation of regenerated electrolyte, and is suitable for industrial production. The method has good economic benefits and environmental benefits.

The invention specifically discloses a method for preventing a lithium carbon fluoride battery negative electrode from being corroded. The invention relates to a method for preventing corrosion of a negative electrode of a lithium carbon fluoride battery, which comprises the following steps: preparing the lithium carbon fluoride battery by using an electrolyte containing a first solvent and a second solvent in a formula, and controlling the ratio of the first solvent to the second solvent so that the volume ratio of the second solvent in a mixed solvent is less than 50%; wherein the first solvent comprises at least one of propylene carbonate, gamma-butyrolactone, ethylene carbonate, butylene carbonate and diethyl carbonate; the second solvent comprises at least one of ethylene glycol dimethyl ether, tetrahydrofuran, dimethyl carbonate and methyl ethyl carbonate. The electrolyte has the advantages that the content of free fluorine in the electrolyte for the lithium carbon fluoride battery is reduced, so that the storage stability and the use safety of the lithium carbon fluoride battery are improved.

The invention discloses a lithium ion battery low temperature electrolyte, the electrolyte comprises a lithium salt and a solvent, the solvent comprises a main solvent and an auxiliary solvent, the main solvent comprises methyl ethyl carbonate or / and isobutyl formate, and the auxiliary solvent comprises dimethyl sulfite or / and propylene trifluorocarbonate. The invention also discloses an application of the lithium ion battery low-temperature electrolyte in a lithium ion battery. When the electrolyte provided by the invention is applied to the lithium battery, the rate capability and the cycle performance are good at the normal temperature of 25 DEG C, and the electrolyte still has excellent charge-discharge energy and cycle life under the extremely cold condition of-40 DEG C.

This invention discloses a device and process for improving methanol utilization in carbonate production, belonging to the field of carbonate production technology. Dimethyl carbonate and ethanol are introduced into a reaction tower and reacted under the action of catalyst a to produce ethyl methyl carbonate, diethyl carbonate, and methanol as a byproduct. The atmospheric pressure azeotrope is distilled off from the top of the reaction tower and enters a pressurized tower for separation. Another atmospheric pressure azeotrope, with a mass ratio of dimethyl carbonate to methanol of 1:2.3-3.3, distilled off from the DMC reaction tower, also enters the pressurized tower. The ratio of dimethyl carbonate to methanol azeotrope is changed by increasing the operating pressure. Dimethyl carbonate collected from the bottom of the pressurized tower is sent to the EMC reaction tower as a raw material using pressure differential. The pressurized azeotrope, with a mass ratio of dimethyl carbonate to methanol of 1:8-9.5, distilled off from the top of the pressurized tower, is sent to the DMC reaction tower as a raw material. This invention solves the technical problem of low methanol utilization in existing processes and is mainly applied to carbonate production.