76 results about "Phosphorus trichloride" patented technology

The invention discloses a phosphorus trichloride production reaction kettle with a defoaming structure, and relates to the technical field of reaction kettles. According to the phosphorus trichloride production reaction kettle with the defoaming structure, through cooperation of the obliquely-installed sawtooth plates and the protruding strip rings, during rotation, the sawtooth plates drive foam on the liquid level to move towards the periphery, in the movement process, the foam on the liquid level is separated from the protruding strip rings, and the foam on the liquid level is removed. The sawteeth at the top of the sawtooth plate are in contact with accumulated foam, so that part of the foam is broken, the unbroken foam outwards impacts the inner wall of the convex strip ring under the action of centrifugal force, so that the foam is in contact with the convex strips uniformly arranged on the inner wall of the inner convex ring, and compared with a smooth inner wall of a traditional reaction kettle, the contact area is reduced when the convex strips of the inner convex ring are in contact with the foam; and the pressure during impact is increased, so that the foam is broken under higher pressure, and the defoaming effect is improved.

The invention discloses hydrolysis-resistant liquid phosphite ester and a preparation method and application thereof.The hydrolysis-resistant liquid phosphite ester is prepared by the steps that 2, 2, 4-trimethyl-1, 3-pentanediol and phosphorus trichloride or phosphite triester serve as raw materials, a cyclization reaction is conducted firstly, and then the hydrolysis-resistant liquid phosphite ester is obtained; and then carrying out nucleophilic substitution on Cl or aryl and alkyl on the cyclized intermediate by using higher saturated monohydric alcohol with more than C8, wherein the molecular structure is as shown in formula I in the specification. The liquid phosphite ester is novel liquid phosphite ester, the main body of the liquid phosphite ester is of a six-membered ring structure, the basic structure of the phosphite ester is reserved to the maximum extent, and the anti-oxidation effect of the phosphite ester is guaranteed; hydrophobic aliphatic chain structures on phosphorus atoms and branched chains of the phosphorus atoms prevent water molecules from approaching P-O bonds, so that the phosphorus atoms and the branched chains are prevented from being attacked by the water molecules, and the hydrolysis resistance is improved under the conditions that any additional amine hydrolysis-resistant agent is not used and any steric hindrance group is not introduced; good practical value, economic value and market prospect are realized.

The invention provides a preparation method of a phosphoramidite compound. The preparation method comprises the following steps: (1) mixing a nitrogen-containing compound and an acid-binding agent with a first solvent to obtain a first mixed solution; mixing phosphorus trichloride with a second solvent to obtain a second mixed solution; mixing aromatic diphenol with a third solvent to obtain a third mixed solution; (2) pumping the first mixed solution and the second mixed solution obtained in the step (1) into a first micro-mixer, and then enabling the first mixed solution and the second mixed solution to enter a first micro-channel reactor for reaction to obtain a reaction solution containing monochlorophosphoramidite; (3) enabling the reaction solution containing the monochlorophosphoramidite obtained in the step (2) and the third mixed solution obtained in the step (1) to enter a second micro-mixer, and then enabling the mixture to enter a second micro-channel reactor for reaction to obtain a phosphoramidite compound; the acid-binding agent is a polyether tertiary amine compound. The preparation method is short in reaction time and high in product yield.

This invention discloses a tail gas treatment absorption tower for phosphorus trichloride production. The invention relates to the technical field of tail gas treatment absorption towers and includes a shell. An annular plate is fixedly connected to the inner wall of the shell near the inlet pipe. The annular plate has a trapezoidal cross-section and multiple through holes in its center. Multiple elastic plates are symmetrically arranged inside each through hole, with two elastic plates forming a group. Within each group, two elastic plates are symmetrically arranged inside the through hole, and the elastic plates are inclined, forming a V-shape. In this phosphorus trichloride tail gas treatment absorption tower, the inlet pipe is tangentially oriented. This tangential inlet causes the tail gas to form a spiral upward airflow along the inner wall of the tower. The gas is further diverted through the evenly distributed through holes on the annular plate, thereby improving the uniformity of the gas flow velocity entering the bottom of the packing layer, ensuring no dead zones in gas-liquid contact, and extending the gas flow path within the tower.

The invention relates to the technical field of synthesis of hexafluorophosphate, in particular to a synthesis method and a synthesis system of liquid hexafluorophosphate. The synthesis method of the liquid hexafluorophosphate is a new process route, phosphorus trichloride is used as an initial raw material, and a reaction is carried out with a reaction kettle; phosphorus pentafluoride sequentially subjected to oxidation, fluorination, deep fluorination and solvent in-situ capture reacts with alkali metal fluoride to obtain liquid hexafluorophosphate; the whole technical route process has the advantages of controllability, low cost, greenness, high safety and few impurities.

The invention relates to the technical field of synthesis of chlorine-containing pyridine intermediates, and discloses a method for synthesizing 2, 3, 4, 5-tetrachloropyridine by using 2, 5-dichloropyridine, which comprises the following steps: step 1, preparation of 2, 5-dichloropyridine nitrogen oxide: taking 2, 5-dichloropyridine as a raw material, reacting in the presence of a catalyst and acetic acid, and then filtering to remove the catalyst to obtain 2, 5-dichloropyridine nitrogen oxide; adding an acetic acid solution of 2, 5-dichloropyridine nitrogen oxide; step 2, nitration reaction: adding sulfuric acid and nitric acid, and reacting to obtain 2, 5-dichloro-4-nitropyridine nitrogen oxide; step 3, nitrogen and oxygen removal reaction: adding acetyl chloride to replace 4-position nitro to obtain 2, 4, 5-trichloropyridine nitrogen oxide, and then adding phosphorus trichloride to remove nitrogen and oxygen to obtain 2, 4, 5-trichloropyridine; and 4, chlorination and refining: adding Lewis acid into the 2, 4, 5-trichloropyridine, reacting to obtain a 2, 3, 4, 5-tetrachloropyridine crude product, and refining the crude product to obtain the finished product 2, 3, 4, 5-tetrachloropyridine. The invention solves the problems of more byproducts and unsatisfactory product purity and yield in the prior art.

The invention discloses a preparation method of tris (2-cyanoethyl) phosphate, which comprises the following steps of: 1, adding 3-hydroxypropionitrile, an organic alkali acid-binding agent and a reaction organic solvent which is one of dichloromethane and dichloroethane into a reaction container, and reacting at the temperature of between 20 and 30 DEG C for 1 to 3 hours; controlling the temperature not to exceed 20 DEG C, dropwise adding a mixture formed by phosphorus trichloride and a reaction organic solvent, after dropwise adding is completed, performing heating reflux reaction, and after the reaction is completed, performing suction filtration to remove generated organic alkali hydrochloride so as to obtain filtrate; and 2, controlling the temperature of the filtrate obtained in the step 1 at 30-40 DEG C, introducing oxygen for reaction until the reaction is finished, and removing the reaction organic solvent to obtain the final product tris (2-cyanoethyl) phosphate. The method has the advantages of simplicity in operation, mild and controllable reaction, high product purity and suitability for industrial popularization.

The purpose of the present invention is to provide a production method for phosphorus trifluoride in which the reaction can be carried out using readily available materials at a temperature equal to or lower than atmospheric temperature, said method being suitable for use on an industrial scale.　The production method for phosphorus trifluoride involves reacting phosphorus trichloride and hydrogen fluoride in the presence of an organic solvent.

The present invention produces phosphorus trifluoride at a high yield by using readily available raw materials (phosphorus trichloride and hydrogen fluoride), and produces a high-purity phosphorus trifluoride by purifying an obtained product gas containing phosphorus trifluoride by using a method suitable for mass production.　The present invention pertains to: a method for producing phosphorus trifluoride, the method comprising (a) a step for reacting phosphorus trichloride with hydrogen fluoride to produce a product gas, and (b) a step for removing hydrogen chloride from the product gas; and a high-purity phosphorus trifluoride obtained by said method.

The application provides a reaction device and method for continuously synthesizing trimethyl phosphite, and belongs to the technical field of trimethyl phosphite synthesis. The reaction device comprises a raw material tank group, a composite reaction kettle, a solvent tank, a pre-cooler, a water washing kettle, an alkali liquid buffer tank, a layered system and a rectification system. The raw material tank group comprises a methanol tank and a phosphorus trichloride tank. The raw material tank group and the solvent tank are connected with the composite reaction kettle through pipelines via the pre-cooler, and the composite reaction kettle is connected with the water washing kettle through a pipeline. The phosphorus trichloride drop-like feed is efficiently converted into a uniform liquid film by a centrifugal disc, and then the liquid film is converted into a fine jet flow by a spraying ring. The fine jet flow is instantaneously and highly intensively sheared with a strong vortex-shaped methanol / solvent flow formed through a tangential feeding pipe. The secondary intensified mixing mode replaces the macroscopic mixing limitation of a traditional stirred tank, realizes instant and uniform mixing of materials at a micro level, thereby inhibiting a side reaction and effectively improving a reaction rate.

This invention discloses a chiral monophosphine ligand, its preparation method, and its application in asymmetric synthesis. The ligand preparation method involves mixing an N,N',1,2-tetrasubstituted ethane-1,2-diamine compound, phosphorus trichloride, triethylamine, and solvent under a nitrogen or argon atmosphere at -80 to -70°C, and reacting at 60 to 80°C for 6 to 8 hours. The resulting reaction mixture is then cooled to room temperature, and an alcohol, phenol, or Grignard reagent is added dropwise, reacting at 60 to 80°C for 8 to 12 hours. The resulting mixture is then post-treated to obtain the chiral monophosphine ligand. The application involves stirring a nickel catalyst, a chiral monophosphine ligand, a solvent, a diene, and an aldehyde under an argon or nitrogen atmosphere at a specified temperature for 12 to 15 hours. The mixture is then post-treated to obtain the target product. This method utilizes widely available and inexpensive raw materials, and the operation is simple, achieving high stereoselectivity and enantioselectivity in the synthesis of alcohol compounds containing chiral conjugated dienes through a one-step reaction.

The utility model relates to the technical field of phosphorus pentachloride production devices, in particular to a phosphorus pentachloride production device which comprises a reaction box and a cover body covering the upper end of the reaction box, a stirring assembly is arranged on the cover body, and a filtering unit is arranged at the upper end of the cover body. The filtering unit comprises a shell and a Z-shaped plate, the shell is fixedly connected with the cover body, the Z-shaped plate is fixed with the shell through a fixing assembly, and a chlorine supply assembly is arranged on the lower side of the reaction box. Meanwhile, chlorine is continuously conveyed into the reaction box through the chlorine supply assembly and filtered through the filtering unit, a Z-shaped plate sealing structure is adopted, when activated carbon in a filtering frame is replaced, the lower side plate face of a Z-shaped plate can automatically seal the reaction box, chlorine leakage is effectively prevented, and the safety and operation convenience of the device are remarkably improved.

The application belongs to the technical field of fine chemical product preparation, and particularly relates to a preparation method of diisooctyl phosphite intermediate and application of the intermediate in preparation of P507. The preparation method of the diisooctyl phosphite intermediate comprises the following steps: adding phosphorus trichloride into isooctanol by liquid dropping, controlling dropping speed, dropping pressure and reaction temperature, obtaining a diisooctyl phosphite mixture, removing impurities from the diisooctyl phosphite mixture by gas-phase ammonia neutralization or high-vacuum HCl removal, distilling chloroisoctane, collecting chloroisoctane byproduct, and finally obtaining diisooctyl phosphite. The preparation method of the diisooctyl phosphite intermediate is simple in operation, mild in condition, good in environmental protection, high in purity and yield of the prepared intermediate, and the application of the diisooctyl phosphite intermediate in preparation of P507 is high in purity of the prepared P507.

A method for synthesizing an antioxidant 168 by using a microchannel continuous flow process belongs to the technical field of chemical synthesis, adopts a microchannel esterification-microchannel ester exchange two-stage continuous process, and realizes the reaction of phosphorus trichloride and low-carbon chain alcohol to generate phosphorous acid dialkyl ester through the efficient mass transfer characteristic of a microchannel reactor in the esterification stage; hydrogen chloride generated by the reaction is immediately and directionally led out and recycled as industrial hydrochloric acid, a neutralizer does not need to be added, a microchannel reactor with an inner wall immobilized catalyst or a high-temperature and high-pressure strengthening process is adopted in the ester exchange stage, the reaction without catalyst residue or participation of the dialkyl phosphite and the 2, 4-di-tert-butylphenol is realized, no salt impurities are generated in the whole process, and the production cost is reduced. The method solves the problems of quality, cost, safety and the like caused by the use of a neutralizer, complex desalination, catalyst residue, salt-containing wastewater, remarkable amplification effect and the like in the traditional process, and has the industrial advantages of continuity, cleanness and high purity.

The invention belongs to the technical field of chemical synthesis, and relates to a lithium battery electrolyte raw material production technology, in particular to a preparation method of phosphorus pentafluoride. The method comprises the following steps: adding phosphorus trichloride, liquid chlorine and hydrogen fluoride into a reactor in proportion, and reacting to prepare hydrogen chloride and phosphorus pentafluoride; the molar ratio of phosphorus trichloride to liquid chlorine to hydrogen fluoride is preferably 1: 1: 5, and the reactor comprises a bottom reaction section, a middle filler section and a top condensation section. The working pressure of the reactor is 0.1-3.0 MpaG, the temperature of the reaction section is 0-40 DEG C, and the temperature of the condensation section is-20 to-60 DEG C. The mixed gas of phosphorus pentafluoride and hydrogen chloride can be prepared in one step and conveyed to the rear end to be refined and separated. The method has the advantages of simple process flow, easily available raw materials, low production cost and high efficiency.

This utility model relates to the field of phosphorus washing tower technology and discloses a phosphorus trichloride washing tower with enhanced separation. It includes a tower base, a tower section bolted to the top of the base, and two support blocks fixedly connected to the inner wall of the tower section. A packing support plate is bolted to the top of support block one, and a liquid dispersion assembly is bolted to the top of support block two. A suction pipe is fixedly connected to the outer surface of the tower base. By setting up the dispersion assembly, when the liquid enters the inlet pipe, it enters a rectangular tube. The liquid then exits from multiple outlet holes on its outer surface, thus undergoing primary dispersion before falling into multiple annular dispersion plates below. All the liquid flows out from multiple inclined slots and falls into the dispersion plates for secondary dispersion. Finally, the liquid exits from multiple through holes in the dispersion plates after a tertiary dispersion. This facilitates sufficient contact with phosphorus trichloride gas and improves the mass transfer efficiency during the phosphorus washing process.

The application provides a method for continuously preparing dichloro pentaerythritol diphosphite, relates to the technical field of chemical equipment, and comprises the following steps: step one, mixing pentaerythritol with an organic solvent to obtain a pentaerythritol suspension; step two, continuously performing esterification reaction on the pentaerythritol suspension and phosphorus trichloride in a scraped film reactor in one stage or multiple stages in series, discharging the generated HCl gas from the upper part of each scraped film reactor, and gradually flowing the reaction liquid discharged from the bottom of the scraped film reactor in multiple stages in series into the scraped film reactor in the next stage until the dichloro pentaerythritol diphosphite product solution is discharged from the bottom of the scraped film reactor, and the temperature of the esterification reaction is 30-100 DEG C. The application further provides a device for continuously preparing dichloro pentaerythritol diphosphite; and the scheme provided by the application has high yield, low energy consumption, and can continuously synthesize dichloro pentaerythritol diphosphite.

This utility model discloses a phosphorus trichloride tail gas absorption device, belonging to the technical field of phosphorus trichloride tail gas absorption devices. Key technical features include a support frame, with a cooling component fixedly connected to the top of the support frame. A spray device body is bolted inside the cooling component. A drying component is connected to the right side of the cooling component, and a purification component is connected to the right side of the drying component. The cooling component includes a tank, with an air inlet pipe connected to the inner wall of the tank. A first solenoid valve is connected to the top of the air inlet pipe, and a protective cover is fixedly connected to the top of the first solenoid valve. This invention addresses the problem that most existing phosphorus trichloride tail gas absorption devices initially pre-treat phosphorus trichloride tail gas through spraying. However, some phosphorus trichloride tail gas has a certain temperature, which may cause steam to be generated during the spraying process. This steam may affect the operation of subsequent structures.

The invention discloses a system and a method for cleaning a chlorination kettle for phosphorus trichloride production, the system comprises a chlorination kettle, the chlorination kettle is provided with a chlorine feeding pipeline, a yellow phosphorus feeding pipeline and a discharging pipeline, and the discharging pipeline is connected with a feeding port of a primary filtering device through a first material pump; a liquid phase outlet of the first-stage filtering device is connected with a feeding hole of the second-stage filtering device, and a solid phase outlet of the first-stage filtering device is connected with a feeding hole of the third-stage filtering device; a liquid phase outlet of the second-stage filtering device is connected with an inlet of the first-stage buffer tank, and a solid phase outlet of the second-stage filtering device is connected with a feeding hole of the third-stage filtering device; a liquid phase outlet of the third-stage filtering device is connected with a feeding hole of the first-stage filtering device, and a solid phase outlet of the third-stage filtering device is connected with an inlet of the second-stage buffering tank; an outlet of the primary buffer tank is connected with a feeding hole of the phosphorus washing tower through a second material pump; and the discharge hole of the phosphorus washing tower is connected with the reflux inlet of the chlorination kettle through a reflux pipeline. The method avoids the risks of byproduct acid generation, hydrogen accumulation, yellow phosphorus spontaneous combustion and the like, is high in efficiency and is suitable for industrial continuous production.

The invention discloses a phosphorus oxychloride preparation method based on a flat-plate membrane reactor, and belongs to the technical field of chemical processes and reactors. The reactor comprises a plurality of liquid chamber-gas chamber-liquid chamber functional units which are arranged repeatedly and heat exchange units located between the adjacent functional units, gas-liquid micro-interface contact is achieved through a porous hydrophobic membrane, and oxygen reacts with phosphorus trichloride in a molecular diffusion mode. According to the method, the reaction temperature is controlled to be 70-95 DEG C, the oxygen pressure is controlled to be 0.01-0.05 MPa, and the heat exchange medium is combined for circulating heat transfer, so that efficient utilization of oxygen is realized, and the reaction process is mild and controllable. The continuous operation of 3-5 reactors connected in series is supported, the oxygen utilization rate can be remarkably improved, the raw material consumption is reduced, the product purity is improved, continuous production is supported, and the method is suitable for large-scale synthesis of phosphorus oxychloride.

The utility model discloses automatic dropwise adding equipment for phosphorus trichloride, and relates to the technical field of chemical product production. The drip adding device comprises a drip adding storage tank, the upper surface and the interior of the drip adding storage tank are jointly provided with a stirring mechanism, the lower surface of the drip adding storage tank is communicated with an infusion tube, a drip tube body is arranged below the infusion tube, and a flow adjusting assembly is arranged between the infusion tube and the drip tube body. High-precision dynamic adjustment of the dropwise adding speed of phosphorus trichloride is achieved, the dropwise adding precision error is controlled within an extremely small range, the operation stability and reliability of automatic dropwise adding equipment are remarkably improved, the problems of material layering and impurity deposition in the dropwise adding storage tank are solved through the stirring mechanism, the design ensures that the concentration of a dropwise added solution is uniform, and the stability and reliability of the automatic dropwise adding equipment are improved. The pipeline blockage phenomenon is effectively prevented, the equipment maintenance frequency and the unplanned shutdown risk are remarkably reduced, and the production efficiency and safety are greatly improved.

The utility model discloses a chlorination kettle for producing phosphorus trichloride, which comprises support legs, a kettle body, a kettle cover and a stirring component, and further comprises a protective shell, the protective shell is sleeved outside the kettle body, a plurality of groups of springs and connecting support columns are fixedly connected between interlayers of the kettle body and the protective shell, the support legs are arranged on the protective shell, and the stirring component is arranged on the support legs. The kettle cover is detachably arranged on the kettle body, and the stirring assembly is arranged on the kettle cover; the stirring assembly comprises a driving shaft, a sleeve shaft, a stirring rod and a stirring blade, the sleeve shaft is rotatably arranged on the kettle cover and extends downwards into the kettle body, the stirring rod is arranged on the sleeve shaft, a mounting seat is arranged on the kettle cover, and the driving shaft is rotatably arranged on the mounting seat and rotatably penetrates through the sleeve shaft. The utility model relates to the technical field of phosphorus trichloride processing auxiliary devices, and particularly provides a chlorination kettle for producing phosphorus trichloride, which is better in stirring effect, higher in safety and convenient to clean and has a gas purification function.

The application provides benzyl alcohol modified humic acid and a preparation method and application thereof, and belongs to the oil displacement technical field. The preparation method comprises the following steps: mixing humic acid and deionized water to obtain a mixture I, adding acid KMnO4 to the mixture I after heating and temperature rising to an oxidation reaction temperature, and performing an oxidation reaction after heat preservation; after the oxidation reaction is completed, washing, centrifugation and freeze-drying are performed to obtain oxidized humic acid; the oxidized humic acid is mixed with a solvent to obtain a mixed solution; the benzyl alcohol, phosphorus trichloride and the solvent are mixed, a catalyst is added, the mixed solution is added, and temperature rising is performed to perform a reaction; after the reaction is completed, rotary evaporation, washing, standing, filtration and drying are performed to obtain benzyl alcohol modified humic acid. Humic acid is selected as a raw material to perform a first step of oxidation reaction, and a second step of modification of the oxidized humic acid by using benzyl alcohol is performed to prepare a kind of benzyl alcohol modified humic acid with a condensed polycyclic aromatic ring structure, which is an oil-soluble surfactant at normal temperature and is changed into a water-soluble surfactant according to the change of the formation environment.

The invention discloses a phosphorus trichloride tail gas treatment process meeting ultralow emission, and relates to the technical field of chemical environment-friendly tail gas purification, the phosphorus trichloride tail gas treatment process comprises the following steps: 1, pretreatment: pretreating phosphorus trichloride production tail gas to obtain pretreated tail gas; step 3, introducing the primary purified tail gas obtained in the step 2 into a multi-stage composite absorption tower, and carrying out at least two-stage countercurrent absorption by adopting a composite absorption liquid with a special formula to obtain secondary purified tail gas; and 5, deep treatment: carrying out deep treatment on the three-stage purified tail gas obtained in the step 4, sequentially carrying out demisting and deep adsorption, and discharging after reaching the standard. By constructing a three-stage treatment system of pretreatment, core purification and deep treatment and combining a combined process of cryogenic condensation, multi-stage composite absorption and catalytic oxidation, pollutants in the phosphorus trichloride tail gas are removed in a stepped mode, it is ensured that the tail gas emission concentration is far lower than the national ultra-low emission standard, and pollution to the atmospheric environment is remarkably reduced.

The invention discloses a method and a device for separating methyl phosphine dichloride, and belongs to the technical field of chemical intermediate separation, a reaction gas phase component enters a pre-separation zone of a dividing wall column, methane and hydrogen chloride are evaporated from the top of the dividing wall column, and the methane and the hydrogen chloride are recycled after passing through a tower top condenser; and discharging methyl phosphine dichloride and phosphorus trichloride from the bottom of the dividing wall column, and further separating. Chloralkane and a small amount of impurities are extracted from an extraction port of the dividing wall column; the device consists of a dividing wall column and comprises a pre-separation area, an extraction area, a rectifying section and a stripping section, according to the method, the process safety and the added value are improved; the MDP yield is improved, the separation effect is better, impurities are separated more cleanly, and the stability of a reaction system is improved in the circulating process; the dividing wall column is adopted, multi-component separation is achieved, system energy consumption is further reduced, and the method is suitable for large-scale industrial production and is efficient and environmentally friendly.

The application relates to the technical field of compound synthesis, in particular to a preparation method of antioxidant 168 and application thereof; the preparation method of the antioxidant 168 comprises the following steps: (1) a reaction kettle is filled with 2,4-di-tert-butyl phenol, a first organic solvent and a solid alkali catalyst to form a first mixed material, then a second mixed solution containing phosphorus trichloride and a second solvent is added into the first mixed material under the condition of 30-40 DEG C to carry out a first reaction, first product flow and HCl gas are obtained; (2) the first product flow is subjected to adsorption treatment through a solid alkali catalyst bed to obtain product flow containing antioxidant 168; (3) the product flow containing antioxidant 168 is subjected to desolubilization, crystallization, filtration and drying to obtain the antioxidant 168. The preparation method has simple post-treatment, reduces the treatment steps of process wastewater, has better industrial practicability, and the prepared antioxidant 168 has high purity and low acid value.

The application provides a highly fluorinated flame-retardant electrolyte additive, a preparation method, a highly fluorinated flame-retardant electrolyte and application thereof in lithium batteries, and the preparation method comprises the following steps: dissolving phosphorus trichloride in a solvent and cooling to 0-5 DEG C, then adding tert-butyl alcohol and stirring, then adding trifluoroalcohol and reacting to obtain intermediate product A; then, under a nitrogen atmosphere, adding the intermediate product A into a tert-butyl alcohol potassium solution in anhydrous dimethyl sulfoxide and reacting to obtain intermediate product B; finally, under a nitrogen atmosphere, adding dichloroalkane into the intermediate product B and reacting and purifying to obtain the highly fluorinated flame-retardant electrolyte additive. The flame-retardant electrolyte additive has good compatibility with lithium salt and organic solvent, and has high contents of fluorine and phosphorus flame-retardant elements. The additive can be used together with lithium salt and organic solvent to construct a flame-retardant electrolyte for lithium batteries, and can effectively reduce the flammability of the electrolyte and enhance the safety performance without sacrificing the efficiency and performance of the electrolyte.

This invention relates to the field of water pollution control technology, specifically to a deep purification device and method for phosphorus trichloride production wastewater. It includes a sedimentation tank body, which is square and has an inlet pipe with an inlet valve at its bottom. In this invention, after chemical sedimentation within the sedimentation tank, a lifting adsorption mechanism is used to precisely position a liftable activated carbon layer at the interface between the clear liquid and the sedimentation layer after adsorbing suspended solids in the upper layer of clear liquid, forming a physical isolation barrier. Then, air flotation is used for secondary purification of the upper clear liquid. The activated carbon layer not only prevents the sediment from being disturbed and floating during the subsequent air flotation process but also provides a stable purification zone for the upper air flotation component. Simultaneously, the air flotation generating pipe is arranged above the activated carbon layer to avoid direct impact of air bubbles on the activated carbon layer, ensuring the structural integrity and durability of the adsorption layer. Thus, chemical sedimentation, activated carbon adsorption, and air flotation separation are achieved in a single sedimentation tank.

The invention discloses a membrane reaction system for preparing phosphorus oxychloride, and belongs to the technical field of chemical processes. The system comprises a phosphorus trichloride tank, an oxygen tank, at least one membrane reactor, a heat exchanger and a finished product tank, at least one group of membrane elements and heat exchange elements are arranged in the membrane reactor, each membrane element is composed of an active layer and a supporting layer, oxygen penetrates through the membrane elements in a molecular state to be in contact reaction with phosphorus trichloride on the surface of the membrane, and the heat exchange elements are used for timely removing reaction heat. The gas-liquid contact area and the mass transfer efficiency are greatly improved through membrane type mass transfer, and efficient dispersion and utilization of oxygen are achieved; the system supports multi-stage series continuous production, is accurate and controllable in reaction temperature, and has the advantages of high production efficiency, low energy consumption, safety in operation, high product purity and the like.

The present application relates to a continuous production system and method of phosphorus oxychloride, wherein raw material phosphorus trichloride and oxygen are continuously metered into a reactor for oxidation reaction, and the reaction liquid material composition is stabilized by controlling the reaction temperature and pressure, a jet cyclone pressure stabilizing condenser and a pressure stabilizing tank are used to completely react and continuously meter out the trace oxygen released by the reaction liquid pressure release, after distillation separation, the light and heavy components are continuously metered out from the top and bottom of the distillation column, wherein the lighter components control the liquid level in the distillation column by adjusting the reflux ratio of the reflux ratio controller, at the same time, the unreacted phosphorus trichloride raw material is recovered into the phosphorus trichloride receiving tank, and the heavier phosphorus oxychloride product component at the bottom is output from the product output pipeline at the lower side of the reboiler. The present application couples the oxidation reaction of phosphorus trichloride and oxygen and distillation, realizes the continuous production operation of phosphorus oxychloride, improves the production efficiency and capacity, and reduces the energy consumption.