32 results about "Dimethyl phosphonate" patented technology

The invention belongs to the field of flame-retardant thermal insulation materials, and particularly relates to flame-retardant silicone rubber and a production process thereof. The flame-retardant silicone rubber comprises the following formula components: methyl vinyl silicone rubber, fluorinated silicone rubber, a compound flame retardant, a filler, a silane coupling agent, an antioxidant, a lubricant and a vulcanizing agent, the compound flame retardant is prepared from a carbon nano tube, nano silicon dioxide and a nitrogen-phosphorus complexing agent according to the mass ratio of (4 to 7) to (11 to 13) to (16 to 19). The preparation method comprises the following steps: reacting dimethyl phosphate with methacrylamide to obtain an intermediate, then adding trimethylolpropane, reacting to obtain a nitrogen-phosphorus complexing agent of which the molecular structure simultaneously contains a phosphate group and hydroxymethyl, and preparing nano silicon dioxide with a porous network by taking tetraethoxysilane and methyltrimethoxysilane as silicon sources. The carbon nano tube, the nano silicon dioxide and the nitrogen-phosphorus complexing agent jointly form a compound flame retardant, and the compound flame retardant is added into the flame-retardant silicone rubber, so that the heat insulation property and the flame retardance of the flame-retardant silicone rubber are effectively improved.

The application discloses a platinum complex with controllable activity and a preparation method and application thereof, which is formed by coordination of vinyl siloxane, modified ligand and chloroplatinic acid; the modified ligand is prepared by reaction of maleic anhydride, allylamine and hydroxymethyl dimethyl phosphite. The application introduces amide groups and phosphite groups into the molecular chain of maleic anhydride, uses the groups as coordination compounds to coordinate with vinyl siloxane and platinum, and can improve the normal-temperature storage stability of the platinum catalyst while still keeping high catalytic activity of the platinum catalyst on the hydrosilylation reaction; when the platinum complex is used for catalyzing preparation of addition-type liquid silicone rubber, no inhibitor needs to be added, and the silicone rubber has good mechanical properties.

The invention belongs to the technical field of electrochemical energy storage, and provides a manufacturing method of an electrolytic zinc-manganese aqueous secondary large battery, which comprises a method for preparing a manganese dioxide (MnO2) positive electrode through in-situ electrochemical deposition; according to the electrolytic MnO2-Zn battery based on the Mn < 2 + > / MnO2 chemistry, higher theoretical capacity, high discharge voltage and good cycle stability are achieved, the hydroxymethyl dimethyl phosphite is adopted as an electrolyte additive, the hydrogen evolution reaction and dendritic crystal growth of a zinc negative electrode are effectively inhibited, and the service life of the battery is prolonged. The chemical reaction kinetics of an electrode-electrolyte interface is also improved, so that the cycle life and the safety of the battery are greatly improved, and meanwhile, the manganese-based positive electrode material is structurally modified, so that the problems of unstable structure and insufficient conductivity of the positive electrode material in long-term circulation are solved; therefore, the battery can still maintain a stable voltage platform and a relatively high capacity retention ratio after 3000 times of charge-discharge cycles, and the service life of the battery is remarkably prolonged.

Provided is a modified cellulose, a preparation method and application thereof. The modified cellulose includes a flame retardant cellulose ester film, and the preparation method includes: obtaining a homogeneous cellulose solution by adding a cellulose to an ionic liquid cosolvent system; obtaining a cellulose phosphite ester solution by adding dimethyl phosphite and a catalyst to the homogeneous cellulose solution for performing a transesterification; obtaining cellulose phosphite ester powder by regeneration solvent precipitation, washing, centrifugation, and drying of the cellulose phosphite ester solution; and obtaining the flame retardant cellulose ester film by evaporating solvent after dissolving the cellulose phosphite ester powder in dimethyl sulfoxide.

The utility model discloses a dimethyl phosphite reaction device, which comprises an esterification kettle, a phosphorus trichloride feed pipe and a methanol feed pipe are inserted into the esterification kettle and are connected with a nozzle of a hedging reaction area, and a bottom discharge port of the hedging reaction area is connected with a mixed reaction area. The device has the beneficial effects that (1) two raw materials can be fully contacted through atomizing and spraying, so that the yield of dimethyl phosphite reaches more than 96%; (2) chloromethane gas and other gas phases can be separated from dimethyl phosphite through a gas-liquid separator, so that the generation of monomethyl phosphite and phosphorous acid is reduced; (3) a mixing element is arranged in the mixing reaction area, so that phosphorus trichloride which is not completely reacted can be rapidly mixed and reacted, and gas is discharged from an exhaust hole; (4) the method has the advantages that the materials can fully react, tail gas is quickly separated, and the esterification vacuum degree requirement can be reduced from-0.09 Mpa to-0.05 Mpa; and (5) the total retention time of the materials is short, backmixing is avoided, the total amount of reaction liquid held in unit time is small, and the safety is good.

This invention provides a method for preparing high-purity olaparib, belonging to the field of pharmaceutical synthesis technology. The method uses dimethyl (3-oxo-1,3-dihydroisobenzofuran-1-yl)phosphate as the starting material, reacting it with compound 2 via a Wittig reaction to generate compound 3. Compound 3 reacts with hydrazine hydrate to generate compound 4. Compound 4 is hydrolyzed and acidified to give compound 5. Compound 5 reacts with thionyl chloride to give compound 6. Compound 6 is then condensed with compounds 7 and 9 to obtain olaparib. This invention uses readily available raw materials, is simple to operate and process, has mild reaction conditions, achieves a total yield of up to 90%, a purity >99%, is environmentally friendly, and is suitable for industrial production.

The invention discloses a composite dispersing agent for positive electrode lithium supplementation, a lithium ion battery and preparation and formation methods of the lithium ion battery, the composite dispersing agent contains an auxiliary dispersing agent, and the auxiliary dispersing agent is prepared by carrying out amino-alkylene addition reaction on amino, allyl dimethyl phosphate and lithium acrylate. The functional polymer containing the phosphate ester and the lithium complex is obtained; the lithium ion battery provided by the invention comprises a composite dispersing agent for supplementing lithium to a positive electrode, the formation method disclosed by the invention comprises the following steps: performing liquid injection and standing on the lithium ion battery for 12-96 hours, and then performing formation treatment on the lithium ion battery at a preset magnetic field intensity. The preparation method has the beneficial effects that the dispersing aid promotes uniform dispersion of positive electrode material particles, the prepared lithium ion battery is treated by a formation method of external magnetic field intensity, the discharge capacity, cycle life, charge-discharge efficiency and other electrochemical performance indexes of the battery are remarkably improved, the current density can be improved, the formation time can be remarkably shortened, and the production cost is reduced. The production efficiency is improved.

The utility model provides a continuous automatic temperature control device for a dimethyl phosphite deacidification process, which comprises a primary deacidification kettle connected with a secondary deacidification kettle through a discharge pipeline. The secondary deacidification kettle is connected with a crude ester receiver I and a crude ester receiver II through a discharging pipeline; a jacket is arranged on the outer side of the first-stage deacidification kettle and is connected with a steam header pipe; and a jacket is arranged on the outer side of the secondary deacidification kettle and is connected with the hot water collecting tank. The first-stage deacidification kettle is provided with a temperature monitoring device, a steam outlet pipeline connected with the bottom of the jacket is provided with a steam stop valve and a drain valve and is connected with the jacket on the outer side of the second-stage deacidification kettle, and the steam stop valve and the drain valve are interlocked with the temperature monitoring device of the second-stage deacidification kettle.

The invention discloses a nanoparticle modified antibacterial packaging film and a preparation method thereof, and relates to the technical field of packaging materials. When the nano particle modified antibacterial packaging film is prepared, nano graphene sequentially reacts with 2-(2-chloroethyl) furan and 1, 2-benzisothiazole-3-ketone, and modified nano graphene is prepared; the preparation method comprises the following steps: reacting barbaloin with 2-chloro-4, 6-bis (oxyalkan-2-yl methoxy)-1, 3, 5-triazine to obtain functionalized barbaloin; the preparation method comprises the following steps: sequentially reacting linear low-density polyethylene with dimethyl allyl phosphate and 3-mercapto-1-propanol to prepare modified polyethylene; uniformly mixing the modified polyethylene, the functionalized barbaloin and the modified nano graphene, and carrying out tape casting to obtain a polyethylene film material; and coating the fluorine-containing coating liquid on the surface of a polyethylene film material to prepare the nano particle modified antibacterial packaging film. The nano particle modified antibacterial packaging film prepared by the invention has excellent antibacterial, flame-retardant, water vapor barrier and mechanical properties.

The application discloses modified cotton fabric and a preparation method and application thereof, and relates to the field of textile fabrics.In the preparation of the modified cotton fabric, chitosan is pretreated by 2-bromoisobutyryl bromide, then acrylic acid and methyl acrylate are grafted and polymerized by an atom transfer radical polymerization method to obtain pre-modified chitosan, then the pre-modified chitosan is sequentially reacted with oxalyl chloride and 4-hydroxybenzotriazole to prepare modified chitosan; cotton fabric is ultrasonically pretreated by a sodium dodecyl sulfate solution, then sequentially reacts with 6-chlorohexanoyl chloride and N,N-dimethylallylamine to prepare pre-modified cotton fabric, and finally, the pre-modified cotton fabric is reacted with a modified liquid prepared from modified chitosan, dimethyl phosphite and 1,4-butanediol to prepare the modified cotton fabric.The modified cotton fabric prepared by the application has excellent ultraviolet resistance, antibacterial property, wrinkle resistance and flame retardance.

The invention provides organic aluminum phosphite as well as a preparation method and application thereof, and the preparation method comprises the following steps: (1) hydrolyzing organic phosphite ester serving as a raw material under an acidic condition to obtain organic phosphorous acid; and (2) mixing the organic phosphorous acid prepared in the step (1) with an aluminum-containing compound, reacting at 100-200 DEG C under an acidic condition and a water medium, and then performing post-treatment to obtain the organic aluminum phosphite, the organic phosphite ester is dimethyl methylphosphate; the preparation method of the dimethyl methylphosphate comprises the following steps: under the protection of inert gas, mixing and stirring trimethyl phosphite serving as a raw material and a phenyl sulfonic acid catalyst, and carrying out rearrangement reaction in a pressurizing and heating manner, so as to synthesize the target product dimethyl methylphosphate. The organic aluminum phosphite provided by the invention has excellent thermal stability, and the initial decomposition temperature is not lower than 360 DEG C; the compound can be used as a flame-retardant synergist, and can be compounded with a flame retardant to be used as a flame-retardant system of a high polymer material.

The invention relates to the technical field of chemical fertilizer anti-caking agents, and discloses an attapulgite-based chemical fertilizer anti-caking agent and a preparation method thereof.The preparation method specifically comprises the steps that urea, dimethyl phosphite, a formaldehyde aqueous solution, itaconic acid and tripotassium citrate serve as raw materials, and a Mannich reaction, a dehydration reaction and an esterification reaction are conducted in sequence to prepare an alkenyl nitrogen phosphorus potassium compound nutrition component; the preparation method comprises the following steps: carrying out ring-opening reaction on hydroxyl groups on the surface of attapulgite and epoxy groups in allyl glycidyl ether to prepare alkenylated attapulgite; the preparation method comprises the following steps: by taking alkenylated attapulgite and an alkenylated nitrogen-phosphorus-potassium compound nutrient component as main raw materials and N, N-methylenebisacrylamide as a cross-linking agent, preparing functionalized attapulgite by adopting a solution polymerization method under the action of an initiator; functionalized attapulgite and fatty alcohol-polyoxyethylene ether are used as raw materials and are mixed, ground and sieved to prepare the chemical fertilizer anti-caking agent. The fertilizer prepared by adding the chemical fertilizer anti-caking agent prepared by the invention shows excellent anti-caking performance.

The application discloses a method for removing half ester in bisphenol A bis(diphenyl phosphate), relates to the technical field of organic synthesis, and has the following steps: mixing bisphenol A bis(diphenyl phosphate) material containing half ester with a methylating agent in the presence of a Lewis acid catalyst to make P-OH groups in the half ester undergo a methylation reaction, wherein the methylating agent is selected from one or more of dimethyl phosphate, dimethyl carbonate and dimethyl sulfate; and performing vacuum distillation on the reaction material after the reaction is completed to remove unreacted methylating agent and by-products, and further performing solvent dissolution, acid washing, alkali washing, water washing and desolvent treatment. The method has the beneficial effects that the half ester impurities containing acidic P-OH groups are converted into corresponding phosphate esters through the methylation reaction, and the half ester content and acid value in the BDP product are reduced.

The utility model discloses a control system for preparing dimethyl phosphite. The control system comprises a DCS (Distributed Control System) controller, a phosphorus trichloride flowmeter and a phosphorus trichloride regulating valve which are arranged on a phosphorus trichloride inlet pipe, a water flowmeter and a water regulating valve which are arranged on a water inlet pipe, a methanol flowmeter and a methanol regulating valve which are arranged on a methanol inlet pipe, and a liquid level meter and a pressure transmitter which are arranged on a gas-liquid separator; the pressure regulating valve is arranged on the gas phase outlet pipe, the lower liquid regulating valve is arranged on the lower liquid pipe I, the motor is connected with the distributor, and the temperature sensor II is arranged on the jacket; the phosphorus trichloride flow meter, the phosphorus trichloride adjusting valve, the water flow meter, the water adjusting valve, the methanol flow meter, the methanol adjusting valve, the liquid level meter, the liquid discharging adjusting valve, the pressure transmitter, the pressure adjusting valve, the motor and the temperature sensor II are all connected with the DCS controller. The automation of the dimethyl phosphite preparation process is realized, and the stability, controllability and traceability of the dimethyl phosphite preparation process are ensured.

The invention discloses a method for recycling glyphosate technical from glyphosate mother liquor. The method comprises the following steps: S01, absorbing hydrochloric acid tail gas generated in the production process of dimethyl phosphite by taking the glyphosate mother liquor as an absorbent; s02, fully mixing the glyphosate mother liquor absorbing the hydrochloric acid tail gas with hydrochloric acid, and storing for later use; s03, fully mixing the mixed solution stored for later use with the condensation solution, then stirring and controlling the temperature at 30-40 DEG C; s04, carrying out heating hydrolysis on the temperature-controlled mixed solution, and ensuring that the mass concentration of sodium chloride salt in hydrolysate is 5-8% after the hydrolysis reaction is finished; and S05, then carrying out cooling crystallization, and when the temperature is lower than 40 DEG C, separating the glyphosate mother liquor to obtain a glyphosate raw medicine wet product. According to the method, the glyphosate dissolved in the glyphosate mother liquor can be effectively recovered, and the yield of the glyphosate is increased.

The utility model discloses a deacidification device for producing dimethyl phosphite. The deacidification device comprises a deacidification kettle, a condensing device and an analysis and determination device, a servo variable frequency motor, a feeding port, a backflow port, a vacuum port, an on-line thermometer, an on-line vacuum meter, a radar liquid level meter, a searchlight and a sight glass are arranged on a kettle cover of the deacidification kettle, the on-line liquid level meter, a circulating water interlayer, a stirrer and a discharging port are arranged on a kettle body, and the feeding port and the discharging port are communicated with a feeding pipeline and a discharging pipeline through an on-line flowmeter and an electromagnetic valve respectively. The vacuum port communicates with a vacuum pipeline; the condensing device is arranged above the deacidification kettle and comprises two condensers which are connected in series, one condenser is connected with a vacuum pipeline, the other condenser is used for discharging condensed gas, and a condensate outlet is connected with the reflux inlet; the analyzing and measuring device comprises a crude ester content acidity measuring device A mounted on the feeding pipeline and a crude ester content acidity measuring device B mounted on the kettle cover; the device disclosed by the utility model has the advantages of high working efficiency, low product acidity, high production yield and high automation degree.

The invention discloses a foam foaming material special for an automobile headrest and a preparation method of the foam foaming material, and relates to the technical field of automobile part manufacturing, the foam foaming material comprises a component A and a component B. The component B comprises three formulas B1, B2 and B3 of different catalytic systems; the component A is polyphenyl polymethylene polyisocyanate, the functionality of the component A is 2.6-2.8, and the mass content of NCO is 30%-32%; the basic formula of the component B comprises the following components in parts by weight: 40-60 parts of polyether polyol with the functionality of 3 and the hydroxyl value of 450-500 mg KOH / g; the solid content of the polymer polyether polyol is 40-45%: 20-40 parts; 1 to 3 parts of a crosslinking agent diethanol amine; 1.5 to 3.5 parts of foaming agent water; 1-2 parts of a silicone oil surfactant; 5 to 15 parts of a flame retardant dimethyl methylphosphate; 0.5 to 1.5 parts of an anti-aging agent; by adopting the formula of the component B with three different catalytic systems and combining with a partitioned material injection technology, a gradient hardness structure of a main supporting area, a comfortable fitting area and an edge transition area can be accurately formed in the automobile headrest foam.

The application discloses a preparation method of an intrinsically flame-retardant high-elasticity styrene-acrylic emulsion, which comprises the following steps: preparing a phosphorus-nitrogen integrated functional compound by using glycine, polyformaldehyde and dimethyl phosphite as raw materials; performing acyl chloride modification on the phosphorus-nitrogen integrated functional compound by using sulfoxide chloride; preparing a high-flexibility flame-retardant monomer by reacting the acyl chloride modified phosphorus-nitrogen integrated functional compound with a phenolic hydroxyl cashew phenol; and finally preparing the flame-retardant high-elasticity styrene-acrylic emulsion by reacting the high-flexibility flame-retardant monomer, styrene, butyl acrylate and acrylic acid in a cationic etherified starch aqueous solution. The emulsion has the multiple advantages of flame retardation, high elasticity, soap-free, water resistance and the like, is green and environment-friendly, low in cost, and has a wide application value.

The present application relates to a method for preparing glyphosate spherical crystal, and belongs to the technical field of pesticide production. The steps include: taking the glyphosate synthesis solution obtained by the glycine-phosphite dimethyl ester method as a raw material, adding concentrated hydrochloric acid with a molar ratio of 2-5 to glycine and a concentration of 30% or more to the glyphosate synthesis solution for acidolysis; heating the acidolysis solution to 95-125 DEG C and keeping it for 0.5-2 hours for dealcoholization; after dealcoholization, the temperature of the system is reduced to 50-80 DEG C within 1-2 hours, and an alkali solution with a mass concentration of 35-42% is added while reducing the temperature, the pH of the system is controlled to be 0.5-3.5, and the stirring speed is kept at 180-250 rpm; then the temperature of the material is reduced to 20-40 DEG C within 1-2 hours, and the glyphosate spherical crystal product is obtained after filtration and washing. The spherical glyphosate obtained by the present application has good flowability, is not easy to agglomerate, has a larger tap density, and is easy to store and transport.

The utility model discloses a low-energy-consumption system for synthesizing dimethyl phosphite, and belongs to the technical field of dimethyl phosphite synthesis. The low-energy-consumption system comprises a micro-channel reactor, a gas-liquid separation device, a normal-pressure tail gas washing tower and a vacuum deacidification device, the micro-channel reactor is connected with a methanol feeding pipe, and the micro-channel reactor is connected with a phosphorus trichloride feeding pipe; the micro-channel reactor is connected with the gas-liquid separation device, the gas-liquid separation device is connected with the normal-pressure tail gas washing tower, and the gas-liquid separation device is connected with the vacuum deacidification device; the vacuum deacidification device is connected with the vacuum tail gas washing tower; the vacuum deacidification device is connected with the dimethyl phosphite rectification system; a continuous path for synthesizing dimethyl phosphite is formed among the micro-channel reactor, the gas-liquid separation device, the vacuum deacidification device and the dimethyl phosphite rectification system. The low-energy-consumption system not only reduces the energy consumption, but also ensures the high efficiency and continuity of the related synthesis process, and can be well matched with the dimethyl phosphite synthesis process to meet the actual requirements.

The invention discloses a preparation method of waterproof durable fibers, which comprises the following steps: firstly, synthesizing 3, 5-di-tert-butyl-4-hydroxybenzyl methyl methacrylate through esterification reaction, and carrying out melt grafting on the 3, 5-di-tert-butyl-4-hydroxybenzyl methyl methacrylate and polyethylene glycol terephthalate in a twin-screw extruder to prepare antioxidant polyethylene glycol terephthalate; then carrying out polycondensation on p-phenylenediamine, terephthalic acid and cyclobutane tetracarboxylic dianhydride to prepare carboxylated polyamide, and reacting with dimethyl 2-hydroxyethyl phosphonate to obtain flame-retardant polyamide; the preparation method comprises the following steps: mixing antioxidant polyethylene glycol terephthalate, flame-retardant polyamide and graphene at a high speed, and performing melt spinning to obtain composite fibers; carrying out emulsion polymerization on an acrylate monomer and an emulsifier to prepare a waterproof finishing agent; and finally, padding the composite fiber in a waterproof finishing agent solution, and performing segmented baking and curing to obtain the composite fiber with oxidation resistance, flame retardance and lasting waterproof performance, which is suitable for the field of special protective textiles.

The utility model discloses a post-treatment system for dimethyl phosphite reaction liquid, and belongs to the technical field of purification of dimethyl phosphite which is an intermediate of glyphosate. The post-treatment system comprises a deacidification kettle and a packed tower, the deacidification kettle is arranged on the rear side of a gas-liquid separator station in the dimethyl phosphite preparation system, and the gas-liquid separator is connected with the deacidification kettle; a distributor is arranged in the deacidification kettle and is communicated with the gas-liquid separator; the deacidification kettle is connected with the packed tower through an exhaust pipe, and the packed tower is connected with the deacidification kettle; a dimethyl phosphite storage tank is arranged on the rear side of the station of the deacidification kettle, and a liquid discharging pipe of the deacidification kettle extends to the middle or the bottom of the dimethyl phosphite storage tank to ensure that liquid seal is formed. The post-treatment system can be well matched with the preparation process of the dimethyl phosphite, continuous deacidification is achieved, and the yield and quality of the dimethyl phosphite are improved; meanwhile, the method is environment-friendly.

The utility model discloses a negative-pressure treatment device for tail gas generated in dimethyl phosphite production. The negative-pressure treatment device comprises a vacuum part, a condensation part and an absorption treatment part, the vacuum part comprises a buffer tank A, a Roots vacuum pump unit and a buffer tank B, the buffer tank A is provided with a tail gas inlet A, a tail gas outlet A and a methanol collecting tank A, the tail gas outlet A is connected with the Roots vacuum pump unit through a gas inlet pipeline, the Roots vacuum pump unit is connected with the buffer tank B through a gas outlet pipeline, and the top of the buffer tank B is provided with a tail gas outlet B; a methanol collecting tank B is arranged at the bottom of the buffer tank B; the condensing part comprises a condenser and a methanol collecting tank C, the tail gas outlet B is connected with the condenser, and the lower end of the condenser is connected with the methanol collecting tank C; the absorption treatment part comprises a multi-stage water absorption tower and an alkali absorption tower, the condenser is connected with the multi-stage water absorption tower, the multi-stage water absorption tower is connected with the alkali absorption tower, and a tail gas output pipeline is arranged at the top of the alkali absorption tower; the device disclosed by the utility model has the advantages of low production cost, high recycling rate and good chloromethane product quality.

This invention discloses a preparation process for a weather-resistant polyurethane coating material, relating to the field of coating material technology. In preparing the weather-resistant polyurethane coating material, sericite is pretreated and then reacted with cinnamaldehyde to obtain modified sericite; a high-efficiency flame retardant is prepared by reacting 3,5-diamino-1,2,4-triazole sequentially with p-methoxybenzaldehyde and dimethyl phosphite using a one-pot method; polytetrahydrofuran diol, benzoyl diols, and 4,4'-dicyclohexylmethane diisocyanate are polymerized to obtain polyurethane; the polyurethane, high-efficiency flame retardant, and modified sericite are mixed using DMF as a solvent to formulate a polyurethane coating, which is then dried to obtain the polyurethane coating material. The polyurethane coating material prepared by the process provided by this invention possesses the advantages of weather resistance, flame retardancy, and antibacterial properties.

The application discloses a preparation method of an intrinsically flame-retardant and toughened polystyrene copolymer, and comprises the following steps: preparing a phosphorus-nitrogen integrated functional compound by using glycine, polyformaldehyde and dimethyl phosphite as raw materials; performing acyl chloride modification on the phosphorus-nitrogen integrated functional compound by using sulfoxide chloride; preparing a high-flexibility flame-retardant monomer by reacting the acyl chloride modified phosphorus-nitrogen integrated functional compound with a phenolic hydroxyl cardanol; and finally preparing the polystyrene copolymer by reacting the high-flexibility flame-retardant monomer with styrene. The copolymer has both flame-retardant and toughening advantages.

The present invention relates to the field of fine chemical technology, and discloses a deacidification device and method for producing dimethyl phosphite. The deacidification device and method for producing dimethyl phosphite of the present invention include a motor, a gas outlet, a rotating shaft, a steam outlet, a throwing disc, a reaction liquid outlet, a steam inlet, a liquid collecting pipe, a jacket and a reaction liquid inlet, and are characterized in that: the deacidification device is composed of more than two stages of reducing throwing discs, and the diameter of the throwing discs gradually decreases from top to bottom along the deacidification device, and a liquid collecting pipe is arranged on the inner wall surface of the deacidification device above the side of each stage of throwing disc. The deacidification device and method of the present invention adopt multi-stage reducing throwing discs, preventing the channeling flow and dry wall phenomena that occur in the lower half of the deacidification device due to the gradual reduction of the liquid material during the deacidification process, making the liquid film distribution more uniform, improving the hydrogen chloride removal efficiency and the yield and quality of dimethyl phosphite. At the same time, the design that the inner diameter of the deacidification device gradually decreases from top to bottom effectively reduces the steam consumption.

The present invention provides a method for preparing betamethasone sodium phosphate injection, comprising: adding methanesulfonyl chloride and dimethyl phosphate, respectively, into a first chamber; heating to a certain temperature; slowly dripping sodium methanesulfinate into the first chamber; reacting for a period of time; and then adding betamethasone; obtaining the pressures of the first chamber and the second chamber, and determining whether the reaction in the second chamber has reached dissolution equilibrium based on the pressure difference. According to the present invention, by obtaining the pressure difference between the first chamber and the second chamber at the current moment, the solubility at the current moment is obtained using a pressure-solubility model. Based on the solubility at the current moment and the fluctuation range of a preset solubility threshold, the mixing mechanism is adjusted accordingly using the fluctuation range, the solubility, and the mixing efficiency model, so that the reaction process can be precisely controlled and adjusted to improve the quality of the drug.

Provided is a method for preparing a flame retardant cellulose ester film, and the method includes: obtaining a homogeneous cellulose solution by adding a cellulose to an ionic liquid cosolvent system; obtaining a cellulose phosphite ester solution by adding dimethyl phosphite and a catalyst to the homogeneous cellulose solution for performing a transesterification; obtaining cellulose phosphite ester powder by regeneration solvent precipitation, washing, centrifugation, and drying of the cellulose phosphite ester solution; and obtaining the flame retardant cellulose ester film by evaporating solvent after dissolving the cellulose phosphite ester powder in dimethyl sulfoxide.

The invention relates to the technical field of chemical engineering, and particularly discloses a method for improving glyphosate synthesis yield, which comprises the following steps: S1, carrying out depolymerization reaction by taking paraformaldehyde as a raw material, methanol as a solvent and anhydrous triethylamine as a catalyst to prepare a formaldehyde monomer and obtain a depolymerization solution, then adding glycine to carry out addition reaction to prepare N-hydroxymethyl glycine, and carrying out reduced pressure distillation to obtain N-hydroxymethyl glycine; an addition liquid is obtained; s2, carrying out reduced pressure distillation treatment on the addition liquid until the volume of the addition liquid is reduced by 25-45%; and S3, detecting the contents of methanol and triethylamine in the liquid obtained in S2, supplementing anhydrous triethylamine and absolute methanol, dropwise adding dimethyl phosphite, carrying out a reaction, and finally carrying out acidification, crystallization and separation post-treatment to obtain a glyphosate product. According to the method, reduced pressure distillation is introduced after depolymerization and addition, water is efficiently removed by utilizing the multi-element azeotropic characteristic of methanol-water-triethylamine, and meanwhile, a drying reagent is accurately supplemented, so that dual stabilization of the water content of a system and the concentration of a catalyst is realized, and the hydrolysis loss of dimethyl phosphite is reduced.

The invention discloses a resourceful treatment method and a control system for wastewater generated in production of dimethyl phosphite, and relates to the technical field of resourceful utilization of wastewater generated in production of dimethyl phosphite. The method at least comprises one of the following steps: a, carrying out oil-water separation treatment on vacuum pump wastewater generated in a deacidification section in dimethyl phosphite production, and after an oil phase is separated out, treating a gas phase generated in dimethyl phosphite production by using the remaining water phase; and b, using the vacuum pump wastewater generated in a rectification section in dimethyl phosphite production to treat a gas phase generated in dimethyl phosphite production, and meanwhile, providing a system suitable for the method, so that the wastewater treatment cost is remarkably reduced.