46 results about "Dimethyl phosphonate" patented technology

The invention discloses a preparation method of a fluorine-containing carbazole phosphonic acid compound, which solves the technical problems of harsh reaction conditions, high raw material price and low yield in the existing preparation process, 4-trifluoromethoxyaniline and 4-trifluoromethoxyiodobenzene are used as initial raw materials, and Ullmann reaction is performed under a solvent-free condition to obtain 4, 4 '-difluorocarbazole phosphonic acid. The preparation method comprises the following steps: taking 3, 4 '-bis (trifluoromethoxy) diphenylamine as a raw material, carrying out palladium acetate catalytic oxidation cyclization to obtain 3, 6-bis (trifluoromethoxy) carbazole, reacting the 3, 6-bis (trifluoromethoxy) carbazole with 2-bromoethyl dimethyl phosphonate to obtain N-(2-ethyl dimethyl phosphonate) 3, 6-bis (trifluoromethoxy) carbazole, and finally hydrolyzing to obtain the N-(2-ethyl phosphonate) 3, 6-bis (trifluoromethoxy) carbazole. The reaction process is simpler to operate, the yield is guaranteed, and the method is suitable for large-scale production. In the preparation method disclosed by the invention, a solvent is not required to be used in multiple steps, the reaction is performed under a solvent-free condition, and the preparation method is high in safety and environment-friendly.

The invention discloses a preparation method of an intrinsically flame-retardant and toughened polystyrene copolymer. The preparation method comprises the following steps: firstly, preparing a phosphorus-nitrogen integrated functional compound from glycine, paraformaldehyde and dimethyl phosphite as raw materials; then carrying out acylating chlorination modification on the phosphorus-nitrogen integrated functional compound by using thionyl chloride; reacting the phosphorus-nitrogen integrated functional compound modified by acylating chlorination with phenolic hydroxyl cardanol to prepare a high-flexibility flame-retardant monomer; and finally, reacting the high-flexibility flame-retardant monomer with styrene to obtain the polystyrene copolymer. The copolymer has the dual advantages of flame retardance and toughening at the same time.

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 invention belongs to the technical field of chemical engineering, and discloses a cooling agent N, 2, 3-trimethyl-2-isopropyl butyramide and a synthesis method and application thereof, and the synthesis method comprises the following steps: adding propionitrile and isopropyl bromide into a reaction kettle, and reacting under the low-temperature liquid ammonia condition of-30-50 DEG C to obtain an intermediate DIPPN; carrying out purification and distillation on the intermediate DIPPN; reacting the purified and distilled intermediate DIPPN with dimethyl polyphosphate at the temperature of 100-140 DEG C, neutralizing with acid, separating, and filtering to obtain a crude product; the crude product is crystallized and dried, and the cooling agent N, 2, 3-trimethyl-2-isopropyl butyramide is obtained; the problem of low yield in the prior art is solved, and the problem of high acid value of amidation of methanol and concentrated sulfuric acid as a catalyst in the prior art is also solved.

The invention belongs to the field of pesticide preparation, and particularly relates to an improved preparation method of 2-(2 '-bromomethyl phenyl)-2-carbonyl methyl acetate. 2-oxo-2-(o-tolyl) ethyl acetate is used as a raw material and is sequentially subjected to oximation reaction, structure transposition treatment, bromination reaction and polybrominated substance to monobromination reaction, and finally 2-(2 '-bromomethyl phenyl)-2-carbonyl methyl acetate is obtained. Wherein the structure transposition treatment comprises the following steps: by taking an oximation product as a substrate, introducing a catalyst under a system anhydrous condition to realize conversion from a Z configuration to an E configuration; the polybrominated substance to monobrominated product conversion reaction comprises the following steps: dissolving a brominated product in THF, then adding dimethyl phosphite and diisopropylethylamine, and carrying out a reaction to realize conversion of the polybrominated substance into a monobrominated product. According to the method, the conversion of polybrominated substance impurities into monobrominated products is optimized through process improvement, so that the yield of the target product is improved, and the method is simple to operate, few in by-products and suitable for industrial production.

The invention discloses a method for detecting specific pollutants in a pesticide production plot, which can simultaneously detect six specific pollutants including three organophosphorus pesticides including isocarbophos, isofenphos-methyl and profenofos. One pesticide degradation product is dimethyl phosphate; the intermediate product of one pesticide is dimethyl phosphite, and the production raw material of the other pesticide is dimethyl sulfate. The method comprises the following steps: carrying out freeze-drying and grinding on a soil sample, and sieving with a sieve with the aperture of 0.25 mm; uniformly stirring the soil sample and diatomite, and adding a substitute and an extracting agent for extraction treatment to obtain a sample extracting solution; carrying out dehydration treatment on the sample extracting solution; and performing concentration treatment on the sample extracting solution to obtain a to-be-detected sample solution containing six target objects. The method can be used for simultaneously detecting specific pollutants of 6 pesticide production plots, and the detection rate is high; by adding an interior label, the accuracy of the method is improved; and the qualification rate of sample detection is improved by adding a substitute.

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 discloses a dimethyl phosphite rectifying device which comprises a rectifying still, a rectifying tower, a condensing device and a distributor, wherein the rectifying still is provided with a dual-heating structure, the top of the rectifying still is connected with a crude ester feeding pipeline, the bottom of the rectifying still is connected with a residual liquid tank, and the upper part of the rectifying still is connected with the rectifying tower through a first gas phase pipeline; the top of the rectifying tower is connected with a condensing device through a second gas phase pipeline, a condensate extraction pipeline is connected below the condensing device and connected with a distributor, the distributor is connected with a backflow pipeline and a refined ester extraction pipeline, the backflow pipeline is connected with a rectifying tower body, and the refined ester extraction pipeline is connected with a transfer tank. The transfer tank is connected with a vacuum device and a finished product tank, and a refined ester content analysis device is arranged on the refined ester extraction pipeline; in general, the rectification device has the advantages of high rectification efficiency, good finished product quality, convenience in remote control and analysis, safety and convenience.

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 invention discloses a preparation method of a high-flexibility flame-retardant monomer. The preparation method comprises the following steps: firstly, preparing a phosphorus-nitrogen integrated functional compound by taking glycine, paraformaldehyde and dimethyl phosphite as raw materials; then carrying out acylating chlorination modification on the phosphorus-nitrogen integrated functional compound by using thionyl chloride; and reacting the phosphorus-nitrogen integrated functional compound modified by acylating chlorination with phenolic hydroxyl cardanol to prepare the high-flexibility flame-retardant monomer. The flame-retardant monomer has good flexibility, the reaction process is simple, operation is convenient and safe, popularization and application are easy, and the flame-retardant monomer has good industrial application value.

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 relates to application of a trifluoromethyl pyrazolyl dimethyl phosphonate isomer compound in an electrolyte, an electrolyte additive and a lithium ion battery electrolyte, relates to the technical field of lithium ion batteries, and provides application of the trifluoromethyl pyrazolyl dimethyl phosphonate isomer compound in the electrolyte. And the lithium ion battery has a wide application prospect in the field of lithium ion batteries, and makes up for the defects in the prior art.

In order to reduce the use amount of raw material methanol, improve the atom utilization rate and reduce byproduct chloromethane and the like, the invention discloses a process, a system and a control system for efficiently preparing dimethyl phosphite, and belongs to the technical field of synthesis of intermediate dimethyl phosphite of pesticide glyphosate. Wherein water and methanol are jointly used as raw materials (one molecule of water is used for replacing one molecule of methanol), the use amount of methanol is reduced, meanwhile, the byproduct chloromethane is greatly reduced, and the atom utilization rate is increased; a continuous flow reactor, a gas-liquid separator and the like are adopted, so that the whole reaction system is in a state from normal pressure to micro-positive pressure, the negative pressure state of a traditional kettle type continuous reactor is replaced, the reaction system does not need to use a vacuum pump, and the power consumption is greatly reduced; in addition, by controlling temperature, pressure, flow and the like, continuity, orderliness and controllability of the preparation process are guaranteed.

The invention discloses a preparation method of an intrinsic flame-retardant high-elasticity styrene-acrylic emulsion. The preparation method comprises the following steps: firstly, preparing a phosphorus-nitrogen integrated functional compound by taking glycine, paraformaldehyde and dimethyl phosphite as raw materials; then carrying out acylating chlorination modification on the phosphorus-nitrogen integrated functional compound by using thionyl chloride; reacting the phosphorus-nitrogen integrated functional compound modified by acylating chlorination with phenolic hydroxyl cardanol to prepare a high-flexibility flame-retardant monomer; and finally, reacting a high-flexibility flame-retardant monomer, styrene, butyl acrylate and acrylic acid in the cationic etherified starch aqueous solution to prepare the flame-retardant high-elasticity styrene-acrylic emulsion. The emulsion has multiple advantages of flame retardance, high elasticity, no soap, water resistance and the like, is green and environment-friendly, is low in cost and has wide application value.

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 invention discloses an aqueous battery electrolyte as well as preparation and application thereof. The aqueous battery electrolyte comprises a solute, dimethyl phosphate and water, the solute is sodium salt or lithium salt, and the volume ratio of water to dimethyl phosphate is (0.1-3): (7-10). The preparation method comprises the following steps: uniformly mixing dimethyl phosphate with water to obtain a solution A; adding a solute into the solution A, and dissolving to obtain a solution B; and adjusting the pH value of the solution B to be neutral to obtain the aqueous battery electrolyte. The aqueous battery electrolyte prepared by the invention can be used for preparing aqueous lithium and sodium ion batteries. According to the invention, the electrochemical stability window of the pure water system electrolyte is effectively widened, the stable voltage window can reach 3V, and the decomposition of deionized water in the electrolyte is relieved; the aqueous electrolyte is simple in preparation method, low in price, good in safety and easy for industrial large-scale production; the aqueous battery adopting the electrolyte is long in cycle life and excellent in performance.

The invention discloses a synthesis process of a glyphosate active compound, which belongs to the technical field of glyphosate synthesis, and comprises the following steps: adding paraformaldehyde and methanol into a synthesis kettle, uniformly stirring and mixing, adding a catalyst I, and carrying out depolymerization reaction; after the depolymerization reaction is finished, adding a catalyst II, preserving heat, fully stirring, and then adding glycine for addition reaction; after the reaction is completed, adding dimethyl phosphite to carry out condensation reaction; after the reaction is finished, pumping into a hydrolysis kettle, dropwise adding hydrochloric acid, heating with steam to evaporate methanol and methylal, then carrying out reflux reaction, evaporating hydrogen chloride under reduced pressure, and then adding water into the kettle; and finally, putting the material in the hydrolysis kettle into a crystallization kettle, cooling, standing, filtering and drying to obtain solid glyphosate. The introduced catalyst not only has a very good catalytic effect, improves the yield of a glyphosate active compound, shortens the glyphosate synthesis time and improves the production efficiency, but also can prevent the formation of glyphosine impurities and other impurities, improves the economic benefits, and is energy-saving and environment-friendly.

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 relates to a continuous production process and device for dimethyl phosphite. The process comprises the following steps: (1) adding a backing material into a primary deacidification kettle; (2) connecting the bottom of the primary deacidification kettle into an inlet of a circulating pump, feeding methanol into the circulating flow reactor from an outlet of the circulating pump, and feeding phosphorus trichloride into the circulating flow reactor from an inlet of the circulating flow reactor; (3) a reaction product generated in the step (2) sequentially enters a first-stage deacidification kettle and a second-stage deacidification kettle; (4) carrying out two-stage deacidification to obtain dimethyl phosphite; wherein in the step (1), the base material is methanol and / or crude dimethyl phosphite. The circulating flow reactor is adopted, phosphorus trichloride is added from an inlet of the circulating flow reactor in proportion and rapidly reacts with methanol through the micro distributor, the production efficiency can be effectively improved, and the reaction is controlled to be carried out in a milder mode.

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.