34 results about "Dimethyl phosphite" patented technology

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 relates to the technical field of organophosphorus flame retardant synthesis, and particularly discloses an organic polymer catalyst and a method for preparing a cyclic phosphate flame retardant by using the organic polymer catalyst, the organic polymer catalyst contains methyl benzenesulfonate and imidazole ion groups and has bifunctional catalytic sites, imidazole ions can catalyze Michaelis-Arbuzov rearrangement reaction, and the molecular weight of the imidazole ions can be reduced to a certain degree. Methyl benzenesulfonate can catalyze isomerization of dimethyl phosphite, the organic polymer can be recycled through simple treatment after the catalytic reaction is completed, and high catalytic efficiency can still be obtained after the organic polymer is repeatedly used for multiple times.

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.

The invention discloses a perovskite light-emitting diode based on a novel anti-solvent and a preparation method thereof, and belongs to the technical field of light-emitting diodes. The perovskite light-emitting layer is prepared by spin coating of a perovskite precursor solution; an anti-solvent is dropwise added in the spin-coating process; the anti-solvent is a mixture of ethyl acetate doped with dimethyl phosphite (DPP) in a volume ratio of (5: 1)-(40: 1). According to the invention, the selected S-A self-adaptive solvent gives consideration to the unique advantages of an EA anti-solvent and DPP molecules, regulates and controls the growth and orientation of the Q-2D perovskite crystal, and reduces the number of grain boundary defects; the formation of low n phases is inhibited, and the energy transfer efficiency among different n phases is improved; the defects of the Q-2D perovskite are passivated, and the non-radiative recombination loss is reduced. The EQEmax of the prepared PeLEDs reaches 29.27%, and a new view angle is provided for preparation of the high-performance PeLEDs.

The invention relates to the technical field of organic synthesis, in particular to a trichlorfon production device and a trichlorfon production process, the device comprises a first-stage synthesis kettle, a first-stage synthesis kettle condenser, a second-stage synthesis kettle, a second-stage synthesis kettle condenser and a centrifugal machine; a trichloroacetaldehyde feeding hole, a dimethyl phosphite feeding hole and a precipitant feeding hole are formed in the top of the first-stage synthesis kettle, an overflow hole is formed in the upper part of the side wall of the first-stage synthesis kettle, and the top of the first-stage synthesis kettle is connected with a first-stage synthesis kettle condenser through a pipeline; the second-stage synthesis kettle is communicated with an overflow port of the first-stage synthesis kettle through an overflow pipe, and the top of the second-stage synthesis kettle is connected with a second-stage synthesis kettle condenser through a pipeline; and the centrifugal machine is communicated with an overflow port of the second-stage synthesis kettle through an overflow pipe. According to the invention, a continuous synthesis method is adopted, and solid trichlorfon is immediately precipitated and separated out by adding a precipitant; meanwhile, two stages of synthesis kettles are arranged, so that solid trichlorfon is precipitated and separated out more sufficiently while the reaction retention time is ensured, the trichlorfon content is greater than or equal to 98%, and the yield is greater than or equal to 90%.

This invention belongs to the field of inorganic nanoparticle technology, and discloses a silicon-phosphorus-containing inorganic nanoparticle, its preparation method, and its application. The silicon-phosphorus-containing inorganic nanoparticle is prepared from inorganic nanoparticles, a phosphorus-containing compound, and a silane coupling agent. The inorganic nanoparticles are selected from at least one of nano-ZrO2, nano-CaCO3, nano-SiO2, and nano-TiO2. The phosphorus-containing compound is selected from at least one of dimethyl phosphite, diethyl phosphite, and diphenyl phosphite. The silane coupling agent is selected from γ-glycidoxypropyltrimethoxysilane and / or γ-glycidoxypropyltriethoxysilane. The silicon-phosphorus-containing inorganic nanoparticles of this invention, due to surface modification, have significant steric hindrance, are not prone to aggregation, and can be well dispersed in a matrix. The inorganic nanoparticles contain silicon and phosphorus, and have a certain flame-retardant effect.

The present invention relates to the technical field of deacidification, and discloses a deacidification device used in a dimethyl phosphite production process, comprising a kettle body and a perfusion pipe, wherein the perfusion pipe is coaxially mounted on the upper portion of the kettle body. The present invention drives a driving member to move during rotation of a trigger member, and the driving member converts the translation into a driving force required for the rotation of a perfusion head, thereby driving the perfusion head to rotate so as to connect the inner cavities of the perfusion pipe and the injection pipe, so that the dimethyl phosphite entering the perfusion pipe passes through the perfusion head and enters the injection pipe, and then enters an atomizing device through the injection pipe, and the dimethyl phosphite is atomized by the high-speed rotation of the atomizing device. As the trigger member rotates at high speed, the driving member is cyclically squeezed, thereby achieving intermittent driving of the perfusion head to connect the inner cavities of the perfusion pipe and the injection pipe to achieve intermittent material discharge, thereby avoiding the dimethyl phosphite from being introduced too quickly, resulting in the dimethyl phosphite not being atomized in time in the atomizing device and overflowing.

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 utility model provides an automatic cleaning device for a dimethyl phosphite Roots vacuum unit. A clear water pipe (1) and a cleaning agent pipe (2) are connected with a mixing tank (3); the mixing tank (3) is connected with a roots vacuum pump unit (8); the Roots vacuum pump unit (8) comprises a Roots vacuum pump (4), a heat exchanger (5) and a storage tank (6) which are connected in sequence; the mixing tank (3) is connected with the Roots vacuum pump (4); and the tail end of the cleaning agent pipe (4) is inserted into the bottom of the mixing tank (3). The Roots vacuum unit is automatically cleaned in the production process of dimethyl phosphite, and process fluctuation, equipment failure or safety risks possibly caused by manual cleaning are eliminated, so that stable operation of a production device is guaranteed, and the safety risks in production are reduced.

The present application relates to the field of the manufacturing of flame-retardant thin films, in particular to a method for preparing a flame-retardant cellulose ester thin film. Dimethyl phosphite, which acts as a flame-retardant monomer, is subjected to transesterification using 1,8-diazabicycloundec-7-ene as a catalyst in a 1-butyl-3-methylimidazolium chloride / dimethyl sulfoxide cosolvent system to synthesize a phosphite cellulose ester, and then, a phosphite cellulose ester thin film is prepared in dimethyl sulfoxide by means of solvent evaporation. The residual carbon rate of the prepared phosphite cellulose ester thin film is 30.4-33.7%. The operation process is simple, the cellulose solvent used is green and environmentally-friendly, the prepared cellulose ester can be applied to flame-retardant coatings, and the cellulose ester thin film can be applied to packaging materials, so that the problems of flammability, etc. of existing cellulose-based products are solved.

The invention provides a method for reducing moisture of an addition liquid in glyphosate synthesis. The method comprises the following steps: carrying out a depolymerization reaction on paraformaldehyde and a catalyst A in methanol to obtain a depolymerization liquid; adding glycine, methanol and triethylamine into the depolymerization liquid for catalytic reaction to obtain addition liquid; trimethyl phosphite is added into the addition liquid, a hydrolysis reaction is carried out, and water in addition is consumed; after reacting for a period of time, supplementing dimethyl phosphite and triethylamine to obtain a condensation solution; and adding hydrochloric acid into the condensation liquid for acidolysis to remove chloromethane, hydrogen chloride, water or other light components, cooling, adding alkali to adjust pH, crystallizing, filtering and drying to obtain glyphosate. Hydrolyzate dimethyl phosphite and methanol can be applied to the next step of reaction, so that the consumption of dimethyl phosphite and methanol in the condensation reaction is reduced; the side reaction is reduced, the glyphosate yield is increased by 6% compared with that of the prior art, and the glyphosate content reaches 98.5% or above.

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 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.

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 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 invention belongs to the technical field of anion exchange membranes, and relates to a polyaryl piperidine or polyaryl quinine N-methylation reaction method. Dimethyl phosphite is adopted as a methylation reagent, and the method has the advantages of being low in cost, safe and simple in process. The preparation method comprises the following specific steps: (1) synthesizing a polyarylpiperidine / quinine polymer; (2) synthesizing and dispersing the prepared polyaryl piperidine / quinine polymer in an organic solvent, and methylating by taking dimethyl phosphite as a methylation reagent; the polyaryl piperidine quaternization polymer or the polyaryl quinine quaternization polymer is obtained.

The invention relates to the technical field of glyphosate production, and particularly discloses a synthesis method and application of a glyphosate intermediate, and during synthesis of the intermediate, the synthesis method comprises the following steps: S1, taking paraformaldehyde as a raw material, adding triethylamine and methanol, mixing, adding glycine, and heating until a solid is dissolved; s2, mixing the feed liquid obtained in the step S1 with dimethyl phosphite, then adding triethylamine to adjust the pH value, and carrying out heating reaction; s3, cooling the reaction liquid obtained in S2, adding a regulator which is weak acid or strong alkali weak acid salt, uniformly mixing, heating, and removing the solvent under negative pressure; and S4, cooling the feed liquid obtained in S3, adding hydrochloric acid, uniformly mixing, standing, crystallizing, filtering, washing, and drying to obtain the glyphosate intermediate. By synthesizing the intermediate, dynamic monitoring, real-time production guidance, yield improvement and cost reduction in the production process are facilitated.

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 an anti-ultraviolet silk fabric and a preparation method thereof, and relates to the technical field of textile fibers. When the anti-ultraviolet silk fabric is prepared, hydroxylated carbon nanotubes and 3-chloropropyltriethoxysilane are subjected to a reaction, and pre-modified carbon nanotubes are prepared; the pre-modified carbon nano tube and 4-dimethylamino-2, 2, 6, 6-tetramethylpiperidine are subjected to a reaction, and a modified carbon nano tube is prepared; the preparation method comprises the following steps: reacting silk fibroin with 2-(2H-1, 2, 3-benzotriazole-2-yl)-4-hydroxybenzaldehyde to prepare pre-modified silk fibroin; reacting the pre-modified silk fibroin with dimethyl phosphite to obtain modified silk fibroin; preparing a modified silk fibroin solution from the modified silk fibroin, mixing the modified silk fibroin solution with modified carbon nanotubes, and performing wet spinning to obtain modified silk fibers; and weaving the modified silk fibers into the anti-ultraviolet silk fabric. The anti-ultraviolet silk fabric prepared by the invention has good anti-ultraviolet, flame-retardant, antibacterial and mechanical properties.

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.

A fully-continuous flow synthesis method of glyphosate is provided, which is performed by using a fully-continuous system including a plurality of pumps, a micromixer, a plurality of microchannel reactors, a plurality of tubular reactors, two back pressure valves, a plurality of reaction vessels, and a plurality of continuous crystallizers. Paraformaldehyde is depolymerized in the presence of an organic base, and the resultant depolymerization product undergoes an addition reaction with glycine to yield N, N-dihydroxymethylglycine, which further undergoes esterification with dimethyl phosphite (added in two batches) to generate a glyphosate ester. The glyphosate ester is adjusted to be acidic, hydrolyzed, desolvated, neutralized with a base, and purified to obtain glyphosate.

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 invention provides a synthesis method of glyphosate, which comprises the following steps: reacting glycine methyl ester hydrochloride with alkali in an organic solvent, and separating the generated product to obtain glycine methyl ester and salt; the method comprises the following steps: cyclizing glycine methyl ester and a formaldehyde solution under an alkaline condition to generate [1, 3, 5]-triazinane-1, 3, 5-trimethyl triacetate; the preparation method comprises the following steps: carrying out condensation reaction on [1, 3, 5]-triazinane-1, 3, 5-trimethyl triacetate and dimethyl phosphite to obtain a condensation solution; and carrying out acidolysis and crystallization on the condensation liquid to obtain glyphosate crystals. According to the technical scheme, during cyclization reaction, N atoms in glycine methyl ester can react with the same amount of formaldehyde to form a ring, the triazinane intermediate is generated, consumption of formaldehyde is greatly reduced, triethylamine is not introduced as a catalyst in the synthesis route any more, the environmental protection pressure is greatly reduced, and a new thought is provided for the glyphosate synthesis process.

The device sequentially comprises a purification kettle, a mixed liquid pump and a turbid filter from a feeding pipe to a discharging pipe, the top of the purification kettle is provided with the feeding pipe, an adsorption material feeding port and a thermometer port, the purification kettle is internally provided with a stirring assembly, and the lower portion of the purification kettle is provided with a discharging port. The turbid type filter comprises a cylinder body, a liquid inlet, a filter residue outlet, a residual liquid discharge port, a filter element, a liquid collection assembly, an exhaust hole, an instrument port and an air inlet. The related process steps are as follows: S1, preparing an adsorption material; s2, carrying out adsorption treatment on the dimethyl phosphite high-boiling substance; s3, conveying the mixed solution subjected to adsorption treatment into a turbid filter for solid-liquid separation; s4, carrying out post-treatment on the filtered phosphorous acid solution; s5, product detection.According to the method, the content of chloride in solid phosphorous acid can be effectively reduced through the synergistic adsorption effect of diatomite and activated carbon in combination with efficient filtration of the turbid filter.

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 utility model discloses a dimethyl phosphite preparation system based on a continuous flow reactor, and belongs to the technical field of glyphosate production. The preparation system comprises a continuous flow reactor I, a continuous flow reactor II and a gas-liquid separator, the continuous flow reactor I is connected with a phosphorus trichloride storage tank, and the continuous flow reactor I is connected with a water storage tank; the continuous flow reactor I is connected with a continuous flow reactor II, and the continuous flow reactor II is connected with a methanol storage tank; the continuous flow reactor II is connected with the gas-liquid separator; the gas-liquid separator is connected with a vacuum deacidification system, and the vacuum deacidification system is connected with the product tank; the gas-liquid separator is connected with a washing system; and the washing system is connected with the tail gas recovery system. The method not only ensures efficient and continuous preparation of dimethyl phosphite, but also realizes cost saving, byproduct reduction, environmental protection pressure reduction and the like.

The present application relates to the field of the manufacturing of flame-retardant thin films, in particular to a method for preparing a flame-retardant cellulose ester thin film. Dimethyl phosphite, which acts as a flame-retardant monomer, is subjected to transesterification using 1,8-diazabicycloundec-7-ene as a catalyst in a 1-butyl-3-methylimidazolium chloride / dimethyl sulfoxide cosolvent system to synthesize a phosphite cellulose ester, and then, a phosphite cellulose ester thin film is prepared in dimethyl sulfoxide by means of solvent evaporation. The residual carbon rate of the prepared phosphite cellulose ester thin film is 30.4-33.7%. The operation process is simple, the cellulose solvent used is green and environmentally-friendly, the prepared cellulose ester can be applied to flame-retardant coatings, and the cellulose ester thin film can be applied to packaging materials, so that the problems of flammability, etc. of existing cellulose-based products are solved.

The invention discloses a preparation of a phosphorus-containing seven-membered fluorine-boron compound and its application in fluorescent ink. The compound structure is as shown in the figure below: the dye uses 2,3,3-trimethylindole and 2-pyrrolecarboxaldehyde as raw materials. Under the action of acetic acid, piperidine and toluene, through Knoevenagel condensation reaction, a seven-membered fluorine-boron fluorescent dye is generated. This seven-membered fluorine-boron fluorescent dye is reacted with dimethyl phosphite, diphenylphosphine oxide, diisopropyl phosphite, diisobutyl phosphite and diethyl phosphite to obtain the final compound. The compound has a high fluorescence quantum yield in some solutions. The compound is dissolved in a n-butanol solution of acrylic resin and can be used as a fluorescent ink. It acts on materials such as sulfuric acid paper and glass plates and has high concealment and is simple and easy to obtain.

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.