287 results about "Chloroethane" patented technology

The invention relates to the technical field of aluminum alloy materials, in particular to a high-temperature-resistant and high-strength aluminum alloy material and a preparation method thereof. The problems that an existing aluminum alloy material is insufficient in mechanical property and poor in high temperature resistance are solved. A plurality of strengthening elements with synergistic effects, including copper, magnesium, scandium, zirconium, nickel, manganese and titanium, are introduced into an aluminum alloy matrix, meanwhile, multiple layers of graphene nanosheets are added for step-by-step smelting, and under argon protection, hexachloroethane refining and lithium salt complexing agent grain refinement are performed to prepare a smelted alloy; and by combining the multi-stage refined smelting, the staged heat treatment process, the three-stage aging treatment and the surface modification process, the microstructure is optimized, and meanwhile the surface performance is improved. According to the prepared aluminum alloy material, through multi-element cooperation and multi-process optimization, the mechanical property, the high temperature resistance and the surface oxidation resistance of aluminum alloy are remarkably improved, and the aluminum alloy material is suitable for the field of aerospace.

The invention provides a preparation method of a PI / SiO2 modified PET (Polyethylene Terephthalate) high-temperature-resistant composite release film, which comprises the following steps: S1, preparing a polyamide acid fiber film by using a polyamide acid precursor solution as an electrostatic spinning solution and adopting an electrostatic spinning method; s2, applying a drawing force to the polyamide acid fiber membrane at a preset temperature for hot drawing, and then carrying out thermal imidization treatment to obtain a PI nanofiber membrane; s3, adding PET into a mixed solvent of phenol and tetrachloroethane, and stirring until the PET is completely dissolved to obtain a PET solution; s4, adding strawberry-shaped SiO2 gel microspheres into the PET solution, and uniformly stirring to obtain a PET composite solution; and S5, adding the PI nanofiber membrane prepared in the step S2 into a mold, fixedly paving, blade-coating the PI nanofiber membrane with the PET composite solution, and removing the solvent to obtain the high-temperature-resistant release film. According to the invention, the PI electrostatic spinning film is matched with the strawberry-shaped SiO2 gel microspheres, so that the PET release film has better temperature resistance.

The invention relates to the technical field of preparation of aluminum alloy conductor materials, and particularly discloses a preparation method of an Al-Mg-Si-RE-based aluminum alloy conductor for a 10-35kV middle and low voltage cable, which comprises the following steps: adding a microalloyed intermediate alloy into an aluminum melt by adopting an addition method, stirring, smelting, refining, and casting to form, thereby obtaining the Al-Mg-Si-RE-based aluminum alloy conductor for the 10-35kV middle and low voltage cable. And performing annealing, rolling, wire drawing and aging heat treatment to obtain a final product. Wherein in the smelting stage, raw materials are completely melted at 700-750 DEG C; hexachloroethane is used as a refining agent for refining; annealing at 330-350 DEG C and preserving heat for 4-8 hours; and aging at 300 DEG C for 10 hours after deformation. In the preparation of a wire of a 10-35kV medium and low voltage power cable, the aluminum alloy wire has high conductivity of 62.1-62.5% IACS (International Annealed Copper Standard) and tensile strength of 101-117MPa by simplifying the process steps and optimizing the element ratio on the premise of ensuring the controllable raw material cost, and the mechanical property and electrical property requirements of the medium and low voltage wire are balanced.

The invention provides a synthetic method of 2-methyl-4-chloropropionic acid-polyethylene glycol ester, and belongs to the technical field of preparation of 2-methyl-4-chloropropionic acid-polyethylene glycol ester. The method comprises the following steps: adding o-cresol, dichloroethane and a catalyst, and reacting sulfuryl chloride at the temperature of below 15 DEG C; performing separation to obtain p-chloro-o-cresol and 6-chloro-o-cresol; adding p-chloro-o-cresol, 2-chloropropionic acid and caustic soda liquid to synthesize 2-methyl-4-chloropropionic acid; 2-methyl-4-chloropropionic acid is acidized, cooled, crystallized and sliced, 2-methyl-4-chloropropionic acid, polyethylene glycol and a neutral catalyst are added for a reaction, and the di-2-(4-chloro-2-methyl-phenoxy) propionic acid-polyethylene glycol ester is synthesized. The method is simple in process, mild in reaction and high in yield. By means of the synthesis method, a qualified product with the p-chloro-o-cresol content larger than 99% can be produced, other phenol impurities are not contained, the synthesis quality of p-chloro-o-cresol is guaranteed, meanwhile, synthesis of 2-methyl-4-chloropropionic acid-polyethylene glycol ester is easier to control, the product quality can be greatly improved, and meanwhile the domestic blank is filled up.

The invention discloses a catalytic combustion catalyst for treating CVOCs (Chemical Volatile Organic Compounds) as well as a preparation method and application of the catalytic combustion catalyst. The preparation method comprises the following steps: (1) impregnating and loading cerous nitrate and trimethyl phosphate on a carrier, drying, and roasting at 600-800 DEG C to form a modified carrier containing a cerous phosphate crystal phase; and (2) impregnating and loading active metal ruthenium on the modified carrier, drying and roasting to obtain the catalyst for treating catalytic combustion of the CVOCs. The catalyst provided by the invention can be used for catalytic combustion degradation of CVOCs such as dichloromethane, chlorobenzene, chloroethylene, dichloroethane, dichloroethylene, oxychloropropane and the like. For catalytic combustion degradation of CVOCs, the catalyst disclosed by the invention can show high activity, high chlorine-resistant stability, low polychlorinated by-product selectivity and thermal stability, and has certain industrial application prospects.

The present invention provides a polymer with a polar group or a heterocyclic-bridged phthalazinone structure and a preparation method thereof, which relates to the technical field of synthesis of polymer materials. The polymer with a polar group or a heterocyclic-bridged phthalazinone structure mainly has more excellent heat resistance and good solubility by introducing a polar group or a heterocyclic-bridged phthalazinone structure. Its glass transition temperature can reach up to 405 °C and it can be dissolved in polar aprotic organic solvents such as N-methylpyrrolidone and 1,1,2,2-tetrachloroethane. In addition, the present invention can also regulate the heat resistance and solubility of such polymers by adjusting the structure and proportion of the structural unit with a polar group or a heterocyclic-bridged phthalazinone structure and other structural units, so that it can meet the needs of more different application scenarios. The present invention also provides a preparation method of the above polymer.

The invention relates to a hyper-crosslinked polyionic liquid modified MXene nano composite material as well as a preparation method and application thereof, and belongs to the field of nano functional materials. The invention relates to a preparation method of a hyper-crosslinked polyion liquid modified MXene nanocomposite, which comprises the following steps: dissolving vinylated MXene nanosheets and 1-vinyl-3-butylimidazolium bromide in toluene, adding styrene into the obtained solution, adding azodiisobutyronitrile, and reacting to obtain the polyion liquid modified MXene nanocomposite. Adding the obtained polyion liquid modified MXene composite material and dimethoxymethane into dichloroethane to uniformly disperse the polyion liquid modified MXene composite material, then adding anhydrous ferric trichloride into the solution, and reacting to obtain the hypercrosslinked polyion liquid modified MXene nano composite material. When the composite adsorbent provided by the invention is used for adsorbing the IBP, the highest removal rate can reach 93.2%, and the composite adsorbent is simple to operate, high in stability and environment-friendly.

The invention belongs to the technical field of hexafluoroethane purification, and particularly relates to a purification process and a purification device of electronic-grade hexafluoroethane. The purification process of the electronic-grade hexafluoroethane comprises the following steps: introducing a hexafluoroethane crude product into a preprocessor, and carrying out pretreatment; introducing the crude product treated by the pretreater into an adsorption tower for adsorption; introducing the adsorbed crude product into a condenser to remove non-condensable gas so as to obtain crude product condensate, and introducing the crude product condensate into an alkali washing tank for alkali washing; and the alkali-washed crude product sequentially enters a degassing tower and a rectifying tower, and is degassed and rectified to obtain the electronic-grade hexafluoroethane product. According to the purification process of the electronic-grade hexafluoroethane, the pretreatment agent and the adsorbent are designed, so that the purity of the hexafluoroethane reaches 99.999%, the conversion of pentafluoromonochloroethane and the removal of trifluoromethane are realized, the process is simple, and the energy consumption is low; the invention also provides a purification device corresponding to the purification process of the electronic-grade hexafluoroethane.

The invention relates to the technical field of high polymer materials, in particular to a preparation method and application of ternary hydroxyalkyl cellulose ether for a sustained-release coating material.The preparation method comprises the steps that an alkali metal catalyst, purified water, polyhydric alcohol and cellulose are put into a high-pressure reaction kettle, heating and vacuumizing are conducted, firstly, chloromethane and epoxypropane are introduced for an etherification reaction for a certain time, and then the mixture is cooled to the room temperature; the ternary hydroxyalkyl cellulose ether is prepared by adding potassium hydroxide after cooling, vacuumizing, heating, introducing chloroethane, completing an etherification reaction, washing, drying, crushing and synthesizing, has hydrophilic and hydrophobic characteristics of different degrees, is applied to a film coating premix formula, and can be used for preparing a film coating premix. The prepared coating film has excellent properties of slow release, high salt resistance, high release stability and the like.

The invention relates to a preparation method of a lithium difluoro bis (oxalate) phosphate concentrated solution, and belongs to the technical field of lithium battery electrolyte additives. Adding lithium oxalate into a solvent, stirring and dissolving to obtain a lithium oxalate solution; the method comprises the following steps: adding a modified fluorine ion chelating agent into a lithium oxalate solution, stirring, filtering, putting into a reactor, and slowly introducing phosphorus pentafluoride gas; after the introduction is finished, heating and stirring for reaction; after the reaction is finished, filtering reaction liquid to remove unreacted solid impurities, so as to obtain a lithium difluoro bis (oxalate) phosphate concentrated solution; the modified fluorine ion chelating agent is prepared from D301 ion exchange resin, dichloroethane, propylene-1-base boronic acid pinacol ester, mercaptoethyl guanidine dihydro bromide and sodium tert-butoxide. The lithium difluoro bis (oxalate) phosphate prepared by the method is high in purity and high in yield, and meets the use requirements of lithium ion battery electrolyte on lithium salt.

The utility model provides a system for producing vinyl chloride through oxychlorination, and belongs to the field of vinyl chloride synthesis. According to the system for producing vinyl chloride through oxychlorination, dichloroethane is prepared through the oxychlorination reaction unit, then the dichloroethane is refined through the refining unit, then the refined dichloroethane is cracked in the cracking unit to prepare vinyl chloride, and finally the vinyl chloride is obtained through purification in the vinyl chloride refining unit. Dichloroethane is prepared through a direct chlorination reaction unit, so that the yield of dichloroethane is increased, and a raw material is provided for cracking of dichloroethane; according to the system for producing vinyl chloride through oxychlorination, dichloroethane is prepared through the oxychlorination reaction unit and the direct chlorination unit, so that the working efficiency of the system is improved.

The invention discloses a process for continuously producing chloroethane by using byproduct hydrogen chloride, which belongs to the field of chloroethane production, and comprises the following steps: (1) catalytic reaction: fully mixing hydrogen chloride and ethylene, and feeding the mixture into a reactor for reaction to generate a gas phase and a liquid phase; (2) multi-stage condensation: after the gas phase of the reactor is subjected to first-stage circulating water cooling condensation and second-stage refrigerant cooling, most of chloroethane is cooled to a crude product tank, and a small amount of residual chloroethane and hydrogen chloride enter the reactor through a compressor; and (3) recycling hydrogen chloride: a gas phase obtained by secondary condensation mainly comprises hydrogen chloride, and is recycled to the bottom of the reactor for continuous reaction after being pressurized by a compressor, the process flow is simple, the purity of chloroethane is high, the production consumption is low, and recycling and continuous production of chloroethane are realized.

The utility model relates to the technical field of rectifying kettles, and discloses a rectifying kettle for rectifying and purifying chloroethane, which comprises a main body mechanism and an auxiliary mechanism, the auxiliary mechanism is positioned at the upper end of the main body mechanism, and the main body mechanism comprises a lower kettle, a flange and a liquid membrane separator; according to the rectifying still for rectifying and purifying the chloroethane, the main body mechanism is mounted, so that a liquid membrane separator plays a role in separation, the upper still fixes a feeding pipe and an exhaust pipe, a fixing frame fixes a rotating motor, the fixing and stability of the rotating motor are improved, the rotating motor provides power, and a rotating shaft fixes a rotating shaft; the rotating shaft drives the bubble pricking needle to rotate to prick generated bubbles, so that the problem of unsmooth gas rising caused by more bubbles in the rectification process is solved, the rectification efficiency is improved, the bubble pricking needle plays a role in pricking the bubbles, the heating pipe plays a role in heating liquid, and the heat preservation layer plays a role in heat preservation, so that the temperature in the kettle is kept consistent; the practicability of the rectifying still for rectifying and purifying the chloroethane is improved.

The invention relates to the field of environmental bioremediation, in particular to a novel Desulfovibrio Co strain and application of the novel Desulfovibrio Co strain in reduction of sulfate type oxidized sulfide and degradation and conversion of 1, 1, 1-trichloroethane. The desulfurization vibrio Co strain is preserved in China General Microbiological Culture Collection Center (CGMCC) on February 24, 2024, the address is Institute of Microbiology, Chinese Academy of Sciences, No.3, No.1 Yard, Beichen West Road, Chaoyang District, Beijing, the postcode is 100101, and the preservation number is CGMCC No.41182. The desulfurization vibrio Co strain can be used for preparing the desulfurization vibrio Co strain.

The invention discloses a synthesis method of a catalyst for preparing vinyl chloride through catalytic cracking of high-activity 1, 2-dichloroethane, and active components in the catalyst are uniformly dispersed on nitrogen-doped carbon dots loaded on activated carbon. The method comprises the following steps: firstly preparing nitrogen-doped carbon dots containing active components, and then loading the nitrogen-doped carbon dots on activated carbon to prepare the composite catalyst. The catalyst can efficiently catalyze the reaction of cracking 1, 2-dichloroethane to prepare vinyl chloride. Compared with the existing catalyst for preparing vinyl chloride by cracking 1, 2-dichloroethane, the active component has better dispersity, the energy consumption can be greatly reduced, the production cost is reduced, and the catalyst has a very good industrial prospect.

The invention discloses a modification and grain refiner for Al-Si series die-casting aluminum alloy, which comprises the following components in mass percentage: 60-80% of rare earth aluminum alloy powder, 19-39% of auxiliary agent A, and 0.1-1.0% of auxiliary agent B; in the rare earth aluminum alloy powder, rare earth elements account for 2-20% of the total amount, the total amount of Fe and Si is ≤0.1%, and the balance is aluminum; the rare earth element is any one or a combination of two of La, Ce, Y, Er, and Sc; the auxiliary agent A comprises light calcium carbonate, sodium cryolite, potassium cryolite, sodium fluorosilicate, lithium fluoride, potassium fluoride, sodium fluoride, aluminum fluoride, sodium chloride, potassium chloride, potassium fluoroborate, magnesium chloride, and hexachloroethane; the auxiliary agent B comprises polyethylene glycol and stearamide. The modification and grain refiner obtained by mixing rare earth aluminum alloy powder, additive A and additive B can be evenly dispersed in the aluminum alloy melt to play the role of long-term modification and grain refinement as well as refining and dehydrogenation.

The invention discloses a method for preparing brominated polystyrene, and belongs to the technical field of brominated polystyrene preparation. The method comprises: preparing a main chain bromination inhibitor, preparing a catalyst, and reacting; in the reaction, polystyrene and ethylene dichloride are mixed, stirred at 35-40°C for 30-40min under the protection of nitrogen, then cooled to 0-2°C, the main chain bromination inhibitor and the catalyst are added, stirred for 20-30min, and a dichloroethane solution of N-bromosuccinimide is added dropwise, and after the addition is completed, the mixture is stirred at room temperature for 1.5h, the reaction is terminated, and the mixture is washed with a sodium hydroxide aqueous solution, washed with water, and then filtered, and the filtrate is evaporated and crystallized, filtered, and vacuum dried to obtain brominated polystyrene; the brominated polystyrene prepared by the invention has good color performance and thermal stability, high bromine content, narrow molecular weight distribution, good reaction controllability, and short reaction time.

The invention discloses a resource utilization method of 1, 1, 2-trichloroethane waste liquid, which comprises the following steps: 1) feeding the 1, 1, 2-trichloroethane waste liquid into a scraper device to remove heavy components, and extracting gas-phase light components from the top; (2) condensing the gas-phase light component, feeding into a chlorination reactor, and carrying out chlorination reaction; and 3) carrying out reactive distillation on the material at the outlet of the chlorination reactor to remove light components and heavy components to obtain 1, 1, 2-trichloroethane. According to the method, on one hand, impurities which influence the purity of 1, 1, 2-trichloroethane and are difficult to separate react with chlorine under specific conditions to generate heavier components, and on the other hand, it is ensured that light components cannot be chlorinated into the impurities which are difficult to separate, and 1, 1, 2-trichloroethane with the purity being 99% or above can be recycled; on the other hand, 5-20 wt% of 1, 1, 2-trichloroethane is additionally generated in the reactive distillation process, waste liquid recycling is achieved, and the method has the advantages of being simple in technological process, low in energy consumption and high in product yield.

The invention discloses high-toughness weather-resistant high-temperature-resistant chlorinated polyvinyl chloride and a production method thereof, and belongs to the technical field of chlorinated polyvinyl chloride, the production method comprises pretreatment, reaction and post-treatment; the reaction comprises the following steps: sealing a reaction device, replacing air in the reaction device with nitrogen, adding pretreated polyvinyl chloride, Tween 80, styrene, 1, 2-dichloroethane and deionized water into the reaction device, stirring at 75-80 DEG C, adding azodiisobutyronitrile, fumed silica, a polyvinyl alcohol aqueous solution and methacrylic acid, then irradiating with ultraviolet light, and reacting at the temperature of 75-80 DEG C, so as to obtain the polyvinyl chloride resin. The preparation method comprises the following steps of: adding sodium hydroxide into a reaction kettle, simultaneously introducing chlorine gas, stirring, adding lime milk to adjust the pH value to 6-6.5, heating to 85-90 DEG C, adding azodiisobutyronitrile, 2-dodecyl acrylate and vinyl stearate, and stirring; the chlorinated polyvinyl chloride prepared by the invention has the advantages of high toughness, good weather resistance and high temperature resistance, and also has excellent mechanical strength, machinability and appearance.

The invention provides a furfuryl alcohol preparation method, and relates to the technical field of furfuryl alcohol preparation, magnesium chips are placed in methyl tert-butyl ether or a mixed solution of methyl tert-butyl ether and tetrahydrofuran, nitrogen replacement is carried out, chloroethane / chloromethane gas is introduced after nitrogen replacement, a Grignard reagent is generated through a reaction, and a solution containing the Grignard reagent is obtained; the method comprises the following steps: dropwise adding furfural into a solution containing a Grignard reagent to carry out an addition reaction, dropwise adding soft water to carry out a hydrolysis reaction when the temperature does not change, and carrying out suction filtration when the temperature does not change to obtain a mother solution; carrying out reduced pressure distillation on the obtained mother liquor to obtain furfuryl alcohol; in the Grignard reagent preparation process, methyl tert-butyl ether is used as a solvent; the solvent containing methyl tert-butyl ether reduces the initiation temperature of the Grignard reagent, avoids the coupling reaction of the generated Grignard reagent, improves the yield and purity of the Grignard reagent, and further improves the yield and purity of the prepared furfuryl alcohol.

The invention discloses a method for preparing vinyl chloride by electrocatalytic dechlorination of 1, 2-dichloroethane, a working electrode of the method takes a metal oxide as a catalyst, and the metal oxide is selected from at least one of the following metal oxides: Pd, Mn, Fe, Co, Ni, Cu, Ru and Mo. According to the invention, the metal oxide powder is used as the electrocatalyst, the catalyst is coated on the electrode material to prepare the working electrode, the working electrode is applied to electrocatalytic dechlorination reaction of 1, 2-dichloroethane, vinyl chloride can be generated at high selectivity at room temperature, a new way is opened up for production of vinyl chloride by electrocatalytic dechlorination, and the method has wide application prospect. And a green and low-cost solution is provided for efficient synthesis of vinyl chloride.

The present application relates to the field of non-woven fabric technology, and specifically discloses a biodegradable non-woven fabric and its preparation method. The non-woven fabric is mainly made of the following raw materials in parts by weight: 100 parts of polypropylene, 1-2 parts of biodegradable masterbatch, 6-8 parts of modified chitosan, 3-5 parts of maleic anhydride grafted polypropylene, and 1-2 parts of antioxidant; the modified chitosan is obtained by treating chitosan with sodium hydroxide, 1-chlorododecane, and 4-(2-chloroethane acylamino) ethyl benzoate. The biodegradable non-woven fabric has the advantages of high breaking strength and good degradability, expands the scope of application, can solve the environmental pollution problem caused by the difficulty of degradation of traditional polypropylene non-woven fabrics, and meets market demand.

The invention provides a method for detecting chloroethane in hexyl aminolevulinate hydrochloride and application, the method comprises the following steps: preparing a reference solution and a test solution, the reference solution is a standard chloroethane solution, and the test solution is a hexyl aminolevulinate hydrochloride solution containing chloroethane; respectively injecting the reference solution and the test solution into a GC-MS (Gas Chromatography-Mass Spectrometer) by adopting a headspace sampling mode, and recording chromatograms; calculating the content of chloroethane in the test sample according to a peak area by an external standard method; the used gas chromatographic column is DB-FFAP, and the adopted gas chromatographic determination conditions are as follows: the flow of the chromatographic column is 1-10ml / min; the initial temperature of the column temperature is 25-50 DEG C, the initial temperature is maintained for 1-10 minutes, and the initial temperature is increased to 150-250 DEG C at the rate of 10-50 DEG C / min and maintained for 1-10 minutes; the temperature of a sample inlet is 150-30 DEG C; the sample size is 0.5 to 5 ml; the mass spectrum conditions are as follows: the operation time is 5-20 minutes; and the mass-to-charge ratio of chloroethane is 64 and 66. The method can be used for accurately and quickly detecting the content of chloroethane in hexyl aminolevulinate hydrochloride.

The invention relates to the technical field of organic synthesis, in particular to a production method for co-production of chloroethylene carbonate and chloroethane, which comprises the following steps: chlorine and ethylene carbonate are used as raw materials to prepare a chloroethylene carbonate crude product under the illumination condition, and hydrogen chloride gas is produced as a byproduct; purifying the chloroethylene carbonate crude product to obtain a chloroethylene carbonate finished product; the method comprises the following steps: mixing hydrogen chloride gas with ethanol gas, and catalyzing under the action of a catalyst to generate crude chloroethane synthesis gas; and carrying out pressure swing adsorption separation on the chloroethane crude product synthesis gas, compressing the chloroethane gas to obtain a chloroethane liquid finished product, and recycling the surplus ethanol to the mixing process. According to the production method for co-production of chloroethylene carbonate and chloroethane, the byproduct hydrogen chloride in preparation of chloroethylene carbonate is used as a raw material for synthesis of chloroethane, so that resource utilization of waste gas is effectively realized, the treatment cost of tail gas is greatly reduced, and remarkable economic benefits are achieved.

The utility model relates to a low-acidity high-purity difluorochloroethane alkali washing system, which is characterized in that two stages of alkali washing towers are respectively matched with an alkali washing tank, a first alkali washing tower is connected with a first alkali washing tank, the first alkali washing tank is divided into three paths after passing through a first alkali washing pump and a first cooler, and the three paths are respectively connected with the first alkali washing tank, a sodium hypochlorite storage tank and a first condenser and then are connected with the upper part of the first alkali washing tower; a cooling liquid inlet pipe of the first cooler is connected with a flow regulating valve, the bottom of a second alkaline washing tower connected with the top of the first alkaline washing tower, the structures of the second alkaline washing tower and the second alkaline washing tank are the same as those of the first alkaline washing tower and the first alkaline washing tank, and the top of the second alkaline washing tower is connected with an alkaline washing separator buffer. The controller is used for collecting the temperature of alkali liquor sent out of the alkali washing tank and the cooler and entering the alkali washing tower, so that the opening degree of the flow regulating valve is controlled to enable the alkali liquor to be sent into the alkali washing tower within a certain range, and alkali washing efficiency is improved.

The invention discloses a method for synthesizing 2-aminopyridine, comprising using polystyrene resin beads as a carrier, a mixed solvent consisting of 1,2-dichloroethane and anhydrous ethanol as a porogen, adding the polystyrene resin beads and the mixed solvent to a flask for swelling; adding N,N-dimethylaniline to the flask, and performing a stirring reflux reaction; repeatedly washing the mixed solution in the flask with anhydrous ethanol and filtering it with suction, and finally vacuum drying it at room temperature. The method for synthesizing 2-aminopyridine utilizes polymer resin beads as a carrier, grafts a preferred highly active phase transfer catalyst molecule - N,N-dimethylaniline, and synthesizes a solid-supported phase transfer catalyst to achieve efficient recycling and regeneration of the phase transfer catalyst, and ensures the yield of the pyridine amination product by the solid-supported phase transfer catalyst, which is conducive to ensuring the efficient resource utilization of basic nitrogen heterocyclic compounds in coal tar.

The application discloses a high-beta-crystal-phase polyvinylidene fluoride fiber piezoelectric film and a preparation method thereof, wherein the preparation method comprises the following steps: step one: polyvinylidene fluoride resin with a weight average molecular weight of 500,000-800,000, a long branched chain content of 1.2‰-5‰, and a 7% mass fraction NMP solution rotary viscosity of 5000-8000 mpa.s at 25 DEG C is prepared by emulsion polymerization of polyvinylidene fluoride monomer and difluoro-monochloroethane; and step two: the polyvinylidene fluoride resin obtained in step one is made into an electrostatic spinning precursor solution, and the electrostatic spinning precursor solution is spun and film-formed by an electrostatic spinning method. The polyvinylidene fluoride nanofiber film with finer and higher beta-crystal-phase content can be prepared by adjusting the content of the long branched chain and the viscosity of the electrostatic spinning solution.

The invention relates to the field of IPC C07F 9 / 11, in particular to a preparation method of triethyl phosphate. Comprising the following steps: first-stage esterification; carrying out second-stage esterification; carrying out neutralization reaction; dealcoholization is performed; rectifying under reduced pressure; according to the preparation method, a segmented reaction is matched with specific post-treatment (ammonia gas introduction), so that the purity of the obtained product is more than 99.5%, the water content is controlled to be less than 0.04, the color (APHA) is less than or equal to 10, and the acid value is controlled to be less than 0.06 mgKOH / g; according to the method, the ammonia gas is added after the reaction is finished, so that dangerous substances of chloroethane are prevented from being generated by the reaction of ethanol and hydrogen chloride, the product is prevented from being decomposed into diethyl phosphate, the product yield is increased, and the residual liquid amount is reduced.

A process is disclosed for producing ethylene dichloride from monoethylene glycol and hydrogen chloride in the presence of water, thereby forming an ethylene dichloride-rich liquid phase that can be readily separated from a coexisting aqueous phase. The reaction is carried out under conditions that limit both 2-chloroethanol and ethylene dichloride in the vapor phase, facilitating high conversion efficiencies and minimizing ethylene dichloride losses. The process includes a reaction step in which monoethylene glycol is converted to 2-chloroethanol and subsequently to ethylene dichloride, generating water that aids in separating by-products from the ethylene dichloride-rich phase. A phase-separation system is employed to decant the heavier, ethylene dichloride phase from an aqueous phase containing residual reactants and by-products. Additional purification steps, such as washing with substantially anhydrous monoethylene glycol, further remove water, acids, and 2-chloroethanol, producing high-purity ethylene dichloride. Recycling unconverted monoethylene glycol and 2-chloroethanol to the reactor increases overall conversion and enhances process economics.

The invention provides a polar group or heterocyclic ring bridged bis (phthalazinone) structure polymer and a preparation method thereof, and relates to the technical field of high polymer material synthesis. According to the polar group or heterocyclic ring bridged bis (phthalazinone) structure polymer, the polar group or heterocyclic ring bridged bis (phthalazinone) structure is introduced, so that the polymer has more excellent heat resistance and good solubility, the glass-transition temperature of the polymer can be up to 405 DEG C, and the polymer can be dissolved in N-methyl pyrrolidone, 1, 1, 2, 3, 4-tetramethyl-3-pyrrolidone, 1, 1, 2, 3-tetramethyl-3-pyrrolidone, 1, 1, 2, 3, 3-tetramethyl-3-pyrrolidone and 1, 1, 2, 3, 3-tetramethyl-3-pyrrolidone. A polar aprotic organic solvent such as 1, 1, 2, 2-tetrachloroethane; besides, the heat resistance and solubility of the polymer can be regulated and controlled by regulating the structures and proportions of the polar group or heterocyclic bridged bis (phthalazinone) structural unit and other structural units, so that the polymer can meet the requirements of more different application scenes. The invention also provides a preparation method of the polymer.