222 results about "1-Chloropropane" patented technology

The invention relates to a method for continuously producing 1, 1, 1, 3-tetrachloropropane, which comprises the following steps: adopting a loop reactor in which a beam pipe is arranged in the reactor, mixing reaction raw materials ethylene and carbon tetrachloride at a Venturi nozzle at the lower part of the reactor through a gas circulation loop and a liquid circulation loop outside the reactor, and spraying into the reactor filled with a main catalyst. A cocatalyst and a chelating agent are added into a carbon tetrachloride raw material in advance, are pumped into a liquid loop by a feeding pump and then enter a reactor. Reaction raw materials are circularly stirred under the action of a beam pipe in the reactor, so that solid, liquid and gas phases are fully mixed. By adopting the method disclosed by the invention, the selectivity and the production efficiency of the 1, 1, 1, 3-tetrachloropropane can be greatly improved, and the method also has the advantages of simplicity in operation, environment friendliness, long service life of the catalyst and low cost.

Disclosed in the present invention is a method for co-producing 3,3,3-trifluoropropene and 2,3,3,3-tetrafluoropropene. The method comprises: introducing 1,1,1,3-tetrachloropropane, 1,1,1,2,3-pentachloropropane, and hydrogen fluoride into a first reactor, and reacting under the action of a first catalyst to obtain a first reactor reaction product; performing rectification on the first reactor reaction product to obtain a 3,3,3-trifluoropropene product and a tower kettle product, mixing the tower kettle product with hydrogen fluoride, and then introducing the mixture into a second reactor, and reacting under the action of a second catalyst to obtain a second reactor reaction product; and separating the second reactor reaction product from hydrogen chloride, water washing, alkaline washing, and drying to obtain a 2,3,3,3-tetrafluoropropene product. The present invention has the advantages of simple process, high efficiency, flexible operation, low investment, and low energy consumption.

The invention relates to the technical field of polyester fibers, and discloses a preparation method of antibacterial modified polyester hollow fibers, which comprises the following steps: by taking nitrilotriacetic acid, thionyl chloride, epoxy chloropropane, eugenol and the like as raw materials, carrying out acylating chlorination reaction, quaternization reaction and esterification reaction to obtain eugenol epoxy quaternary ammonium salt. The preparation method comprises the following steps: carrying out ring-opening reaction on carboxyl groups in graphene oxide and epoxy groups in eugenol epoxy quaternary ammonium salt to obtain modified graphene, uniformly mixing the modified graphene with polyethylene glycol terephthalate, and carrying out a series of steps to finally obtain the antibacterial modified polyester hollow fiber. Eugenol and quaternary ammonium salt are utilized to improve the antibacterial property of the polyester hollow fiber, and graphene is utilized to improve the mechanical property of the polyester hollow fiber. The polyester hollow fiber prepared by the invention has excellent mechanical properties and antibacterial properties.

The invention relates to the technical field of chemical production, in particular to a method for efficiently synthesizing epichlorohydrin. The method provided by the invention comprises the following steps: adding a mixed solution of chloropropene and methanol and part of hydrogen peroxide into a reactor; then injecting residual hydrogen peroxide through a middle-section feeding hole of the reactor; constant-temperature circulating water is adopted to control a front-section temperature control area of the reactor to be at a first temperature, a middle-section temperature control area of the reactor to be at a second temperature and a rear-section temperature control area of the reactor to be at a third temperature, and the third temperature, the first temperature and the second temperature are gradually increased in sequence. The method provided by the invention can effectively solve the problems of side reaction increase, too fast catalyst deactivation and the like caused by local overheating of the fixed bed reactor, and significantly improves product selectivity and production efficiency.

The invention discloses a preparation method of a branched epoxy resin pressure-bearing plugging material and an oil-based drilling fluid. The pressure-bearing plugging material has a branched structure and is characterized in that the raw materials of the material include: tetrahalogenated phenyls, tetrahalogenated naphthalenes, epichlorohydrin, hexagonal boron nitride, and a silane coupling agent, and the molar ratio of the tetrahalogenated phenyls, 2,3,6,7-tetrachloromethyl-1,4,5,8-tetramethylnaphthalene, and epichlorohydrin is approximately (1-2): (1-2): 4. The synthesized branched epoxy resin polymer is combined with a modified hexagonal boron nitride with a hydroxyl carboxyl group on the surface by using a silane coupling agent, and the pressure bearing capacity of the final product branched epoxy resin pressure-bearing plugging material can reach 150-180MPa, and the compressive strength is 2-3 times that of a traditional epoxy resin plugging material. The material is applied to an oil-based drilling fluid to enhance the plugging performance of the drilling fluid.

The invention discloses a zinc-bromine flow battery multifunctional bipolar plate and a preparation method and application thereof.The method comprises the steps that polyaniline is added into a cetyltrimethylammonium bromide ethanol solution, after stirring and ultrasonic treatment, a mixed solution is obtained and sprayed to the positive electrode side of a pretreated polypropylene bipolar plate, and after drying, the zinc-bromine flow battery multifunctional bipolar plate is obtained; the polyaniline modified polypropylene bipolar plate is obtained; the preparation method comprises the following steps: dissolving beta-cyclodextrin in a NaOH solution, adding epoxy chloropropane, stirring for reaction, washing to be neutral, drying, grinding and sieving to obtain a cyclodextrin polymer, dispersing the cyclodextrin polymer in a Nafion solution to obtain a cyclodextrin polymer solution, spraying the cyclodextrin polymer solution on the negative electrode side of a polyaniline modified polypropylene bipolar plate, and drying to obtain the multifunctional bipolar plate of the zinc-bromine flow battery. Polyaniline is loaded on the positive electrode side of the bipolar plate to reduce a bromine permeation source and bromine reaction activation energy, a cyclodextrin polymer Nafion solution is used for modifying and stabilizing the pH value of an electrolyte on the negative electrode side, uniform and compact deposition of zinc is promoted, formation of sharp dendrites is reduced, and the electrochemical performance and long-term stability of the battery are improved.

The invention discloses a preparation method of high-viscosity cationic starch, which belongs to the technical field of modified starch, and comprises the following steps: crosslinking epichlorohydrin, ball-milling and cationizing; the epoxy chloropropane crosslinking comprises the following steps: mixing starch, calcium hydroxide and deionized water, stirring at 40-50 DEG C, adding sodium stearoyl lactylate, stirring at 50-55 DEG C, naturally cooling to room temperature, adding sodium chloride and epoxy chloropropane, stirring, dropwise adding a potassium hydroxide aqueous solution, stirring, adjusting the pH value to 6, filtering, taking filter residues, washing and drying to obtain crosslinked starch; in the step of ball milling, calcium hydroxide, sucrose fatty acid ester SE-11 and deionized water are mixed and then subjected to ball milling, and a ball-milled material is obtained; the prepared high-viscosity cationic starch is high in paste liquid viscosity and cationic substitution degree, good in paste liquid viscosity stability, uniform in substitution degree and paste liquid viscosity, high in reaction efficiency in cationization and low in alkali consumption.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a catalyst special for tetrachloropropane dehydrochlorination and a preparation method and application thereof. The preparation method of the catalyst comprises the following steps: (1) placing gamma-alumina powder in a solvent, adding an amino-containing silane coupling agent, and heating for reaction to obtain modified gamma-alumina powder; and (2) preparing modified gamma-alumina powder loaded with trivalent iron salt or trivalent chromium salt, and drying to obtain the special catalyst for dehydrochlorination of tetrachloropropane. Iron ions or chromium ions complexed by an amino silane coupling agent improve the stability of the active component, the active component is attached to a gamma-alumina matrix by the catalyst, the activity of the main catalyst can be effectively regulated and controlled, the phenomena of chlorine absorption, coking and the like are reduced, the dehydrochlorination reaction is carried out when tetrachloropropane is in contact with the solid matrix, and the dehydrochlorination reaction is carried out when the tetrachloropropane is in contact with the solid matrix. On the basis of high conversion rate and selectivity, side reaction is avoided.

The invention belongs to the technical field of organic synthesis, and particularly relates to a method for continuously synthesizing 2-chloropropane, which comprises the following steps: uniformly mixing preheated hydrogen chloride gas and vaporized isopropanol through a mixer, introducing into a fixed bed reactor filled with a solid catalyst, and contacting with the catalyst to start reaction to generate mixed gas containing 2-chloropropane; and carrying out gas-liquid separation on the mixed gas containing 2-chloropropane, and standing and layering the liquid phase to obtain the 2-chloropropane product on the upper layer. According to the method, the problem of continuous synthesis of 2-chloropropane is solved, the production efficiency is greatly improved, meanwhile, the problem that high-price special material equipment is needed in the reaction is solved, and the production cost is reduced. The problems of high reaction temperature, low selectivity and low yield are solved, the product purity of the reaction exceeds 99%, and the yield reaches more than 98.5%.

The present invention discloses a haloalkane dehalogenase and its application in the degradation of 1,2,3-trichloropropane. The haloalkane dehalogenase provided by the present invention is a protein with the amino acid sequence of SEQ ID NO.1. The haloalkane dehalogenase of the present invention has high degradation activity towards the refractory and highly toxic 1,2,3-trichloropropane, and can degrade 42.63% of 1,2,3-trichloropropane after 2 h of reaction, with a fast biodegradation rate; IPTG is used to induce the expression of the haloalkane dehalogenase in recombinant bacteria, and high enzyme activity can be obtained after 5 h of expression. The recombinant bacteria express the haloalkane dehalogenase faster and with higher yields. The haloalkane dehalogenase of the present invention has high activity in a relatively wide pH range (3.0 - 9.0) and temperature range (25°C - 60°C), and has a relatively broad application scope.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a pentachloropropane dehydrochlorination catalyst and a preparation process of tetrachloropropene. The preparation process of the catalyst comprises the following steps: (1) modifying gamma-aluminum oxide powder by adopting an epoxy group-containing silane coupling agent to obtain activated gamma-aluminum oxide powder; (2) dispersing the activated gamma-aluminum oxide powder and polyamino POSS in a solvent, and stirring for reaction to obtain modified gamma-aluminum oxide powder; and (3) preparing trivalent metal salt-loaded modified gamma-alumina powder, and drying to obtain the pentachloropropane dehydrochlorination catalyst. The epoxy group-containing silane coupling agent not only improves the dispersion performance of alumina, but also plays a medium role, so that POSS is attached to the surface of alumina powder, and the stability of the catalyst is improved. Amino groups on POSS are used for complexing trivalent metal ions, and POSS micromolecules can also serve as a transmission track of a substrate, so that the catalytic activity is improved.

The invention discloses a method for efficiently preparing 1, 1, 2, 3-tetrachloropropene, which comprises the following steps: by taking 1, 1, 2, 2, 3-pentachloropropane / 1, 1, 1, 2, 3-pentachloropropane as a raw material, carrying out dehydrochlorination reaction in a tank reactor under the action of a composite catalyst to prepare the 1, 1, 2, 3-tetrachloropropene. Compared with the traditional dehydrochlorination of alkali liquor, the method has the advantages of less generation of three wastes, simple process operation and easiness in industrial implementation. The prepared composite catalyst can be suitable for pentachloropropane of different structures as a raw material, the catalyst compatibility is high, the application scene is wide, the composite catalyst is good in catalytic activity and high in selectivity, and the selectivity of tetrachloropropene is 95% or above and can reach 99% to the maximum. Meanwhile, the composite catalyst is good in regeneration performance, the inactivated catalyst is easy to regenerate, and the catalytic activity is not reduced after regeneration; the composite catalyst material is easy to obtain and low in price, the production cost can be greatly saved, and industrial production is facilitated.

The invention provides a composite adsorbent and a preparation method and application thereof.The composite adsorbent is prepared by taking a food processing by-product banana peel which is low in cost, simple and easy to obtain as a raw material and adsorbing a modifier chitosan acetic acid solution on the banana peel, the components have a synergistic effect, the banana peel is taken as a carrier, and the composite adsorbent is prepared from the banana peel and the chitosan acetic acid solution. Hydroxyl and amino functional groups contained in the modifier increase adsorption sites of the modifier to chloropropanol, and the specific combination mode of the banana peel and the chitosan acetic acid solution makes the functional groups on the composite adsorbent fully utilized, so the adsorption capacity of the composite adsorbent to the chloropropanol is improved, and the effect of removing the chloropropanol in the polyamide epichlorohydrin papermaking wet strength agent is significant; and the banana peel is natural, green and non-toxic and does not cause secondary pollution to the wet strength agent, meanwhile, the resource utilization efficiency of agricultural and sideline products can be improved by using the banana peel, and wide application prospects are achieved.

The application relates to the technical field of polyester fibers, and discloses a preparation method of antibacterial modified polyester hollow fibers; the preparation method takes nitrilotriacetic acid, chlorosulfoxide, epoxy chloropropane, eugenol and the like as raw materials, and obtains eugenol epoxy quaternary ammonium salt through acyl chloride reaction, quaternary ammonium reaction and esterification. The carboxyl groups in graphene oxide and the epoxy groups in eugenol epoxy quaternary ammonium salt are used to carry out ring-opening reaction, so that modified graphene is obtained; the modified graphene is uniformly mixed with polyethylene terephthalate, and through a series of steps, finally, the antibacterial modified polyester hollow fibers are obtained. The eugenol and quaternary ammonium salt are used to improve the antibacterial performance of the polyester hollow fibers, and the graphene is used to improve the mechanical performance of the polyester hollow fibers. The polyester hollow fibers prepared by the method have excellent mechanical performance and antibacterial performance.

The invention provides a natural polymer shear strength improving agent for temperature-resistant tackifying water-based drilling fluid as well as a preparation method and application of the natural polymer shear strength improving agent. The shear strength improving agent is prepared from the following raw materials in parts by mass: 1 to 7 parts of carboxymethyl starch, 1 to 5 parts of 2-acrylamido-2-methylpropanesulfonic acid, 1 to 5 parts of dimethyl diallyl ammonium chloride, 1 to 5 parts of N-vinyl pyrrolidone, 1 to 5 parts of acrylamide, 0.01 to 0.05 part of an initiator I, 0.01 to 0.05 part of an initiator II, 0.01 to 0.07 part of a cross-linking agent epoxy chloropropane, 50 to 70 parts of water and 150 to 220 parts of absolute ethyl alcohol. According to the shear strength improving agent, natural high polymer materials are used, a polymer net structure is formed through polymerization reaction, the cross-linking agent is used for promoting the net structure to be tighter for tackifying, and the shear strength improving agent has better thermal stability, dynamic shear force, flocculation capacity and suspension stability while the cost and the environmental load are reduced.

The invention relates to a preparation method of 1, 1, 1, 2, 3-pentachloropropane and a catalyst, and the 1, 1, 1, 2, 3-pentachloropropane is obtained by carrying out chlorination reaction on 1, 1, 1, 3-tetrachloropropane and chlorine in the presence of a loaded zero-valent bimetallic nanoparticle catalyst and a cocatalyst. The zero-valent bimetallic nanoparticle loaded catalyst comprises a carrier and an active component loaded on the carrier, the active component comprises zero-valent Sb-Al nanoparticles or Sb-Fe nanoparticles, and the cocatalyst comprises alkyl phosphine, aryl phosphine or alkyl aryl phosphine. On one hand, the oxidation inactivation and agglomeration phenomena of the catalyst are avoided, the surface area of the active component of the catalyst is increased, and the reaction is facilitated; on the other hand, the catalytic activity of the bimetallic nanoparticle catalyst is improved by using the cocatalyst, the reaction activation energy is reduced, and the reaction rate and the reaction selectivity are improved.

The invention discloses a method for removing acrolein in an industrial epichlorohydrin production process. The method comprises the following steps: constructing an extraction-removal linkage circulating device comprising an extraction device, an acrolein removal reactor and a separation device; the method comprises the following steps: respectively introducing an oil-phase to-be-treated liquid obtained in an industrial epoxy chloropropane production process and a water-phase extraction agent into an extraction device, extracting, discharging an oil phase obtained after acrolein is extracted from the extraction device, and directly feeding into a downstream finished product tower; the method comprises the following steps: introducing an acrolein-extracted water phase into an acrolein removal reactor, adding a remover into the acrolein removal reactor, fully reacting, separating by a separation device, and directly returning the obtained water phase to an extraction device for recycling. According to the removal method disclosed by the invention, an extraction-removal linkage circulating device is directly introduced into an existing industrial production process flow, so that continuous production is ensured, and meanwhile, high-efficiency removal of acrolein and high yield of epichlorohydrin can be ensured.

The invention provides epoxy resin for halogen-free flame-retardant self-leveling powder coating and a preparation method of the epoxy resin, and belongs to the technical field of powder coating. The flame retardant is mainly prepared from anhydrous piperazine, bisphenol A diglycidyl ether, trihydroxymethyl phosphorus oxide, triethyl phosphite, epoxy chloropropane, sodium hydroxide, N-methyl iminodiacetic acid, ethylene glycol diglycidyl ether and other main raw materials through polymerization. The prepared epoxy resin and 2-phenylimidazoline are subjected to low-temperature curing (135 DEG C / 20 min) on the premise that an additional flatting agent does not need to be used, the flexibility of a coating film is good, the impact resistance grade is high, the impact performance reaches the condition that no cracking phenomenon exists in the front and back 60cm, the leveling grade reaches the grade 7 or above, the gloss is high and reaches 95% or above, the oxygen index reaches 34% or above, and the halogen-free flame retardant performance is excellent.

The invention relates to the technical field of adsorption material preparation, in particular to modified activated carbon for removing n-butane and a preparation method thereof.The preparation method comprises the following steps that S1, coconut shell charcoal is impregnated and activated, and activated activated carbon is obtained; s2, enabling the activated active carbon to react with polyethyleneimine and epoxy chloropropane to obtain polyethyleneimine-loaded active carbon; s3, dispersing the active carbon loaded with polyethyleneimine in DMF, adding EDC, NHS and 2, 5-bis (trifluoromethyl) terephthalic acid, and reacting to obtain functionalized active carbon; s4, reacting the sucrose modified molecular sieve with an aminated silane coupling agent to obtain a composite modified molecular sieve; s5, reacting the composite modified molecular sieve, the functionalized activated carbon and glutaraldehyde to obtain the modified activated carbon. The functionalized activated carbon and the composite modified molecular sieve are covalently linked through the chemical cross-linking agent to form multiple adsorption sites, so that the adsorption capacity of the modified activated carbon to n-butane is remarkably improved.

The invention belongs to the technical field of epoxy resin production, and particularly relates to a low-energy-consumption epoxy resin production process. The method comprises the following steps: firstly, mixing bisphenol A with epoxy chloropropane, and dissolving the bisphenol A by utilizing high-temperature steam and hot water linkage heating; then heating and adding a sodium hydroxide solution for pre-reaction; controlling pressure and temperature, and adding a sodium hydroxide solution for main reaction; after the reaction is completed, under different pressure and temperature conditions, recovering epichlorohydrin by using high-temperature steam, finally, ending recovery through low-temperature steam bubbling, cooling, then heating, adding benzyltriethylammonium chloride and a sodium hydroxide solution for reaction, carrying out water washing and liquid separation twice, and pumping residual toluene resin into a debenzolization kettle. And finally, debenzolization: completing toluene recovery and water removal by using low-temperature steam bubbling to obtain the product. According to the production technology, steam heat in the production process is fully utilized to obtain hot water for heat recycling, the energy utilization rate is greatly increased, operation is easy, and safety is high.

The invention relates to a preparation method of 1, 1, 1, 3, 3-pentachloropropane and a catalyst, in the presence of a loaded zero-valent bimetallic nanoparticle catalyst and a cocatalyst, carbon tetrachloride and vinyl chloride are subjected to an addition reaction to obtain 1, 1, 1, 3, 3-pentachloropropane, the zero-valent bimetallic nanoparticle loaded catalyst comprises a carrier and an active component loaded on the carrier; the active component is prepared from zero-valent Pd-Fe nano particles or Cu-Fe nano particles; the cocatalyst comprises boric acid ester or acetyl citrate. The preparation method of 1, 1, 1, 3, 3-pentachloropropane can effectively avoid easy agglomeration when only Fe powder is used as a catalyst, the specific surface area of the iron powder is increased, the reaction is promoted, meanwhile, the used cocatalyst is a nitrogen-free and phosphorus-free catalyst, emission of three wastes containing nitrogen and phosphorus is avoided, and the preparation method is environment-friendly.

The invention relates to production equipment and a production method of 1, 1, 1, 2, 3-pentachloropropane, and belongs to the technical field of preparation of chemical intermediates. According to the invention, 1, 1, 1, 3-tetrachloropropane is adopted as an initial raw material, 1, 1, 1, 2, 3-pentachloropropane is produced through dehydrochlorination and chlorination in the serial tower reactor, and compared with a traditional two-step synthesis process of 1, 1, 1, 2, 3-pentachloropropane, after dehydrochlorination of 1, 1, 1, 3-tetrachloropropane and a 1, 1, 3-trichloropropene chlorination system are coupled, the process flow is shortened; compared with the existing one-pot synthesis process, the reaction is easier to control; a fixed bed catalyst system is adopted, the problems that traditional anhydrous ferric chloride catalyst powder is not easy to add, poor in dispersity and frequent to add are solved, saponification salt-containing wastewater is not discharged, the process is green and environmentally friendly, and the application prospect is wide.

The invention provides halogen-free flame-retardant liquid epoxy resin, solid epoxy resin for powder coating and a preparation method of the solid epoxy resin, and belongs to the technical field of powder coating. The liquid epoxy resin disclosed by the invention is prepared by polymerizing 2, 4-diamino-6-phenyl-1, 3, 5-triazine, formaldehyde, triethyl phosphite, epoxy chloropropane, sodium hydroxide, DMF (Dimethyl Formamide) and the like. The contents of halogen-free flame-retardant elements nitrogen and phosphorus in the product are high, a solid epoxy resin product obtained by carrying out chain extension on liquid epoxy resin serving as a synthetic monomer of solid epoxy resin of the powder coating and bisphenol F is good in flame retardance, the oxygen index reaches 37% or above, and the flame retardance is high. A coating film obtained after the powder coating and an accelerated dicyandiamide curing agent are subjected to low-temperature rapid curing (150 DEG C / 10 min) is high in gloss and leveling grade and good in impact resistance, hardness and the like, and the application requirements of the powder coating are met.

The invention discloses a method for treating a metal surface through ethylene glycol butyl ether after a fire disaster. The treatment method comprises the following steps that modified ethylene glycol butyl ether is prepared; sequentially adding modified ethylene glycol butyl ether serving as a main chemical solution into the reaction kettle according to the quantitative percentage, and carrying out mixed reaction; standing the mixed chemical solution in the step S2 for 10-20 minutes, and adding water to dilute the mixed solution according to the remaining percentage of the volume of the reaction kettle; the ethylene glycol butyl ether is modified and serves as a main component of the cleaning solution, the sodium phosphate, the epichlorohydrin, the sodium pyrophosphate and the trichloroethylene are mixed according to a proper proportion, a proper amount of water is added for dilution, and the cleaning solution is obtained. Dirt formed by fire disasters on the metal surface can be effectively removed, and metal objects cannot be damaged.

The application relates to the field of epoxy resin modification, in particular to a preparation method of a self-emulsifying epoxy resin. The method overcomes the defects of the prior art, such as the need to add an emulsifier and mechanical stirring for emulsification, easy demulsification, low epoxy value and the like. The preparation method comprises the following steps: firstly, adding a Lewis acid into a mixed solution of polyethylene glycol and epoxy chloropropane to prepare one-side chlorinated polyethylene glycol; secondly, adding bisphenol A into the one-side chlorinated polyethylene glycol system to make the one-side hydroxyl group of the bisphenol A graft with polyethylene glycol through a Williamson ether reaction under the catalysis of alkali; and thirdly, adding epoxy chloropropane into the bisphenol A solution grafted with one-side polyethylene glycol to make the other-side hydroxyl group of the bisphenol A graft with an epoxy group under the catalysis of alkali, so as to prepare the epoxy resin with self-emulsifying effect. The raw materials of the reaction method are cheap and easy to obtain, the method is simple, the toxicity is relatively small, there is no by-product after the reaction is completed, and the environment pollution is relatively small. The reaction raw material utilization rate is high, the yield is high, the method meets the concept of green paint, and can be widely applied to the industrial production fields of paint and material.

The invention provides a method for separating chloropropene and chloropropane, which comprises the following steps of: (1) feeding circulating chloropropene into a coarse distillation tower for distillation separation to obtain chloropropene at the tower top, feeding a mixture flow obtained from a tower kettle into an extractive distillation tower from a feeding hole, performing extractive distillation on the mixture flow and an extracting agent, obtaining chloropropane at the tower top of the extractive distillation tower, and obtaining chloropropane at the tower bottom of the extractive distillation tower; obtaining a mixture flow of chloropropene and the extracting agent from the tower kettle; and (2) sending a mixture flow of chloropropene and the extraction agent obtained from the tower kettle of the extractive distillation tower to an extraction agent recovery tower for recovery, obtaining chloropropene from the tower top and obtaining the extraction agent from the tower kettle, and recycling the extraction agent to the extractive distillation tower. The circulating chloropropene is subjected to coarse rectification, extractive rectification and extraction agent recovery, so that the content of inert components in the circulating chloropropene is reduced, and the subsequent reaction efficiency is improved.

The invention discloses an azeotrope separation method, and belongs to the technical field of chemical engineering. The separation and purification method comprises the following steps: adding an extracting agent into an azeotrope of 1-chloro-3, 3, 3-trifluoropropene and 1, 1, 1, 3, 3-pentachloropropane, and extracting the azeotrope of 1-chloro-3, 3, 3-trifluoropropene and 1, 1, 1, 3, 3-pentachloropropane; wherein the extracting agent is selected from one or more of ethylene glycol, furfural, acetonitrile and DMF (Dimethyl Formamide). According to the separation method disclosed by the invention, the azeotropic equilibrium between the 1-chloro-3, 3, 3-trifluoropropene and the 1, 1, 1, 3, 3-pentachloropropane is destroyed by adding the efficient, cheap and easily available extraction agent, so that the effective separation of the azeotrope of the 1-chloro-3, 3, 3-trifluoropropene and the 1, 1, 1, 3, 3-pentachloropropane is realized. And introducing the separated 1-chloro-3, 3, 3-trifluoropropene and 1, 1, 1, 3, 3-pentachloropropane into a subsequent rectification system for rectification and purification, and finally obtaining two products of high-purity 1-chloro-3, 3, 3-trifluoropropene and 1, 1, 1, 3, 3-pentachloropropane.

The present invention discloses a method for synthesizing epichlorohydrin. The method comprises the following steps: adding 3-chloropropylene and hydrogen peroxide to a solvent, adding an inorganic base to adjust the pH, and carrying out a reaction under the catalytic action of a modified titanium silicalite. The method can achieve a hydrogen peroxide conversion rate of over 99.5%, and an epichlorohydrin selectivity of over 99%.

The invention relates to the technical field of fine chemical engineering, and discloses electronic-grade solid naphthyl epoxy resin as well as a preparation method and application thereof.The preparation method specifically comprises the following steps: (1) firstly, adding epoxy chloropropane and isopropanol into dihydroxy dinaphthyl methane of two isomers, and stirring and dissolving to obtain a mixture A; (2) dropwise adding alkali liquor into the mixture A, and carrying out etherification reaction to obtain a mixture B; (3) dropwise adding alkali liquor into the mixture B, carrying out ring-closure reaction, separating liquid and removing salt to obtain an organic phase layer solution C; (4) washing the organic phase layer solution C with water, and performing reduced pressure distillation to obtain an epoxy resin crude product; (5) adding a solvent into the epoxy resin crude product, heating and dissolving, dropwise adding alkali liquor, carrying out refining reaction, separating liquid and removing salt to obtain an organic phase layer solution D; and (6) washing the organic phase layer solution D with water, and carrying out reduced pressure distillation to obtain the alpha-naphthol bifunctional solid epoxy resin. The product disclosed by the invention is low in total chlorine content, high in purity, relatively high in yield and excellent in heat resistance, and can be applied to the fields of epoxy resin molding compounds, semiconductor chip packaging and the like.

The application relates to the papermaking technical field, and particularly discloses a paper pulp papermaking reinforcing agent and a preparation method thereof, which comprises the following raw materials in parts by weight: polyamide epoxy chloropropane resin 10-20 parts, silicon dioxide 1-2 parts, polyvinyl alcohol 1-5 parts, crosslinking agent 0.1-1 part, deionized water 120-150 parts, modifier 0.5-2 parts, wherein the modifier contains fluorine elements, silicon elements and organic amine groups in a molecular structure, and the dry tensile property, the wet tensile property, the folding resistance, the flame resistance and the wet / dry tensile index ratio of the paper pulp reinforcing agent are improved, and the paper pulp papermaking reinforcing agent prepared by the application can be widely applied to paper strengthening and has a wide application prospect.