53 results about "Bromoethane" patented technology

The invention relates to the field of pouring sealants, and discloses a modified epoxy resin pouring sealant and a preparation method thereof, the pouring sealant comprises epoxy resin, a modified inorganic filler, a modified additive and an auxiliary agent; the modified inorganic filler is prepared by grafting a quaternized s-triazine derivative and an inorganic filler; the quaternized s-triazine derivative is prepared through the steps that 3, 5-diaminophenylboronic acid, cyanuric chloride, 3-chloropropyltrimethoxysilane and 1, 4-butanediamine are sequentially subjected to substitution to prepare a s-triazine derivative, then the s-triazine derivative reacts with N, N-dimethyl-1, 3-diaminopropane, and bromoethane is used for quaternization treatment. The modified additive is prepared from a modified bismaleimide monomer prepared from maleic anhydride and 5 (6)-amino-1-(4-aminophenyl)-1, 3, 3-trimethylindane and 1-methyl-4-isopropyl cyclohexene through a self-stabilization precipitation polymerization method, the prepared pouring sealant is high in tensile strength, good in impact resistance and good in mechanical property, and the prepared pouring sealant has the advantages of being good in mechanical property, good in mechanical property and good in mechanical property. Meanwhile, good heat resistance, flame retardance, dielectricity and antibacterial activity are achieved.

The invention belongs to the technical field of drilling fluid additives for petroleum drilling, and discloses a heat-resistant water-based drilling fluid additive as well as a preparation method and application thereof. The water-resistant water-based drilling fluid additive is a high-molecular compound which is formed by taking water as a solvent, dissolving animal bone glue to form a glue solution, and performing etherification reaction on the glue solution and bromoethane under the action of a chain transfer agent and a base catalyst. The preparation method comprises the following steps: adding animal bone glue into water, dissolving to obtain a glue solution, sequentially adding sodium hydroxide, sodium carbonate and bromoethane to form a reaction system solution, then adding a chain transfer agent, and heating and refluxing to react to obtain the water-resistant water-based drilling fluid additive. According to the prepared bromoethane modified bone glue, the chain transfer agent is added in the modification process, the technical defect that the molecular weight of the bone glue cannot be manually controlled is overcome, the inhibition effect is obvious, meanwhile, the rheological property of drilling fluid is not affected, and the problems of borehole wall instability and the like caused by shale hydration expansion in the drilling process can be effectively solved.

The invention provides a preparation method of N, N-diisopropylethylamine based on a liquid-phase compression synthesis process, which comprises the following steps: mixing ethanol with hydrobromic acid with specified concentration, and carrying out reactive distillation treatment in the presence of a phase transfer catalyst to generate bromoethane; p-bromoethane and diisopropylamine are subjected to a liquid phase addition and compression combination reaction, and a reaction mixture is obtained; and sequentially neutralizing, distilling, condensing and filtering the reaction mixture to obtain the N, N-diisopropylethylamine, so as to solve the problems that the existing preparation method of the N, N-diisopropylethylamine is high in energy consumption, high in operation risk, large in pollutant discharge amount, low in by-product resource utilization rate, low in cost and the like. The safety is poor; the energy efficiency is low; and by-products cannot be recycled.

The application discloses a preparation method of ammonium glufosinate, which comprises the following steps: adding diethyl malonate and liquid bromine into a first solvent to react to obtain intermediate I; adding the intermediate I, potassium phthalimide and a quaternary ammonium salt catalyst into toluene to react to obtain intermediate II; adding the intermediate II, potassium carbonate, 1,2-dibromoethane and a phase transfer catalyst into a second solvent to react to obtain intermediate III; adding the intermediate III and diethyl methyl phosphonite into toluene to react under argon to obtain intermediate IV; adding the intermediate IV into hydrochloric acid to react under reflux; cooling, precipitation, drying to obtain intermediate V; mixing the intermediate V with water, passing in ammonia and adjusting pH value; adding methanol and stirring to react; cooling, filtering and drying to obtain ammonium glufosinate. The method can avoid using sodium cyanide or hydrocyanic acid, and no large amount of difficult-to-separate ammonium chloride is generated, the content of the obtained ammonium glufosinate is 90% to 98%, and the total yield is greater than 68%.

The invention belongs to the field of chemical homogeneous catalysis technology and chemical process, and provides an imidazolyl basic ionic liquid catalyst, and a preparation method and application thereof. The catalyst provided by the invention is obtained by carrying out quaternization reaction on N-methylimidazole and halogenated hydrocarbon (such as methyl iodide, bromoethane and the like) in a solvent to generate an intermediate halogen quaternary ammonium salt, and then carrying out ion exchange reaction on the intermediate, sodium hydroxide and an imidazole derivative (such as imidazole or 2-methylimidazole) in the solvent. The catalyst can be applied to catalysis of transesterification of methanol and propylene carbonate to prepare dimethyl cyclic carbonate, and has the advantages of efficient preparation process, mild reaction conditions, no metal, no pollution and simple catalytic system, and the highest yield of dimethyl carbonate can reach 95%.

This invention provides an N,N-diethylpyrrolidine difluorosulfonylimide salt, its preparation method, and its applications, belonging to the field of ionic liquid materials technology. The preparation method of the N,N-diethylpyrrolidine difluorosulfonylimide salt of this invention includes the following steps: reacting potassium carbonate solution, tetrahydropyrrole, and bromoethane in an inert atmosphere; then dissolving the reaction product in an organic solvent, filtering, and evaporating to obtain N,N-diethylpyrrolidine bromide; dissolving the N,N-diethylpyrrolidine bromide in water, adding activated carbon for decolorization treatment, to obtain an aqueous solution of N,N-diethylpyrrolidine bromide; and subjecting the aqueous solution of N,N-diethylpyrrolidine bromide to an ion exchange reaction with lithium difluorosulfonylimide in an organic solvent to obtain the final product. The preparation method of this invention separates the reaction product and byproduct into liquid and solid phases, and the reaction does not introduce other impurity ions, greatly improving the purity of the product.

This invention relates to the field of flocculant technology, and discloses a polyacrylamide flocculant for sludge treatment and its preparation process. The polyacrylamide flocculant for sludge treatment prepared by this invention comprises the following raw materials: water, modified starch, prepolymer, and bromoethane; the prepolymer includes butyl acrylate, water, sodium dodecyl sulfate, acrylamide, N,N-methylenebisacrylamide, glycidyl methacrylate, modified silica, ammonium persulfate, and sodium bisulfite; the modified silica includes vinyltriethoxysilane-modified nano silica; the modified starch includes corn starch, N,N'-(1,2-ethanediyl)bisaspartic acid, sodium alginate, water, sodium sulfate, and phosphorus oxychloride; the obtained polyacrylamide flocculant for sludge treatment has a high molecular weight hyperbranched structure and good flocculation effect.

The invention discloses a preparation method of 2, 2 '-bis (trifluoromethyl) biphenyl. The invention specifically discloses a preparation method of 2, 2 '-bis (trifluoromethyl) biphenyl, which comprises the following steps of: I, reacting o-chlorobenzotrifluoride with magnesium in a solvent in the presence of lithium chloride, ethyl magnesium bromide and bromoethane to obtain a Grignard reagent; and step II, in a mixed gas atmosphere of oxygen and nitrogen, in the presence of ferric trichloride, carrying out a self-coupling reaction on the Grignard reagent obtained in the step I to obtain 2, 2 '-bis (trifluoromethyl) biphenyl. The raw materials in the synthesis route are cheap and easy to obtain, particularly, the green, cheap and easy-to-obtain mixed gas of oxygen and nitrogen is adopted as the oxidizing agent, and the process yield is high.

The invention discloses a combined antibacterial cationic covalent organic polymer and application thereof, and belongs to the technical field of biological medicines. The cationic covalent organic polymer is obtained by taking tris (6-methyl-2-pyridyl) phosphine as a phosphorus-containing monomer, ferrocene dicarboxaldehyde as a photo-thermal active unit and bromoethane as a quaternization reagent and carrying out ternary polymerization through a Williamson synthesis reaction. The preparation method comprises the following steps: firstly, preparing a polymer precursor, then preparing a metallized cation organic framework (iFc-POP) with good photo-thermal and photodynamic activity through ethylation and metal insertion modification, and enhancing the antibacterial effect of the polymer through the synergistic effect of cation adsorption, photo-thermal heating and multiple enzyme activities. The antibacterial material can effectively penetrate through a mature biological membrane for sterilization, and a new thought is provided for practical application of the antibacterial material.

The invention discloses a separation and purification device for tetrabromoethane production, and relates to the technical field of tetrabromoethane production equipment.The separation and purification device comprises a distillation mechanism, a separation mechanism, a condensation mechanism and a collection mechanism, the separation mechanism comprises a separation box, a movable sliding seat, a movable sliding frame and an activated carbon plate, and an air inlet groove communicated with an exhaust port is formed in the bottom of the separation box; a first sliding groove is formed in the inner side of the separation box, the movable sliding base is connected with the first sliding groove in a sliding fit mode, the bottom of the movable sliding frame abuts against the top of the air inlet groove, the side portion of the movable sliding frame is fixedly connected with the movable sliding base, and the activated carbon plate is arranged in the movable sliding frame. And the steam uniformly passes through each area of the activated carbon plate. Therefore, the activated carbon can give full play to the adsorption performance, pigments, peculiar smell and various impurity gases in the steam are continuously and efficiently removed, and the separation and purification degree of the tetrabromoethane steam is greatly improved, so that the high stability of the product quality is ensured.

The invention provides preparation and application of a low-linear-expansion naphthyl amine curing agent, which are characterized in that firstly, iron powder and excessive HCl solution are added into 2-nitronaphthalene for chemical reduction reaction to generate 2-naphthylamine; the preparation method comprises the following steps: reacting 2-naphthylamine with acetyl chloride under an anhydrous condition, carrying out acetylation protection on amino groups to generate N-acetyl-2-naphthylamine, adding bromoethane into the N-acetyl-2-naphthylamine, then carrying out Friedel-Crafts alkylation reaction on the N-acetyl-2-naphthylamine and bromoethane under the catalysis of anhydrous AlCl3, introducing ethyl groups at the 1-position and the 3-position of a naphthalene ring, and then removing acetyl protection to obtain 1, 3-diethyl-2-naphthylamine; the preparation method comprises the following steps: carrying out an intermolecular Friedel-Crafts alkylation reaction on 1, 3-diethyl-2-naphthylamine and 1, 2-dichloroethane under the catalysis of anhydrous AlCl3 to obtain a low linear expansion naphthylamine curing agent 1, 2-bis (1, 3-diethyl-2-naphthylamine) ethane; compared with an original curing agent, low expansion is guaranteed, and meanwhile high heat resistance is also achieved.

The application provides a quick-dissolving ternary copolymer emulsion type fracturing fluid thickening agent and a preparation method, and relates to the field of oil and gas exploitation. N,N,N'-trimethyl-N'-allyl ethylenediamine (TMPEMA) is prepared by reacting chloropropylene with N,N,N'-trimethyl ethylenediamine, and (N,N-dimethyl-N-ethyl-N'-allyl-N'-methyl-N'-ethyl)-ethyldibromide functional monomer is prepared by reacting TMPEMA with bromoethane. A monomer solution is prepared by using acrylamide, sodium p-styrene sulfonate and the functional monomer as an aqueous phase, using an emulsifier and liquid paraffin as an oil phase, slowly adding the aqueous phase into the oil phase, stirring uniformly under N2, and then adding an initiator drop by drop to perform inverse emulsion polymerization, so as to prepare the fracturing fluid thickening agent. The ternary copolymer fracturing fluid thickening agent has excellent viscosity increasing property, quick-dissolving capacity, salt resistance, temperature resistance and shear resistance. The prepared fracturing fluid has good viscoelasticity, gel breaking property, sand carrying property, filtration loss reducing property and the like, can be used as slick water at a low concentration and can be used as a sand carrying liquid at a high concentration, and has a good application prospect in offshore and shale oil and gas development.

The invention discloses an industrial preparation method of metafluzamide, which comprises the following steps: step S1, reacting 4-aminopyridazine with bromoethane in the presence of a catalyst 4, 7, 13, 16, 21, 24-hexaoxo-1, 10-diazabicyclo [8.8. 8] hexacodecane and an acid binding agent to obtain N-ethylpyridazine-4-amine, and step S2, reacting 4-aminopyridazine with bromoethane in the presence of a catalyst 4, 7, 13, 16, 21, 24-hexaoxo-1, 10-diazabicyclo [8.8. 8] hexacodecane to obtain N-ethylpyridazine-4-amine; s2, reacting methyl isopropyl ketone with hydrazine hydrate to obtain 3-methylbutyl-2-subunit hydrazine, carrying out reduction reaction on the 3-methylbutyl-2-subunit hydrazine to obtain 3-hydrazino-2-methyl butane, and carrying out cyclization reaction on the 3-hydrazino-2-methyl butane and the compound as shown in the formula 1 in the presence of formic acid to obtain a compound as shown in a formula 2; s3, enabling the N-ethylpyridazine-4-amine to react with the compound shown in the formula 2 under the catalytic action of 2, 2, 2-trifluoroethanol, so as to obtain the metafluzamide. According to the present invention, the method has characteristics of simple steps, easily available raw materials, mild reaction conditions and high total yield, and is suitable for industrial production.

The present invention relates to the field of adhesive technology and discloses a weather-resistant antibacterial adhesive and its preparation method. The preparation method comprises: reacting a zinc oxide / carbon nitride composite material with ethyl bromide, followed by further reaction with methyl iodide to obtain an antibacterial agent; mixing modified imidazole, pentaerythritol triacrylate, and hydroxyethyl methacrylate to obtain a modified acrylate monomer; reacting a polyurethane prepolymer with the modified acrylate monomer to obtain a modified polyurethane acrylate; and mixing the modified polyurethane acrylate, glycidyl methacrylate, trimethylolpropane triacrylate, acetone, an antibacterial agent, and a photoinitiator to obtain a weather-resistant antibacterial adhesive.

The application relates to an adsorptive retarder, a self-generating acid plugging removal fluid and a preparation method thereof, and belongs to the technical field of oil and gas development. The preparation method of the adsorptive retarder comprises the following steps: S1. n parts of polyethylene imine are dissolved in a solvent, and then 2x parts of bromoethane are added dropwise for reaction; S2. triethylamine is added and stirred uniformly, and then y parts of diethyl phosphinite are added dropwise for reaction; S3. the reaction product prepared in the step S2 is distilled under reduced pressure, hydrolyzed, and then precipitated, washed and dried. According to the mass percentage, the self-generating acid plugging removal fluid comprises 0.3%-2.0% of the adsorptive retarder, 15%-40% of a live acid agent, 5%-15% of a fluorine source, 0.8%-3.0% of a corrosion inhibitor, 0.5%-2.5% of an iron ion stabilizer and 0.5%-1.0% of a cleanup agent, and the rest is water. The plugging removal fluid can not only inhibit corrosion of the pipe column at high temperature, but also control the acid-rock reaction rate, maximally protect the rock matrix, avoid waste of the acid liquid, force the acid liquid to penetrate into the deep stratum and realize efficient and accurate removal of the plugging material.

The present invention discloses a cationic surfactant and its preparation and application. The structure of the cationic surfactant is: #imgabs0# A method for preparing the cationic surfactant comprises: (1) reacting dehydroabietic acid with thionyl chloride under the catalysis of 4-dimethylaminopyridine to obtain dehydroabietic acid chloride; (2) reacting dehydroabietic acid chloride with aminoundecanoic acid methyl ester hydrochloride to obtain compound 1; (3) reacting compound 1 with 3-dimethylaminopropylamine to obtain compound 2; and (4) reacting compound 2 with ethyl bromide to obtain the cationic surfactant. The cationic surfactant provided by the present invention can have high viscoelasticity at a relatively low concentration and has low application cost.

The present disclosure provides a method to form 1,2-dibromoethane in an electrochemical reactor system. The electrochemical reactor system comprises an electrochemical cell having an anode, an anolyte, a cathode, a catholyte and a membrane, an anode compartment and a cathode compartment, wherein the anolyte is an aqueous solution comprising at least 20 mM bromide salt. The method comprises the steps of introducing carbon dioxide into the cathode compartment; applying a potential to the cathode, and allowing an electrochemical reaction to proceed forming reduction products at the cathode and oxidation products at the anode; and bringing the reduction products in contact with the oxidation products externally from the electrochemical cell and allowing the reduction products to react with the oxidation products to form 1,2-dibromoethane.

The invention relates to a selective hydrogenation reduction method of a non-conjugated ketene compound, which comprises the following steps: in a nitrogen atmosphere, mixing a ketene compound shown as a formula (I), a hydrogen source, a catalyst, a ligand, a reducing agent and an organic solvent, and stirring at room temperature for 8-24 hours to obtain a reaction solution; and performing column chromatography separation and purification on the reaction liquid to obtain the alkyl ketone compound as shown in the formula (II). According to the method, iodoethane or bromoethane is used as a hydrogen source, and compared with the prior art, the method has the advantages of higher yield, mild reaction conditions, good selectivity, no need of high-pressure hydrogen, no pungent smell and environmental protection.

The invention discloses a preparation method capable of improving the yield of trifluoroethylene, which comprises the following steps: in the presence of an organic solvent, mixing 1-chloro-1, 2-dibromo-1, 2, 2-trifluoroethane, a metal dehalogenating agent and an activating agent for reaction, then cooling and dropwise adding water into the reaction system to obtain trifluoroethylene, the activating agent is 1, 2-dibromo-1, 2, 2-trifluoroethane, and the metal dehalogenating agent is 1, 2-dibromo-1, 2, 2-trifluoroethane. The catalyst is selected from at least one of 1, 2-dibromoethane, bromoethane and dichloroethane. An activating agent is added into a reaction system, the activating agent serves as an efficient initiator, the activating agent is heated to decompose and release free radicals, the free radicals reduce oxides on the surface of a metal dehalogenating agent, reaction active sites of the metal dehalogenating agent are exposed, reaction of 1-chloro-1, 2-dibromo-1, 2, 2-trifluoroethane and the metal dehalogenating agent is facilitated, and the metal dehalogenating agent can be used for dehalogenating 1-chloro-1, 2-dibromo-1, 2, 2-trifluoroethane. Therefore, the conversion rate of the reaction is effectively improved, and the yield of trifluoroethylene is improved.

The invention belongs to the field of fluorine chemical industry, and particularly relates to a synthesis method of 1, 1, 1, 2, 2, 5, 5, 6, 6, 6-decafluoro-3-hexene. The preparation method comprises the following steps: 1, carrying out addition reaction on pentafluoro halogenated hydrocarbon such as pentafluoro iodoethane or pentafluoro bromoethane serving as a raw material and ethylene, carrying out dehydrohalogenation to obtain 3, 3, 4, 4, 4-pentafluoro butene, carrying out addition reaction on the 3, 3, 4, 4, 4-pentafluoro butene and the pentafluoro halogenated hydrocarbon, and carrying out dehydrohalogenation to obtain 1, 1, 1, 2, 2, 5, 5, 6, 6, 6-decafluoro-3-hexene. And the other method comprises the following steps of: reacting pentafluoro halogenated hydrocarbon serving as a raw material with acetylene to obtain 3, 4-dibromo (diiodo)-1, 1, 1, 2, 2, 5, 5, 6, 6, 6-decafluoro-hexane, and removing bromine or iodine to obtain 1, 1, 1, 2, 2, 5, 5, 6, 6, 6-decafluoro-3-hexene. The synthesis method provided by the invention has the advantages of easily available raw materials, simple operation, convenient purification and easy large-scale production.

The invention belongs to the technical field of lithium metal battery electrolyte, and provides low-volatility electrolyte suitable for a high-temperature and high-capacity lithium battery and a preparation method of the low-volatility electrolyte. Firstly, 1-ethylimidazole is prepared through an alkylation reaction of imidazole and bromoethane and further reacts with 3, 3, 3-trifluoropropyl bromide and 2-chloroethanol methyl ether, a trifluorogroup and an ether group structure are combined in the molecular design of the ionic liquid, and the vapor pressure of an electrolyte is reduced by introducing the trifluorogroup, so that the volatility under a high-temperature condition is inhibited, and the performance of the electrolyte is improved. Oxygen atoms in ethanol methyl ether groups react with metal lithium to generate stable lithium alkoxide, so that a compact and stable solid electrolyte interface film can be formed on the surface of the negative electrode; secondly, the sulfonic acid group can promote the formation of a high-quality solid electrolyte interface film on the surface of the negative electrode through strong interaction with lithium ions, so that the growth of lithium dendrites is inhibited, and the phosphate group inhibits electrolyte decomposition under a high-temperature condition through the chemical stability of the phosphate group.

The application provides an acrylic metal salt resin containing rosin and rosin-derived quaternary ammonium salt and a preparation method and application thereof, and relates to the technical field of organic polymer materials. The acrylic metal salt resin is prepared by the following preparation method: rosin, maleic anhydride, p-toluenesulfonic acid and acetic acid are mixed and heated to reflux to obtain maleopimaric acid; maleopimaric acid, alcohol and N, N-dimethylethylenediamine are mixed and heated to obtain a product precursor; the product precursor is mixed with tetrahydrofuran and bromoethane to obtain rosin-derived quaternary ammonium salt; acrylic ester monomers, acrylic acid and methacrylic acid are mixed to obtain a monomer mixture; the monomer mixture is mixed with an initiator, a solvent and a chain transfer agent to carry out polymerization and obtain a resin prepolymer; and then a metal-containing compound, rosin, a small-molecule organic acid, a solvent and rosin-derived quaternary ammonium salt are mixed to obtain the acrylic metal salt resin with antibacterial and anti-protein adsorption properties.

The invention relates to the field of vitamin C derivatives, in particular to a preparation method of vitamin C ethyl ether, which comprises the following steps: step 1, preparing an intermediate I from vitamin C and 2, 2-dimethoxypropane under the catalytic action of perfluorosulfonic acid resin; step 2, adding the intermediate I and bromoethane into an organic solvent, then adding an acid-binding agent and a catalyst sodium bromide, and reacting to obtain an intermediate II; and step 3, adding an alcohol solvent into the intermediate II, adding the catalyst separated in the step 2, dropwise adding glacial acetic acid, and synthesizing to obtain the vitamin C diethyl ether. According to the method, two recoverable catalysts are used, and the vitamin C diethyl ether is obtained through reaction, so that the reaction time is greatly shortened, few byproducts are produced, the yield is high, and the product purity is higher.

The invention relates to the technical field of ionic liquid, in particular to allyl flexible ionic liquid and a preparation method thereof. The name of the ionic liquid is 1-ethyl-4-allyl-1, 2, 4-triazolyl bromide, and the ionic liquid has a structural formula as shown in a formula (I) in the specification. The preparation method comprises the following steps: slowly adding 1, 2, 4-triazole and sodium methoxide into methanol, dropwise adding bromoethane, reacting, filtering, washing, carrying out rotary evaporation, and removing impurities; distilling and collecting a middle fraction, enabling the middle fraction to react with bromopropene, and performing rotary evaporation, washing and filtering to obtain 1-ethyl-4-allyl-1, 2, 4-triazolyl bromide; and carrying out vacuum drying to obtain the purified-1-ethyl-4-allyl-1, 2, 4-triazolyl bromine salt, and carrying out vacuum drying on the purified-1-ethyl-4-allyl-1, 2, 4-triazolyl bromine salt. (I)

The invention relates to an adsorption type retarder, a retarding type authigenic acid plug removal liquid and a preparation method of the retarding type authigenic acid plug removal liquid, and belongs to the technical field of oil and gas development. The preparation method of the adsorption type retarder comprises the following steps: S1, dissolving n parts of polyethyleneimine in a solvent according to the amount of substance, dropwise adding 2x parts of bromoethane, and reacting; s2, adding triethylamine, uniformly stirring, and dropwise adding y parts of diethyl phosphonite for reaction; and S3, carrying out reduced pressure distillation on the reaction product prepared in the step S2, hydrolyzing, precipitating, washing and drying. The retarding type self-acidogenic blocking removal liquid comprises the following components in percentage by mass: 0.3%-2.0% of the adsorption type retarding agent, 15%-40% of an acid generator, 5%-15% of a fluorine source, 0.8%-3.0% of a corrosion inhibitor, 0.5%-2.5% of an iron ion stabilizer, 0.5%-1.0% of a discharge aiding agent and the balance of water. The blockage removing liquid can be used for inhibiting corrosion of a tubular column at high temperature, controlling the reaction rate of acid rocks, protecting a rock matrix to the greatest extent, avoiding waste of acid liquid, forcing the acid liquid to penetrate into the deep part of a stratum, and realizing efficient and accurate removal of blockages.

The invention provides a method for detecting related substances in n-butyl bromide, which adopts a gas chromatographic method, and the chromatographic conditions are as follows: the chromatographic column is TM-624 (60m * 0.32 mm, 2 [mu] m), and the filler is 6%-cyanopropyl phenyl-94% dimethyl polysiloxane; the detector is a hydrogen flame ionization detector; the temperature programming condition is that the initial temperature is kept at 90 DEG C for 20 minutes, and the temperature is raised to 130 DEG C at the speed of 10 DEG C per minute and kept for 5 minutes; the temperature of a sample inlet is 210 DEG C; the temperature of a detector is 240 DEG C; the carrier gas is nitrogen; the split ratio is 1: 30; the sample injection volume is 1 microliter. The methodology verification shows that the detection method is good in specificity, durability and system applicability and high in repeatability and precision, and separation and detection of related substances such as bromo-iso-butane, bromo-sec-butane, n-butyl ether, bromoethane, bromopentane, n-butyl alcohol and bromo-tert-butane in bromo-n-butane can be achieved.

The invention discloses a negative ion enhanced antibacterial polymer fiber and a preparation method thereof, belongs to the technical field of fiber preparation, and is used for solving the technical problem that the antibacterial property and the tensile property of the antibacterial polymer fiber in the prior art need to be further improved. The method comprises the following steps: carrying out surface modification on modified acrylic fibers to obtain the antibacterial acrylic fibers, namely hybridizing an organic chain segment structure in acrylonitrile and methyl acrylate processes by preparing and using an antibacterial chain extender to obtain modified polyacrylonitrile, and carrying out melt spinning on the modified polyacrylonitrile and auxiliary materials to obtain the acrylic fibers, after ester groups on acrylic fibers are ammoniated through 4-allyl piperazine-1-amine, a double-bond structure is introduced, a phosphorus material is introduced through phosphorus-hydrogen addition, finally, quaternary ammonium salt and phosphonium salt are introduced to the surfaces of the fibers through bromoethane modification, and the high-performance antibacterial acrylic fibers are obtained.

The invention relates to the technical field of organic synthesis, and particularly discloses a synthetic method of 4-alkyl bromobenzene. The invention provides a synthetic method of 4-alkyl bromobenzene, which specifically comprises the following steps in sequence: sequentially adding raw materials, namely 4-alkylaniline, a bromide and a catalyst into a solvent acetonitrile, then reacting under a reflux or closed condition, and after the reaction is finished, carrying out post-treatment to obtain the 4-alkyl bromobenzene, the brominated substance is selected from one of bromoethane and 1, 2-dibromoethane; the catalyst is composed of potassium nitrate and sodium thiosulfate in a molar ratio of (0.5-1.5): (0.5-1.5); the molar ratio of the catalyst to the 4-alkylaniline is (0.01-0.1): 1. According to the technical scheme provided by the invention, 4-alkylbromobenzene is synthesized by adopting a one-step method, and the synthesis method is safe, environmentally friendly, low in cost and relatively high in yield of finished products.

The invention discloses a low-chlorine low-alkene tetrabromoethane synthesis method in the technical field of chemical synthesis, which comprises the following steps: synthesizing tetrabromoethane in a gas-liquid microporous continuous reactor by using a mixed gas of acetylene and nitrogen and bromine; a rotatable membrane assembly is arranged in a gas-liquid mixing through cavity of the gas-liquid microporous continuous reactor, the membrane assembly comprises a microporous membrane, a bromine inlet is connected with the gas-liquid mixing through cavity, a mixed gas inlet is connected with an inner side cavity of the microporous membrane, the gas-liquid mixing through cavity is connected to a tetrabromoethane collecting through cavity through a plurality of micropipes, and the tetrabromoethane collecting through cavity is connected with a gas inlet of the gas-liquid microporous continuous reactor. The reaction liquid leaves the device through a reaction liquid outlet, and the high-purity tetrabromoethane is obtained through alkali washing, water washing and adsorption of the reaction liquid after the reaction. Acetylene passes through membrane holes in the form of microbubbles, and forms a thickness lt with bromine on the surface of the membrane; a 10 [mu] m transient liquid film reaction zone; further addition reaction is completed in the microtube. The content of inorganic chloride, organic chloride and halogenated olefin in the finished product is low, and the quality of the product can be improved.

This invention relates to the field of organic synthesis reagent preparation technology, specifically to a novel Grignard preparation with activation system and its preparation method. The raw material composition includes: 1 mol of magnesium, 1.05 mol-1.35 mol of haloalkanes, 0.5 mmol-1.8 mmol of 1,2-dibromoethane, 0.3 mmol-0.9 mmol of cuprous iodide, and a mixed solvent of ethers and aromatics; the magnesium raw material is large-particle magnesium or magnesium ingots. This invention constructs a synergistic system of composite chemical activation and ultrasonic physical activation, efficiently breaking down the oxide passivation layer on the magnesium surface, significantly improving reaction activation efficiency, shortening the reaction start-up cycle, and making the reaction start-up faster and more stable.