123 results about "Nitroaniline" patented technology

The invention discloses a crystallization process of o-chloro-p-nitroaniline, which comprises the following steps: feeding a material into a crystallization kettle to crystallize the o-chloro-p-nitroaniline, regulating and controlling the temperature in the kettle body in the crystallization process, cooling to a metastable region of the o-chloro-p-nitroaniline, preserving the heat in the metastable region for a first preset time length, and then cooling to a second preset time length; continuously cooling to a first temperature lower than the melting point of the o-chloro-p-nitroaniline, keeping the temperature at the first temperature for a second preset duration, continuously cooling to a second temperature, and outputting the material out of the crystallization kettle for filtration and separation; in the cooling process, the cooling speed in the kettle body is controlled to be 0.1-0.2 DEG C / min. According to the invention, the interior of the kettle body can be slowly cooled, and the cooling speed of each part in the kettle body can be more uniform, so that the crystallization purity and the product quality of o-chloro-p-nitroaniline are finally improved.

The invention discloses a preparation method of regenerated polyester fibers, and relates to the technical field of polyester fibers. According to the invention, (4-formylphenyl) phosphonic acid and 2-(3-nitroaniline) acethydrazide are combined to form a Schiff base structure, so that an antibacterial effect is realized, and meanwhile, phosphorus is introduced, so that flame-retardant and anti-wear effects are realized; then, a modified wear-resistant agent with a cross-linked network structure is formed with butanediol, so that the wear-resistant effect of the fiber is remarkably enhanced; then 1, 7-octadiene-3-alcohol and octylene trichlorosilane are copolymerized to prepare a modifier, a cross-linked network structure is formed, the wear-resistant effect is enhanced, meanwhile, flame combustion can be inhibited, and the flame-retardant effect is achieved; then, the hydroxylated carbon nanotubes attract a modifier to be subjected to in-situ polymerization on the surfaces of the hydroxylated carbon nanotubes to prepare modified carbon nanotubes, so that the dispersity of the carbon nanotubes is improved, fiber falling is prevented, and the wear resistance of the material is improved; finally, the regenerated polyester fibers, the modified wear-resistant agent and the composite modified carbon nanotubes are mixed, melted and spun, so that the wear-resistant, antibacterial and flame-retardant effects are achieved.

The invention relates to the technical field of chemical synthesis, and particularly discloses a synthesis method of 2-fluoro-3-nitrobenzoic acid. The preparation method comprises the following steps: by taking 2-methyl-6-nitroaniline as an initial raw material, firstly preparing aromatic diazonium salt through diazotization reaction, and then carrying out Balz-Schiemann reaction on the aromatic diazonium salt and fluoboric acid under the condition of a specific catalyst, so as to prepare the 2-fluoro-3-nitrotoluene. And finally, under the condition of a specific catalyst, carrying out oxidation reaction on the 2-fluoro-3-nitrotoluene to prepare the 2-fluoro-3-nitrobenzoic acid. The white 2-fluoro-3-nitrobenzoic acid with the total yield being 85% or above and the purity being 99% or above is finally prepared, the method has the advantages of being low in production cost, high in process safety and the like, large-scale production of the 2-fluoro-3-nitrobenzoic acid is easily achieved, and the method has very important significance for widening the application range of the 2-fluoro-3-nitrobenzoic acid.

The invention discloses a method for synthesizing L-γ-glutamyl-3-carboxyl-4-nitroaniline ammonium salt, and relates to the technical field of organic synthesis. According to the invention, Glupa-C is synthesized by using 5-amino-2-nitrobenzoic acid and 3-nitrophthaloyl-L-glutamic anhydride as starting materials through a condensation reaction and a hydrazinolysis reaction under the catalytic action of a Lewis acid. Compared with traditional alkaline preparation conditions, the use of highly toxic reagents and the safety hazard of explosion during the preparation process are avoided, production risks are reduced, and energy consumption is lowered. In addition, the synthesis method provided by the invention can achieve a total yield of 47.8% and a purity of 99.96% for the product Glupa-C, and is suitable for industrial production.

The utility model discloses a 2, 6-dichloro-p-nitroaniline separating device which comprises a device main body, a stirring assembly and an inflating assembly, and the stirring assembly is mounted in the middle of the top wall of the device main body; the stirring assembly comprises a driving motor, the output end of the driving motor is in transmission connection with a rotating shaft, stirring blades are installed on the rotating shaft, and an inflation assembly is installed in the inner cavity of the device body outside the stirring blades. The inflation assembly comprises an annular air pipe, the outer wall of the annular air pipe is communicated with an air outlet, the annular air pipe is communicated with an air inlet pipe through a connecting pipe, and a first valve is installed on the air inlet pipe. The problems that in the prior art, although the reaction kettle can improve the uniformity of chlorination synthesis during use, the branch pipes are only arranged at the lower section of the main pipe and can only stir materials at the bottom of the kettle body, and the mixing speed can be increased only by enabling the kettle body to move up and down in a reciprocating mode through springs and air cylinders outside the kettle body, so that time is wasted are solved.

The invention belongs to the technical field of catalysts, and particularly relates to a formaldehyde removal catalyst and a preparation method and application thereof. The formaldehyde removal catalyst is prepared by carrying out hydrothermal reaction and roasting treatment on a mixture of the following raw materials: metal salts including Mn salt, Co salt and Fe salt; an organic precursor, wherein the organic precursor comprises 2-nitroaniline and carboxymethyl cellulose; wherein the molar ratio of the Mn element to the Co element to the Fe element in the metal salt is (4.5 to 5.0): (2.0 to 2.5): (1.5 to 1.8); the ratio of the total mass of the Mn element, the Co element and the Fe element in the metal salt to the mass of the organic precursor is (80-85): (15-20). According to the formaldehyde removal catalyst, the metal elements are loaded on the hydrophobic carbon layer of the nitrogen-containing structure, so that the problem that the toluene adsorption capacity is weak due to the fact that a traditional catalyst does not have specific sites is solved, and the problem that the catalyst is inactivated due to the fact that multiple pollutants compete for active sites and a product overflows slowly can also be solved.

The invention discloses a preparation method of a regenerated polyester fiber, and relates to the technical field of polyester fibers. The present invention first utilizes (4-formylphenyl) phosphonic acid to combine with 2-(3-nitroaniline) acetohydrazide to form a Schiff base structure, achieves antibacterial effect, and simultaneously introduces phosphorus element to achieve flame retardant and anti-wear effect; then forms a modified wear-resistant agent of a cross-linked network structure with butanediol, significantly enhancing the wear-resistant effect of fiber; then utilizes 1,7-octadiene-3-ol and octene trichlorosilane copolymerization to make a modifier, form a cross-linked network structure, enhance wear-resistant effect, and simultaneously be able to suppress the burning of flame, achieve flame retardant effect; then attracts the modifier by hydroxylated carbon nanotubes to prepare modified carbon nanotubes in situ polymerization on its surface, improve carbon nanotube dispersibility, prevent fiber from falling off, and improve the wear resistance of material; finally, regenerated polyester fiber, modified wear-resistant agent, and composite modified carbon nanotube are mixed and melt-spun to achieve wear-resistant, antibacterial, flame-retardant effect.

The present invention relates to the technical field of fine chemical synthesis, and particularly discloses a continuous ammonolysis method for mixed nitrochlorobenzene. The continuous ammonolysis method for mixed nitrochlorobenzene is characterized in that: the mixed nitrochlorobenzene is continuously added to the primary ammonolysis kettle, and is mixed countercurrently with ammonia water and a catalyst from the subsequent ammonolysis kettle to carry out an ammonolysis reaction. The reaction liquid enters the separator at the upper part of the kettle through a lift. A part of the liquid material is refluxed into the reaction zone at the lower part of the kettle, and after the organic phase and the ammonia water phase are separated in the separator for the other part of the liquid material, the organic phase flows into the subsequent ammonolysis kettle to continue the ammonolysis reaction; until the reaction and separation are completed in the last ammonolysis kettle to obtain a crude product of mixed nitroaniline, which enters the refining section for refining. The present invention can reduce the consumption and circulation amount of concentrated ammonia water, realize the efficient conversion of mixed nitrochlorobenzene under relatively mild reaction conditions, effectively inhibit side reactions such as hydrolysis and coking, and at the same time reduce material consumption and energy consumption, and increase the economy of the reaction.

The invention relates to a method for preparing a 4-chloro-3-nitroanisole compound, in particular to a method for preparing a 4-chloro-3-nitroanisole compound by using a microreactor, which comprises the following steps: carrying out a raw material diazotization reaction by using the microreactor, then carrying out a chlorination reaction in an intermittent tank reactor, and taking 2-methoxy-4-nitroaniline as a raw material to prepare the 4-chloro-3-nitroanisole compound. The 4-chloro-3-nitroanisole compound is prepared from sodium nitrite and cuprous chloride. According to the invention, diazotization of 4-chloro-3-nitroanisole is realized on the micro-reaction device, and the method has the advantages of simple process, continuous production, small reaction volume, short reaction time, small corrosion to equipment, high operation safety and the like. Meanwhile, by utilizing the characteristics of high-efficiency heat mass transfer capacity and easiness in direct amplification of the microchannel reactor, the yield is high and is 80-85%, the product quality is good, the energy consumption is low, and the method is a green, environment-friendly and high-efficiency method for preparing the 4-chloro-3-nitroanisole and is suitable for industrial application.

The invention discloses a synthesis method of 5-nitro-2-aminophenol, which comprises the following steps: by using 2-chloro-4-nitroaniline as a raw material, providing an amino protecting group by using di-tert-butyl dicarbonate ester to obtain a compound 3; carrying out hydrolysis reaction in an alkaline environment to hydrolyze chlorine groups on benzene rings into hydroxyl groups to obtain a compound 4; and removing an amino protecting group under an acidic condition to obtain the 5-nitro-2-aminophenol. According to the method, 2-chloro-4-nitroaniline is used as a starting raw material, compared with expensive ortho-aminophenol, the cost of the raw material can be remarkably reduced, use of expensive catalysts in the hydrolysis process is avoided through amino protection, generation of the byproduct 2-amino-4-nitrophenol is effectively reduced, and the yield of the 2-chloro-4-nitrophenol is increased. And the synthesized 5-nitro-2-aminophenol has relatively high purity (99.5%) and relatively high yield (-86%). The method has the advantages of conventional production steps and conventional process equipment, and has a good application prospect.

The invention relates to an electron withdrawing group terminated polyimide covalent organic framework material as well as a preparation method and application thereof. According to the invention, 4, 4 '-(hexafluoroisopropenyl) diphthalic anhydride and a tetra (4-aminophenyl) methane monomer are utilized to prepare a polyamic acid covalent organic framework, and 4-cyanophenyl, 4-aminotrifluorotoluene, 4-nitroaniline and 4-chloroaniline are utilized to perform end capping, so that the electron withdrawing group-terminated polyimide covalent organic framework material is prepared. The rich pore structure of the COF skeleton provides a rapid ion transport channel, the transport of current carriers is promoted, and the electron cloud density of the COF skeleton is adjusted through Lewis acidity formed by an end-capping electron withdrawing group through an induction effect, so that an electron-deficient domain is constructed. When being used in a lithium metal battery system, the material can guide uniform distribution of lithium ions and solve the problem of lithium dendrite growth; when the material is loaded on a lithium-sulfur battery positive electrode material, polysulfide can be pulled to move directionally to complete order reduction conversion reaction, so that the lithium-sulfur battery with long cycle life is obtained.

The safety interlocking device comprises a kettle body, a hollow supporting shaft is arranged in the kettle body, a plurality of stirring blades are fixed to the outer wall of the hollow supporting shaft at equal intervals, a first condensation pipe is arranged on the inner wall of the hollow supporting shaft in an attached mode, and a second condensation pipe is arranged on the inner wall of the first condensation pipe. A first condensation pipe is arranged in the kettle body, a condensation pipe joint is arranged at one end of the first condensation pipe, an interlayer is arranged on the inner wall of the kettle body, a third condensation pipe is laid in the interlayer, a cooling mechanism and a gas storage mechanism are arranged on one side of the kettle body at the same time, the cooling mechanism is connected with the gas storage mechanism, and an opening and closing mechanism is arranged on the inner wall of the kettle body; the safety interlocking device comprises a kettle body, a cooling mechanism is arranged in the kettle body, the cooling mechanism comprises a plurality of liquid passing pipes, a plurality of liquid passing openings are formed in the inner wall of one side of the kettle body, and the liquid passing openings are connected with the two ends of the liquid passing pipes respectively. The effect of explosion in the reaction can be effectively avoided.

The invention relates to an atestin diterpenoid compound as well as a preparation method and application thereof, and belongs to the technical field of medicinal chemistry. The preparation method of the atestin diterpenoid compound comprises the following steps: S1, taking commercially available paranitroaniline 1a as a raw material to obtain an intermediate 2a; carrying out amide condensation and reduction on the intermediate 2a and corresponding amine to obtain intermediates 4a-4c; s2, taking commercially available m-nitrophenol 1d as a raw material to obtain an intermediate 3d; s3, taking commercially available 1-(t-butyloxycarbonyl) piperidine-3-carboxylic acid 1e as a raw material to obtain an intermediate 3e; s4, taking a compound J10 separated from a natural plant sea lacquer as a raw material to obtain compounds HXY1-6; and S5, taking a compound J12 separated from a natural plant sea lacquer as a raw material to obtain compounds HXY7-23. The invention aims to explore a preferable compound with a novel structure, better activity and high safety through structural optimization of a natural product, and provides support for research and development of a novel sEH inhibitor and an anti-AD drug.

The application discloses a preparation method of triclabendazole, and relates to the technical field of raw medicine synthesis. The method comprises the following steps: taking 4-chloro-5-(2,3-dichlorophenoxy)-2-nitroaniline as raw material, and sequentially performing reduction in an iron powder ethanol system, ring closure with a sulfur-containing ring closure reagent, methylation with dimethyl sulfate, and crystallization and purification in ethanol to obtain triclabendazole finished products. In the reaction process, iron mud is removed through pressure filtration, ethanol is recovered through distillation, and the ring closure intermediate is precipitated under acidic conditions. The process condition is clear, the operation is simple, the emission of hazardous waste can be reduced, the utilization rate of solvents and the purity of products can be improved, and the method is suitable for industrialized production of triclabendazole raw medicine.

The invention relates to an environment-friendly stripping agent of photosensitive ink for electroplating shielding, and belongs to the technical field of stripping agents. The preparation method comprises the following steps: carrying out nucleophilic addition on phosphorous acid and diethylene glycol monobutyl ether to obtain a modified precursor containing a phosphoester structure, carrying out Michael addition on the modified precursor and ortho-aminophenol to obtain a modified monomer, carrying out diazotization reaction on the modified monomer and ortho-nitroaniline, and then reducing to obtain the 2-(2-nitrophenyl)-1, 2, 4-thiadiazole. And finally, compounding the modified corrosion inhibitor with a stripping agent system, so as to obtain the environment-friendly stripping agent for the photosensitive ink for electroplating shielding. The environment-friendly stripping agent of the photosensitive ink for electroplating shielding has the advantages of environment friendliness, no toxicity, high stripping efficiency, broad-spectrum corrosion inhibition and few surface residues.

The application discloses a method for preparing 2-nitro-2'-hydroxy-5'-tert-octyl azobenzene in a water medium system. The method controls the molar dosage ratio of tert-octyl phenol and NaOH in an emulsification process, controls the mass concentration of tert-octyl phenol in an emulsion, controls the molar dosage ratio of o-nitroaniline and tert-octyl phenol, and controls the mass dosage ratio of an anionic high polymer surfactant and a non-ionic surfactant, so that 2-nitro-2'-hydroxy-5'-tert-octyl azobenzene with high purity is prepared. Compared with a traditional synthesis process, the method uses water as a reaction medium, avoids the use of an organic solvent, effectively reduces the difficulty in treating subsequent wastewater, and achieves a target product yield of more than 95% and a purity of 91.79%-94.52%.

A synthesis method of a maribavir intermediate 2-bromo-5,6-dichloro-1H-benzimidazole, which is prepared from 4,5-dichloro-2-nitroaniline as raw material through hydrogenation reduction, cyclization and nucleophilic substitution reaction to obtain the intermediate 2-bromo-5,6-dichloro-1H-benzimidazole. The reagent selected in the application has low price, mild reaction condition, simple operation, high process reproducibility, simple post-treatment, high product purity and yield, and has realized workshop industrial production.

The invention discloses a phase-change temperature-control polyurethane material and a preparation method thereof, and relates to the technical field of polymer materials. When preparing the phase-change temperature-control polyurethane material, the present invention reacts vanadium dioxide and 4-anilinotriethoxysilane to obtain pre-modified vanadium dioxide; pre-modified vanadium dioxide and N,N-dimethyl-4-nitrosoaniline are reacted to obtain modified vanadium dioxide; phenylboric acid and 3-chloropropylmethyldimethoxysilane are polymerized and end-capped with 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane to obtain borosiloxane oligomer; borosiloxane oligomer, 1,6-hexanediol and isophorone diisocyanate are polymerized to obtain functionalized polyurethane; functionalized polyurethane and modified vanadium dioxide are uniformly mixed, and compression molding is performed to obtain the phase-change temperature-control polyurethane material. The phase-change temperature-control polyurethane material prepared by the present invention has excellent energy-saving temperature control, anti-aging, antibacterial, self-healing and mechanical properties.

The invention relates to a preparation method of an environment-friendly dye intermediate and the environment-friendly dye intermediate prepared by the method. The preparation method of the environment-friendly dye intermediate comprises the following steps: a dissolving step: 2-R-4-nitroaniline and halate are dissolved in an organic solvent to obtain an initial solution, the chemical structural formula of the 2-R-4-nitroaniline is shown in the formula (1), R represents-Cl,-Br or-CN: (1); a reaction step: hydrogen chloride gas is introduced into the initial solution for a reaction, and a reaction product is obtained; and a separation step: carrying out separation treatment on the reaction product to obtain mother liquor and a crude product. The preparation method of the environment-friendly dye intermediate is more reasonable in process, and the organic solvent is used in the preparation process, so that the environment-friendly index of the product reaches the standard, and no high-COC and / or PCP sewage is discharged.

The invention discloses modified furyl polyamide and a preparation method thereof, and belongs to the technical field of furyl polyamide preparation. The preparation method comprises the following steps: S1, dissolving 2-methyl-3-nitroaniline and paraformaldehyde in trifluoroacetic acid under an ice bath condition, stirring in an inert gas atmosphere, adding pure water, continuously stirring, adjusting the pH value, filtering, refluxing at normal temperature, and drying in vacuum to obtain a diamine precursor; the preparation method comprises the following steps: dispersing a diamine precursor in absolute ethyl alcohol in a nitrogen atmosphere, adding Pd / C, uniformly mixing, slowly dropwise adding N2H4.H2O, heating, refluxing, adding deionized water, filtering, washing, and drying in vacuum to obtain a diamine monomer; s2, a diamine monomer and 2, 5-furandicarbonyl chloride are subjected to a reaction, and furyl polyamide is prepared; and S3, uniformly mixing furyl polyamide, DMF and NaH, adding bromohydrocarbon, carrying out a stirring reaction in an inert gas, adding the obtained product into ice water, filtering, washing, and carrying out vacuum drying to obtain the modified furyl polyamide.

The present invention provides a preparation method of a triazine derivative. The preparation method comprises the following steps: subjecting p-nitroaniline to a substitution reaction with compound A to form intermediate B; and subjecting intermediate B to a hydrogenation reduction alkylation reaction with compound C to obtain the triazine derivative. The above method provided by the present invention prepares the triazine derivative by a two-step method of substitution first and then hydrogenation reduction alkylation, which not only has a high product yield, but also greatly shortens the process flow. At the same time, this method effectively avoids the generation of by-products of disubstituted p-phenylenediamine in the traditional process, makes the product separation easy, greatly reduces the cost, has no pollution, has high product quality, and is easy to realize industrialization.

This invention belongs to the field of organic chemical synthesis technology, specifically relating to a method for synthesizing 2-fluoro-3-aminobenzoic acid, an important chemical intermediate. Specifically, o-nitroaniline is condensed with hydrated trichloroacetaldehyde and hydroxylamine hydrochloride to obtain 2-(hydroxyimino)-N-(2-nitrophenyl)acetamide; the resulting product undergoes an intramolecular Beckmann rearrangement to generate 7-nitroindigo; 7-nitroindigo undergoes Bayer-Villedge oxidation to generate 2-amino-3-nitrobenzoic acid; 2-amino-3-nitrobenzoic acid undergoes diazotization and halogenation reactions to generate 2-fluoro-3-nitrobenzoic acid or 2-chloro-3-nitrobenzoic acid; 2-fluoro-3-nitrobenzoic acid can be further reduced by nitro to obtain 2-fluoro-3-aminobenzoic acid; or, 2-chloro-3-nitrobenzoic acid can be esterified to obtain 2-chloro-3-nitrobenzoic acid ester, which can then be fluorinated, saponified, and reduced to obtain 2-fluoro-3-aminobenzoic acid. The raw materials of this invention are low in cost and readily available, and the entire reaction route has specific regioselectivity, making it suitable for industrial production.

The invention discloses a method for synthesizing 3, 5-dichloronitrobenzene, which comprises the following steps of: a, adding 2, 6-dichloro-4-nitroaniline into concentrated sulfuric acid and nitrososulfuric acid to carry out diazotization reaction to obtain diazo liquid; b, adding the diazotization liquid in the step a into a mixture of a reducing agent and a catalyst copper salt, and carrying out a deamination reaction; c, a solvent is added for extraction, and a 3, 5-dichloronitrobenzene solution is obtained. The method for synthesizing the 3, 5-dichloronitrobenzene is simple in process operation, low in production cost, high in yield and suitable for industrial production.

The invention discloses a preparation method of high-temperature-resistant and corrosion-resistant alloy rubber, and relates to the technical field of rubber. Silicone oil and organic aluminum are combined to form an organic silicon-aluminum structure capable of absorbing free radicals generated by heat, then low-melting-point bismuth alloy, boron nitride, modified silicone oil and silicone rubber are mixed, and through vulcanization pressing, the bismuth alloy and boron nitride form a network structure and are connected with a rubber base material to form a heat dissipation channel. The high-temperature resistance of the rubber is further enhanced; 3, 4-dichloro-6-nitroaniline, 2, 6-nonadienol and 2-hydroxy-4-(methylacryloyloxy) benzophenone react to form a benzotriazole structure to effectively absorb ultraviolet rays, benzophenone is introduced, a multi-benzene-ring structure is constructed, the ultraviolet ray absorption capacity is greatly improved, the ultraviolet aging resistance of rubber is improved, then the benzotriazole structure is grafted to the surface of rubber, and the ultraviolet aging resistance of the rubber is improved. Double bonds are polymerized to form an anti-ultraviolet protective film, so that the anti-ultraviolet aging performance of the rubber is enhanced.

The present application discloses a method for continuously and efficiently synthesizing N-methyl-p-nitroaniline, comprising the following steps: S1, using an organic solvent to prepare 1-fluoro-4-nitrobenzene solution, stirring and dissolving, filtering and removing impurities, transferring to container A for insulation; S2, using an organic solvent to prepare methylamine solution, adding a preferred catalyst, controlling the temperature at 25 DEG C-50 DEG C, transferring the prepared solution to container B for insulation; S3, using an organic solvent to exhaust, ensuring that there is no bubble in micro mixer and continuous flow reactor, utilizing a transfer pump to introduce material from container A and container B into continuous flow reactor in a certain ratio through a micro mixer, regulating the temperature and pressure in the reactor for reaction to obtain a reaction solution; S4, after the reaction solution flows out, it is collected in container C, the collected reaction solution is filtered, washed with an organic solvent, and dried to obtain a crude product N-methyl-p-nitroaniline. The present application effectively solves the problems of high safety risk of intermittent kettle process, complicated steps, and long reaction time.

The present invention discloses an ethoxylated [6] aromatic hydrocarbon microcrystal and its application in recovering nitroaniline. The present invention obtains ethoxylated [6] aromatic hydrocarbon solid microcrystals by a cooling crystallization-vacuum drying method. The ethoxylated [6] aromatic hydrocarbon microcrystals are dispersed in waste containing nitroaniline to achieve adsorption of nitroaniline by the ethoxylated [6] aromatic hydrocarbon solid powder. The adsorption method of the present invention is simple to operate, safe and reliable, and has high adsorption efficiency. The ethoxylated [6] aromatic hydrocarbon solid powder is easily obtainable and reusable.

The invention discloses water-based ink for paperboard printing and a green printing process of the water-based ink, and relates to the technical field of water-based ink for paperboards. Sodium nitrite is taken and added into deionized water to be evenly mixed, and a sodium nitrite solution is obtained; adding hydrochloric acid and acetic acid into deionized water, and uniformly mixing; 4-methyl-2-nitroaniline is added, and stirring is carried out; cooling, adding a sodium nitrite solution, and reacting to obtain a solution; adding sodium hydroxide into deionized water, uniformly mixing, adding azoic coupling component, uniformly mixing, and cooling; slowly adding the solution and reacting; heating, reacting and cooling; and carrying out suction filtration, drying and refining to obtain the water-based pigment. Taking a polyurethane emulsion and a polyacrylate emulsion, and uniformly mixing the polyurethane emulsion and the polyacrylate emulsion to obtain a polyurethane-polyacrylate emulsion; taking the polyurethane-polyacrylate emulsion, water-based pigment, polyethylene wax emulsion, a wetting agent, a flatting agent, deionized water and absolute ethyl alcohol, and dispersing to obtain the water-based ink.

The invention provides a preparation method of 2-chloro-4-nitro-6-bromoaniline and a diazonium salt of the 2-chloro-4-nitro-6-bromoaniline. The preparation method of 2-chloro-4-nitro-6-bromoaniline comprises the following steps: a chlorination step: carrying out a chlorination reaction on paranitroaniline to obtain a chlorination reaction product, and carrying out post-treatment on the chlorination reaction product to obtain a 2-chloro-4-nitroaniline product; wherein the water content of the 2-chloro-4-nitroaniline product is 60% or below; and a bromination step: mixing the 2-chloro-4-nitroaniline product with sulfuric acid to obtain a sulfuric acid slurry, and carrying out a bromination reaction on the sulfuric acid slurry and a brominating agent to obtain a 2-chloro-4-nitro-6-bromoaniline reaction solution. The 2-chloro-4-nitroaniline is prepared by taking paranitroaniline as an initial raw material through chlorination reaction and post-treatment, and then the sulfuric acid is taken as a solvent to penetrate through the subsequent reaction, so that the separation process is simplified, the production cost is reduced, and waste and pollution are reduced.

The application discloses a resin for adsorbing o-nitroaniline and a preparation method thereof, and belongs to the technical field of resin production. After polystyrene resin is subjected to a chloroacetylation reaction, the polystyrene resin is reacted with octadecylamine to graft long-chain alkyl, imino and carbon groups on the molecular chain structure of the polystyrene resin. The long-chain alkyl can form a network winding structure, facilitating the contact adsorption of the resin and o-nitroaniline and enhancing the hydrophobicity of the resin. Hydrophobic interaction and hydrogen bond interaction exist between the grafted polystyrene resin and o-nitroaniline, which can improve the adsorption performance of the resin on o-nitroaniline in wastewater, is beneficial to the recovery of o-nitroaniline in the wastewater and reduces the pollution caused by wastewater discharge.

The utility model relates to a water absorption tank for material tail gas treatment in paranitroaniline and ortho-nitroaniline production, which comprises a circular tank body, water is contained in the tank body, a sealing cover is arranged on the tank body, a material tail gas inlet and an exhaust outlet are arranged on the sealing cover, an exhaust pipe is arranged on the exhaust outlet, and a water outlet is arranged on the exhaust pipe. A gas inlet pipeline extending below the liquid level in the tank body is arranged on the material tail gas inlet; a section of distributor for uniformly releasing material tail gas is arranged from the part, extending below the liquid level, of the gas inlet pipeline to the end part; a water adding opening is formed in the upper end of the side wall of the tank body, an overflow opening is formed in the middle of the side wall of the tank body, an emptying opening is formed in the lower end of the side wall of the tank body, and a transparent visible observation window is arranged at the upper water adding limit position of the side wall of the tank body; a heater is arranged on the outer wall of the tank body; a temperature measuring opening is formed in the lower portion of the side wall of the tank body. According to the utility model, the problem that the absorption tower is blocked in the prior art is solved, material tail gas is purified, materials can be recycled, and the cost is saved.