3531-19-9Relevant articles and documents
Synthesis process 6 -chloro -2-4 -dinitroaniline
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Paragraph 0035-0039; 0042-0046, (2021/10/02)
The invention provides a synthesis process of 6 - chloro -2 and 4 -dinitroaniline, which comprises a pulping step of dissolving 2, 4 -dinitroaniline in an organic solvent. A chlorination step in which a chlorinating agent is added to the slurry obtained in the above slurrying is a chlorination step. and: The post-treatment step after the chlorination is completed. In the pulping step, an acid solution is further added. The chlorinating agent is dichlorohydantoin. The reaction system is stable in reaction system, thorough in material reaction, less in side reaction, high in raw material conversion rate, good in reaction product crystal shape, high in yield, high in production efficiency, remarkable in production efficiency, remarkable in energy saving and emission reduction effect and high in safety and controllability.
2, 4-dinitro-6-chloroaniline derivative and synthesis method and application thereof
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Paragraph 0020-0022, (2020/07/13)
The invention discloses a 2, 4-dinitro-6-chloroaniline derivative with a novel structure. A formula (I) and a formula (II) are described in the specification. R is selected from what is described in the specification. The invention discloses a synthesis method of the formula (I) and/or the formula (II), and application in the aspects of antibiosis and poisoning nematode killing.
Method for synthesizing 6-chloro-2, 4-dinitroaniline by chlorine and hydrogen peroxide method
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Paragraph 0027-0032, (2020/04/17)
The invention discloses a method for synthesizing 6-chloro-2, 4-dinitroaniline by a chlorine and hydrogen peroxide method. The method comprises the following steps of grinding 2, 4-dinitroaniline andadding the ground 2, 4-dinitroaniline into a kettle; adding a chlorine and hydrogen peroxide combined chlorination mother liquor into the kettle, raising the temperature to 25-65 DEG C, and stirring for 1-2 hours; introducing chlorine at the temperature of 25-65 DEG C, wherein the molar ratio of the 2, 4-dinitroaniline to the chlorine is 1: (0.51-0.53); keeping the temperature at 30-70 DEG C for 1-2 hours; raising the temperature to 45-80 DEG C, and adding hydrogen peroxide according to a molar ratio of 2, 4-dinitroaniline to the hydrogen peroxide of 1: (0.52-0.8); carrying out heat preservation reaction at 80 +/-5 DEG C for 1-2 hours, and carrying out solid-liquid separation after the reaction is finished to respectively obtain a filter cake and the chlorine and hydrogen peroxide combinedchlorination mother liquor. According to the method, the purity of the obtained product is high, the production efficiency is high, the mother liquor can be continuously recycled, and the zero-emission clean production is realized.
Cyclic synthesis method of nitroaniline chloride
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Paragraph 0030; 0031; 0034; 0035, (2020/10/05)
The invention discloses a cyclic synthesis method of nitroaniline chloride. The cyclic synthesis method comprises the following steps: (1) mixing nitroaniline and sulfuric acid, and preheating to a chlorination reaction temperature; (2) respectively inputting the solution obtained in the step (1) and chlorine into a reactor to carry out a chlorination reaction, cooling the material obtained in thereaction to obtain a supersaturated solution, and crystallizing to separate out a supersaturated product namely nitroaniline chloride; and (3) carrying out solid-liquid separation on the material cooled in the step (2), carrying out flash evaporation on the obtained saturated nitroaniline chloride/sulfuric acid solution, recycling hydrogen chloride, and circulating hydrogen chloride to the step (1) to replace sulfuric acid for dissolving nitroaniline, thereby realizing cyclic synthesis of nitroaniline chloride. Product super-saturation precipitation and saturated solution circulation are realized, the proportion of raw materials in a reaction system is reduced, the reaction is promoted to enter a uniform liquid phase system, meanwhile, mother liquor can be recycled, and the purposes of high efficiency, controllability and comprehensive utilization of resources are achieved.
Synthetic method for 2,4-dinitro-6-chloroaniline
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Paragraph 0030-0033; 0034-0037; 0038-0042, (2018/07/30)
The invention discloses a synthetic method for 2,4-dinitro-6-chloroaniline. The method comprises the following steps: dispersing substrate 2,4-dinitroaniline into a mixed solution composed of hydrochloric acid, a catalyst and a dispersing agent, performing pulping, introducing a chlorine gas for a first-stage chlorination reaction, then adding hydrogen peroxide dropwise for a second-stage chlorination reaction, after the reaction is completed, filtering the reaction liquid, washing the filter cake to the pH of 6.0-7.0, and performing drying to obtain the product 2,4-dinitro-6-chloroaniline. According to the method provided by the invention, compounding of the phase transfer catalyst and the dispersing agent is adopted for use, so that a reaction material system has good fluidity, the use amount of chlorinating agents is greatly reduced, and the purity and yield of the product are improved; and after filtration is performed, the hydrochloric acid, catalyst and dispersing agent in the mother liquor can be returned to a reaction to continue being used, the use amount of the two chlorinating agents is controlled, so that the acidity of the mother liquor is kept balanced, a salt component is not contained, the mother liquor can realize an endless cycle mechanical application, clean production is truly achieved, and the energy-saving emission-reducing benefits are remarkable.
2,4-dinitro-6-aminochlorobenzene preparation method
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Paragraph 0042-0045, (2017/04/08)
The invention relates to the chemical industry field, in particular relates to a preparation method of 2,4-binitro-6-chloroaniline. The preparation method of the 2,4-binitro-6-chloroaniline is carried out under heat insulation condition by adopting a pipeline reactor, the process from contact of the materials to reaction is finished instantly without producing polychlorinated compounds and chlorine dioxide, the potential safety hazard is avoided, the product quality and yield are greatly improved, the HPLC (high performance liquid chromatography) purity is not less than 98%, and the 2,4-dinitraniline residue is not more than 1%; the final product does not come into contact with oxidized sodium chlorate and chlorine due to adoption of the pipeline continuous reaction, no oxidation product is produced in the system, the product quality is improved, and the infinite recycling of the master liquid can be realized; the mother liquid is filtered through a film to recycle sodium chloride, and the infinite recycling of the mother liquid is realized after the mother liquid adsorbs hydrogen chloride, and the sodium chlorate approaches to a theoretical consumption.
Synthetic technology for 2-chloro-4,6-dinitroaniline
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Paragraph 0029; 0030, (2017/01/19)
A synthetic technology for 2-chloro-4,6-dinitroaniline is disclosed. The technology comprises (1) dispersing 2,4-dinitroaniline in hydrochloric acid and a catalyst and stirring to form a slurry, wherein the mass fraction of hydrochloric acid is 1-8%; (2) introducing chlorine into the slurry obtained in the step (1) for chlorination reaction; (3) adding a sodium chlorate solution into the reaction solution in the step (2) and continuing performing chlorination reaction, wherein the mass fraction of the sodium chlorate solution is 20%-40%; and (4) filtering the reaction solution obtained in the step (3), washing the filter cake until the pH value is 6.0-7.0, returning the mother liquid to the step (1) as hydrochloric acid and the catalyst for cyclic utilization utile the sodium chloride in the mother liquid is saturated, and discharging the mother liquid into a wastewater processing system, wherein the molar ratio of 2,4-dinitroaniline, chlorine and sodium chlorate is 1:(0.2-0.8):(0.06-0.3). The technology is high in yield, the purity of the obtained product is high, cost is low, the cycling times of the mother liquid are more, the wastewater discharging amount is less, and the benifit of energy saving and emission reduction is substantial.
Process for the preparation of chloronitroanilines and chloronitrophenols
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, (2008/06/13)
The invention relates to a process for the preparation of chloronitroanilines or chloronitrophenols, which comprises chlorinating nitroanilines or nitrophenols in hydrochloric acid by adding simultaneously separate streams of nitroanilines or nitrophenols and of a chlorinating agent to said hydrochloric acid. The process affords pure products in good yield. An accumulation of chlorine during the reaction is avoided. Chloronitroanilines and chloronitrophenols are useful intermediates for the snythesis of disperse dyes.
Navy blue mixtures of disperse mono-azo dyes for cellulose acetate
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, (2008/06/13)
Mixtures of dyes of the formula I STR1 where X is chlorine or bromine, Z is hydrogen, methyl, ethyl, C1 -C4 -alkoxy or acetylamino, R is C1 -C4 -alkyl, R1 and R2 independently of one another are each allyl or methallyl or are each C1 -C6 -alkyl which is unsubstituted or substituted by hydroxyl, C1 -C4 -alkoxy or alkanoyloxy, or R1 and R2 together with the nitrogen atom are morpholino or tetra-, penta- or hexamethyleneimino, and one of the radicals R1 and R2 may furthermore be hydrogen.
Process for the production of 2,4-dinitroanilines
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, (2008/06/13)
A method for the preparation of 2,4-dinitroaniline from 1-chloro-2,4-dinitrobenzene comprising adding ammonia to melted 1-chloro-2,4-dinitrobenzene in such dosages that the temperature of the mixture does not exceed 120° C. and that the pressure does not exceed 3 bar. 6-halo-2,4-dinitroaniline may be produced from the so formed 2,4-dinitroaniline by neutralizing the suspension containing the 2,4-dinitroaniline with acid to give a pH of from the 6-halo-2,4-dinitroaniline. The 6-halo 2,4-dinitroaniline is useful in the preparation of dyestuffs.
