8 results about "M-dichlorobenzene" patented technology

The invention discloses a method and system for continuously synthesizing 2, 4-dichloroacetophenone, and the method for continuously synthesizing 2, 4-dichloroacetophenone comprises the following steps: S1, mixing m-dichlorobenzene and a catalyst to form a turbid liquid, and continuously inputting the turbid liquid into a tubular reactor; s2, enabling gas-phase acetyl chloride to pass through a micro-interface generator to form micron-sized microbubbles, continuously inputting the micron-sized microbubbles into a tubular reactor, and carrying out mixed reaction on the micron-sized microbubbles and the turbid liquid to obtain a mixed reaction liquid; and S3, continuously inputting the mixed reaction liquid and water into a hydrolysis reactor, and carrying out hydrolysis and separation to obtain 2, 4-dichloroacetophenone. According to the invention, the traditional kettle type stirring reaction is changed into micro-interface reaction, and the mass transfer area and the total mass transfer rate among multiple phases can be multiplied, so that the reaction rate is greatly improved, the side reaction is effectively controlled, and meanwhile, the product yield, the reaction safety and the like are improved.

The application discloses a conjugated polymer of chlorobenzene, o-dichlorobenzene or m-dichlorobenzene and EDOT as well as a preparation method and application thereof, and belongs to the field of polymer electrochromic materials. By introducing chlorine atoms as intermediates in different active sites of benzene and EDOT as a strong electron-donating group, the obtained conjugated polymer has the characteristics of a wider redox peak, good optical contrast, fast response time, high coloring efficiency, good stability and the like.

This invention belongs to the field of catalyst technology, specifically relating to a supported iron-ruthenium catalyst and its application in the synthesis of m-dichlorobenzene and / or para-dichlorobenzene. The iron-ruthenium catalyst comprises a support and iron and ruthenium supported on the support. The support comprises quaternary ammonium salt-modified diatomaceous earth. Based on the total weight of the catalyst, the mass percentage of iron is 5-15%, and the mass percentage of ruthenium is 3-9%. The abundant active sites on the surface of the quaternary ammonium salt-modified diatomaceous earth support can significantly improve the catalytic activity and selectivity for m-dichlorobenzene and / or para-dichlorobenzene, without the formation of trichlorobenzene. The catalyst lifetime is 5-8 times longer than that of iron catalysts. The product can be separated and purified by stripping, distillation, and crystallization. The process is simple and can obtain high-purity m-dichlorobenzene and para-dichlorobenzene products.

The invention relates to a method for preparing fenbendazole by taking m-dichlorobenzene as a raw material. The method comprises the following steps: nitrating m-dichlorobenzene to obtain 1, 3-dichloro-4-nitrobenzene; the 4-chloro-3-nitrodiphenyl sulfide reacts with thiophenol salt to obtain 4-chloro-3-nitrodiphenyl sulfide; reacting with ammonia to obtain 4-amino-3-nitrodiphenyl sulfide; reducing to obtain 3, 4-diaminodiphenyl sulfide; and finally, cyclizing with methyl cyanate to obtain benthioimidazole. The method has the advantages that cheap m-dichlorobenzene is used as a starting raw material, benzenethiol is efficiently synthesized through nitration, thiophenol substitution, ammoniation, reduction and cyclization reaction, the defect that expensive or difficult-to-obtain raw materials are used in the prior art is avoided, and the method is novel in route, simple and convenient to operate, mild in reaction condition, high in total yield and suitable for industrial production.

The application discloses a system and method for purifying meta-dichlorobenzene from mixed dichlorobenzene. The system for purifying meta-dichlorobenzene from mixed dichlorobenzene comprises a meta-position tower A and a meta-position tower B, a tower kettle of the meta-position tower A is connected with a feeding port of the meta-position tower B, a tower top of the meta-position tower B is connected with the feeding port of the meta-position tower A, and a meta-position outlet is arranged on the tower top of the meta-position tower A; the meta-position tower A and the meta-position tower B are both packed rectification towers, wherein the packing is high-efficiency silk screen packing, and the theoretical plate number of the meta-position tower A and the meta-position tower B is not less than 100. The purification system of the application uses simple rectification equipment, the purity of the purified meta-dichlorobenzene is high, the product yield is high, and the equipment and operation cost are low.

The present application relates to a kind of catalyst for preparing dichlorobenzene and its preparation method and application, diatomite is used as matrix, CuS phase and Fe2S3 phase are covered on the surface of matrix successively from inside to outside, and the catalyst is used for preparing dichlorobenzene by benzene chlorination.The present application is used for the method for preparing dichlorobenzene by continuous method, the yield of dichlorobenzene is more than 91%, the yield of m-dichlorobenzene is less than 1%, the yield of polychlorobenzene is less than 1%, reach the effect of energy saving, improve conversion rate.

The invention belongs to the technical field of chemical engineering, and particularly relates to a method for continuous nitration reaction of m-dichlorobenzene in a microreactor. The method comprises the following steps: by taking m-dichlorobenzene and fuming nitric acid as raw materials, carrying out continuous nitration reaction in a microreactor to obtain 2, 4-dichloronitrobenzene and 2, 6-dichloronitrobenzene. The problems of tedious operation and waste acid recovery are effectively solved. The microreactor has high mass transfer and heat transfer efficiency, and can quickly remove heat released by nitration reaction of m-dichlorobenzene; according to the invention, the liquid-liquid two-phase complete mixing time of m-dichlorobenzene and the nitrating agent in the channel can be prolonged, so that the nitration reaction process becomes mild and controllable, the occurrence of temperature runaway and explosion accidents is avoided, the intrinsic safety of the process is improved, and industrial production is easy to carry out.

The invention discloses a method for continuously producing 1, 3-dichloro-4, 6-dinitrobenzene, m-dichlorobenzene is used as a raw material, step-by-step nitration is carried out by adopting a countercurrent multilayer stirring nitration tower, and the 1, 3-dichloro-4, 6-dinitrobenzene is obtained through collaborative integration of nitric acid axial multi-point segmented feeding, segmented heat exchange and waste acid reuse closed-loop control. The problems of protruding local hot spots, limited mass transfer, high energy consumption and the like in the traditional nitration process are solved, nitric acid is added in a graded manner through a plurality of independent adjustable feeding points distributed along the tower height, and the reaction rate distribution is matched; waste acid is subjected to online detection and concentration adjustment and then is reused for the first nitration tower, and meanwhile, waste acid at the bottom of the tower is used for preheating feeding so as to reduce energy consumption. The method realizes gentle release of reaction heat and stable control of a temperature field, the yield is greater than or equal to 90%, the unit consumption of sulfuric acid is reduced by 45-50%, the energy consumption of a unit product is reduced by more than 30%, and the method is suitable for large-scale continuous production.