19 results about "M-dichlorobenzene" patented technology

The present invention discloses a strong, non-toxic, antibacterial and antiviral nano-functional material and a preparation method thereof. The nano-functional material is green, non-toxic and harmless, and its antibacterial and antiviral effect can reach more than 99%. The new nano-material innovatively uses the natural antibacterial agent meta-dichlorostyrene meta-dichloroacetophenone as the main body of the material to exert its antibacterial and antiviral effects. This makes the new nano-material not only have extremely strong antibacterial and antiviral effects, but also as a natural antibacterial agent, when it is used as a textile material, it can be non-toxic and harmless to the human body, green and healthy. It has a better inhibitory effect on both Gram-negative and Gram-positive bacteria than nano-copper oxide and meta-dichlorophenylethanol and meta-dichloroacetophenone. The present invention also provides a preparation method for the nano-functional material, which includes chemical reaction processes such as boron hydrolysis reaction, catalytic oxidation reaction, electrocarboxylation reaction, and esterification reaction.

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 invention belongs to the technical field of organic chemical synthesis, and relates to a method for recycling a compound, in particular to a method for recycling 2, 6-dichloroacetophenone. The invention relates to a method for recycling 2, 6-dichloroacetophenone, which comprises the following steps: taking waste containing 2, 6-dichloroacetophenone as a raw material, and reacting in the presence of a catalyst and inorganic alkali to generate m-dichlorobenzene. According to the method, the dichloroacetophenone waste is used as the raw material to recover the m-dichlorobenzene serving as the dichloroacetophenone synthesis raw material, equipment required by the process is conventional equipment, other solvents are not involved in the reaction, normal-pressure reaction is adopted in the process, the reaction temperature is lower, the process path is shorter, the operation is simple, the safety is high, waste resources are recycled, and the method is suitable for industrial production. The environmental pollution is effectively reduced, and the raw material consumption of the dichloroacetophenone production process is remarkably reduced.

The present invention provides a method for separating mixed dichlorobenzenes. The method comprises: (a) contacting the mixed dichlorobenzenes with extractant A in an extractive distillation column for extractive distillation separation to obtain crude p-dichlorobenzene from the top of the extractive distillation column; (b) feeding the bottom material of the extractive distillation column and solvent B into a crystallization and precipitation unit to obtain crystals mainly composed of m-dichlorobenzene and o-dichlorobenzene, as well as a solvent phase of extractant A and solvent B; (c) heating the crystals mainly composed of m-dichlorobenzene and o-dichlorobenzene and feeding them into a rectification column for rectification separation, separating out the crude product containing solvent B from the top of the rectification column, and taking out the crude m-dichlorobenzene from the side line and the crude o-dichlorobenzene from the bottom of the column. The method of the present invention includes using extractive distillation technology, crystallization technology and rectification technology to separate the mixed dichlorobenzenes containing o-dichlorobenzene, m-dichlorobenzene and p-dichlorobenzene, and finally obtaining high-purity o-, m- and p-dichlorobenzene products.

The invention discloses a conjugated polymer of chlorobenzene, o-dichlorobenzene or m-dichlorobenzene and EDOT as well as a preparation method and application of the conjugated polymer, and belongs to the field of polymer electrochromic materials. Chlorine atoms are introduced into different active sites of benzene to serve as intermediates, EDOT serves as a strong electron donating group, and the obtained conjugated polymer has the advantages of being wider in redox peak, good in optical contrast ratio, short in response time, high in coloring efficiency, good in stability and the like.

The present invention relates to the technical field of pesticide synthesis, and discloses a method for synthesizing a flumioxazol intermediate 6-amino-7-fluoro-2H-benzo[b][1,4]oxazine-3(4H)-one. The method includes: using m-dichlorobenzene as a raw material, obtaining 6-amino-7-fluoro-2H-benzo[b][1,4]oxazine-3(4H)-one through nitration, fluorination, etherification and hydrogenation reduction ring closure; wherein, in the fluorination step, only one chlorine is fluorinated. The present invention only fluorinates one chlorine when synthesizing the flumioxazol intermediate 6-amino-7-fluoro-2H-benzo[b][1,4]oxazine-3(4H)-one, which can reduce the reaction temperature, reduce the generation of impurities during subsequent etherification, thereby improving product selectivity, and obtaining a higher yield and raw material conversion rate.

The present invention relates to the technical field of electrical insulation materials, and specifically to an oil-resistant and hydrolysis-resistant electrical insulation composite material, a preparation method, and an application thereof. The composite material comprises a membrane material, a paper material adhered to both sides of the membrane material, and a glue for bonding. The membrane material is made of polyphenylene sulfide, and the pulp used to prepare the paper material comprises polyphenylene sulfide staple fibers, meta-aramid staple fibers, and meta-aramid precipitation slurry. The polyphenylene sulfide is prepared by polymerization of anhydrous sodium sulfide and dichlorobenzene, wherein the molar ratio of the anhydrous sodium sulfide to the dichlorobenzene is 1:(0.95-0.98). The dichlorobenzene comprises meta-dichlorobenzene and para-dichlorobenzene, and the molar ratio of the meta-dichlorobenzene to the para-dichlorobenzene is (3-4):1. The oil-resistant and hydrolysis-resistant electrical insulation composite material of the present invention has good mechanical and electrical properties, can meet the application requirements in motors, and the composite material has excellent insulation properties, while also having oil resistance and hydrolysis resistance.

The application discloses a preparation method of alpha-bromo-2,4-dichloroacetophenone, characterized in that: the alpha-bromo-2,4-dichloroacetophenone is prepared from m-dichlorobenzene and acetyl chloride under the catalysis of aluminum oxide, and then the target product alpha-bromo-2,4-dichloroacetophenone is obtained through bromination in a solvent. The method comprises the following steps: taking m-dichlorobenzene as a starting material, and generating 2,4-dichloroacetophenone through a Friedel-Crafts acylation reaction of m-dichlorobenzene and acetyl chloride under the catalysis of aluminum oxide; the obtained 2,4-dichloroacetophenone is subjected to alpha-site monobromination reaction with sodium bromide (NaBr) under the action of a catalyst, and the target product alpha-bromo-2,4-dichloroacetophenone is obtained through heat preservation reaction. The method has the advantages of cheap and easily obtained raw materials, short reaction steps, simple operation, low three wastes, high yield of the target product, high purity, and suitability for industrial large-scale 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 invention relates to the technical field of electrical insulation materials, in particular to an oil-resistant hydrolysis-resistant electrical insulation composite material and a preparation method and application thereof.The composite material comprises a membrane material, paper materials adhered to the two sides of the membrane material and glue playing a bonding role, paper pulp for preparing the paper material comprises polyphenylene sulfide staple fibers, meta-aramid staple fibers and meta-aramid precipitation pulp. The polyphenylene sulfide is prepared by polymerization reaction of anhydrous sodium sulfide and dichlorobenzene, the molar ratio of the anhydrous sodium sulfide to the dichlorobenzene is 1: (0.95-0.98), the dichlorobenzene comprises m-dichlorobenzene and p-dichlorobenzene, and the molar ratio of the m-dichlorobenzene to the p-dichlorobenzene is (3-4): 1. The oil-resistant and hydrolysis-resistant electrical insulation composite material disclosed by the invention has good mechanical properties and electrical properties, can meet the application requirements in a motor, has good insulation properties, and has oil-resistant and hydrolysis-resistant properties at the same time.

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.

The present invention provides a tetraamide benzene derivative, the structure of which is shown in formula (I), wherein R 1 , R 2 , R 3 and R 4 Independently selected from alkyl, aromatic, cycloalkyl or alkylated substituted aromatic, the preparation method includes using m-dichlorobenzene as raw material, obtaining intermediate 1,5-dichloro-2,4-dinitrobenzene through nitration reaction, obtaining intermediate 4,6-dinitro-1,3-phenylenediamine through amination reaction, obtaining intermediate 1,2,4,5-benzene tetraamine tetrahydrochloride through reduction reaction, and finally obtaining the tetraamide benzene derivative through acylation reaction. The tetraamide benzene derivative of the present invention can be applied to polypropylene nucleating agent, effectively improving the mechanical properties such as crystallinity, molding speed and rigidity of polypropylene materials. The tetraamide benzene derivative of the present invention has no odor, good compatibility with materials, is easy to disperse, does not precipitate, can improve the performance of polypropylene materials, and broaden the application field of polypropylene materials.

The invention provides a method for separating dichlorobenzene isomers, which comprises the following steps of: pretreating the dichlorobenzene isomers, removing hydrogen chloride and tar in the dichlorobenzene isomers by combining multiple times of rectification, adsorption and desorption and multiple times of crystallization, and separating three isomers in the dichlorobenzene isomers to obtain m-dichlorobenzene, o-dichlorobenzene and p-dichlorobenzene with higher purity. The invention also provides a system for separating dichlorobenzene isomers. The method and system can be used for dichlorobenzene isomer separation, m-dichlorobenzene, p-dichlorobenzene and o-dichlorobenzene with high purity are obtained through separation, and efficient separation of m-dichlorobenzene, p-dichlorobenzene and o-dichlorobenzene is achieved.

The invention discloses an isomerization reaction kettle for transposition of o-dichlorobenzene and m-dichlorobenzene, and relates to the field of isomerization reaction kettles.The isomerization reaction kettle comprises a base, a reaction kettle body is arranged at the top of the base, the reaction kettle body is made of high-temperature-resistant and corrosion-resistant stainless steel, and stabilizing plates are evenly arranged on the outer surface of the reaction kettle body; the reaction kettle body is fixed on the base through a stabilizing plate, the top of the reaction kettle body is fixedly connected with a supporting column, and the top of the supporting column is fixedly connected with a supporting top plate; the bottom plate unit is arranged at the bottom of the reaction kettle body, the placing unit is arranged in the middle of the reaction kettle body and used for placing catalyst particles, the stirring unit is arranged at the top of the reaction kettle body and acts on the bottom plate unit and the placing unit, the catalyst particles are placed in the placing unit, and then o-dichlorobenzene is placed through a manhole; then, the stirring unit can improve the catalytic rate, so that chlorine atoms in orthodichlorobenzene molecules are subjected to position rearrangement, and m-dichlorobenzene is generated.