69 results about "Chlorotoluene" patented technology

The invention relates to a method for preparing 2, 6-dichlorotoluene with high selectivity, which comprises the following steps: (1) reacting toluene with olefin in the presence of a catalyst Cat1 to generate 3, 5-dialkyl toluene; (2) reacting the 3, 5-dialkyl toluene with chlorine in the presence of a catalyst Cat2 and a catalytic promoter to generate 2, 6-dichloro-3, 5-dialkyl toluene; and (3) the 2, 6-dichloro-3, 5-dialkyl toluene is subjected to a dealkylation reaction in the presence of a catalyst Cat3 to generate 2, 6-dichlorotoluene and olefin, and the olefin generated in the step (3) is the same as the olefin used in the step (1). The conversion rate of the reaction in each step is up to 100%, the selectivity exceeds 90%, the selectivity of the final target product 2, 6-dichlorotoluene reaches 90% or above, and the total yield exceeds 90%. The olefin obtained in the step (3) can be recycled.

The invention discloses an o-chlorotoluene continuous chlorination reaction device and method, and relates to the technical field of chemical engineering, the o-chlorotoluene continuous chlorination reaction device comprises a reaction kettle, the top of the reaction kettle is fixedly provided with a power assembly, the o-chlorotoluene continuous chlorination reaction device further comprises a mixing assembly, the mixing assembly is arranged in the reaction kettle, and the mixing assembly comprises a fixed partition plate fixedly connected to the middle section in the reaction kettle; a methylbenzene input pipe and a chlorine input pipe are fixedly inserted into the top end of the reaction kettle, a rotating rod is fixedly connected to the power output end of the power assembly, a rotating sleeve is rotatably inserted into the top end of the reaction kettle, and a movable partition plate is fixedly connected to the bottom end of the rotating sleeve; a plurality of lowering holes are formed in the surfaces of the movable partition plate and the fixed partition plate, the rotating rod is inserted into the rotating sleeve, and the top end of the rotating sleeve is fixedly sleeved with an outer gear ring, so that the problems that in the period of time when prepared finished products are discharged, the production is stopped, the production interval is large, and the production efficiency is high are solved. And continuous chlorination reaction cannot be carried out.

The invention discloses a purification device for chlorotoluene production waste gas and a use method thereof, and relates to the field of purification devices.The purification device is characterized by comprising a waste gas collection unit, a pretreatment unit, an absorption unit, a catalytic combustion unit, a deep purification unit and a tail gas detection and emission unit which are sequentially communicated along a waste gas treatment path; the device has the advantages that a three-stage treatment process of the absorption unit, the catalytic combustion unit and the deep purification unit is adopted, insoluble VOCs are comprehensively covered, and it is ensured that the concentration of chlorotoluene in tail gas is reduced to 10 mg / m or below; liquid chlorotoluene is removed through a gas-liquid separator of the waste gas collecting unit, then dust is intercepted through a filtering assembly of the pretreatment unit, cooling is conducted through a cooling assembly, blockage and inactivation caused by the fact that impurities are attached to a catalyst are prevented, meanwhile, HCl is removed in advance through the absorption unit, and acid gas is prevented from corroding a combustion furnace.

The application belongs to the technical field of organic synthesis and particularly relates to a synthesis method of electronic-grade 2,3,4-trihydroxybenzophenone. The application comprises the following steps: catalytic reaction: taking water as a solvent, mixing water and a catalyst uniformly, adding pyrogallic acid, heating the system to 40-50 DEG C, continuously adding trichloromethylbenzene, performing insulation reaction, cooling the system to 10-15 DEG C after the reaction is completed, crystallizing and precipitating, and then filtering to obtain a crude wet product; purification treatment: removing impurities from the crude wet product to obtain the high-purity 2,3,4-trihydroxybenzophenone. The application does not need to react in an organic solvent system, is green and environmentally friendly, does not need nitrogen protection, has low production cost, and is suitable for industrialized processing and production, and the prepared 2,3,4-trihydroxybenzophenone has high purity and high yield.

The invention provides a synthesis method of L-acetoxypropionyl chloride, and belongs to the field of medical intermediates and fine chemical engineering. The preparation method comprises the following steps: mixing L-lactic acid and acetyl chloride for first reaction; then adding trichlorotoluene and a catalyst to carry out a second reaction; and then rectifying and separating to obtain the product L-acetoxypropionyl chloride. According to the method, two raw materials react to generate two products, no sulfur dioxide or acidic mixed waste gas is generated, the utilization rate of the raw materials reaches 100% theoretically, and the method completely conforms to an environment-friendly and pollution-free green process. The safety of the used trichlorotoluene is far higher than that of thionyl chloride and phosgene, the reaction is mild, the reaction speed can be controlled by controlling the temperature and the input amount of the catalyst, the production operation is relatively safe, and the purity of the prepared L-acetoxypropionyl chloride product is greater than 99%, and the yield is greater than 90%.

The invention belongs to the technical field of chlorotoluene tail gas treatment, and particularly relates to an acid-alkali washing circulating system for pretreatment of parachlorotoluene tail gas adsorption equipment, the acid-alkali washing circulating system comprises a supporting protection frame, and the inner wall of the supporting protection frame is fixedly provided with a neutralizing tower, a magnet plate II, a system fan and a chlorotoluene tail gas emission concentration cylinder; the output end of the system fan is fixedly connected with a gas conveying pipeline, the gas conveying pipeline is communicated with the chlorotoluene tail gas emission concentration cylinder and the neutralizing tower, the outer wall of one side of the top of the supporting protection frame is fixedly connected with a spraying pipe, and the branch end of the spraying pipe is fixedly connected with the outer wall of one side of the top of the neutralizing tower; an atomization spraying frame is fixedly installed on the inner wall of the top of the supporting protection frame, the chlorotoluene tail gas emission concentration barrel is communicated with an industrial workshop chlorotoluene tail gas emission pipe, and chlorotoluene tail gas in the chlorotoluene tail gas emission concentration barrel enters an outer layer protection barrel of the neutralization tower through a system fan; and chlorotoluene tail gas is sprayed out from the first exhaust port and the second exhaust port through the inner-layer exhaust funnel.

The invention discloses a preparation method of 2-bromo-4-chloro-3-fluorotoluene, and belongs to the technical field of medical intermediates. The preparation method comprises the following steps: brominating 4-chlorotoluene serving as a raw material; carrying out deprotonation / boronation reaction by adopting a lithiation reagent to obtain corresponding boric acid; converting into amino under the catalysis of copper salt; and finally, carrying out diazotization and fluorination reaction to generate the 2-bromo-4-chloro-3-fluorotoluene. In the method, all the raw materials can be conveniently purchased on the market, and each step of reaction is simple and convenient in process, high in yield and easy for industrial production.

The present disclosure relates to a process for the preparation of 4-chloro-5-(4-tolyl)-1H-imidazole-2-formonitrile. The methods of the present disclosure are performed under mild reaction conditions. Further, the method of the present disclosure is simple, cost effective and environmentally friendly, and provides 4-chloro-5-(4-tolyl)-1H-imidazole-2-formonitrile with relatively higher purity and higher yield.

The invention relates to a method for preparing 2, 6-dichlorotoluene through dealkylation of 3, 5-dialkyl-2, 6-dichlorotoluene, and the method comprises the following steps: mixing 3, 5-dialkyl-2, 6-dichlorotoluene with an optional solvent, and carrying out a dealkylation reaction in the presence of a first catalyst and a second catalyst to obtain 2, 6-dichlorotoluene, wherein the first catalyst comprises a Lewis acid, and the second catalyst comprises a Bronsted acid. The invention also relates to a 2, 6-dichlorotoluene product prepared by the process according to the invention, and to the use of a combination of a Lewis acid and a Bronsted acid in the process according to the invention for catalyzing the dealkylation reaction.

The invention provides a preparation method of capicotib, which comprises the following steps: carrying out aromatic nucleophilic substitution (SNAr) on 4-aminopiperidine-4-carboxylic acid and 4-chloro-7-toluenesulfonyl-7H-pyrrole [2, 3-d] pyrimidine to obtain a compound as shown in a formula II, then esterifying under the action of trifluoroacetic anhydride to form a ring to form a compound as shown in a formula III, and carrying out cyclization on the compound as shown in the formula III to obtain the capicotib. The preparation method comprises the following steps: carrying out ring-opening reaction with (S)-3-amino-3-(4-chlorphenyl) propan-1-alcohol without separation under an alkali condition to obtain a compound as shown in a formula IV, and finally removing a toluenesulfonyl protecting group to obtain the carpatinib. The preparation method has the advantages of few reaction steps, mild conditions and short SNAr reaction time, the obtained intermediate compound is easy to purify, the purity and the total yield of the cappitatide can be improved, and the preparation method is suitable for industrial large-scale production.

The invention discloses a synthesis method of olatinib maleate. The synthesis method comprises the following steps: step 1, carrying out reaction on trans-4-hydroxycyclohexane ethyl formate under the action of a chlorination reagent to obtain a compound I; step 2, obtaining a compound II from the compound I under the action of methylamine; step 3, reacting the compound II with 4-chloro-7-toluenesulfonyl-7H-pyrrole [2, 3-D] pyrimidine under the action of alkali to obtain a compound III; 4, obtaining a compound IV from the compound III under the action of a reducing agent and a chlorination reagent; step 5, obtaining a compound V from the compound IV under the action of thiourea; step 6, obtaining VI from the compound V under the action of an oxidizing agent; step 7, obtaining a compound VII from the compound VI under the action of methylamine; step 8, preparation of the olatinib; and step 9, preparation of the maleate olatinib: the maleate olatinib is obtained from the olatinib under the action of the maleic acid. The synthesis method is simple and feasible, simple to operate and suitable for industrial production.

The application belongs to the technical field of pharmaceutical chemistry synthesis, and particularly relates to a synthesis method of a fluorofelarana intermediate 2-methyl-4-acetylbenzoic acid. In the application, o-chlorotoluene and acetyl chloride are reacted under the action of anhydrous aluminum chloride to generate 4-chloro-3-methylacetophenone; the 4-chloro-3-methylacetophenone and acetonitrile are catalyzed by Ni to generate 4-acetyl-2-methylbenzonitrile; and then the 4-acetyl-2-methylbenzonitrile is hydrolyzed to generate 2-methyl-4-acetylbenzoic acid. The application has the beneficial effect that acetonitrile is used as a cyanogen to replace halogen, and a highly toxic cyanide is abandoned, so that the whole process is safer and more environmentally friendly, the production of three wastes is reduced, and the synthesis cost of 2-methyl-4-acetylbenzoic acid is greatly reduced.

The invention belongs to the technical field of organic synthesis, and particularly relates to a green synthesis method of electronic-grade 2, 3, 4-trihydroxy benzophenone. The method comprises the following steps: catalytic reaction: taking water as a solvent, uniformly mixing water and a catalyst, adding pyrogallic acid, heating the system to 40-50 DEG C, continuously adding trichlorotoluene, carrying out heat preservation reaction, cooling to 10-15 DEG C after the reaction is completed, crystallizing, separating out and filtering to obtain a crude wet product; and purification treatment: removing impurities from the crude wet product to obtain the high-purity 2, 3, 4-trihydroxy benzophenone. The method does not need reaction in an organic solvent system, is green and environment-friendly, does not need nitrogen protection and is low in production cost, and the prepared 2, 3, 4-trihydroxy benzophenone is high in purity and yield and suitable for industrial processing production.

The utility model discloses a dichlorotoluene production system which comprises an o-chlorotoluene rectifying tower, a 2, 6-dichlorotoluene rectifying tower and a 2, 3-dichlorotoluene rectifying tower which are connected in sequence, the o-chlorotoluene rectifying tower is provided with an o-chlorotoluene outlet and a first inlet for a crude product of a mixture to enter, the 2, 6-dichlorotoluene rectifying tower is provided with a 2, 6-dichlorotoluene outlet, and the 2, 3-dichlorotoluene rectifying tower is provided with a second inlet for a crude product of the mixture to enter. The 2, 3-dichlorotoluene rectifying tower is provided with a 2, 3-dichlorotoluene outlet; the tower top of the 2, 6-dichlorotoluene rectifying tower is provided with a second condenser, the tower kettle of the 2, 6-dichlorotoluene rectifying tower is provided with a second reboiler, the second condenser is provided with a refrigerant inlet and a refrigerant outlet, the second reboiler is provided with a thermal medium inlet and a thermal medium outlet, the thermal medium outlet of the second reboiler is connected with the refrigerant inlet of the second condenser, and the thermal medium outlet of the second reboiler is connected with the refrigerant outlet of the second condenser. And a refrigerant outlet of the second condenser is connected with a thermal medium inlet of the second reboiler. According to the dichlorotoluene production system disclosed by the embodiment of the utility model, the energy consumption of the 2, 6-dichlorotoluene rectifying tower can be greatly reduced, so that the energy consumption of the dichlorotoluene production system is reduced.

The application discloses a continuous separation method of o-chlorotoluene chlorination liquid and a catalyst, which adopts a continuous freezing treatment and filtration method, and first freezes the chlorination liquid to precipitate most of the catalyst, then removes the precipitated catalyst through filtration, and then circulates and evaporates the filtrate to a concentrated liquid, so that the content of the catalyst in the concentrated liquid is 5-10 wt%; after cooling, the concentrated liquid is mixed with the frozen chlorination liquid suspension to be filtered again. The application uses the continuous freezing and filtration method, uses the property that temperature significantly affects the solubility of the catalyst in the chlorination liquid, separates most of the catalyst from the chlorination liquid, removes the remaining catalyst which is not precipitated by freezing through evaporation of the filtrate, and realizes the continuous separation of the insoluble solid catalyst and the o-chlorotoluene chlorination liquid. The application not only avoids the defects that a large amount of waste water containing metal salts is generated in the process of removing the catalyst in the chlorination liquid through the traditional water washing and alkali washing methods, but also realizes the resource recycling of the catalyst.

The present application relates to the synthesis of pesticide compounds, in particular to a method for preparing a pyrasulfotole intermediate. The method comprises: (1) using p-chlorotoluene as a raw material, through nitration, chlorination, hydrolysis, or chlorination, hydrolysis, nitration, to obtain 3-nitro-4-chlorobenzaldehyde, (2) fluorination and reduction of 3-nitro-4-chlorobenzaldehyde to obtain 4-fluoro-3-amino benzaldehyde; (3) 4-fluoro-3-amino benzaldehyde is then contacted with chloroformate for reaction, and then chlorination to obtain compound IV; (4) compound IV is contacted with trifluorobutanamine ester under alkaline conditions for reaction to obtain compound I. The process for preparing compound I avoids using expensive raw material 2-chloro-4-fluorobenzoic acid, effectively reduces the cost of raw materials, reduces the three wastes generated in the process, and at the same time, the total yield of the reaction is high, and it is suitable for industrial mass production.

The present application relates to o-chlorotoluene preparation technical field, specifically to a kind of o-chlorotoluene rectification equipment and its using method, including feed tank, mixing tank and rectifying tank, the outside of feed tank is equipped with first temperature control box, the outside of mixing tank is equipped with second temperature control box, feed tank and mixing tank are connected by first conveying pipe between communication.The present application can be monitored by first temperature sensor and second temperature sensor respectively to the temperature in first temperature control box and second temperature control box, when temperature is higher or lower than set range, third water pump and first solenoid valve are opened by controller, so that cooling liquid in cooling water tank enters first temperature control box and is cooled or heating pipe is arranged in second temperature control box and is heated, without additional temperature control equipment, through reboiler and cooling water tank, energy is recycled, so that raw material is added in more suitable temperature, improve rectification effect, reduce cost.

The present disclosure relates to a process for the preparation of 4-chloro-5-(4-tolyl)-1H-imidazole-2-formonitrile. The methods of the present disclosure are performed under mild reaction conditions. Further, the method of the present disclosure is simple, cost effective and environmentally friendly, and provides 4-chloro-5-(4-tolyl)-1H-imidazole-2-formonitrile with relatively higher purity and higher yield.

The invention provides a method for preparing an intermediate 2, 6-dichloro-3, 5-di-tert-butyl toluene for synthesizing 2, 6-dichlorotoluene, and the method comprises the following steps: (1) first-stage chlorination reaction: in the presence of a solvent, a first catalyst and a first auxiliary agent, reacting 3, 5-di-tert-butyl toluene with chlorine to obtain 2-chloro-3, 5-di-tert-butyl toluene; and (2) a second-stage chlorination reaction: in the presence of a second catalyst and a second auxiliary agent, carrying out a reaction on the 2-chloro-3, 5-di-tert-butyl toluene and chlorine to obtain the 2, 6-dichloro-3, 5-di-tert-butyl toluene.

The application discloses a 2,5-dichlorotoluene isomerization catalyst, wherein the carrier of the catalyst is a multi-stage pore hydrogen type molecular sieve, the active component is zirconium oxide, the cocatalyst is alkaline earth metal oxide, the total loading amount of the zirconium oxide and the alkaline earth metal oxide is 1-5 wt%, the molar ratio of zirconium and the alkaline earth metal is 10:0-0:10, and the multi-stage pore hydrogen type molecular sieve is obtained by modifying a hydrogen type molecular sieve with an organic acid. Through the organic acid dealumination modification, mesoporous channels can be effectively constructed in the molecular sieve crystal, the specific surface area, mesoporous pore size and pore volume of the molecular sieve are increased, the diffusion of macromolecules in the channels is greatly enhanced, and the carbon deposition inactivation of the catalyst is inhibited; the active component can provide more catalytic active sites, improve the catalytic activity of the catalyst, and the cocatalyst has a positive influence on the acidity, carbon deposition and other properties of the catalyst; the highest conversion rate of 2,5-dichlorotoluene reaches 59.14%, and the total selectivity of dichlorotoluene reaches 37.77%.

The present application relates to the field of synthesizing 2,4-dichlorotoluene, and in particular to a method for catalyzing the directional synthesis of 2,4-dichlorotoluene by parachlorotoluene. A method for catalyzing the directional synthesis of 2,4-dichlorotoluene by parachlorotoluene, comprising the following preparation steps: taking parachlorotoluene, a catalyst and an auxiliary agent, mixing, using chlorine as a chlorine source, heat-insulating the reaction, collecting the reactants, separating the reactants and collecting 2,4-dichlorotoluene; the catalyst includes one or more of aluminum chloride, ferric chloride, antimony trichloride and zirconium tetrachloride. The present application adopts a homogeneous catalyst, which has the advantages of stable properties, convenient purchase channels, no need for further processing, low toxicity and high product yield; and the catalyst application system has mature industrial technology, many separation methods, and the convenience and safety of operation can be fully guaranteed, which can not only effectively improve the effect of catalytic synthesis, but also synthesize and separate 2,4-dichlorotoluene with higher purity and yield.

The utility model discloses a tail gas absorption device in trichlorotoluene production, which belongs to the technical field of trichlorotoluene production, and comprises an absorption tank, the left side surface of the absorption tank is fixedly connected with a fixed plate, the left side surface of the fixed plate is fixedly connected with a filter cartridge, the right side surface of the absorption tank is fixedly connected with a support plate, and the support plate is fixedly connected with the filter cartridge. A liquid storage box is fixedly installed on the upper surface of the supporting plate, a liquid pump is fixedly installed on the upper surface of the liquid storage box, the output end of the liquid pump fixedly communicates with a liquid discharging pipe, and the end, away from the liquid pump, of the liquid discharging pipe penetrates through the absorption tank and extends into the absorption tank; and the end, away from the infusion pump, of the liquid drainage pipe fixedly communicates with a liquid drainage spraying disc, and the upper surface of the absorption tank fixedly communicates with a communicating pipe. According to the tail gas absorption device in trichlorotoluene production, organic matters and the like in tail gas can be physically adsorbed, the purpose of removing pollutants is achieved, the tail gas can be efficiently absorbed and treated, and the subsequent treatment requirement of the tail gas can be met.

The utility model provides a rectification device for refining high-purity o-chlorotoluene, and relates to the technical field of rectification devices. The placing base is of a rectangular block structure, and a base body of an annular structure is welded to the left side of the top end face of the placing base. Through the arrangement of the seat body and the electric cylinders, on one hand, when the cover plate needs to be opened, a fixing screw rod on the cover plate is unscrewed, the two electric cylinders are controlled to stretch, and when the two electric cylinders stretch, the cover plate can be jacked up, and opening of the cover plate is achieved; on the other hand, when the spray head seat needs to be maintained, the two electric cylinders are directly controlled to stretch, the distillation barrel is separated from the seat body under the support of the two electric cylinders, at the moment, the spray head seat can be conveniently maintained, and the practicability is high; through the arrangement of the first blocking seat and the second blocking seat, the sealing performance between the distillation barrel and the seat body can be improved, heat dissipation is avoided, and the heating efficiency is guaranteed.

The application discloses a synthesis process of chlorobenzoic acid, and the NiMo-Sb2O3 / TiO2-CeO2-MgO composite catalyst prepared by the method can better prepare ortho-chlorotoluene, has high selectivity and long service life, and has mild process conditions and small carbon deposition amount, so that the application has important significance for improving product quality, reducing production cost and promoting green development of the industry.

The invention discloses a synthesis process of o-chlorobenzonitrile, a NiMo-Sb2O3 / TiO2-CeO2-MgO composite catalyst prepared by the method can better prepare o-chlorotoluene, has the advantages of high selectivity, long service life, mild process conditions and small carbon deposition amount, and has important significance for improving product quality, reducing production cost and promoting green development of the industry.

The invention relates to the technical field of chemical production, in particular to a synthesis process of o-chlorobenzyl chloride, which specifically comprises the following steps: compounding an azo initiator and benzoyl peroxide, adding a free radical catalyst, and dissolving with low-concentration o-chlorotoluene to prepare a catalyst system; the free radical stabilizer consumes high-concentration instant free radicals generated by the azo initiator in the initial stage, reaction out-of-control and temperature runaway are prevented, physical isolation of benzoyl peroxide is achieved through a paraffin wrapping technology, the segmented initiation effect is further improved, dominant starting of the azo initiator in the low-temperature stage is achieved, and the stability of the system is improved. And benzoyl peroxide in a high-temperature section is dominated and maintained, so that the reaction controllability is remarkably improved. A catalyst system and high-purity o-chlorotoluene are added into a photocatalysis tower type reaction device, a blue light lamp is adopted as a light source, and the temperature is increased by stages for chlorination reaction, so that the synthesis process of o-chlorobenzyl chloride, which is capable of realizing segmented controllable initiation, improving reaction selectivity, reducing energy consumption, reducing chlorine consumption and generating polychlorinated impurities, is realized.

The application discloses a chlorantraniliprole reaction mother liquor recovery method and recovery processing equipment, comprising the following steps: S1: K acid and K amine are dissolved in a solvent a; S2: an acid-binding agent b is added, and temperature is controlled to drop methylsulfonyl chloride for condensation reaction; S3: after the reaction is completed, water is added to cool and crystallize; S4: centrifugation is carried out to obtain chlorantraniliprole; S5: after alkalization, the reaction mother liquor is extracted to separate an organic phase; S6: the organic phase is distilled to obtain a distillate main product; and S7: the distillate main product is dehydrated through a molecular sieve. The application has the advantages that: in the chlorantraniliprole synthesis, the selected solvent a and the acid-binding agent b can make the reaction yield greater than 94%; meanwhile, the reaction solvent a can meet the requirements of the reaction, direct separation with water, and extraction and dissolution of the acid-binding agent b in water; in the mother liquor recycling, the selected solvent a and the acid-binding agent b meet the conditions of molecular sieve dehydration, and the recovery rate of the solvent a and the acid-binding agent b is more than 95%.

The invention discloses a system for producing o-(p-) chlorobenzyl chloride by'reacting first and then separating 'mixed o-(p-) chlorotoluene. The invention discloses a process for producing o (p) chlorobenzyl chloride from mixed o (p) chlorotoluene by'reaction-separation ', which comprises the following steps: carrying out side chain photochlorination reaction on the mixed o (p) chlorotoluene and chlorine in a photochlorination reactor, feeding the chlorination liquid into a deacidification tower for degassing operation, feeding the deacidified chlorination liquid into a chlorotoluene removal tower for rectifying to remove the mixed chlorotoluene, and feeding the deacidified chlorination liquid into a dechlorination tower for dechlorination; a tower kettle material enters an o-chlorobenzyl chloride refining tower, an o-chlorobenzyl chloride product is extracted after a tower top material of the o-chlorobenzyl chloride refining tower is condensed, a tower kettle material enters an o-chlorobenzyl chloride removal refining tower, a tower top material of the o-chlorobenzyl chloride removal refining tower is condensed and then returns to the o-chlorobenzyl chloride refining tower, and a tower kettle material enters a p-chlorobenzyl chloride refining tower; and condensing a material at the top of the p-chlorobenzyl chloride refining tower, and extracting a p-chlorobenzyl chloride product. According to the method, the separation difficulty is reduced, and the separation energy consumption is saved.

The utility model relates to the technical field of dichlorotoluene purification, and particularly discloses a dichlorotoluene purification device which comprises a cylinder body, a partition plate is fixedly connected in the cylinder body, a circular groove is formed in the lower end in the partition plate, a flow guide plate is fixedly connected to the lower end of the partition plate, and a cleaning assembly is movably connected to the lower end in the cylinder body. The cleaning assembly comprises a circular shaft movably connected to the interior of the circular groove, a floating plate is fixedly connected to the lower end of the circular shaft, a rotating paddle is fixedly connected to the exterior of the circular shaft, an inner cylinder is fixedly connected to the lower end of the floating plate, a telescopic cylinder is movably connected to the exterior of the inner cylinder, and an outer cylinder is movably connected to the exterior of the telescopic cylinder; in the working process of dichlorotoluene purification, after liquid enters the barrel, the device can scrape materials by taking steam generated by evaporation as power, so that the phenomenon that the heat transfer efficiency and the mass transfer efficiency are influenced by caking in the barrel is avoided, and the working efficiency of dichlorotoluene purification is further improved.

The invention relates to the technical field of chemical synthesis, and discloses a method for preparing o-chlorobenzyl bromide by using photofluid reaction equipment, o-chlorotoluene is used as a raw material, dibromohydantoin bromination reagent and blue light are used as initiators, free radical substitution reaction and post-treatment are carried out to prepare o-chlorobenzyl bromide, the method improves the conversion rate and selectivity of bromination reaction, and the method is suitable for industrial production. The preparation method has the advantages of short synthesis route, simple operation, high yield, capacity improvement, high recovery rate in the crystallization and purification process, yield of 90-93%, cheap and easily available raw materials, simple operation, environmental protection, low comprehensive cost, simplicity, continuous production and the like, and the process is suitable for large-scale production.