31 results about "Dichlorophenol" patented technology

This invention discloses an extraction solvent recovery device for reducing the unit consumption of dichlorophenol (oxadiazon), belonging to the field of chemical equipment. The device includes: an extraction vessel, rotatably connected to a stirring shaft, with a partition plate attached to the inner wall of the extraction vessel. The partition plate has several evenly distributed sedimentation ports. A lifting frame is slidably connected to the stirring shaft, with sealing plates corresponding to each sedimentation port. A lifting assembly is connected to the partition plate, and the lifting assembly is driven by a drive mechanism. This assembly moves the lifting frame and the sealing plates, sealing the sedimentation ports and thus isolating the upper and lower layers of liquid within the extraction vessel, allowing for the extraction of the upper layer. Simultaneously, by isolating the upper and lower solutions within the extraction vessel, the device effectively improves the convenience and efficiency of phenol recovery, solving the problem of high unit consumption of dichlorophenol in existing solutions.

The present application relates to a kind of high efficiency energy-saving preparation process of phloroglucinol.The preparation process uses phenol as raw material, generates 2,6-dichlorophenol and dichlorophenol isomer through chlorination reaction, then is alkaline hydrolysis and acidification into product phloroglucinol, after the intermediate dichlorophenol is generated in the chlorination reaction of raw material phenol, it is not concentrated and separated, directly add base to carry out alkaline hydrolysis reaction, realize chlorination-alkaline hydrolysis two-step reaction continuous production.The present application uses alkaline hydrolysis reaction to also convert the original dichlorophenol isomer impurity in situ into product phloroglucinol, realizes waste to treasure, improves yield about 8-10%;In the preparation process, 2,6-dichlorophenol intermediate is not separated, it is directly used in the next step alkaline hydrolysis reaction, the operation unit such as the solvent, crystallization, centrifugation, drying, packaging etc. for its concentration replacement is saved, at the same time, the pungent odor generated in the large production process of 2,6-dichlorophenol is fundamentally avoided, and the environmental pollution problem in the production process of phloroglucinol is avoided.

The invention discloses a method for detecting phenyl sulfide in rectification residual liquid of 2, 4-dichlorophenol through high performance liquid chromatography, and belongs to the technical field of chemical detection and analysis. The method comprises the following steps: dissolving a to-be-detected 2, 4-dichlorophenol rectification residual liquid sample to prepare a to-be-detected sample, and preparing phenyl sulfide standard substance solutions with different concentrations; the method comprises the following steps: determining a to-be-detected sample and a phenyl sulfide standard substance solution by adopting a high performance liquid chromatograph, drawing a standard curve and a linear regression equation according to a detection result of the phenyl sulfide standard substance solution, and analyzing the phenyl sulfide in the sample by combining the linear regression equation and a chromatographic peak map of the to-be-detected sample, wherein the mobile phase comprises a phase A and a phase B, the phase A is an aqueous solution of phosphate buffer salt, the phase B is methanol, and an isocratic elution mode is adopted. According to the present invention, with the method, the accurate determination of the phenyl sulfide content in the 2, 4-dichlorophenol rectification residual liquid is achieved, the timely and accurate data guidance is provided for the 2, 4-D production process, and the target of production cost saving is ultimately achieved.

This utility model discloses an apparatus for preparing 2,4,4'-trichloro-2'-nitrodiphenyl ether, relating to the technical field of 2,4,4'-trichloro-2'-nitrodiphenyl ether production apparatus. The inlet of the reaction vessel is connected via pipelines to a 2,4-dichlorophenol tank, a 2-nitro-4-chlorophenol tank, a sodium hydroxide tank, and an N,N-dimethylformamide tank. The outlet of the reaction vessel is connected via pipelines to an extraction tank. The inlet of the extraction tank is connected via pipelines to a deionized water tank and an ethyl acetate tank. The outlet of the extraction tank is connected via pipelines to an organic phase tank. The outlet of the organic phase tank is connected via pipelines to a drying tank. The inlet of the drying tank is connected via pipelines to an anhydrous sodium sulfate tank. The outlet of the drying tank is connected via pipelines to a vacuum distillation tank. The bottom outlet of the vacuum distillation tank is connected via pipelines to a product tank. The process is simple, and the product yield and purity are high.

The invention discloses a desorption regeneration method of chlorinated phenol adsorption resin, which comprises the following steps: adsorbing 2, 4-dichlorophenol by using macroporous adsorption resin to obtain a byproduct 5-crude hydrochloric acid, then respectively carrying out desorption regeneration by using a first regenerant and a second regenerant, washing the obtained resin with water, and recycling to adsorb impurities in the crude hydrochloric acid. And the first regenerant and the second regenerant can be uniformly collected, separated and recycled. According to the method, methylbenzene and alcohol substances are respectively used as regenerant, efficient desorption and regeneration of the macroporous adsorption resin containing impurities such as chlorophenol are realized, and the method is simple, low in cost and capable of meeting environmental protection requirements.

The invention provides a method for resource utilization of 2, 4-dichlorophenol rectification residual liquid, and belongs to the technical field of chemical production waste treatment. According to the method, the 2, 4-dichlorophenol rectification residual liquid is used as a raw material, and the 2, 4, 6-trichlorophenol component and the phenyl sulfide catalyst are effectively separated from the 2, 4-dichlorophenol rectification residual liquid through sectional distillation operation and optimization of distillation conditions, the cyclic utilization proportion of the phenyl sulfide catalyst and the use amount of a Lewis acid catalyst, so that the 2, 4, 6-trichlorophenol and the phenyl sulfide catalyst are effectively separated from the 2, 4-dichlorophenol rectification residual liquid. According to the method, the content of 2, 4-dichlorophenol in the chlorinated liquid obtained by efficiently recycling the 2, 4, 6-trichlorophenol component and recycling the polyphenylene sulfide catalyst is greater than 96%. According to the method, the production efficiency is improved, the 2, 4-dichlorophenol rectification residual liquid needing to be treated is reduced, and the production cost is remarkably reduced; the method is simple to operate and easy to implement, avoids complex operation steps in an existing recovery method, effectively solves the problems of high cost and poor adaptability of a traditional process, and provides powerful support for large-scale industrial production and application.

The application provides a surgical auxiliary instrument material with bacteriostatic performance and a preparation method thereof, relates to the technical field of bacteriostatic medical instruments, and comprises the following steps: heating and mixing polyethylene, polycaprolactone, styrene-butadiene block copolymer and a bacteriostatic precursor to obtain a mixture of the surgical auxiliary instrument material with bacteriostatic performance, and the raw materials of the bacteriostatic precursor include flax lignan, 4-vinyl-2,6-dichlorophenol and imino methacrylate. In view of the problem of poor wear resistance of the bacteriostatic surgical auxiliary instrument, the bacteriostatic precursor with high polymer coating flax lignan is prepared, the compatibility of flax lignan and the remaining high molecular materials (polyethylene, polylactic acid, styrene-butadiene block copolymer) is improved, the interface bonding performance is improved, the synergistic effect between flax lignan and other materials is exerted, the antibacterial substance is no longer a heterogeneous phase particle in the bacteriostatic surgical instrument, and the continuity, wear resistance and oxidation resistance of the whole material are maintained.

The invention discloses a preparation method and application of a pH-responsive multi-enzyme active fluorescent nano-enzyme, and belongs to the technical field of nano-enzyme preparation and application research. The multi-enzyme active fluorescent nano-enzyme is prepared by taking D-tryptophan or L-tryptophan, silver nitrate and chloroauric acid as raw materials and adopting a heating reflux method, and the preparation process is simple and convenient to operate, green, mild, stable and efficient. The prepared multi-enzyme active fluorescent nano-enzyme not only has strong blue fluorescence, but also shows excellent multi-enzyme activity, including oxidase, laccase and catecholase, and switching of the three enzyme activities can be realized by adjusting pH. In addition, the method is applied to quantitative detection of malathion and 2, 4-dichlorophenol by utilizing the characteristics of different enzyme activities.

The present application relates to a simple preparation method of p-chlorophenol, which comprises the following steps: putting phenol into a four-necked flask, adding dichloromethane, stirring and dissolving, then adding a catalyst, slowly dropping chlorinating reagent, pouring the solution in the four-necked flask into a quenching kettle after the reaction is completed, adding water again, separating layers, discarding the water layer, removing dichloromethane to obtain a crude p-chlorophenol, wherein the weight ratio of raw materials is catalyst: phenol: water: chlorinating reagent: dichloromethane = 1:120:40:172:780; sending the crude product into a rectification kettle for rectification, receiving main fraction p-chlorophenol when the tower top is 65 DEG C; the yield is 82%, and the purity is 99.6%. The advantages are that p-chlorophenol is synthesized by taking phenol as a starting raw material and taking sulfuryl chloride as a chlorinating reagent at a temperature of 40-50 DEG C; the method is reasonable, the operation is simple, the yield is high, and the purity meets the quality research requirements. By rechlorination, the by-product o-chlorophenol can be changed into 2,4-dichlorophenol, and the by-product can be used for production.

A functionalized graphene oxide nitrile rubber and A tooth-scar-free tooth block is provided. The functionalized graphene oxide nitrile rubber comprises the following components in parts by weight: 100-140 parts of nitrile rubber, 30-90 parts of a functionalized graphene oxide nitrile rubber masterbatch, 1.8-2.52 parts of a vulcanizing agent, 1.2-1.68 parts of a vulcanization accelerator, 5-7 parts of a vulcanization activator, 17-23.8 parts of a plasticizer, 2-2.8 parts of antioxidant, 59-86.6 parts of a filler, 0.1-0.14 parts of a curing agent, and 2-2.8 parts of dichlorophenol. The functionalized graphene oxide nitrile rubber above has excellent mechanical properties, a wide applicable temperature range and strong stability in use, and can be prepared into a tooth-scar-free tooth block.

This invention belongs to the field of organic synthesis, specifically relating to a method for preparing 2,6-dichlorofluorobenzene, comprising: phenol and a chlorination reagent. N Chlorosuccinimide undergoes a chlorination reaction in the presence of a Pd catalyst and 1,10-phenanthroline-5,6-dione to produce 2,6-dichlorophenol. 2,6-Dichlorophenol, fluorinating agent NFSI, photocatalyst 4-CzIPN, and an ionic liquid undergo a deoxyfluorination reaction under blue LED irradiation to produce 2,6-dichlorofluorobenzene. This invention offers high product yield and purity, mild reaction conditions, and avoids the use of hazardous raw materials, making it suitable for industrial production.

The invention discloses a reaction proportioning device for reducing unit consumption of dichlorophenol as an oxadiazon raw material, and belongs to the field of oxadiazon production. The device comprises a storage tank and a tank cover, wherein the top of the storage tank is of an open structure; the tank cover fixedly covers the top opening of the storage tank; the tank cover is connected with a pressurizing mechanism; a bearing column is vertically inserted into the tank cover; the lower end of the bearing column extends to the bottom of the storage tank; a discharge channel is vertically formed in the bearing column; the discharging channel penetrates through the lower end face of the bearing column. And the upper end part of the bearing column is connected with an output pipeline communicated with the discharge channel. The dichlorophenol is stored in the storage tank, the pressurizing mechanism is used for inputting air to the top of the storage tank to promote the air pressure in the storage tank to be increased, and then the dichlorophenol in the storage tank is pressed into the output pipeline through the discharging channel, so that the feeding continuity and stability of the dichlorophenol are improved; moreover, the feeding precision of the dichlorophenol is also ensured, and meanwhile, the proportioning effect of the dichlorophenol during the production of the oxadiazon is also ensured.

This invention relates to a rare-earth-selenium tungsten oxide nanocluster material functionalized with mixed organic ligands, the chemical formula of which is [HDMEA]. 9 Na 12 H3[Ce6(DMEA)3(H2O)9W9(HTA)6O 18 (SeW9O 33 [6]ˑ81H2O, where DMEA = N,N-dimethylethanolamine and H3TA = hydroxymalonic acid. This material is prepared by a one-step self-assembly reaction of sodium tungstate dihydrate, N,N-dimethylethanolamine, sodium selenite, hydroxymalonic acid, and cerium nitrate hexahydrate in aqueous solution. The experimental operation is simple and the cost is low. This material can be used as a polyanionic polymer to form a thin film material by layer-by-layer assembly with positively charged chitosan. This multilayer film can be used as a sensitizing material to combine with polypyrrole containing template molecules (2,4-dichlorophenol) to form a molecularly imprinted polymer. This polymer can be used to construct an electrochemical sensor for detecting 2,4-dichlorophenol. Experimental results show that this electrochemical sensor has high sensitivity, strong stability, a wide detection range (1 μM–1 mM), and a low detection limit (0.125 μM).

The utility model discloses a triclosan preparation device relates to triclosan production technical field, including first reactor, the inlet of first reactor is respectively through pipeline intercommunication with 2,4 - dichlorophenol jar, sodium hydroxide solution jar, xylene jar I and tetrabutyl ammonium bromide jar, the outlet of first reactor is through pipeline intercommunication with second reactor, the inlet of second reactor is respectively through pipeline intercommunication with 2 - chloro - 5 - nitrobenzene methyl ether jar, dilute hydrochloric acid solution jar, ZnCl2 - Al2O3 solid acid jar, nano TiO2 jar and xylene jar II, the outlet of second reactor is through pipeline intercommunication with third reactor, the inlet of third reactor is through pipeline intercommunication with acetic acid jar, the top gas phase export of third reactor is through pipeline intercommunication with first condenser, and the outlet of first condenser is through pipeline intercommunication with crude product jar, improves the yield of product.

The application relates to a two-dimensional covalent organic framework material based on Fe doping and bipyridine ligands, a preparation method and application thereof, and belongs to the technical field of covalent organic framework materials. N,N,N',N'-tetra-(p-aminophenyl)-p-phenylenediamine (TAPD) and 2,2'-bipyridine-5,5'-diformyl (BPDA) are used as ligands to synthesize JLNU-305, and JLNU-305-Fe is obtained after reaction with ferrous sulfate heptahydrate, which has multiple active sites (Fe 2+ , Fe 3+ and pyridine N), and exhibits excellent catalytic performance in the activation of sodium persulfate (PDS) for the degradation of 2,4-dichlorophenol (2,4-DCP) under room temperature conditions. At room temperature, 10mg / L of 2,4-dichlorophenol can be removed at a removal rate of 100% by JLNU-305-Fe in only 8min, and the performance is far superior to that of inorganic or organic porous organic polymers, and the JLNU-305-Fe has good reusability.

The invention relates to a preparation method of an MCM-41 molecular sieve containing iron and titanium, the molecular sieve and application of the molecular sieve, coal gasification coarse slag and coal gasification fly ash are reacted under the supercritical reaction condition, then hydrothermal crystallization and roasting are carried out, the MCM-41 molecular sieve containing iron and titanium is efficiently synthesized, the obtained MCM-41 molecular sieve containing iron and titanium is large in specific surface area, and the specific surface area of the MCM-41 molecular sieve containing iron and titanium is larger than that of the MCM-41 molecular sieve containing iron and titanium. And the catalyst contains components with photocatalytic activity, so that 2, 4-dichlorophenol in wastewater can be efficiently removed by combining adsorption and photocatalysis. According to the invention, resource utilization of solid wastes is realized, and products with high added values are obtained.

The application discloses a preparation method of 2,4-dichlorophenoxyacetic acid synthesized by composite molecular sieve ZSM-5 and a water-reducing process, and relates to the following steps: under alkaline conditions, 2,4-dichlorophenol is reacted with a sodium chloroacetate solution under the catalysis of a composite molecular sieve catalyst to obtain 2,4-dichlorophenoxyacetic acid sodium salt crude product through condensation; and then hydrolysis and hydrochloric acid acidification are carried out to obtain 2,4-dichlorophenoxyacetic acid product. The process can reduce energy consumption, shorten reaction time and reduce production cost in obtaining 2,4-dichlorophenoxyacetic acid, and can improve the conversion rate and yield of the product and the color of the product. When a new batch of 2,4-dichlorophenoxyacetic acid sodium salt crude product is dissolved in the acidification reaction, the washing water of the last batch of 2,4-dichlorophenoxyacetic acid is used as the solvent reaction liquid, and the washing water of the last batch is used for the first water washing of the final product and is used in turn. The water consumption is reduced, the wastewater treatment cost is reduced, the conversion rate and yield of the product are improved, the product has high purity, the process is simple, the conditions are mild, and the raw materials can be recycled.

The invention discloses an esterification kettle for oxadiazon herbicide production, and belongs to the field of reaction kettle devices. The esterification kettle comprises a lower kettle body, a cooling jacket is arranged on the outer surface of the lower kettle body, and an annular cooling cavity internally provided with a cooling coil is formed by the cooling jacket and the lower kettle body; the bottom and the top of the cooling jacket are respectively communicated with a water inlet pipe and a water outlet pipe; the top and the bottom of the cooling coil are respectively communicated with a water inlet joint and a water outlet joint; the water inlet pipe and the water outlet pipe are respectively communicated with the outlet end and the inlet end of the circulating oil supply mechanism; and the water inlet joint is communicated with the cooling water supply mechanism. The heat conduction oil circulating system and the independent cooling coil pipe are integrated in the annular cooling cavity on the outer side of the lower kettle body, heat conduction oil is responsible for stably removing basic heat in a large area, the built-in cooling coil pipe can provide stronger and quicker local cooling capacity, and when instantaneous temperature rise is caused by violent heat release of phosphorus oxychloride and dichlorophenol, the heat conduction oil circulating system and the independent cooling coil pipe can be rapidly cooled. The cooling coil is used for improving the cooling effect on the top of the reaction system.

The application relates to a preparation method and activity verification method of a mixed valence MOF material with laccase activity. The application belongs to the field of biomimetic catalysis. The application aims to solve the technical problem of low catalytic activity of existing laccase enzyme simulation materials. The application designs a kind of Cu + / Cu 2+ The application has the advantages of simple process, mild conditions, and the obtained Cu + / Cu 2+ The HKUST-1 material has higher laccase activity than the current Cu 2+ The enzyme simulation material has the potential of higher laccase activity, the catalytic activity of 2,3-dichlorophenol is up to 1.4 times that of the equal mass commercial laccase, has the advantages of high efficiency and low cost, and has good industrial application prospect. The application can be widely used for oxidizing phenolic compounds.

This invention discloses a method for constructing a Fe(FeS)C / PI catalytic oxidation system for wastewater with dual active sites. This system uses iron-based metal-organic frameworks (Fe-MOFs) as precursors, and obtains a Fe(FeS)C ternary composite structure through solvothermal reaction and calcination. This structure is then added to a mixed solution of PI and 2,4-dichlorophenol. In this invention, zero-valent iron (FeS)C is used as the precursor. 0 ) serves as the core active site, through valence cycling (Fe 2+ / Fe 3+ Activation of PI to generate IO3 ‑ And high-valence iron-oxygen species, while FeS regulates electronic structure and promotes Fe 2+ The invention regenerates and enhances PI adsorption, with the carbon skeleton serving as a conductive carrier to disperse active sites and inhibit aggregation. The preparation method of this invention is simple and the process is easy to control. The constructed catalytic oxidation wastewater system can achieve a 100% removal rate of 2,4-dichlorophenol in the pH range of 3 to 9, and has strong resistance to anion interference, combining heterogeneous catalytic stability and environmental friendliness.

The invention discloses a preparation method of a Cu-MOF (at) PDA nano enzyme and application of the Cu-MOF (at) PDA nano enzyme in chromium detection. According to the preparation method, a polydopamine modified copper-based metal organic framework (Cu-MOF (at) PDA) nano-enzyme is synthesized through a simple solvothermal method and an auto-polymerization method, the Cu-MOF (at) PDA nano-enzyme has rich oxygen vacancies, so that the Cu-MOF (at) PDA nano-enzyme has excellent laccase-like activity, 2, 4-dichlorophenol (2, 4-DP) and 4-aminoantipyrine (4-AP) can be oxidized into red antipyrine quinoneimine, and the nano-enzyme can be used for preparing a nano-enzyme with high laccase-like activity. According to the preparation method, the Cu-MOF (at) PDA nano-enzyme is used as a substrate, the catalytic activity of the Cu-MOF (at) PDA nano-enzyme is further remarkably improved by utilizing ultrasound (US), a free radical capture test shows that < 1 > O2 and. OH are remarkably improved and the electron transfer rate is increased under the stimulation of US, so that the catalytic activity is improved, and then the catalytic activity of the Cu-MOF (at) PDA nano-enzyme is inhibited by utilizing the interaction of Cr (III) and the Cu-MOF (at) PDA nano-enzyme, so that the Cu-MOF (at) PDA nano-enzyme is obtained. And a novel method for rapidly detecting Cr is established. The method has the characteristics of simplicity in operation, high sensitivity (the detection limit can reach 0.26 mu g / L), rapidness and the like.

The invention discloses an HPV-E6 protein three-signal output immunoassay method based on near infrared laser induction. According to the immunization method, an integrated paper base is used as a magnetoelastic chip, and Cu NCs (at) MnO2 is used as a multifunctional probe. The efficient photo-thermal conversion efficiency of the Cu NCs (at) MnO2 is utilized to convert light energy into heat energy, and output of temperature signals is achieved. And secondly, the Cu NCs (at) MnO2 has good laccase catalytic activity and can catalytically oxidize 2, 4-dichlorophenol (2, 4-DP), so that an oxidation product of 2, 4-DP and 4-aminoantipyridine (4-AP) react to generate a red substance, and color visual output is realized. Besides, the Cu NCs (at) MnO2 has excellent microwave absorption performance, and dielectric loss and interface polarization phenomena exist between the Cu NCs (at) MnO2 and the Cu NCs (at) MnO2, so that the change of a frequency signal can be caused. Under the irradiation of 808 nm near-infrared laser, the colorimetric amplification and the amplification of temperature and frequency signals are realized. The multi-signal output immunoassay method based on near-infrared laser induction based on the series of phenomena is successfully constructed. The immunoassay has a relatively wide application prospect in early diagnosis of diseases.

The invention discloses an electrochemical sensor as well as a preparation method and application thereof, and relates to the technical field of sensors. The electrochemical sensor comprises a working electrode, a reference electrode and a counter electrode, wherein the surface of the working electrode of the electrochemical sensor contains a nano composite material; the nano composite material comprises a nitrogen-doped carbon-coated ferric oxide material and conductive nano particles. The electrochemical sensor disclosed by the invention has high sensitivity and high stability, has strong adsorption capacity on a target object when being applied to the field of detection, is small in relative standard deviation of test results obtained after being placed for different days, is particularly suitable for detection of 2, 4-dichlorophenol, and has the advantages of wide detection linear range, high sensitivity and the like.

The application discloses a preparation method of a PFC-1-UiO-66 heterojunction nanoscale enzyme and application thereof in catechol multi-mode detection, and relates to the technical field of biochemical analysis and examination. The method comprises the following steps: dissolving cerium salt in a mixed solvent, heating and reacting, adding DMF in which terephthalic acid is dissolved into ice water after cooling, and obtaining UiO-66 through reaction; dissolving 1,3,6,8-tetra(4-carboxyphenyl)pyrene in DMF, adding UiO-66, heating and reacting, cooling after reaction, adding acetone and stirring, and obtaining the heterojunction nanoscale enzyme through centrifugation, washing and drying. The detection reagent constructed based on the heterojunction nanoscale enzyme can react with TMB under acidic conditions to realize 652 nm colorimetric detection, can react with 2,4-dichlorophenol / 4-aminoantipyrine under neutral conditions to realize 510 nm colorimetric detection, and can generate a photothermal signal through 808 nm near-infrared light irradiation to realize dual-mode detection of colorimetry and photothermal effect. The application has the advantages of high detection sensitivity, strong anti-interference and good stability.

This invention discloses a plasma metal Bi / oxygen vacancy-BiOBr photocatalytic material, its preparation method, and its applications. The preparation method includes the following steps: dissolving a bromide salt in 1,2-propanediol to obtain a dispersion; adding a bismuth salt to the dispersion and mixing thoroughly to obtain a reaction solution; subjecting the reaction solution to a hydrothermal reaction; and cooling, separating, washing, and drying the resulting material to obtain the target product. This invention uses 1,2-propanediol as a solvent and a reducing agent, simultaneously introducing plasma metal Bi and oxygen vacancies into BiOBr through a hydrothermal reaction to enhance its catalytic performance. Furthermore, the addition of lignin to the reaction system further promotes the formation of plasma metal Bi and oxygen vacancies. The material prepared by this invention can be used for the oxidation-reduction of 2,4-dichlorophenol in water and for CO2 reduction, effectively remediating the environment and achieving energy conversion, showing great application potential.

The invention discloses a preparation method of 2, 4, 4 '-trichloro-2-hydroxy-diphenyl ether, which comprises the following steps: taking 2, 4-dichlorophenol with a chemical structural formula as shown in a formula (1) and 2, 5-dichloroacetophenone as shown in a formula (2) as raw materials, and reacting under the action of a copper salt catalyst, an organic ligand and alkali to obtain a compound 3 with a structural formula as shown in a formula (3); and oxidizing the compound 3, and hydrolyzing to obtain the 2, 4, 4 '-trichloro-2-hydroxy-diphenyl ether with a structural formula as shown in a formula (5). According to the invention, 2, 4-dichlorophenol and 2, 5-dichloroacetophenone are used as raw materials, and the method has the characteristics of simple synthesis, high conversion rate, few reaction byproducts and short steps; in addition, the method disclosed by the invention has the characteristics of few reaction steps, simplicity in operation, high yield and the like, so that the method has a wide application prospect.

This invention discloses a method for synthesizing ethyl bromide thiophosphate based on ethyl and propyl skeletal intermediates, belonging to the field of organophosphorus pesticide synthesis technology. The method includes the following steps: In the presence of an inert organic solvent and a base, O-ethyl-S-propylthiophosphoric acid dichloride and 4-bromo-2,5-dichlorophenol are reacted via a one-pot condensation reaction to obtain ethyl bromide thiophosphate. The chemical reaction formula is: O-ethyl-S-propylthiophosphoric acid dichloride + 4-bromo-2,5-dichlorophenol → base ethyl bromide thiophosphate. This invention uses O-ethyl-S-propylthiophosphoric acid dichloride as the key intermediate, avoiding the atomic waste of traditional processes; the one-pot condensation process simplifies the process, with only hydrogen chloride and water as byproducts; the yield is ≥92%, the purity is ≥96%, and waste emissions are reduced by more than 50%. By pre-constructing intermediates with ethyl and propyl skeletal frameworks and combining them with the one-pot condensation process, a highly efficient and environmentally friendly synthesis is achieved.

The invention relates to a hierarchical pore MCM-41 molecular sieve and a preparation method and application thereof.The preparation method comprises the steps that coal gasification coarse slag reacts under the subcritical reaction condition, then hydrothermal crystallization and roasting are conducted, the hierarchical pore MCM-41 molecular sieve is efficiently synthesized, and the obtained hierarchical pore MCM-41 molecular sieve is large in specific surface area, has a hierarchical pore structure and contains components with photocatalytic activity; the 2, 4-dichlorophenol in the wastewater can be efficiently removed through the combination of adsorption and photocatalysis. According to the invention, resource utilization of solid wastes is realized, and products with high added values are obtained.

Disclosed is a reduced graphene oxide nitrile rubber, comprising the following components in parts by weight: 100-140 parts of nitrile rubber, 30-90 parts of a reduced graphene oxide nitrile rubber masterbatch, 1.8-2.52 parts of a vulcanizing agent, 1.2-1.68 parts of a vulcanization accelerator, 5-7 parts of a vulcanization activator, 17-23.8 parts of a plasticizer, 2-2.8 parts of antioxidant, 59-86.6 parts of a filler, 0.1-0.14 parts of a curing agent, and 2-2.8 parts of dichlorophenol. The reduced graphene oxide nitrile rubber has excellent mechanical properties, a wide applicable temperature range, and strong stability in use, which excellently addresses the poor mechanical properties of the nitrile rubber in the prior art due to high temperature in use and the interfacial compatibility issue between the filler and the rubber.

The application discloses a method for removing phenolic pollutants in situ by frozen reinforced persulfate, which accelerates the removal of trace phenolic pollutants in soil or groundwater through the creation of ice crystal interface under natural low-temperature freezing conditions and the physical and chemical effects of ice freezing and concentration. The application is characterized in that only manganese oxide (such as beta-type manganese dioxide (beta-MnO2), gamma-type manganese dioxide (gamma-MnO2) and delta-type manganese dioxide (delta-MnO2)) needs to be added to soil or groundwater before the freezing season, and a persulfate (PS) solution is injected to build a manganese oxide-persulfate system. After freezing, the manganese oxide will form a high-activity surface complex MnO2-PS with the persulfate molecules * The complex can accelerate the removal of phenolic pollutants such as bisphenol A and 2,4-dichlorophenol through electron transfer. The technology is simple, efficient, environmentally friendly and low-cost, and is suitable for the removal of trace pollutants in high-altitude and high-cold areas.