42 results about "Dichlorobenzene" patented technology

An attractant for Telenomus remus Nixon to control Spodoptera litura Fabricicus is provided. The attractant includes a solvent and at least one of the following components: 1,3-dichlorobenzene, benzothiazole, and octane. The attractant can effectively attract Telenomus remus Nixon to parasitize Spodoptera litura Fabricius eggs, such that the growth of a pest quantity is inhibited and the pest population gradually dies out, which achieves the purpose of pest control. The attractant is a green, non-toxic, and pollution-free attraction substance. Therefore, the attractant can solve a series of problems such as pesticide residues, environmental pollution, and food safety caused by chemical control, and is of great significance for the green control of Spodoptera litura Fabricius.

This invention provides a method for detecting dichloronaphthalene, a persistent organic pollutant in soil sediments. The method includes: collecting soil sediment samples, pre-treating them by freeze-drying, grinding, and sieving to obtain a sample; extracting and purifying the sample using an organic solvent to prepare a test solution; analyzing and detecting the sample using ultra-high performance liquid chromatography-atmospheric pressure chemical ionization mass spectrometry (UPLC-APCI-MS / MS), and calculating the measured value of dichloronaphthalene in the test solution by substituting the obtained peak area and fractionation ratio into a specific formula. This invention fills the gap in my country's technology for detecting dichloronaphthalene-type persistent organic pollutants in soil sediments. This method can effectively eliminate interference from complex matrices, accurately determine trace amounts of six dichloronaphthalene isomers, and has the advantages of high sensitivity, strong anti-interference ability, simple operation, and high detection accuracy.

The present application relates to aripiprazole synthesis technical field, specifically to a kind of preparation of 1-(2,3-dichlorophenyl) piperazine hydrochloride substantially without following dimer impurity compound (I), the structure of the impurity is determined to clarify the generation mechanism of the impurity, provide the train of thought for better control of the impurity and make corresponding judgment to the impurity derived subsequently, provide help to the quality research of subsequent intermediates and finished products;The present application replaces the existing multiple recrystallization process by means of filtration and salting-out, which can effectively simplify the operation and greatly reduce the use of organic solvents.

This invention relates to a method for determining the migration amounts of 4,4'-biphenyl and 1,1'-sulfonyl di(4-chlorobenzene), belonging to the technical field of migration amount determination. The method includes the following steps: S1: conducting a migration experiment; S2: treating the soaking solution; S3: preparing a chemical substitute solution; taking 2 mL of the chemical substitute reagent (95% ethanol or isooctane) soaking solution obtained after the migration experiment into a 10 mL stoppered graduated glass tube, accurately adding 50 μL of dimethyl sulfoxide, mixing, blowing with nitrogen to near dryness under a 45°C water bath, making up to 2 mL with acetonitrile-water solution (1+1), mixing, filtering through a microporous membrane, and preparing for determination; S4: preparing a blank solution; S5: sample determination; S6: blank determination; S7: verifying the recovery rate and precision of the method using the above blank sample, selecting the detection limit and quantitation limit for two-level experiments at two concentrations.

The application discloses a preparation method of triclabendazole, and relates to the technical field of raw medicine synthesis. The method comprises the following steps: taking 4-chloro-5-(2,3-dichlorophenoxy)-2-nitroaniline as raw material, and sequentially performing reduction in an iron powder ethanol system, ring closure with a sulfur-containing ring closure reagent, methylation with dimethyl sulfate, and crystallization and purification in ethanol to obtain triclabendazole finished products. In the reaction process, iron mud is removed through pressure filtration, ethanol is recovered through distillation, and the ring closure intermediate is precipitated under acidic conditions. The process condition is clear, the operation is simple, the emission of hazardous waste can be reduced, the utilization rate of solvents and the purity of products can be improved, and the method is suitable for industrialized production of triclabendazole raw medicine.

This invention discloses a process and apparatus for the continuous fluorination preparation of 2,6-dichlorobenzonitrile under mild conditions. The apparatus includes sequentially connected units for 2,6-dichlorobenzonitrile preparation, raw material preparation, online dehydration, continuous metering feeding, continuous reaction, and post-treatment, with a supporting control system for precise parameter control. The process first involves the continuous preparation and purification of 2,6-dichlorobenzonitrile at 70–90℃ and 0.1–0.3 MPa. Then, a raw material solution and a fluorination suspension are prepared and deeply dehydrated. Subsequently, a continuous fluorination reaction is carried out at 80–150℃ and 0.1–1.0 MPa. Finally, the finished product is obtained through post-treatment. This invention achieves continuous production throughout the entire process, with mild reaction conditions, a solvent recovery rate ≥95%, a finished product purity ≥99.8%, high production efficiency, low cost, wide equipment adaptability, and easy industrialization.

The utility model relates to the technical field of p - dichlorobenzyl production equipment, concretely is a kind of p - dichlorobenzyl production raw material discharging auger, including auger shell, the one side fixed mounting of auger shell outer surface top is equipped with feed pipe, the one side fixed mounting of auger shell outer surface lower side is equipped with discharge pipe, the inside of discharge pipe is provided with flow sensor, the inside rotation of auger shell is equipped with auger shaft.This one kind of p - dichlorobenzyl production raw material discharging auger, by the cooperation of auger shell, discharge pipe, feed pipe, driving motor, helical blade, auger shaft and flow sensor, by being coated with anti -adhesive coating on the inner wall of auger shell and the surface of helical blade, the adhesion between raw material and auger component surface can be significantly reduced, effectively avoid the occurrence of raw material blocking phenomenon, ensure the smoothness of discharging process, to further improve production efficiency.

The application belongs to the technical field of organic synthesis, and particularly relates to a method for catalytically synthesizing N-substituted-3-methyl indole compounds by using aza carbene oxazoline ring palladium compound. The application aims to provide a new synthesis method for N-substituted-3-methyl indole compounds, specifically, a high-catalytic-activity aza carbene oxazoline ring palladium compound is used as a catalyst to catalyze a direct coupling cyclization reaction of o-dichlorobenzene or o-bromochlorobenzene compounds and allyl arylamine, so as to obtain N-substituted-3-methyl indole compounds. The catalyst used in the application has high catalytic activity, the reaction has good product and functional group compatibility, in addition, the catalyst itself is easy to synthesize, and aryl chlorides used in the synthesis route are cheap and easy to obtain. Therefore, the synthesis route provided in the application has great competitive advantages and industrial production utilization value.

The present application belongs to the technical field of rectification separation, and provides a rectification separation and purification method for preparing high-purity o-dichlorobenzene. The present application adopts the design of loading surface-modified structured packing in the rectification section of the rectification tower. The structured packing is composed of an alumina ceramic matrix and a cross-linked copolymer layer. The cross-linked copolymer layer contains structural units formed by N-vinyl-2-pyrrolidone, 2-hydroxyethyl methacrylate and ethylene glycol dimethacrylate, and is prepared through a silanization and graft cross-linking polymerization process. The rectification tower is operated under the conditions of a tower top absolute pressure of 0.5-20 kPa and a reflux ratio of 2-6. The present application realizes the efficient separation of o-dichlorobenzene products with a purity of not less than 99.9 wt% from dichlorobenzene isomer mixtures, solves the problem that the structured packing in a low-pressure rectification system cannot simultaneously achieve low pressure drop, large flux and high separation efficiency, and the stability of the surface modification layer in a high-temperature organic vapor environment is insufficient, and has wide industrial application value.

This invention relates to a bacterium that degrades chlorobenzene pollutants and its applications. The bacterium is a *Pseudomonas putida* strain, named *Pseudomonas putida* BS-1, deposited at the China Center for Type Culture Collection (CCTCC) with accession number CCTCC M 2024441 on March 11, 2024. Compared with existing technologies, the strain provided by this invention can completely degrade a complex pollutant mixture of dichlorobenzene, chlorobenzene, and benzene within 48 hours. It can survive for a long time and maintain its degradation activity under actual pollution conditions of complex pollution and low temperatures. Furthermore, the functional genes related to the degradation of chlorobenzene pollutants are located on a plasmid, which helps the indigenous bacterium acquire the relevant functions for degrading chlorobenzene pollutants. This strain can be applied to in-situ bioremediation of groundwater with complex chlorobenzene pollution in chemical industrial parks, effectively overcoming the technical shortcomings of traditional reduction dechlorination remediation technologies, which often result in incomplete reduction of products, and achieving green, sustainable, and thorough purification without secondary pollutants.

The present disclosure relates to the technical field of crop protection. The present disclosure primarily to herbicide compositions comprising as compound (A) ethyl [3-[2-chloro-4-fluoro-5-(1-methyl-6-trifluoromethyl-2,4-dioxo-1,2,3,4-tetrahydropy-qrimidin-3-yl)phenoxy]-2-pyridyloxy] acetate (epyrifenacil) and as compound (B) the triethanolamine salt of 2,4-dichlorophenoxy-acetic acid (2,4-D), in particular to formulations of a certain type and preferably containing further constituents, said compositions and formulations having improved properties. The disclosure also relates to methods of manufacturing such compositions and formulations and the use of such compositions and formulations.

The application discloses a traditional Chinese medicine combined medicament for treating 2,4-dichlorophenoxyacetic acid-induced liver injury of livestock and poultry, which is prepared by compounding procyanidin B3, cryptotanshinone and resveratrol, and the three components have synergies and can effectively improve the 2,4-dichlorophenoxyacetic acid-induced liver injury problem of livestock and poultry. The application has simple formula and simple preparation process, can be developed into green and safe liver-protecting veterinary drugs and functional feed, and has good application and popularization value in the field of livestock and poultry breeding.

This invention belongs to the technical field of crystalline materials, and discloses a praseodymium-based complex crystalline material, its preparation method, and its fluorescence recognition application, with the chemical formula {[Pr(L 1.5 The compound is 2,2'-(2,3,5,6-tetramethyl-1,4-phenylene)bis(methylene)bis(sulfonyl)diethyl)benzoic acid. The preparation method involves dissolving Pr(NO3)3·6H2O, H2L, and the auxiliary uncoordinated ligand 1,4-bis(imidazol-1-yl)benzene in a DMF / ethanol / water mixed solvent, reacting at 90°C for 3 days, and then cooling to obtain plate-like crystals. This material is effective against Fe... 3+ It exhibits highly selective and sensitive fluorescence quenching response with a quenching rate of 99.8%; it can specifically recognize ethoxyquinoline (fluorescence enhancement) and 2,4-dichlorophenoxyacetic acid (fluorescence quenching); it can specifically recognize the antibiotic oxytetracycline with a fluorescence quenching rate exceeding 99%.

This invention belongs to the field of resin preparation technology, specifically relating to a polyphenylene sulfide resin and its preparation method. The preparation method includes the following steps: a composite stabilizer, anhydrous sodium sulfide, and a polar solvent are first mixed; the resulting first mixture undergoes a dehydration reaction to obtain a dehydrated reaction solution; the dehydrated reaction solution is then mixed with p-dichlorobenzene; the resulting second mixture undergoes prepolymerization and postpolymerization sequentially to obtain the polyphenylene sulfide resin; the composite stabilizer includes carbodiimide having the structure of formula I, lithium chloride, and sodium hydroxide; R 1 -(N=C=N) n -R 2 Equation I; n is an integer from 1 to 20; R 1 and R 2 The polymer is independently selected from substituted or unsubstituted alkyl, cycloalkyl, aryl, or aralkyl groups. The composite stabilizer in this invention effectively inhibits excessive hydrolysis by polar solvents, improves reaction efficiency, and controls the polymer molecular structure, thereby obtaining high molecular weight, high yield, and high whiteness PPS resin.

The utility model relates to the technical field of chemical production equipment, concretely to the continuous production device of p - dichlorobenzyl, including the chassis, one side of the chassis top is fixed mounting respectively toluene storage jar, chlorine storage jar and catalyst storage jar, the top of chassis is fixed and installs the continuous reaction kettle in one side of chlorine storage jar, this continuous production device of p - dichlorobenzyl, through the cooperation of chassis, toluene storage jar, chlorine storage jar, catalyst storage jar, first pipeline, metering pump, valve, continuous reaction kettle, rectifying column, condenser, tail gas absorption tower, apron, second pipeline, third pipeline and fourth pipeline, adopt continuous reaction kettle to carry out the reaction, avoids the frequent feeding and discharging process in intermittent production, achieves the continuous production of p - dichlorobenzyl, and the production efficiency is improved significantly. With the help of metering pump, the raw material addition amount is accurately controlled, so that the reaction process is more stable.

This invention relates to a method for preparing polyarylene ether nitrile by copolymerizing 2,5-dichlorobenzonitrile and 2,4-dichlorobenzonitrile with mixed diphenols, comprising: mixing 2,5-dichlorobenzonitrile and 2,4-dichlorobenzonitrile in a molar ratio of 1:9 to 9:1, and performing stepwise polycondensation with mixed diphenols in anhydrous potassium carbonate catalysis and an N-methylpyrrolidone / toluene composite solvent system at 140 to 200°C, to obtain a polyarylene ether nitrile with a number-average molecular weight of 35,000 to 80,000 g / mol, a glass transition temperature of 175 to 240°C, a 5% thermal weight loss temperature of not less than 400°C, a tensile strength of 80 to 120 MPa, and a solubility in N-methylpyrrolidone at 25°C of not less than 15 wt%. This invention effectively breaks the regularity and symmetry of the main chain by simultaneously introducing asymmetric benzonitrile ether structural units derived from 2,5-dichlorobenzonitrile and ortho / para-substituted benzonitrile ether structural units derived from 2,4-dichlorobenzonitrile into the polymer main chain, thereby inhibiting early crystallization and precipitation of chain segments during polymerization and achieving stable synthesis of high molecular weight polymers under homogeneous conditions.

The application discloses a kind of solid-state luminescent Schiff base two-dimensional covalent organic framework material and its preparation method and application, belong to material field.The preparation method of the solid-state luminescent Schiff base two-dimensional covalent organic framework material of the present application includes the following steps: the amine with C2 symmetry, DAD, solvent and acetic acid aqueous solution are mixed, and solvent thermal reaction is carried out, to obtain the solid-state luminescent Schiff base two-dimensional covalent organic framework material;The solvent is o-dichlorobenzene and n-butanol.The COFs material prepared in the application has high crystallinity and porosity, and the solid-state absolute luminescence quantum yield is as high as 39%.

The invention relates to chemistry and agriculture, namely to the use of a 1,2,4-triazole derivative as an active compound againstFusarium lateritium.According to the invention, claimed is the use of (Z)-1-(2,4-dichlorophenyl)-3-(2-hydroxyphenyl)-2-(1H-1,2,4-triazol-1-yl)prop-2-en-1-one as an active compound against the phytopathogenic fungus of the speciesF. lateritium- one of the causative agents of root rot.The technical result consists in increasing the fungitoxic activity of the compound of the invention in relation to the closest solution by 6.5…21.6% for strain 17 of the fungusFusarium lateritiumon the last day of cultivation, in the concentration range of 0.02…0.01%, respectively.

This invention discloses a method and continuous production apparatus for polymerizing polyarylene ether nitrile from 2,6-dichlorobenzonitrile and mixed diphenols, belonging to the field of polymer material synthesis technology. The method includes: mixing 2,6-dichlorobenzonitrile with hydroquinone / bisphenol A at a molar ratio of (0.3~0.7):(0.7~0.3), followed by azeotropic dehydration and step-temperature polycondensation in an alkaline catalyst and organic solvent to obtain a polymer viscous liquid; diluting the viscous liquid and spraying it into a 50%~70% ethanol aqueous solution through a high-pressure nozzle to achieve pressurized spray precipitation; subjecting the precipitated solid to multi-stage hot water washing and continuous vacuum drying using a continuous belt filter to obtain the finished product; recovering the solvent from the mother liquor by distillation; and recycling the wastewater after ultrafiltration membrane treatment. This invention effectively balances the rigidity and solubility of the polymer by controlling the ratio of mixed monomers, and significantly improves the heat and mass transfer efficiency of the high-viscosity system by employing pressurized spray precipitation and continuous washing and drying processes, solving the industry pain points of traditional batch precipitation such as easy agglomeration, high solvent residue, and high water consumption.

This invention provides a copper-based covalent organic framework material, its preparation method, and its application. The method comprises: S1, dissolving copper nitrate trihydrate and 1H-pyrazole-4-formaldehyde in a mixed solvent of N,N-dimethylformamide, ultrapure water, and anhydrous ethanol, stirring until homogeneous, heating, cooling, centrifuging, and washing to obtain trinuclear copper complex crystals; S2, mixing the trinuclear copper complex crystals obtained in step S1 with 2,5-diaminobenzoic acid in a mixed solvent of 1,2-dichlorobenzene, n-butanol, and trifluoroacetic acid, ultrasonicating, followed by thawing and degassing via a refrigeration pump, heating for reaction, filtering, washing, and vacuum drying to obtain Cu3-COOH-COF. This invention successfully and stably introduces carboxyl groups into the COFs framework and, through systematic research, confirms that enhanced hydrophilicity can significantly improve the efficiency of CO2 reduction to formic acid—a structure-activity relationship that fills a theoretical gap in the field of COFs photocatalyst interface microenvironment regulation, providing a universal strategy for the design of subsequent high-performance photocatalysts.

A lithium-mediated electrochemical method for ammonia synthesis, relating to the field of ammonia synthesis technology, solves the technical problems of severe side reactions, limited nitrogen mass transfer, and poor interfacial stability in existing lithium-mediated ammonia synthesis systems. Tetra(4-formylphenyl)porphyrin iron and an amino-containing multifunctional organic ligand are added to a mixed solvent of n-butanol and o-dichlorobenzene. An acid catalyst is added, and after stirring until homogeneous, the mixture is degassed and sealed for reaction. The solid product is collected by centrifugation, washed, and dried to obtain COF powder. This powder is then added to an ethanol-water solution, followed by ultrasonic dispersion with Nafion solution. The powder is then drop-coated / sprayed onto the surface of a carbon paper current collector and dried. This powder is used as the working electrode, with a platinum mesh as the counter electrode, a platinum wire as the quasi-reference electrode, and a LiBF4 tetrahydrofuran solution as the electrolyte. Ethanol is used as the proton donor, and electrolysis is performed under a nitrogen atmosphere using a constant current. This invention can be applied to the field of ammonia synthesis technology.

The application belongs to the technical field of organic synthesis, and particularly relates to a Suzuki-Miyaura coupling reaction based on a low-loading palladium catalytic system and using di-tert-butyl phenyl phosphine as a key ligand, which can efficiently prepare substituted biphenyl compounds by using only 0.002% equivalent of palladium catalyst. The method uses 3,4-dichlorobenzene boronic acid and 2-chloro-4-fluoro nitrobenzene as reaction substrates, and uses the synergistic effect of palladium acetate as a transition metal catalyst, di-tert-butyl phenyl phosphine as a ligand and sodium hydroxide as a base to successfully realize Suzuki-Miyaura cross coupling in a green solvent water, and the target is converted into a structure diverse biphenyl compound. The application successfully develops a new process for one-pot synthesis of biphenyl compounds by precisely constructing a palladium catalytic system, which not only has the characteristics of mild reaction conditions and simple operation, but also shows significant technical advantages in economy, substrate universality and process expandability.

This application discloses a multi-electron transfer polynuclear quinoxaline derivative and its synthesis method and application, relating to the field of electrochemical energy storage. The method involves dissolving cyclohexanehexaone octahydrate and 4,5-dichloro-1,2-phenylenediamine or 4-chloro-1,2-phenylenediamine in a mixed solution of glacial acetic acid and anhydrous ethanol. The solution is refluxed and stirred at high temperature under N2 protection for 24 hours. The product is then refluxed and stirred at high temperature in dilute nitric acid for 3 hours to obtain intermediate products HATN-HC or HATN-TC. HATN-HC or HATN-TC, potassium tert-butoxide, mercaptopropionic acid, manganese dioxide, and 15-crown ether-5 are added to anhydrous ethanol. The mixture is stirred and reacted at 70°C under N2 protection for 24 hours. The product is filtered, washed, and acidified, then dried at 60°C in a vacuum oven to obtain HATN-HSPA or HATN-TSPA. The application of the multi-electron transfer polynuclear quinoxaline derivative in alkaline aqueous organic flow batteries is also discussed.

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.

This application discloses a method for synthesizing 2,6-difluorostyrene, belonging to the field of organic chemical synthesis technology, including the following steps: (1) 2,6-dichlorobenzonitrile undergoes a halogen exchange fluorination reaction with a fluorinating agent in a polar aprotic solvent to obtain 2,6-difluorobenzonitrile; (2) the obtained 2,6-difluorobenzonitrile undergoes an addition reaction with methyl magnesium halide in an inert solvent, followed by hydrolysis to obtain 2,6-difluoroacetophenone; (3) the obtained 2,6-difluoroacetophenone undergoes a carbonyl reduction reaction in a solvent to obtain 1-(2,6-difluorophenyl)ethanol; (4) the obtained 1-(2,6-difluorophenyl)ethanol undergoes a dehydration reaction in an alkane solvent under protic acid catalysis to obtain 2,6-difluorostyrene. This synthesis method has the advantages of inexpensive and readily available raw materials, good atom economy, simple reaction operation, high synthesis yield, and good product purity, making it suitable for industrial application.

A toner, comprising a toner particle comprising a binder resin, wherein the binder resin comprises an amorphous polyester and a crystalline polyester; (i) a weight-average molecular weight of a soluble matter of the crystalline polyester in o-dichlorobenzene at 100° C. is 1500 to 4900; (ii) the crystalline polyester comprises a modified crystalline polyester having at least one terminal-modified structure selected from among a structure in which a hydroxy group at a main chain terminal of the crystalline polyester is terminal-modified with a C16 to C31 aliphatic monocarboxylic acid, and a structure in which a carboxy group at a main chain terminal of the crystalline polyester is terminal-modified with a C15 to C30 aliphatic monoalcohol; and (iii) a content ratio of the terminal-modified structure in the crystalline polyester is 80.0 mol % or higher.

This invention discloses a method for synthesizing polyarylene ether nitrile using 2,6-dichlorobenzonitrile and diphenol, belonging to the field of polymer synthesis technology. The key to this method lies in: firstly, subjecting the 2,6-dichlorobenzonitrile and diphenol obtained by gas-phase ammonia oxidation to deep dehydration, degassing, and adsorption pretreatment, reducing moisture and trace amounts of ammonia / chloride to below 50 ppm; then, in a composite phase transfer catalytic system and an aprotic polar solvent, undergoing a programmed temperature-increased nucleophilic substitution polymerization reaction at a specific molar ratio; after the reaction, employing multi-stage washing precipitation and solid-liquid separation technology to efficiently remove inorganic salt byproducts, and achieving the recycling of solvent and catalyst residues. This invention effectively suppresses nitrile hydrolysis and chain termination side reactions, significantly improving the polymer molecular weight and purity.