410 results about "Coupling reagent" patented technology

The invention relates to a preparation method and application of high-temperature-resistant organic modified bentonite. According to the method, three organic modifiers of long-chain quaternary ammonium salt, amide and a silane coupling agent are compounded to modify bentonite, and the problem that a single modifier is easy to decompose at high temperature is solved through the synergistic effect of physical intercalation, chemical crosslinking and interface bonding; and secondly, a three-dimensional stable structure is constructed by adding nano silicon dioxide and a composite modifier, so that the high temperature resistance and dispersion stability of the modified bentonite are further enhanced. According to the invention, the requirements of deep well and ultra-deep well drilling fluids on the temperature resistance and rheological property of the treating agent can be met, and the ultra-deep well drilling fluid which can tolerate the high temperature of 250-300 DEG C, and is low in filter loss and good in dispersion stability can be obtained.

The invention provides a polyimide multilayer composite membrane material as well as a preparation method and application thereof, and belongs to the technical field of gas separation. According to the method, through collaborative design of a functional support layer, a gradient MOF layer and an ultrathin selection layer structure, the problems of support layer pore seepage, MOF agglomeration, weak interface bonding and the like in an existing composite membrane material are solved. The preparation method comprises the following steps: firstly, carrying out electrostatic spinning on a polyamide acid glue solution, and synchronously introducing dopamine by adopting a chemical imidization method to prepare a functionalized polyimide fiber membrane containing hydroxyl and amino on the surface, so that the mechanical property of a supporting layer and the MOF anchoring capability are remarkably improved; growing MOF layers with different particle sizes on the surface of the fiber membrane by regulating and controlling the concentration gradient of ligand / metal salt and the reaction time, and passivating through a silane coupling agent after each step of growth so as to avoid heterogeneous nucleation and construct a gradient structure; after the MOF gradient layer is subjected to Ar plasma pretreatment to introduce hydroxyl, the ultrathin polyamide selection layer is formed by utilizing interfacial polymerization of fluorine-containing acyl chloride and a macrocyclic amine monomer, and the ultrathin polyamide selection layer is suitable for gas separation work.

The invention discloses a preparation method of Fe3O4 magnetic nanoparticles rich in carboxyl groups on the surface, which comprises the following steps: modifying Fe3O4 nanoparticles by using polyethylene glycol and silicon dioxide to enhance the dispersity and biocompatibility of the magnetic nanoparticles, modifying the surfaces of PEG-Fe3O4 coated SiO2 nanoparticles by using a silane coupling agent containing silane groups and unsaturated double bonds to obtain the magnetic nanoparticles rich in carboxyl groups on the surface, and modifying the magnetic nanoparticles rich in carboxyl groups on the surface by using a silane coupling agent containing silane groups and unsaturated double bonds to obtain the magnetic nanoparticles rich in carboxyl groups on the surface. Then octavinyl-POSS and double bonds on the surfaces of the nano particles are subjected to click modification to form an octahedral cage, 4-mercaptobenzoic acid and double bonds are further subjected to click modification, the surfaces of the nano particles are rich in carboxyl, and a polymer brush rich in carboxyl is constructed. Compared with a conventional streptavidin coupling method, a high-density polymer chain provides a large number of carboxyl active binding sites, so that the streptavidin coupling amount is increased, the antibody coupling rate is increased, and a solution is provided for applications such as high-sensitivity biological detection, efficient targeted drug delivery and stable immunoassay.

The invention provides an immunomagnetic bead, a preparation method and a detection reagent. The preparation method comprises the following steps: preparing a modified magnetic bead containing a dibenzocyclooctyne group; protein and a coupling agent containing azide groups are sequentially dissolved in a second coupling buffer solution to react, modified protein containing azide groups is obtained, the final concentration of the reacted protein is 0.5-5 mg / mL, and the final concentration of the coupling agent is 0.05-5 mM; and mixing the modified magnetic beads and the modified protein according to an addition ratio of 1mg: (1-40) nmol, and reacting to obtain the immunomagnetic beads. According to the present invention, the immunomagnetic bead preparation method has advantages of high coupling efficiency, small inter-batch difference, strong specificity and difficult aggregation during the preparation process, such that the accurate detection of the antigen concentration is achieved so as to solve the defects of low coupling efficiency, large inter-batch difference and easy aggregation existing in the immunomagnetic bead preparation method in the related technology.

The invention discloses modified egg shell powder with a high-activity porous structure and a preparation method of the modified egg shell powder. The material is prepared by the following steps: cleaning egg shells, calcining for 15-40 minutes in an air atmosphere of 300-400 DEG C, grinding and grading, and carrying out surface modification by a silane coupling agent containing amino groups and / or epoxy groups. The BET specific surface area of the modified egg shell powder is larger than 5 m / g, and the surface water contact angle is larger than 90 degrees. Comparison experiments prove that the eggshell powder treated by the method disclosed by the invention has obviously improved surface reaction activity, a porous structure and fundamentally improved interface bonding force with a polymer matrix. The material can be used as a functional filler in the field of composite materials.

The invention provides a novel silane coupling agent and a preparation method thereof, and belongs to the technical field of silane coupling agents, and the preparation method comprises the following steps: taking chloropropyltriethoxysilane and 2, 2-(1, 2-ethanedioxy) diethyl mercaptan as raw materials, adding a catalyst and an acid-binding agent, mixing, and heating for reaction to obtain the novel silane coupling agent. The invention provides a novel silane coupling agent and a preparation method thereof. The purposes of facilitating industrial production and obtaining high-purity and high-yield products are achieved.

The invention discloses a low-odor regenerated polypropylene composite material as well as a preparation method and application thereof, and belongs to the technical field of polymer composite materials. Comprising the following raw materials in parts by mass: 10-78 parts of polypropylene, 10-50 parts of regenerated polypropylene, 0-20 parts of an inorganic filler, 2-15 parts of a toughening agent, 0.5-2 parts of an isocyanate coupling agent, 1-3 parts of an odor adsorbent, 0.1-0.5 part of an initiator and 0.5-2 parts of a processing aid. By adding an isocyanate coupling agent, in the extrusion granulation process, an isocyanate group (-NCO) and hydroxyl (-OH) or amino (-NH2) or carboxyl (-COOH)-containing micromolecules remaining in regenerated polypropylene or generated in the extrusion process are subjected to an addition reaction to form urea bonds or urethane bonds, and a plurality of micromolecules are cross-linked to form a macromolecular network; the small molecules with odor are captured, so that the content of emitted substances is reduced; in addition, small molecules are further adsorbed by cooperatively utilizing an odor adsorbent, and the low-emission regenerated polypropylene composite material is prepared.

The invention discloses a microbial soil conditioner and a preparation method thereof, and relates to the technical field of soil improvement. The method comprises the following steps: culturing heavy metal-resistant chlorella and aspergillus niger to obtain a mixed bacterial suspension, combining the mixed bacterial suspension with a composite chelating modifier prepared by reacting chitosan quaternary ammonium salt, ethylenediamine tetraacetic acid and epichlorohydrin, carrying out crosslinking by using genipin to obtain a functional microbial agent, and carrying out pyrolysis and acid oxidation on corn straws as a raw material to obtain the heavy metal-resistant chlorella modified functional microbial agent. The preparation method comprises the following steps: preparing a nano zero-valent iron-biochar composite material, reducing and loading ferrous ions through sodium borohydride, preparing the nano zero-valent iron-biochar composite material, mixing the nano zero-valent iron-biochar composite material with zeolite, bentonite and a silane coupling agent, carrying out spray drying to prepare a porous carrier substance, and finally stirring and mixing an organic fertilizer complex microbial inoculant, the functional microbial inoculant and the carrier substance, and aging to prepare the soil conditioner. The prepared conditioner has a good remediation effect on soil heavy metal pollution.

The invention relates to the technical field of copper smelting, in particular to an MOF composite membrane capable of selectively adsorbing rhenium and a preparation method and application of the MOF composite membrane. The preparation method of the MOF composite membrane capable of selectively adsorbing rhenium, provided by the invention, comprises the following steps: dispersing a sulfonic acid functionalized UiO-66 type metal organic framework material in a polyvinylidene fluoride solution to obtain a metal organic framework material dispersion liquid; mixing the metal organic framework material dispersion liquid with a cross-linking agent, carrying out a cross-linking reaction, and then mixing the obtained reaction liquid with an acid-resistant ionic liquid to obtain a spinning solution; performing electrostatic spinning on the spinning solution to obtain a silk membrane; and dipping the silk membrane in an amino silane coupling agent solution, and curing to obtain the MOF composite membrane capable of selectively adsorbing rhenium. The MOF composite membrane capable of selectively adsorbing rhenium provided by the invention can selectively adsorb rhenium in waste acid treatment, so that selective separation of rhenium is realized, and meanwhile, the membrane has excellent acid tolerance.

The invention relates to the technical field of antistatic materials, and relates to an antistatic styrene copolymer for producing a carrier tape and a preparation method thereof, and the antistatic styrene copolymer comprises the following components by mass: 45%-60% of HIPS, 6%-10% of HIPS / PPO alloy, 15%-25% of conductive carbon black, 5%-15% of a compatilizer, 6%-15% of a flexibilizer, 2%-5% of a carbon black dispersant, 0.3%-0.8% of an antioxidant, and 0.5%-1% of a lubricant. The carbon black dispersing agent comprises a coupling agent and medium-chain and long-chain aliphatic tertiary amine. Through the collaborative design of the tertiary amine-coupling agent binary carbon black dispersing agent and the HIPS / PPO heat-resistant alloy, the styrene system filled with 15%-25% high carbon black has no crystal point, no carbon deposit, no melting in 225 DEG C heat sealing and no black falling in tape tearing, and the industrial-grade requirement of continuous high-speed production of carrier tapes is met.

The invention belongs to the technical field of silicone sealants, and particularly discloses a transparent silicone sealant and a preparation method thereof. The transparent silicone sealant is prepared from the following raw materials in parts by weight: 100 parts of hydroxyl-terminated polydimethylsiloxane; 8-12 parts of a diluent; 6-10 parts of a filler; 6-10 parts of a cross-linking agent; 1-3 parts of a self-made coupling agent; 0.1 to 0.3 part of a catalyst; wherein the self-made coupling agent is prepared by compounding gamma-aminopropyl trimethoxy silane and an amino silane oligomer, and the self-made coupling agent is prepared by compounding the gamma-aminopropyl trimethoxy silane and the amino silane oligomer; the mass ratio of the gamma-aminopropyl trimethoxy silane to the amino silane oligomer is (1: 1)-(1: 4). According to the invention, the modulus, heat resistance and wet adhesive force of a finally cured coating can be obviously improved, and the coating has very strong storage stability, is not easy to generate performance change in a storage process, and is beneficial to actual production control and long-term storage.

This invention discloses a potassium nepheline precursor and its dispersion, a potassium nepheline catalyst, its preparation method, and its applications. The potassium nepheline precursor of this invention has an amino-containing silane coupling agent grafted onto its surface. The potassium nepheline precursor dispersion of this invention comprises a potassium nepheline precursor and a dispersion medium, wherein the average diameter of the potassium nepheline precursor in the dispersion is 5–20 nm. The potassium nepheline catalyst prepared using the potassium nepheline precursor dispersion of this invention exhibits high activity and good stability when used in transesterification reactions to produce biodiesel.

The invention relates to a preparation method of a hydrolysis modified organic silicon high-temperature-resistant anticorrosive coating, and belongs to the technical field of anticorrosive coatings. The preparation method comprises the following steps: heating 1, 1 '-bis (dimethylsilyl) ferrocene, methylbenzene, chloroplatinic acid, 2, 2, 3, 3, 4, 4, 4-heptafluorobutyl acrylate and bis-(2-methylallyl) cyclooctyl-1, 5-diene ruthenium, and reacting to obtain an intermediate product 1; weighing methyltrimethoxysilane, phenyltrimethoxysilane and the intermediate product 1, uniformly stirring and mixing, slowly dropwise adding diluted hydrochloric acid, hydrolyzing, and heating to react, so as to obtain modified silicon resin; adding the modified silicon resin into petroleum ether, and adding silicone oil, an organic tin catalyst, a bis-ammonia coupling agent, filler and a curing agent to obtain the anticorrosive paint.

The invention provides a polysiloxane aerogel composite material and a preparation method thereof, and belongs to the technical field of aerogel. Polysiloxane is modified through a silane coupling agent containing sulfydryl and then subjected to a click chemical reaction with vinyl POSS, after hydrolysis and drying, amino-modified aerogel is prepared through modification with a silane coupling agent with amino, the amino-modified aerogel reacts with polyimide fibers containing acyl chloride side chains and ketone groups, and the polysiloxane aerogel composite material is prepared. The polysiloxane aerogel composite material prepared by the invention has uniform pore density, high mechanical strength and better hydrophobicity, can realize self-repairing by heating, remarkably reduces maintenance and replacement costs, and has wide application prospects.

The invention relates to an amino silane coupling agent modified halloysite nanotube mercury-free catalyst for acetylene hydrochlorination reaction. The catalyst comprises a carrier and an active component. The carrier is a halloysite nanotube modified by one or more amino silane coupling agents. The active component is one or a combination of more of halides and complexes of precious metals such as gold, silver, rhodium, palladium, platinum and ruthenium, and the mass ratio of the single active component to the carrier is 0.01-1%. The preparation method of the catalyst adopts a preparation method combining a reflux method and an ultrasonic / microwave-assisted impregnation method, and comprises the following two steps: 1) grafting an amino silane coupling agent by adopting the reflux method to modify halloysite nanotubes; and 2) loading an active component on the halloysite nanotube obtained in the step 1) by using an ultrasonic / microwave-assisted impregnation method.The catalyst prepared in the invention shows good catalytic performance in an acetylene hydrochlorination reaction process, the acetylene conversion rate reaches 97.34%, and the vinyl chloride selectivity reaches up to 99.68%.

The invention provides a preparation method of a shrinkage-resistant supercritical TPU foaming material, and relates to the technical field of foaming materials, and the preparation method comprises the following steps: selecting an unactivated inorganic filler, and activating the inorganic filler by using a coupling agent containing amino or hydroxyl; uniformly dispersing the activated powder into a TPU base material through a pre-dispersion-dispersion process, and extruding into a plate through an extruder; placing the extruded TPU plate in a two-way stretching instrument, setting the temperature to be higher than the Vicat softening point and lower than the melting point of the TPU, and enabling the material to deform in the transverse direction and the longitudinal direction through two-way stretching; by introducing the filler with groups such as amino or hydroxyl, the filler and TPU can generate hydrogen-bond interaction, so that the dimensional stability of the material is improved; by adding the inorganic filler, the effect of heterogeneous nucleation points is achieved in the supercritical foaming process, and by means of two-way stretching and molecular chain orientation, the strength of the material in the length-width direction is improved, and the post-curing speed is increased.

A rhamnolipid ester is useful as a cosmetic additive. A method of its production involves providing at least one rhamnolipid, reacting the at least one rhamnolipid with at least one coupling reagent, reacting the at least one rhamnolipid with a polyhydric alcohol having 1 to 32 carbon atoms, and optionally purifying the at least one rhamnolipid ester.

The application provides a silicone sealant not prone to discoloration and a preparation method thereof, and relates to the technical field of silicone sealants. The silicone sealant comprises the following components in parts by weight: 100 parts of hydroxyl-terminated polydimethylsiloxane, 70-130 parts of fillers, 0-20 parts of dimethyl silicone oil, 5-12 parts of a crosslinking agent, 1-3 parts of a coupling agent oligomer, 0.5-3 parts of an epoxy coupling agent and 0.01-0.5 parts of a catalyst. The application adopts a customized amino coupling agent oligomer with a specific structure, and optimizes the formula to achieve optimal effects by matching 107 glue, fillers and the like at a proper ratio. The application can improve the poor high-temperature tensile bonding property and the discoloration under high temperature of the existing silicone sealant, realizes good high-temperature bonding property and is not prone to discoloration, and in particular, the discoloration phenomenon under high-temperature application scenarios is obviously improved, thereby meeting the high requirements in special building, automobile, electronic and electrical applications and the like.

This invention discloses a transparent silica aerogel, an aerogel film, its preparation method, and its applications. The transparent silica aerogel comprises the following components: silica aerogel powder, an alcohol-based organosilicon-modified nanoresin sol, and a silane coupling agent; the silane coupling agent is selected from (3-aminopropyl)triethoxysilane, or a combination of (3-aminopropyl)triethoxysilane and long-chain alkylsilane coupling agents; the silica aerogel powder has a particle size of 5.8-6.2 nm. This invention achieves a breakthrough in the comprehensive performance of transparent silica aerogel, including high transparency, strong adhesion, and tunable hydrophobicity, by compounding silica aerogel powder, alcohol-based organosilicon-modified nanoresin sol, and a specific silane coupling agent.

This application relates to the field of polymer materials technology, providing a PET elastomer, composite material, dynamic covalent network polymer, and its preparation method and application. The elastomer is prepared by in-situ self-assembly of crown ether-primary amide dual-functionalized PET through melt blending. Its molecular network integrates a quasi-rotaxane supramolecular crosslinking network. This structure is formed by the host-guest interaction between the crown ether and the primary amide, and can act as a sliding crosslinking point to dissipate energy through the sliding of cyclic components. This application employs a two-step end-capping-in-situ self-assembly process to overcome the technical obstacles of low PET chain-end activity and poor compatibility between polyrotaxane and PET, achieving molecular-level dispersion of quasi-rotaxane in the PET matrix. This fully utilizes the molecular pulley effect to achieve breakthrough toughening of the elastomer. Simultaneously, it combines rigid nanofillers modified with aminosilane coupling agents to form a soft-hard synergistic network, enabling the PET composite material to maintain high toughness while simultaneously improving strength, modulus, and thermal properties.

According to the morus laevigata-like composite filler and the modified fluororubber, the morus laevigata-like composite filler is successfully prepared through an in-situ polymerization method, and the influence of the morus laevigata-like composite filler on the performance of the fluororubber is systematically researched. In the core-shell structure of the mulberries-like composite filler, nano SiO2 particles are tightly combined on the surfaces of the carbon nanotubes in a disordered cluster shape to form a high-roughness interface structure. The amino group of the amino silane coupling agent is chemically grafted with the hydroxyl group on the surface of SiO2 through Si-O-Si bonding, and meanwhile, the exposed amino group and the FKM matrix form hydrogen bond interaction, so that the interfacial compatibility is remarkably optimized. The mulberries-like composite filler provides an innovative solution for sealing and vibration reduction application of high-performance fluororubber in a severe environment through multi-scale interface design and a chemical-physical synergistic enhancement mechanism.

The invention discloses a preparation method and application of a coupling agent modified sludge-based magnetic carbon material, and the method comprises the following operation steps: (1) pyrolyzing a Fenton sludge raw material in a nitrogen protective atmosphere to obtain sludge-based magnetic charcoal; (2) placing the sludge-based magnetic biochar in a sodium hydroxide solution for oxidation hydroxylation, filtering, and drying to obtain oxidized magnetic biochar; and (3) preparing a 3-aminopropyltriethoxysilane (APTES) solution with the concentration of 0.1 g / L, dispersing the oxidized magnetic biochar obtained in the step (2) in the APTES solution according to the solid-to-liquid ratio of 1: 100 (g: mL), reacting for 24 hours at the temperature of 50 DEG C under the acidic condition, filtering and drying to obtain the coupling agent modified sludge-based magnetic carbon material. According to the method, the Fenton sludge solid waste is used as a carbon material precursor, meanwhile, an endogenous iron element is provided, synchronous carbonization and magnetization are achieved through pyrolysis, and therefore the micro-plastics in the water body can be efficiently removed.

The application relates to a salt-resistant oil displacement system for alkali-free binary compound flooding and a preparation method and application thereof, and belongs to the technical field of oil production. The oil displacement system is composed of the following components: 0.1-0.5 wt% of amino silane coupling agent modified xanthan gum, 0.1-0.5 wt% of a surfactant, 0.05-0.2 wt% of a high-temperature stabilizer, 0.05-0.1 wt% of chitosan quaternary ammonium salt, 0.05-0.1 wt% of silane coupling agent modified nano silicon dioxide, and the balance of water; the high-temperature stabilizer is one or more of polyvinyl alcohol, polyethylene glycol and polypropylene glycol. The oil displacement system provided by the application is compounded by taking xanthan gum as a core compound and a surfactant, is an oil displacement system for alkali-free binary compound flooding, utilizes the high-salt resistance of xanthan gum, and improves the defects of poor water solubility, easy decomposition at high temperature and easy degradation by bacteria, and has obvious improvement in profile control performance and can be used in a high-salt high-temperature environment.

The embodiment of the invention provides a water plugging and grouting material as well as a preparation method and application thereof. The water shutoff grouting material comprises modified nano particles and polyurethane, the modified nano particles are formed by condensation reaction of nano particles and a silane coupling agent with amino groups, the modified nano particles and the polyurethane are bridged through the amino groups, and the nano particles comprise graphene oxide and silicon dioxide. The water plugging and grouting material disclosed by the invention has relatively good mechanical strength, impermeability and durability.

The application discloses double-layer coated mica powder and a preparation method thereof. The double-layer coated mica powder has a core-shell structure, and sequentially comprises a mica powder core, an amino acid coating layer and a coupling agent coating layer from inside to outside. The preparation method comprises the following steps: S1. uniformly stirring mica powder, adding inorganic coating agent, and uniformly mixing the inorganic coating agent with the mica powder to obtain mica powder containing hydroxyl groups; S2. calcining the mica powder containing hydroxyl groups in an air atmosphere to obtain powder A; S3. adding amino acid surfactant to the powder A, uniformly stirring and mixing to obtain mica powder coated with an amino acid layer; and S4. adding coupling agent to the mica powder coated with the amino acid layer, uniformly stirring and mixing to prepare a coupling agent coating layer, and drying to obtain double-layer coated mica powder. The double-layer coated mica powder prepared by the application not only has a low friction coefficient, but also has good hydrophobicity and good antibacterial effect.

The application relates to the field of sewage treatment, and discloses a sulfur autotrophic denitrification biofilter composite filler and a preparation method thereof. The method comprises the following steps: carrying out a silane hydrolysis reaction on a silane coupling agent containing a mercaptan group to prepare a hydrolysis solution, and then adding hydroxylated polystyrene microspheres into the hydrolysis solution to carry out a grafting reaction and prepare the sulfur autotrophic denitrification biofilter composite filler. The method grafts mercaptan groups to the surface of the polystyrene microspheres by using the silane coupling agent containing the mercaptan group. The mercaptan groups can specifically combine with sulfur transport proteins on the cell membrane of sulfur autotrophic denitrification microorganisms, so that the sulfur autotrophic denitrification microorganisms can selectively colonize on the surface of the polystyrene microspheres, competition between other microorganisms and the sulfur autotrophic microorganisms can be avoided, the colonization stability of the sulfur autotrophic microorganisms is improved, and the biofilm formation efficiency is improved.

The invention provides a preparation method of high-purity aminoglycerol, which comprises the following steps: by taking glycerol and ammonia gas as raw materials, carrying out ammoniation reaction under the action of a composite catalyst; the composite catalyst is composed of an active component, a carrier and a cocatalyst, the active component is a rare earth metal-molybdate compound, the carrier is mesoporous silica subjected to acid treatment and amino silane coupling agent modification, and the cocatalyst is a transition metal doped carbon nitride material; according to the method, efficient and high-selectivity synthesis of the aminoglycerol is realized by optimizing the composition of the catalyst and reaction conditions, and the product purity is remarkably improved.

The present application relates to the technical field of surface modification materials, and particularly relates to a perfluoroalkyl silane coupling agent for material surface modification and a preparation method thereof. The coupling agent comprises synergistically modified perfluoroalkyl triethoxysilane, an organic small-molecule functional regulator, an acid catalyst, a surfactant, a stabilizer, ethanol and deionized water. The synergistically modified perfluoroalkyl triethoxysilane is prepared by synergistic modification of perfluoroalkyl triethoxysilane, monohydroxyl column [5] arene, octakis(glycidyl ether propyl) silsesquioxane, N-(2-aminoethyl)-3-aminopropyl trimethoxysilane and 2,6-pyridine dimethyl formaldehyde through host-guest inclusion, epoxy-amine ring-opening reaction and Schiff base condensation reaction, and the organic small-molecule functional regulator is 9,10-dihydroxyanthracene. The preparation method is simple and suitable for surface modification of various substrates such as glass, metal, ceramic and polymer materials.

This invention relates to a method for the liquid-phase adsorption separation and purification of 2,3-dichloronitrobenzene and 3,4-dichloronitrobenzene, belonging to the field of chemical separation. This method for the simultaneous separation and purification of 2,3-dichloronitrobenzene and 3,4-dichloronitrobenzene involves preparing small spherical molecular sieve adsorbents from USY molecular sieves, silicon coupling agent-modified illite, and biomass polysaccharides, which are then loaded into a countercurrent simulated moving bed for separation and purification. This method can simultaneously obtain 2,3-dichloronitrobenzene and 3,4-dichloronitrobenzene with a purity ≥99%. The separation and purification method adopted in this invention is not only energy-efficient and highly effective, but also enables continuous production of two high-purity dichloronitrobenzenes, possessing significant industrial application value.