63 results about "Polychloroprenes" patented technology

The invention discloses a reaction device based on dichlorobenzonitrile synthesis and a use method thereof, and relates to the field of reaction devices.According to the technical scheme, the reaction device comprises a reaction tank and a cover located at the top end of the reaction tank, a heating interlayer is arranged on the reaction tank, and a spiral conveying pipe surrounding a reaction cavity in the middle of the reaction tank is arranged in the heating interlayer; the heating medium is conveyed through the spiral conveying pipe, and the gap between the heating interlayer and the spiral conveying pipe is filled with the heat preservation material, so that the heating medium is conveyed around the reaction cavity in the heating interlayer through the spiral conveying pipe, and the spirally distributed conveying pipe can enable the heating medium to uniformly act on the outer wall of the reaction cavity; heat loss is reduced through the heat preservation material between the heating interlayer and the spiral conveying pipe, accurate control and uniform distribution of the reaction temperature are achieved, side reactions caused by local overheating are avoided, and therefore generation of polychlorinated impurities is reduced, and the purity of the dichlorobenzonitrile product is improved.

The invention relates to the technical field of epoxy splicing adhesives, in particular to a high-performance prefabricated part epoxy splicing adhesive and a preparation method thereof.The epoxy splicing adhesive comprises a component A and a component B. The component A is prepared from 3%-8% of polyether polyol, 2%-4% of hydrophobic fumed silica, 0.1%-1% of a silane coupling agent, 0.01%-0.5% of a defoaming agent, 50%-75% of modified quartz sand, 1%-5% of color paste and the balance epoxy resin; the modified quartz sand is prepared by grafting an amino silane coupling agent on the surface of quartz sand, then reacting with polychlorophosphazene, and then reacting with glycidol; the component B comprises the following components in percentage by weight: 0.2-4% of color paste, 1-5% of hydrophobic fumed silica, 0.1-1% of an amino silane coupling agent, 10-25% of 0.5 mm quartz sand, 40-60% of 0.1 mm quartz sand and the balance of a modified amine curing agent; the preparation method has the advantage that the mechanical strength and the bonding strength of the epoxy splicing adhesive are improved.

The invention discloses a catalytic combustion catalyst for treating CVOCs (Chemical Volatile Organic Compounds) as well as a preparation method and application of the catalytic combustion catalyst. The preparation method comprises the following steps: (1) impregnating and loading cerous nitrate and trimethyl phosphate on a carrier, drying, and roasting at 600-800 DEG C to form a modified carrier containing a cerous phosphate crystal phase; and (2) impregnating and loading active metal ruthenium on the modified carrier, drying and roasting to obtain the catalyst for treating catalytic combustion of the CVOCs. The catalyst provided by the invention can be used for catalytic combustion degradation of CVOCs such as dichloromethane, chlorobenzene, chloroethylene, dichloroethane, dichloroethylene, oxychloropropane and the like. For catalytic combustion degradation of CVOCs, the catalyst disclosed by the invention can show high activity, high chlorine-resistant stability, low polychlorinated by-product selectivity and thermal stability, and has certain industrial application prospects.

An elastomeric article is formed from a blend of nitrile rubber and polychloroprene rubber. The elastomeric article can be a glove, such as a medical exam glove. The elastomeric article is softer than a conventional nitrile elastomeric article. The elastomeric article is formed from a blended rubber latex emulsion of nitrile and polychloroprene. The blended rubber latex emulsion may be free of sulfur and vulcanization accelerators.

The invention discloses a preparation method and device for improving selectivity of methallyl chloride, the device adopts two sections of reactors, the first section is a main reactor, and a chlorination reaction is mainly carried out in the first section of reactor; chlorine is quantitatively introduced into the second-section reactor so as to consume residual isobutene at the front end. According to the method disclosed by the invention, the chlorination reaction is carried out by utilizing the two-stage reactor, the ratio of isobutene to chlorine is reasonably controlled, and the generation of polychlorinated by-products is inhibited, so that the main product methyl allyl chloride keeps high selectivity, meanwhile, the complete conversion of isobutene is ensured, and the problem of separation of isobutene and hydrogen chloride in tail gas is avoided. According to the process disclosed by the invention, the selectivity of the methallyl chloride reaches 90%, and the economic benefit of the device is obviously improved.

The present invention provides: a resin composition which achieves a good balance among the mechanical characteristics, decorativeness and aesthetic appearance at high levels; and a method for producing this resin composition. One embodiment of the present invention provides: a resin composition which contains cellulose nanofibers, a resin and a liquid polymer that has a thermal decomposition initiation temperature of more than 200° C.; and a method for producing this resin composition. With respect to one embodiment of the present invention, the liquid polymer contains a diene rubber. With respect to one embodiment of the present invention, the liquid polymer is composed of one or more substances that are selected from the group consisting of a polybutadiene, a butadiene-styrene copolymer, a polyisoprene and a polychloroprene.

The invention discloses a preparation method of ethyl 4-chloroacetoacetate, and belongs to the technical field of compound synthesis. The method comprises the following steps: by taking diketene as a raw material, adding a polymethylsilsesquioxane polymerization inhibitor into a dichloromethane solvent, introducing chlorine at low temperature, carrying out chlorination reaction to generate 4-chloroacetoacetic acid, then esterifying the 4-chloroacetoacetic acid with absolute ethyl alcohol to obtain a crude product, and finally distilling and purifying to obtain the product. The preparation method is characterized in that a polymethylsilsesquioxane polymerization inhibitor is added before chlorination reaction, the polymerization inhibitor is prepared by grafting a functional monomer containing a 3, 5-di-tert-butyl-4-hydroxycinnamic acid structure onto surface-ethenylated polymethylsilsesquioxane microspheres, and the polymethylsilsesquioxane polymerization inhibitor has both steric hindrance and free radical capture capability. The method can effectively inhibit the self-polymerization and copolymerization tendency of diketene, intermediates and products in a reaction system, obviously reduces the generation of by-products such as dichloro and polychloro, enables the product to be high in yield and good in purity, and meets the quality requirements of high-end medical intermediates.

The invention discloses a method for reducing chlorophenol by coupling micron-sized zero-valent iron with dechlorination microorganisms, which is characterized in that micron-sized zero-valent iron is added into a system for reducing chlorophenol by dechlorination microorganisms to synergistically degrade chlorophenol compounds, and the particle size of the micron-sized zero-valent iron is greater than or equal to 1 mu m. According to the method disclosed by the invention, by constructing the reduction system of the micron-sized zero-valent iron coupled dechlorination microorganisms, the chlorophenol compounds can be efficiently reduced by utilizing the synergistic promotion effect of the micron-sized zero-valent iron coupled dechlorination microorganisms, so that not only can the efficient removal of polychlorophenols be realized, but also the proportion of low-toxicity products in the reduction system can be remarkably increased; the method has the advantages of simple process, convenience in operation, low cost, high treatment efficiency, high proportion of low-toxicity chlorophenol in a reduction product, environmental friendliness and the like, is suitable for degrading chlorophenol compounds in wastewater, and has high use value, good application prospect and wide application prospect. The method is of great significance in effectively reducing the overall toxicity of the chlorophenol pollutants and effectively reducing the harm of the chlorophenol pollutants to the environment and human beings.

The invention discloses a preparation method of p-chlorobenzotrifluoride, and belongs to the technical field of fluorine-containing carbocyclic compounds, the preparation method comprises the following steps: preparation of carbazolyl copolymer microspheres, chlorination reaction, fluorination reaction and rectification; according to the invention, a four-tower series continuous chlorination reaction system is adopted, each reaction tower independently controls the ultraviolet light power and temperature, and the chlorination reaction is intensified in a segmented manner, so that high-efficiency reaction in the front, middle and later stages is realized; the first tower is mainly used for monochlorination, the second tower is used for deepening dichlorination, the third tower and the fourth tower are used for realizing efficient conversion of polychlorinated products, the reaction time is shortened, the generation of side reaction impurities is reduced, the energy consumption is reduced, the yield and purity of target products are improved, the temperature rise in the reaction process is easier to control, and the safety of the reaction process is further improved. The purity of the parachlorobenzotrifluoride prepared by the method disclosed by the invention is 99.61 to 99.72 percent, and the two-step yield of the parachlorobenzotrifluoride is 96.48 to 96.65 percent.

A highly unsaturated fatty acid or a highly unsaturated fatty acid ethyl ester that has been produced using as a feedstock oil a fat or oil that contains highly unsaturated fatty acids as constituent fatty acids and which has been reduced in the contents of environmental pollutants, wherein among the dioxins contained, polychlorinated dibenzoparadioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are contained in amounts of less than 0.05 pg-TEQ / g and coplanar PCBs (Co-PCBs) in amounts of less than 0.03 pg-TEQ / g. Also disclosed is a method for producing the highly unsaturated fatty acid or highly unsaturated fatty acid ethyl ester by the steps of removing free fatty acids and environmental pollutants by thin-film distillation from a feedstock oil, ethyl esterifying the resulting fat or oil, and refining the same by rectification and column chromatography.

The invention discloses a method for simultaneously detecting polychloroprene and polychlorobenzene in a biological sample, which comprises the following steps: extracting the biological sample through ultrasonic extraction, replacing the existing rotary evaporation concentration with rapid evaporation concentration, and combining dynamic multi-reaction monitoring of a gas chromatograph-triple quadrupole mass spectrometer to detect the polychloroprene and polychlorobenzene in the biological sample. Synchronous extraction, impurity removal, purification and quantitative and qualitative analysis of 9 polychlorobutadiene and 11 polychlorobenzene in a biological sample can be realized, and the detection efficiency is improved.

The invention discloses a polychlorinated polymer / graphene oxide composite membrane for ammonia separation and a preparation method thereof, and the preparation method comprises the following steps: S1, dissolving graphene oxide in a solvent I, and depositing on a porous polymer substrate through a vacuum filtration device to obtain a graphene oxide composite membrane; s2, dissolving a nitrogen heterocyclic compound containing a carbon-carbon double bond, a cross-linking agent and an initiator in a solvent II, spin-coating on the graphene oxide composite film, and then heating for 2-8 hours to obtain a polymer / graphene oxide composite film; s3, soaking the polymer / graphene oxide composite membrane in a halogenated hydrocarbon solution to obtain a quaternized polymer / graphene oxide composite membrane; and S4, soaking the quaternized graphene oxide polymer composite membrane in a metal chloride solution to obtain the polychlorinated polymer / graphene oxide composite membrane. The obtained composite membrane has an efficient ammonia separation effect, and when the composite membrane is used for separating ammonia-containing gas, the ammonia permeability reaches up to 3586.3 Barrer, and the ammonia / nitrogen selectivity and the ammonia / hydrogen selectivity respectively reach up to 674.1 and 214.8.

The application belongs to the technical field of catalysts, and relates to a catalyst and a preparation method and application thereof. Specifically, the catalyst is a phosphorus-doped cobalt-rhodium composite oxide catalyst, and the preparation method is that different atomic ratios of Rh and P are doped in Co3O4 by using a coprecipitation method and a hydrothermal method. The method for preparing 2,3-dichloropyridine by using the catalyst has simple process and mild reaction conditions, can effectively control excessive dechlorination of polychloropyridine, reduce generation of by-products, the conversion rate of raw materials can reach 98%, the selectivity of the target product 2,3-dichloropyridine reaches 95%, and the mild reaction conditions have low requirements on equipment and small demand on energy, and are suitable for industrialized production.

The invention discloses a method for treating polychlorinated nitrobenzene-containing wastewater by adopting calcium hydroxide alkaline hydrolysis. The method comprises the following steps: firstly, adding calcium hydroxide into wastewater containing polychlorinated nitrobenzene, carrying out hydrolysis reaction under stirring and temperature control conditions, carrying out nucleophilic substitution on activated chlorine substitution sites and nitro substitution sites in polychlorinated nitrobenzene molecules by utilizing hydroxyl ions to generate phenolic substances such as trinitrodichlorophenol and the like, and separating the phenolic substances to obtain the polychlorinated nitrobenzene-containing wastewater. Performing ultrasonic treatment on the first treatment liquid until the solution turns yellow and the chromaticity is not increased any more to obtain a first treatment liquid, and performing ultrasonic treatment, washing and filtering on the first treatment liquid to remove precipitated solids to obtain the treatment liquid. According to the method disclosed by the invention, the primary attenuation of the polychlorinated nitrobenzene-containing wastewater is realized, and the treatability of the wastewater is improved.

The invention relates to the technical field of synthesis of 6-chloro-2-nitrotoluene, and particularly discloses a method for preparing 6-chloro-2-nitrotoluene by step-by-step chlorination, which comprises the following steps: connecting three chlorination kettles in series, and respectively marking by using a 1 # kettle, a 2 # kettle and a 3 # kettle; the method comprises the following steps: adding o-nitrotoluene and 1.5%-2.0% of anhydrous ferric chloride into a 1 # kettle, heating to 55-60 DEG C, introducing chlorine for reaction, and closing the chlorine when the density of the 1 # kettle is 1.207-1.213 g / cm < 3 >; transferring the material in the 1 # kettle to a 2 # kettle through a bottom material transferring pipe, and simultaneously adding o-nitrotoluene and 1.5%-2.0% of anhydrous ferric chloride into the 1 # kettle again; different catalysts are sequentially added in different stages of the o-nitrotoluene chlorination reaction, the temperature of each reaction kettle and the amount of the catalyst are adjusted, the reaction rates of the three kettles are balanced, the catalyst cost is low, the reaction conversion rate is high, the selectivity of 6-chloro-2-nitrotoluene is effectively improved, and the generation of polychlorides is reduced; the chlorine reaction rate is greatly improved, and the tail gas treatment cost and the raw material cost are reduced.

The invention provides a method for catalytically degrading polyolefin plastic by using a eutectic solvent, which comprises the following steps: placing polyolefin plastic particles, C4-C6 alkane, an amide-AlCl3 eutectic solvent, an initiator and polychloromethane in a reactor, and carrying out catalytic degradation reaction in an anhydrous and closed environment to obtain a hydrocarbon product; wherein the C4-C6 alkane is added before the polyolefin plastic particles and the amide-AlCl3 eutectic solvent coexist in the reactor; the amide-AlCl3 deep eutectic solvent is prepared from an amide compound and AlCl3; the amide compound is selected from one or more of chloroacetamide, formamide, acetamide, N-methylformamide, N-methylacetamide, N, N-dimethylacetamide, N, N-diethyl acetamide and N, N-dimethylformamide, and the amide compound is selected from one or more of chloroacetamide, formamide, acetamide, N-methylformamide, N-methylacetamide, N, N-dimethylacetamide, N, N-diethyl acetamide and N, N-dimethylformamide; the eutectic solvent is applied to catalytic degradation of polyolefin plastic for the first time, and the problems that a traditional method is low in efficiency and high in cost at low temperature are solved.

Biodegradable, controlled release microcapsules whose microcapsule walls comprise the reaction product of fractured plant proteins with isocyanates and / or bis- or poly-chloroformates.

The invention relates to the technical field of medicine synthesis, and particularly discloses a preparation method of a cefdil intermediate. According to the invention, trichloroisocyanuric acid (TCCA) is taken as a green chlorination reagent, and reaction solvent and temperature are selected, so that the problem that benzene ring polychlorination side reaction and aldehyde functional group nucleophilic substitution side reaction are effectively inhibited while ortho-position high-selectivity mono-chlorination of phenolic hydroxyl is realized is successfully solved; and thus, the 2-chloro-3-hydroxy-4-methoxybenzaldehyde can be obtained at a high yield. On the basis, according to the scheme, subsequent anhydridation and amidation steps are further optimized, trimethylacetyl chloride is adopted to replace a traditional highly toxic activating reagent, safety and atom economy are improved, and meanwhile continuity and high efficiency of the reaction are ensured. The whole process route is reasonable in design, simple and convenient to operate and high in safety, raw materials and reagents are easy to obtain, the total yield of the reaction and the purity of the product are remarkably improved, and the method shows a wide application prospect in large-scale industrial production of the ceftidil.

A highly unsaturated fatty acid or a highly unsaturated fatty acid ethyl ester that has been produced using as a feedstock oil a fat or oil that contains highly unsaturated fatty acids as constituent fatty acids and which has been reduced in the contents of environmental pollutants, wherein among the dioxins contained, polychlorinated dibenzoparadioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are contained in amounts of less than 0.05 pg-TEQ / g and coplanar PCBs (Co-PCBs) in amounts of less than 0.03 pg-TEQ / g. Also disclosed is a method for producing the highly unsaturated fatty acid or highly unsaturated fatty acid ethyl ester by the steps of removing free fatty acids and environmental pollutants by thin-film distillation from a feedstock oil, ethyl esterifying the resulting fat or oil, and refining the same by rectification and column chromatography.

To provide a pharmaceutical filled with a tablet containing (A) a colorant and (B) a fragrance, and having resistance to discoloration.SOLUTION: A pharmaceutical comprises a tablet and a press-through pack sheet filled with the tablet, wherein the tablet contains (A) a colorant and (B) a fragrance, and the press-through pack sheet comprises a molded sheet containing polychlorotrifluoroethylene and an aluminum foil.SELECTED DRAWING: Figure 2

The invention relates to the technical field of catalysts and particularly discloses a catalyst for synthesizing 2, 3-dichloropyridine as well as a preparation method and application of the catalyst. The catalyst for synthesizing 2, 3-dichloropyridine provided by the invention comprises a carrier, an active component and an auxiliary agent which are loaded on the carrier, and a coating layer which coats the outside of the carrier, the carrier is a SiO2 (silicon dioxide) modified Al2O3 carrier or a TiO2 (titanium dioxide) modified Al2O3 carrier; in the TiO2 modified alpha-Al2O3 or the SiO2 modified alpha-Al2O3, the mass fraction of the TiO2 or the SiO2 is 0.5 to 5 percent; the active component is Pd; the auxiliary agent is selected from one or more of compounds of Mg, Ni, Rh and Ru; the invention further provides a preparation method of the catalyst for synthesizing the 2, 3-dichloropyridine. The catalyst for synthesizing the 2, 3-dichloropyridine, provided by the invention, can be used for synthesizing the 2, 3-dichloropyridine by hydrodechlorination of polychloropyridine, so that the reaction conversion rate and the yield of the 2, 3-dichloropyridine are greatly improved.

Provided herein are nanopore devices including a barrier using a diblock or triblock copolymer, and methods for making the same. In some embodiments, a barrier between a first fluid and a second fluid is suspended by a barrier support that defines an opening. The barrier is suspended across the opening and may include one or more layers including molecules of a block copolymer. Each molecule of the block copolymer may include one or more hydrophilic blocks having approximately a length A and one or more hydrophobic blocks having approximately a length B. The hydrophilic blocks may form an outer surface of the barrier, and the hydrophobic blocks may be located within the barrier. The hydrophobic blocks may include a polymer selected from the group consisting of poly(dimethylsiloxane) (PDMS), polybutadiene (PBd), polyisoprene, polymyrcene, polychloroprene, hydrogenated polydienes, fluorinated polyethylene, polypeptides, and poly(isobutylene) (PIB).

The invention belongs to the technical field of catalytic oxidation of VOCs (Volatile Organic Compounds), and particularly relates to a method for low-temperature catalytic combustion of chlorinated hydrocarbon by an electrostatic field in cooperation with a tungsten-cerium catalyst. According to the method, the electrostatic field in a non-Faraday mode and the tungsten-cerium catalyst (W / CeO2) are innovatively combined, the catalytic combustion conversion rate of chlorinated hydrocarbon (such as dichloroethane) is remarkably increased and the conversion temperature is reduced through the synergistic effect of the electrostatic field and the tungsten-cerium catalyst, 90% degradation can be achieved at the temperature of 200 DEG C or below, COx selectivity is high, generation of polychlorinated by-products is avoided, and the chlorine poisoning phenomenon is avoided. In addition, under the condition of an electric field, introduction of 1-5 vol% of water vapor can promote the conversion activity of DCE. The invention provides a novel method for efficient and low-temperature catalytic combustion of DCE, and the method has a good application prospect.

The application provides a method for catalytic degradation of polyolefin plastic by using a eutectic solvent, comprising the following steps: placing polyolefin plastic particles, C4-C6 alkane, amide-AlCl3 eutectic solvent, initiator and polychloromethane in a reactor to perform a catalytic degradation reaction in a water-free and sealed environment to obtain a hydrocarbon product; wherein the C4-C6 alkane is added before the polyolefin plastic particles and the amide-AlCl3 eutectic solvent coexist in the reactor; the amide-AlCl3 eutectic solvent comprises an amide compound and AlCl3; the amide compound is selected from one or more of chloroacetamide, formamide, acetamide, N-methyl formamide, N-methyl acetamide, N,N-dimethyl acetamide, N,N-diethyl acetamide and N,N-dimethyl formamide; the application first applies the eutectic solvent to the catalytic degradation of the polyolefin plastic, and solves the problems of low efficiency and high cost of the traditional method at low temperature.

The invention provides a polychlorinated spirolactonization reaction method of a phenolic compound. The polychlorinated spirolactonization reaction method is used for preparing a spirolactone compound. According to the method, 2-(3 '-hydroxyphenyl) benzoic acid and derivatives thereof are used as raw materials, trichloroisocyanuric acid is used as an oxidizing agent and a chlorine source, and the dearomatization polychlorinated spirolactonization reaction of phenolic compounds is realized through one-step operation. The key of the reaction lies in participation of halide, rapid construction of a plurality of C-Cl bonds is promoted, and spirolactone rings are formed through oxygen atom migration. The method is mild in reaction condition, simple and convenient to operate, wide in substrate application range, high in yield and selectivity, safe in preparation, low in cost, suitable for industrial production and capable of meeting the requirements of the market for wide range and large quantity.

The invention discloses a method for reducing and solidifying chlorine escape in household garbage derived fuel, which comprises the following steps: S1, screening to remove inorganic matters in household garbage, drying, and controlling the water content of the household garbage to be 2-25%; and S2, the dried household garbage is smashed, and the smashed particle size of the household garbage is controlled to range from 0.1 mm to 0.8 mm. And S3, adding a chlorine fixing agent into the crushed household garbage, and uniformly stirring and mixing. And S4, the household garbage and the chlorine fixing agent which are stirred and mixed uniformly are pressed, and the garbage derived fuel is obtained. The chlorine-containing harmful waste generated during combustion of the household garbage derived fuel is controlled by controlling the water content and adding the chlorine fixing agent. A gas-phase reaction path for generating polychlorinated dibenzo-p-dioxin and similar substances and precursors thereof from chlorine sources and organic components in the garbage in a high-temperature environment is inhibited, the chlorine sources in low-temperature flue gas are reduced, and the fixation of chlorine in the garbage derived fuel is realized.

The application provides 4-chlorophthalic acid and a preparation method and application thereof, and belongs to the field of organic synthesis. The application provides a preparation method of 4-chlorophthalic acid, which comprises the following steps: under closed conditions, phthalic anhydride (benzene anhydride), 2-benzyloxy ethanol (benzyl cellulose solvent), trimethylpentane, chlorine and water are mixed to perform chlorination reaction, and the 4-chlorophthalic acid is obtained. In the application, the benzene anhydride is dissolved in water, and the 4-chlorophthalic acid generated in the reaction process has large solubility in the mixed solvent, so that the 4-chlorophthalic acid generated in the water reaction can be timely transferred to the mixed solvent, so that the 4-chlorophthalic acid is avoided from being substituted by chlorine again to generate polychlorinated products, the generation of byproduct is reduced, the problems of high cost and low product yield in the traditional process are solved, and the application lays a foundation for opening the polyimide market for enterprises.

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

The invention belongs to the technical field of environmental analytical chemistry and detection, discloses a soil and water polychlorinated naphthalene environment rapid detection method, and aims to solve the problems that an existing polychlorinated naphthalene detection method is complex in sample pretreatment, long in detection period and high in cost, and a rapid detection technology is insufficient in sensitivity, weak in anti-interference capability and the like. The method comprises the following steps: constructing a free radical chain reaction kinetics system consisting of a chain initiator, a signal report molecule, a chain transfer and regeneration bifunctional reagent and a pH buffer system, taking polychlorinated naphthalene as a chain terminator, and determining the fluorescence quenching rate change of the signal report molecule after the polychlorinated naphthalene is introduced by measuring the fluorescence quenching rate change of the signal report molecule. The ultrasensitive quantitative detection of polychlorinated naphthalene in soil and water is realized. By adopting the technical scheme, the method has the advantages of high sensitivity and signal amplification effect, no need of complex sample pretreatment, environment friendliness, quick response, excellent anti-interference performance and the like.

The invention provides a preparation system and a preparation method of polychloromethylpyridine. The preparation system comprises a reactor, a gas-liquid separator, a circulating pump and an extraction pump, the reactor comprises: an inner nozzle, which is used for introducing 2-chloro-5-methylpyridine; the outer spraying nozzle is used for introducing chlorine, and a spraying opening of the inner spraying nozzle is formed in the outer spraying nozzle; the outlet end of the outer spray nozzle is located in the flow dividing pipe; the shunt pipe is used for enabling reaction materials of 2-chloro-5-methylpyridine and chlorine to form internal circulation flow; the vertical shell is provided with a reaction cavity, and the flow dividing pipe is arranged in the reaction cavity in the axial direction of the vertical shell. The polychloromethylpyridine prepared by adopting the preparation system disclosed by the invention is relatively high in yield and relatively low in cost.