23 results about "Polychloroprenes" patented technology

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 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.

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.

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 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 relates to the technical field of food detection, in particular to a method for detecting polychlorinated naphthalene in food. The method for detecting polychlorinated naphthalene in food comprises the following steps: extracting a homogeneous food sample by using a mixed solution of n-hexane and dichloromethane, centrifuging, taking supernate, carrying out nitrogen blowing until the supernate is nearly dry, and dissolving by using n-hexane; a solid-phase extraction column of pentafluorophenyl bonded silica gel is adopted to purify a sample solution, and interferents such as grease are effectively removed by optimizing activation, sample loading, leaching and elution of a solvent system; carrying out nitrogen blowing concentration and solvent replacement on the purified eluent, detecting in a multi-reaction monitoring mode by adopting a gas chromatography-tandem mass spectrometry method, and quantifying by adopting an internal standard method; the detection method provided by the invention has the advantages of high pretreatment efficiency, good purification effect, capability of remarkably reducing matrix interference, high sensitivity, good accuracy, simplicity and convenience in operation and the like, and is suitable for simultaneously detecting various polychlorinated naphthalene homologues in animal-derived and plant-derived foods.

The application discloses a high-activity VOCs waste gas treatment composite catalyst and a preparation method thereof, and belongs to the field of environmental protection catalysis technology. The high-activity VOCs waste gas treatment composite catalyst is composed of the following components in percentage by weight: a manganese / cerium / bismuth / lanthanum quaternary composite metal oxide 3-22%, a modified attapulgite-stellerite composite carrier 70-92%, a tungsten-ytterbium composite additive 2-7% and a high-temperature-resistant binder 0.8-2.5%. In the manganese / cerium / bismuth / lanthanum quaternary composite metal oxide, the molar ratio of manganese, cerium, bismuth and lanthanum is 1:(0.6-1.0):(0.3-0.6):(0.2-0.4). The application adopts the manganese / cerium / bismuth / lanthanum quaternary composite metal oxide as a core active component, and the quaternary components form a strong synergistic effect: the manganese oxide provides core oxidation active sites, realizes deep oxidation of VOCs; the cerium oxide constructs an efficient oxygen storage and release system, improves the oxygen vacancy content and the oxidation and reduction performance; the bismuth oxide precisely regulates the catalyst surface acid sites, promotes the C-Cl bond breaking and dechlorination process of chlorine-containing VOCs, and inhibits the generation of polychlorinated by-products.

The invention relates to the field of microorganisms, and discloses a construction method and application of an electroactive flora for reductive degradation of organic pollutants, the construction method of the electroactive flora for reductive degradation of the organic pollutants comprises the following steps: obtaining a bacterial source containing electrochemical active bacteria, degrading bacteria and biological enhancement bacteria, carrying out selective culture medium screening and antibiotic gradient domestication to obtain a tolerant flora; respectively culturing electrochemical active bacteria, degrading bacteria and biological enhancement bacteria in the tolerant flora to logarithmic phases, adjusting the concentration of a bacterial suspension, and mixing according to a preset proportion to obtain a mixed bacterial suspension; inoculating the mixed bacterial suspension into a culture medium, and performing anaerobic treatment and constant-temperature culture to obtain the electroactive flora. Through directional screening and antibiotic gradient domestication, the tolerance and functional specificity of the flora are enhanced, and the regulation and combination of electrochemical active bacteria, degrading bacteria and biological enhancement bacteria are combined, so that efficient reduction degradation of persistent organic pollutants such as sulfonamide antibiotics, polychlorophenols, polycyclic aromatic hydrocarbons and the like is realized.

The invention provides a preparation method of environment-friendly chloro-nitroaniline and the environment-friendly chloro-nitroaniline prepared by the method. The preparation method of the environment-friendly chloro-nitroaniline comprises the following steps: dispersing nitroaniline in a sulfuric acid solution, and pulping to obtain a sulfuric acid solution of nitroaniline; mixing hydrochloric acid with a sulfuric acid solution of nitroaniline, adding an oxidizing agent, and carrying out chlorination reaction to obtain a chlorination reaction product; and carrying out solid-liquid separation on the chlorination reaction product to obtain mother liquor and chloronitroaniline. According to the preparation method of the environment-friendly chloro-nitroaniline, generation of polychlorophenol and polychlorobenzene in the nitroaniline chlorination reaction process can be reduced, and the prepared dye directly meets the requirements of OEKO-TEX 100.

The invention relates to the technical field of chemical synthesis, and discloses a preparation method and application of a pyrimidine derivative. The preparation method of the pyrimidine derivative comprises the following steps: in a solvent I, contacting a polychloro-substituted pyrimidine compound, a cyanate compound and a phase transfer catalyst, and carrying out a reaction I to obtain the pyrimidine derivative, according to the application of the pyrimidine derivative, boscalid is synthesized by adopting the prepared pyrimidine derivative as a catalyst, 2-chloronicotinic acid can directly react with parachloroaminobiphenyl to generate boscalid, and the acyl chloride synthesis step is omitted.

The invention belongs to the technical field of environmental catalytic materials, and particularly discloses a Ru-Zr / CePO4 catalyst for inhibiting polychlorinated by-products as well as a preparation method and application of the Ru-Zr / CePO4 catalyst. The catalyst comprises a CePO4 carrier and an active component loaded on the surface of the CePO4 carrier; the active component comprises a Zr species and a Ru species; the catalyst has a multi-phase interface structure, and comprises a Ru0 / CePO4 interface, a RuOx / CePOO interface, a ZrOx / CePO4 interface and a RuOx-ZrOx / CePO4 interface. An acid-base pair of CePO4 and a ZrOx / CePO4 interface promote dichloroethane adsorption dechlorination and rapid removal of HCl; the electron-rich Ru species and the RuOx-ZrOx interface enhance lattice oxygen migration and water activation, and the vinyl chloride intermediate is subjected to rapid low-temperature oxidation hydrolysis. Multi-interface cooperation blocks Cl2 circulation from the source and inhibits polychlorinated by-products. The T90 of the catalyst reaches 260 DEG C at 260 DEG C, the CO2 selectivity is close to a theoretical value, and the catalyst has excellent water resistance, chlorine poisoning resistance and long-term stability and is wide in application prospect.

The application discloses a preparation method of 4-chloro-1-naphthol and belongs to the technical field of organic synthesis. 1-naphthol is used as a raw material to react with a deprotonation reagent, then reacts with a borate ester, and after acidification, 1-hydroxynaphthalene-2-boronic acid is generated; then, the 1-hydroxynaphthalene-2-boronic acid reacts with a chlorination reagent to obtain 4-chloro-1-hydroxynaphthalene-2-boronic acid; finally, the 4-chloro-1-hydroxynaphthalene-2-boronic acid reacts with an organic base under the action of copper sulfate to remove the boronic acid and generate 4-chloro-1-naphthol. In the application, 1-naphthol is used as a starting raw material, a boronic acid group is first introduced at the 2-position, so that chlorination reaction is positioned at the 4-position in the later stage, generation of ortho-position, polychlorinated by-products is effectively inhibited, the route is short, the operability is good, and the overall yield is high.

The pretreatment method comprises the following steps: weighing a disperse dye sample, putting the disperse dye sample into a flask, adding DMF (Dimethyl Formamide) to completely dissolve the sample, adding a sulfuric acid solution and an internal standard solution, carrying out steam distillation, adding potassium carbonate into a distillate receiving bottle, and after the distillation is completed, carrying out suction filtration to obtain a filtrate; sucking the distillate into a separating funnel, adding acetic anhydride, triethylamine and normal hexane, fully oscillating, removing the lower layer, transferring the upper layer organic phase into a conical flask with a plug, adding anhydrous sodium sulfate, continuously shaking for dehydration, standing, taking the supernatant, and carrying out GC / MS (Gas Chromatography / Mass Spectrometry) analysis. The DMF with strong polarity and high boiling point is matched with a disperse dye molecular structure, so that the PCPs dissolution and extraction efficiency is remarkably improved, and the recovery rate is stabilized at 90%-120%, RSDlt; and the detection result is stable and reliable.

The invention relates to the technical field of food detection, in particular to a method for detecting polychlorinated naphthalene in food based on magnetic solid-phase extraction-gas chromatography-mass spectrometry. The invention provides a method for detecting polychlorinated naphthalene in food based on magnetic solid phase extraction-gas chromatography-mass spectrometry. The method comprises the steps of sample extraction, magnetic adsorbent adsorption, elution, nitrogen blowing redissolution, GC-MS analysis and the like. The prepared magnetic adsorbent is prepared from tannic acid, nano ferroferric oxide, a virtual template molecule template mixture, a functional monomer 4-vinyl-3-fluorophenylboronic acid (4-VFBA), a cross-linking agent ethylene glycol dimethacrylate (EGDMA) and the like through a polymerization reaction, and has high adsorption capacity and specific selectivity; the polychlorinated naphthalene detection method provided by the invention overcomes the defects of the traditional pretreatment technology, has the advantages of simplicity and convenience in operation, rapidness, high sensitivity, environmental friendliness and the like, and is suitable for efficiently and accurately detecting polychlorinated naphthalene in various foods such as grains and products thereof, meat and products thereof, aquatic products and products thereof, vegetables and the like.

The application provides a polychloropyridine amide derivative, a preparation method and application thereof. The polychloropyridine amide derivative is selected from the following structures:,, and ; the polychloropyridine amide derivative or a pesticide-acceptable salt, metal ion complex thereof provided by the application has excellent antibacterial activity. The preparation method is simple and easy to produce. The application provides application of the polychloropyridine amide derivative or the pesticide-acceptable salt, metal ion complex thereof in preparation of an antibacterial agent.

The application discloses a catalyst for treating catalytic combustion of CVOCs and a preparation method and application thereof. The preparation method comprises the following steps: (1) impregnating cerium nitrate and trimethyl phosphate on a carrier, drying, and calcining at 600-800 DEG C to form a modified carrier containing a cerium phosphate crystal phase; and (2) impregnating active metal ruthenium on the modified carrier, drying, and calcining to obtain the catalyst for treating catalytic combustion of CVOCs. The catalyst can be used for catalytic combustion degradation of dichloromethane, chlorobenzene, chloroethylene, dichloroethane, dichloroethylene, oxygen-containing chloropropane and other CVOCs. For catalytic combustion degradation of CVOCs, the catalyst can exhibit high activity, high chlorine resistance, low selectivity of polychlorinated by-products and high thermal stability, and has certain industrial application prospect.

The invention discloses a flue gas dioxin trapping and concentrating device and method based on temperature control. Belongs to the field of polychlorinated dibenzodioxin / furan (PCDD / Fs) sampling, and has the capabilities of trapping dioxin at 120-200 DEG C and thermally desorbing dioxin at 210-350 DEG C, so that the trapping and extraction of dioxin can be completed through temperature control. The device has the advantages of being simple in structure, convenient to operate and control and suitable for online operation.

The application discloses a production method of high-purity chloromethyl ether, and belongs to the technical field of chloromethyl ether, wherein a composite special catalyst is added in the production process, so that the reaction path is accurately controlled, the generation of by-products such as polychlorinated compounds and oligomers is greatly reduced, and the product purity is improved; the composite special catalyst adopts iron-calcium double active sites to synergistically catalyze the chloromethylation reaction, and the existence of the double sites makes the catalytic efficiency high; the composite special catalyst takes a carbon fiber skeleton as a carrier, the carbon fiber skeleton has a high specific surface area and a porous structure, and after being modified on a calcium base, the pore distribution is uniform, so that the uniform loading of active components can be realized, the diffusion and contact of reactants can be accelerated, the reaction can be promoted, and the impurity content is reduced; and the carbon fiber skeleton has good mechanical stability, can be quickly separated through filtration after the reaction, and can be reused after regeneration treatment, so that the catalyst cost is reduced, solid waste emission is reduced, and the green chemical industry concept is met.