54 results about "Tetrachloroethylene" patented technology

The invention belongs to the technical field of new materials, and discloses a polyolefin dissolving agent as well as a preparation method and application thereof. The cleaning agent is composed of modified long-carbon-chain imidazole dinitrile amine salt, modified long-carbon-chain imidazole long-carbon-chain anion salt, betaine salt, imidazole acetate, imidazole long-carbon-chain anion salt, quaternary ammonium long-carbon-chain anion salt, imidazole bis (fluorosulfonyl) imide salt, imidazole hexafluorophosphate and long-carbon-chain anion and cation liquid. Under the condition of 180-210 DEG C, polyolefin (PP or PE) with the molecular weight of 50-8 million can be dissolved by adopting the polyolefin dissolving agent disclosed by the invention, and effective extrusion can be realized by adopting a twin-screw extruder after dissolution. After PP / PE powder is dissolved by adopting the polyolefin dissolving agent disclosed by the invention, sheet casting or spinning is carried out, casting sheets or PP / PE fibers are washed by using ethanol / dichloromethane / hydrocarbon / tetrachloroethylene to remove ionic liquid, and a polyolefin diaphragm or polyolefin fibers can be prepared.

The invention discloses a method for synthesizing a dichloroacetyl compound, which comprises the following steps: tetrachloroethylene and an acid are subjected to an addition reaction at 100-200 DEG C to obtain an adduct, then the adduct is subjected to an acidolysis, hydrolysis or alcoholysis reaction to obtain the dichloroacetyl compound, the acid for the addition reaction is at least one of sulfuric acid, trifluoromethanesulfonic acid, methanesulfonic acid and phosphoric acid, and the acid for the alcoholysis reaction is at least one of sulfuric acid, trifluoromethanesulfonic acid, methanesulfonic acid and phosphoric acid. The molar ratio of the tetrachloroethylene to the acid is 1: (1-10). By controlling the types of acids and increasing the temperature of the addition reaction, the addition reaction of tetrachloroethylene and acids in the absence of a catalyst is realized. Double bonds of tetrachloroethylene and hydrogen protons are subjected to an addition reaction in a strong acid environment to form a cationic intermediate, then the cationic intermediate is combined with acid radical anions to form an adduct, and the adduct intermediate is high in activity, unstable and free of separation and can be directly subjected to a hydrolysis reaction, an acidolysis reaction or an alcoholysis reaction with another substrate (such as water, acid or alcohol) respectively. The synthesis of dichloroacetyl series compounds is realized, and the route has universality and diversity.

The invention provides a method for preparing anti-permeation anti-corrosion filler by using waste rubber and anti-corrosion paint, and belongs to the technical field of paints.The method comprises the steps that the waste rubber is smashed and sieved to obtain rubber particles, then the rubber particles are sequentially subjected to acid pickling, alkali washing and water washing and dried, then the rubber particles are added into tetrachloroethylene to be chlorinated, flocculent products are removed through an air blowing rotary furnace, and the anti-permeation anti-corrosion filler is obtained; and adding the rubber particles into tetrachloroethylene again for chlorination, carrying out bubbling operation, and draining to obtain the anti-permeation and anti-corrosion filler. The chlorine content of the impermeable anticorrosive filler prepared by the method is increased, the corrosion resistance is enhanced, and an anticorrosive coating prepared from the filler can effectively solve the problem of diffusion of water molecules, also can effectively inhibit permeation and migration of corrosive medium chloride ions, and can greatly improve the impermeability.

The application discloses resin-coated urea slow-release fertilizer, a preparation method and application thereof, and first prepares resin-coated urea slow-release fertilizer, adopts polystyrene, polyethylene, talcum powder and starch mixture to be dispersed and heated in tetrachloroethylene to prepare coating liquid, then sprays the coating liquid on the surface of dried urea after pretreatment, and with evaporation of the solvent, a resin layer is formed on the particle, and the resin-coated urea slow-release fertilizer is obtained. The resin-coated urea can simulate atmospheric nitrogen deposition, and can more truly simulate the nitrogen deposition mode.

The application provides a method for preparing anti-permeation anticorrosive filler from waste rubber and anticorrosive paint, and belongs to the technical field of paint, which comprises the following steps: crushing and sieving waste rubber to obtain rubber particles, then sequentially performing acid pickling, alkali washing and water washing, and drying, then adding the rubber particles into tetrachloroethylene for chlorination, then removing flocculent products by using a blast rotary furnace, then adding the rubber particles into tetrachloroethylene again for chlorination and performing bubbling operation, and then draining to obtain the anti-permeation anticorrosive filler. The anti-permeation anticorrosive filler prepared by the method has improved chlorine content and enhanced corrosion resistance, the anticorrosive coating prepared by using the filler can effectively solve the diffusion problem of water molecules, can effectively inhibit the permeation and migration of corrosion medium chloride ions, and can greatly improve the anti-permeation performance.

The invention relates to the technical field of dry cleaning machines, in particular to a dry cleaning machine door opening air purification and regeneration system which comprises a negative pressure gas capturing device and a carbon adsorber, the gas capturing device comprises a negative pressure gas suction port, a negative pressure gas suction channel and a catalytic device, and the negative pressure gas suction port is formed in the circumferential direction of a door frame of a dry cleaning machine; the negative-pressure air suction channel is communicated with the negative-pressure air suction port and the catalytic device, the catalytic device is communicated with the carbon adsorber through an air pipeline, a steam heating pipe, an electric heating pipe, a heat pump and a cold pump are arranged in the catalytic device, and through multi-stage temperature regulation (condensation and heating), the treatment effect on gaseous tetrachloroethylene is remarkably improved; the stainless steel container is filled with granular activated carbon powder, has high specific surface area and good adsorption performance, and can effectively adsorb gaseous tetrachloroethylene, so that the concentration of the tetrachloroethylene in the barrel is reduced to 2g / m < 3 > or below.

The invention provides an oxygen barrier layer, a preparation method of the oxygen barrier layer and a flexible resin plate with textured flat-top lattice points on the surface, polymer particles are formed by in-situ polymerization of polyurethane resin containing free isocyanate monomers and oxygen barrier resin containing hydroxyl in an organic solvent, and solid filler does not need to be additionally added; the molar content of hydroxyl in the oxygen inhibitor resin is greater than the molar content of isocyanate in the isocyanate monomer, so that the oxygen inhibitor is excessive, and the oxygen inhibitor resin, the polyurethane resin and the flatting agent which do not participate in the reaction jointly participate in film formation. Raw materials of the oxygen barrier layer can be dissolved in a mainstream commercially available flexographic flushing medium, such as an organic solvent containing tetrachloroethylene / n-butyl alcohol or a high-end environment-friendly developing solution containing terpene or commercially available Shanghai sensitive morning, and a photopolymerization reaction does not occur. After exposure, laser ablation and plate washing by a flexible plate washing medium, the flexible resin plate with the flat-top lattice points with the sand meshes on the surface is prepared, and the oxygen barrier layer is completely removed without residues in the plate washing process.

The present invention relates to a method for resource utilization of waste alkali and waste hydrochloric acid produced as by-products of a tetrachloroethylene heavy component incineration device, comprising the following steps: (1) filtering the waste alkali and waste hydrochloric acid produced as by-products of the tetrachloroethylene heavy component incineration device respectively to obtain a waste alkali filtrate and a waste hydrochloric acid filtrate; (2) subjecting the waste hydrochloric acid obtained in step (1) to organic matter degradation treatment and filtering again; (3) neutralizing the waste alkali filtrate and the waste hydrochloric acid; (4) introducing the neutralized brine obtained in step (3) into a clarification tank, filtering the clarified supernatant to obtain a filtrate; and (5) subjecting the filtrate in step (4) to adsorption treatment and then A / O oxidation treatment to obtain a brine with a COD of less than 100 mg / L. The present invention not only solves the problem that waste hydrochloric acid containing organic matter is difficult to treat, but also solves the problem that the brine generated after acid-base neutralization is directly discharged and wastes resources, thereby reducing environmental pollution, turning waste into treasure, and reducing production costs for enterprises.

The invention relates to a method for measuring the concentration of tetrachloroethylene in water, which comprises the following steps: (1) detecting a standard working solution of tetrachloroethylene by using a high performance liquid chromatograph to obtain a standard working curve of the tetrachloroethylene absorption peak area and absolute concentration of the standard working solution of tetrachloroethylene; (2) detecting a water sample to be detected by using the high performance liquid chromatograph to obtain the tetrachloroethylene absorption peak area of the water sample to be detected; a mobile phase used in the detection of the high performance liquid chromatograph comprises an organic phase and ultrapure water, and the volume ratio of the organic phase to the ultrapure water is (70-90): (30-10); the detection wavelength of the detection is 212 to 216 nm; the temperature of a column oven of the high performance liquid chromatograph is 35-40 DEG C. According to the method disclosed by the invention, the peak appearance time is short, the separation effect of the detected main peak and the impurity peak is good, the fitting degree of the obtained standard working curve is high, the separation degree of the main peak and the impurity peak in the detection of an actual water sample containing tetrachloroethylene is high, and the detection result is reliable.

The invention provides an aerogel composite purification material as well as a preparation method and application thereof. According to the preparation method, medulla stachyuri is used as a raw material, the aerogel composite purification material can be prepared through alkali liquor dipping, amino modification, MOFs in-situ growth and directional freeze-drying forming treatment in sequence, all the steps are matched with one another to form a graded porous structure, pyridine ring groups, pyrrole ring groups and active metal ions are introduced, the several components have a synergistic effect, and the purification effect is good. The purifying material can efficiently adsorb air pollutants, such as benzene and benzene series, formaldehyde, trichloroethylene, tetrachloroethylene, nitrogen oxide, CO, ammonia, nicotine and the like. The invention provides the aerogel composite purification material prepared by the preparation method. The invention also provides an application of the aerogel composite purification material as an adsorption material in air purification so as to realize effective removal of indoor air pollutants.

The utility model relates to an ultra-high molecular weight polyethylene fiber extracting agent cleaning device, which is used for cleaning ultra-high molecular weight polyethylene fibers with residual extracting agents after extraction, is arranged between an extraction tank and a drying box and comprises a silk passing channel extending from the extraction tank to a silk inlet of the drying box. The middle of the silk passing channel is bent downwards and back, a cleaning tank containing a cleaning agent is formed in the bent position, the cleaning tank is connected with an oscillator, and an extracting agent in the ultra-high molecular weight polyethylene fibers entering the cleaning tank in the silk passing channel is separated from the ultra-high molecular weight polyethylene fibers and settles at the bottom of the cleaning tank. When the extracting agent is tetrachloroethylene, the cleaning agent is water or plasma liquid. The ultra-high molecular weight polyethylene fiber containing the extraction agent after extraction is washed in the cleaning agent, and all or most of the extraction agent is removed.

A method for separating R22 and HFP, the method comprising: a mixing step for obtaining a mixture for extraction, the mixture being a mixture of a first mixture containing R22 and HFP and an extraction solvent containing an organic solvent selected from the group consisting of dichloromethane, chloroform, 1, 1, 1-trichloroethane, 1, 1, 2-trichloroethane, 1, 1, 1, 2-tetrachloroethane, 1, 1, 2, 3, 3-tetrachloroethane, 1, 1, 2, 3-tetrachloroethane, 1, 1, 2, 3, 3-tetrachloroethane, 1, 1, 2, 3, 3-tetrachloroethane, 1, 1, 2, 3-tetrachloroethane, 1, 1, 2, 3, 3-tetrachloroethane, 1, 1, 2, 3-tetrachloroethane, 1, 1, at least one chlorine-containing compound selected from the group consisting of 1, 1, 1, 2-tetrachloroethane, pentachloroethane, hexachloroethane, trichloroethylene and tetrachloroethylene; and an extraction distillation step in which the mixture for extraction is distilled to obtain a first distillate having HFP as the main component and a first bottoms product having the extraction solvent as the main component and containing R22, respectively, and an extraction distillation step in which the mixture for extraction is distilled to obtain a first distillate having HFP as the main component and a first bottoms product having R22 as the main component.

The invention relates to a glue comprising a polystyrene slurry and a chlorinated solvent selected from trichloroethylene, tetrachloroethylene and a mixture thereof. The invention also relates to the method for preparing the glue according to the invention. The invention also relates to a bottle containing the glue according to the invention.

The invention provides a modified loofah sponge fiber composite material as well as a preparation method and application thereof. According to the preparation method, natural loofah sponge is mainly used as a raw material and is sequentially subjected to amino modification, aerogel preparation and fiber membrane composite treatment, so that the aerogel and a spandex fiber membrane are introduced into the loofah sponge, the finally prepared modified loofah sponge fiber composite material has a hierarchical pore structure, and the physical adsorption performance of the loofah sponge fiber composite material on air pollutants is effectively improved; groups such as amino groups are introduced into the loofah sponge, so that the chemical adsorption performance on air pollutants can be improved; the spandex fiber membrane can effectively filter particulate matters such as PM2.5; therefore, the modified loofah sponge fiber composite material has better selective adsorption on aldehydes such as formaldehyde and the like, and meanwhile has better removal capacity on air pollutants such as PM2.5, benzene series, nicotine, NOX, CO, trichloroethylene or tetrachloroethylene and the like, so that the air pollutants in the environment are effectively removed, and therefore, the modified loofah sponge fiber composite material has the advantages of environmental protection, environmental protection and the like. The material can be used as a pollutant purification material in air pollutant adsorption.

The utility model relates to the technical field of dry cleaning machines, and discloses a full-automatic totally-closed tetrachloroethylene dry cleaning machine which comprises a dry cleaning machine body, a controller is arranged on one side of the front face of the dry cleaning machine body, a roller is arranged in the dry cleaning machine body, and a machine door is hinged to the position, corresponding to the roller, of the front face of the dry cleaning machine body. Four groups of mounting grooves are formed in the dry cleaning machine body around the outer side of the roller in an array mode, mounting rails are fixedly mounted in the mounting grooves, and filters are detachably mounted in the mounting rails; according to the full-automatic totally-closed tetrachloroethylene dry cleaning machine, a straight rod is driven to slide outwards by pulling a pull handle, that is, an extrusion rod is driven by a connecting plate to approach and extrude an elastic plate, and then the elastic plate is extruded and deflected into a movable groove and moved out of a clamping groove, so that a limiting effect is not played any more, and at the moment, a sliding edge part can be pulled out of a mounting rail; therefore, the filter is convenient to disassemble, clean or replace.

The utility model discloses a reaction device for co-producing trichloroethylene and tetrachloroethylene by using a dichloroethane oxychlorination method, and relates to a trichloroethylene and tetrachloroethylene preparation device, which comprises a dichloroethane storage tank, an HCL storage bottle, an oxygen storage bottle, a tubular reactor, a heating device, a primary preheater, a gas mixer and a fused salt heat conduction sleeve, the primary preheater is connected with the gas mixer, the HCL storage bottle and the oxygen storage bottle are respectively connected with the mixing pipe section, the mixing pipe section is respectively connected with an inlet of the gas mixer and the middle part of the tubular reactor, and the gas mixer is connected with the upper end of the tubular reactor; the fused salt heat conduction sleeve is sleeved outside the tubular reactor, heat conduction fused salt is arranged in the fused salt heat conduction sleeve, and the heating device is arranged outside the fused salt heat conduction sleeve. The method has the advantages that heat release is dispersed, local reaction pressure is small, and the yield ratio of trichloroethylene to tetrachloroethylene can be rapidly adjusted according to needs.

Adhesive obtained from an expanded polystyrene magma. The invention relates to an adhesive comprising a polystyrene magma and a chlorinated solvent selected from trichloroethylene, tetrachloroethylene, and mixtures thereof. The invention also relates to the process for preparing the adhesive according to the invention. The invention also relates to a bottle containing [Figure for the abstract: None]

The utility model relates to the technical field, in particular to a methane chloride crude distillation tower residual liquid separation and recovery device which comprises a methane chloride crude distillation tower, the tower bottom of the methane chloride crude distillation tower is connected with a feeding port of a rectifying tower through a third pipeline, and the tower top of the rectifying tower is connected with a superheater through a first connecting pipe. The superheater is connected with a tetrachloroethylene reactor through a pipeline; a tower kettle of the rectifying tower is connected with an incinerator through a pipeline; the tower top of the rectifying tower is connected with a crude methane chloride feeding pipe through a connecting pipe II, and the crude methane chloride feeding pipe is connected with a feeding hole of a methane chloride crude distillation tower; according to the utility model, the methane chloride and the dichloromethane in the residual liquid of the methane chloride crude distillation tower can be separated and recovered, the cost is lower, the risk is small, and the damage to the environment is reduced.

The present invention relates to a hybrid plastic regenerated polyethylene composition having a melt flow rate (ISO 1133, 2.16 kg, 190 DEG C) of from 0.1 to 1.5 g / 10 min; a density of 938 to 985 kg / m3, and comprising 35 wt% or more of a regenerated polyethylene fraction (rPE); wherein the hybrid plastic regenerated polyethylene composition has: (a) a total amount of ethylene units (C2 units) of at least 95.0 wt%, measured by 13C-NMR of the d2-tetrachloroethylene soluble fraction; (b) the total amount of continuous C3 units derived from polypropylene (PP) is from 0 to 3.0 wt%, as determined by a quantitative 13C {1H}-NMR measurement of the soluble fraction; and (c) an environmental stress cracking resistance (ESCR) of at least 1000 hours as determined by the Bell test according to IEC 60811-406 method B wherein the hybrid plastic regenerated polyethylene composition further comprises: at least one native polyethylene component (B), optionally blended with carbon black, and optionally a native polyethylene component (B1) different from the native polyethylene component (B), optionally blended with carbon black, and optionally blended with carbon black, the present invention relates to a hybrid plastic regenerated polyethylene composition comprising at least one thermoplastic elastomer, optionally blended with carbon black, where the hybrid plastic regenerated polyethylene composition has a tear resistance of at least 24 N / mm as determined according to BS 6469 99.1 node. This hybrid plastic regenerated polyethylene composition has high purity in terms of polyethylene content, low contaminant content, high homogeneity, improved mechanical properties, and good optical properties. The invention also relates to a process for its preparation, to the aforementioned regenerated polyethylene fraction (rPE) obtainable or by a process for regenerating a hybrid plastic regenerated stream, to articles made from the aforementioned hybrid plastic regenerated polyethylene composition, and to the use of the aforementioned hybrid plastic regenerated polyethylene composition in wire and cable applications.

The invention discloses a resin-coated urea slow-release fertilizer and a preparation method and application thereof.The resin-coated urea slow-release fertilizer is prepared firstly, specifically, a mixture of polystyrene, polyethylene, talcum powder and starch is dispersed and heated in tetrachloroethylene to prepare coating liquid, then the surface of dried urea is pretreated and then sprayed with the coating liquid, and the resin-coated urea slow-release fertilizer is obtained; along with evaporation of the solvent, a resin layer is formed on the particles, and the resin coated urea slow-release fertilizer is obtained. The resin-coated urea is adopted to simulate atmospheric nitrogen sedimentation, so that a nitrogen sedimentation mode can be simulated more truly.

The present invention is applicable to the field of environmental engineering technology, and provides a carboxymethyl-β-cyclodextrin enhanced reaction composition and its application. The present invention adopts a chemically degradable system that is simple to obtain, green and environmentally friendly, and biodegradable. The operation is safe and simple. By using carboxymethyl-β-cyclodextrin as a chelating agent for divalent iron and a solubilizer for tetrachloroethylene, the reaction system of sodium persulfate and divalent iron is enhanced, the content of effective divalent iron in the reaction system and the solubility of tetrachloroethylene pollutants are increased, and the degradation rate of tetrachloroethylene pollutants is improved. This reaction system is applicable to the aquifer environment with a pH of 1-7 and a temperature of 10-25 °C, and is relatively less affected by the types and concentrations of common cations and anions and the concentration of humic acid in the aquifer environment. The reaction technology and process are simple, the degradation rate of tetrachloroethylene pollutants can reach more than 95%, and at the same time, the complete degradation and mineralization of tetrachloroethylene pollutants can be achieved.

The utility model discloses a rectifying device for separating trichloroethylene and tetrachloroethylene, which comprises a rectifying tower, an inner cavity is arranged in the rectifying tower, an adjustable mounting mechanism is arranged in the inner cavity, a plurality of contact mechanisms are mounted on the adjustable mounting mechanism, each contact mechanism comprises a tower plate, a flow guide pipe is arranged at the top of one side of each tower plate, and a plurality of flow guide holes are formed in the flow guide pipes. The top of the other side of the tower plate is fixedly connected with an overflow weir, and one side of the overflow weir is provided with a liquid discharging pipe. According to the rectification device for separating trichloroethylene and tetrachloroethylene, a liquid phase is blocked by an overflow weir and partially stays on a tower plate, a gas phase enters a gas outlet pipe from bottom to top and is discharged from a gas outlet hole to be in contact with the liquid phase, and in the process, the pressure of the flowing gas phase pushes a driving blade to rotate, and the driving blade rotates to drive a guide plate to rotate, so that the trichloroethylene and tetrachloroethylene are separated. The liquid phase is stirred and guided, so that the gas phase and the liquid phase are fully mixed and contacted, and the rectification effect of trichloroethylene and tetrachloroethylene can be improved.

This invention relates to the field of wastewater treatment technology, and discloses a biochar-supported potassium ferric sulfide material and its application in pollutant removal. The material is prepared through the following steps: iron salt, sulfur source, and biomass are ground and thoroughly mixed in a specific ratio to obtain a first mixture; the first mixture is reacted under an inert gas atmosphere at a temperature range of 600-750°C for 1-3 hours, and then cooled to room temperature to obtain a second mixture; the second mixture is then washed and vacuum dried. The preparation steps of the material only include grinding and mixing, heating, washing, and drying, each step being relatively simple. The entire process involves only one pyrolysis, does not involve toxic gases, and is simple and safe to operate. Furthermore, experimental verification shows that the material has good effects on removing trichloroethylene, tetrachloroethylene, chlorobenzene, ciprofloxacin, and methylene blue from water.

The invention provides a strong degreaser composition for a polyester / spandex fabric as well as a preparation method and application of the strong degreaser composition. The strong degreaser composition is prepared from the following components in percentage by weight: 8 to 12 percent of amine oxide surfactant, 14 to 24 percent of polyol ester, 4 to 16 percent of modified aliphatic amine polyether cationic surfactant, 8 to 17 percent of fluorosilicone self-emulsifying surfactant, 0 to 6 percent of solubilizer and 32 to 64 percent of water, wherein the total weight is 100 percent. The strong degreaser prepared by the invention is low in surface tension, strong in permeation and wetting capacity, strong in oil stain emulsification and dispersion stability, capable of preventing oil stains from adhering to fabrics and equipment, thorough in oil removal, free of APEO, phosphorus, tetrachloroethylene, plasticizers and the like, and especially suitable for treating polyester and spandex blended fabrics which are high in oil content, heavy in oil stain and need to be repaired for cloth cover oil spots; oil stains can be thoroughly removed under the acidic condition, one-bath one-step oil removal and dyeing can be achieved, damage to fibers is small, and energy conservation and efficiency improvement are achieved.

The invention relates to a water-gas alternate flooding gas solubilization and crude oil viscosity reduction method and a construction method thereof in the field of oil and gas development. The method comprises gas flooding and water flooding processes which are alternately carried out; before gas drive, a solubilizer is added into supercritical CO2 in advance to obtain a supercritical fluid I, and the solubilizer is formed by compounding tetrachloroethylene and a synergist; before water flooding, a water-soluble surfactant is added into matrix water in advance to obtain a second water flooding fluid, and the water-soluble surfactant is polyoxyethylene ether and / or polyoxyethylene ester. The gas solubilization and crude oil viscosity reduction method for water-gas alternating flooding has the following advantages that the compounded solubilizing agent and viscosity reducer are added in the CO2 flooding stage and the matrix water flooding stage respectively, and the solubilizing agent capable of being fully mixed with CO2 is prepared by taking the organic solvent tetrafluoroethylene as a main component and cooperating with the synergist; a surfactant with excellent emulsifying performance is compounded with matrix water to form the emulsifying viscosity reducer with relatively strong oil washing capacity. The expansion, viscosity reduction and extraction effects of CO2 are fully exerted in the water-gas alternating flooding process, the viscosity reduction and oil displacement effects of a water phase are improved, and water-gas alternating synergistic interaction is achieved.

The invention discloses harmless tail gas treatment equipment for tetrachloroethylene, and relates to the technical field of tail gas treatment. The tail gas treatment equipment comprises a machine shell, a gas inlet channel, a pre-filtering layer, an exhaust port, an exhaust fan, a supporting frame, a zeolite rotating wheel, an adsorption area, a driving motor, an incinerator, a fixed ring pipe, a desorption assembly, a regulation and control assembly and a cooling assembly. In the purification process, the desorption assembly enables harmful substances to be finally discharged into the incinerator along with air flow, and the cooling assembly recovers the zeolite rotating wheel heated by the desorption assembly to the working temperature suitable for adsorption. The regulation and control assembly can be automatically regulated under the influence of the wind speed, so that the area of the desorption assembly is enlarged, the desorption time of the zeolite rotating wheel passing through the desorption assembly is prolonged, and meanwhile, the regulation and control assembly can also mix and stir the gas which enters the zeolite rotating wheel and is not purified, so that the mixing uniformity of harmful substances in the gas is improved.

This invention discloses a paper-based sensor modified with a metal-organic framework (MOF) exhibiting aggregation-induced emission (AIE) and its application in formaldehyde detection. The paper-based sensor is prepared by in-situ growth of an AIE on a paper substrate. The AIE is formed by complexing zinc chloride with tetra(4-pyridinebiphenyl)ethylene in a mixed solvent of tetrachloroethylene and methanol. This paper-based sensor features low cost, minimal environmental pollution, small size for handheld use, and high stability. It can detect volatile formaldehyde using both fluorescence and chemiluminescence methods, exhibiting high sensitivity, a wide linear range, and rapid response. This not only provides a new approach for the real-time detection of gaseous formaldehyde but also enriches and expands the application of AIE-modified MOFs on paper substrates.

The utility model relates to the technical field of environmental protection detection, in particular to a device for detecting petroleum hydrocarbon in well site polluted soil, which comprises a tetrachloroethylene storage box, an outlet of the tetrachloroethylene storage box is connected with an inlet of an extraction mechanism, and the tetrachloroethylene storage box is used for feeding tetrachloroethylene in the tetrachloroethylene storage box into the extraction mechanism. An outlet of the extraction mechanism is connected with a cuvette of an infrared oil meter through a sample injector; the extraction mechanism, the tetrachloroethylene storage box, the sample injector and the infrared oil measuring instrument are all arranged on the chassis. The device is simple to operate and high in automation degree, and solves the problem that the petroleum hydrocarbon in the soil cannot be accurately and quickly detected on site.

The invention discloses a method for recovering chlorine in trifluorotrichloroethane production, which comprises the following steps of: a, heating, gasifying and separating crude products, namely organic phases such as liquid chlorine, hydrogen fluoride, hydrogen chloride and trifluorotrichloroethane from an acidic material receiving tank, separating out acidic gases such as chlorine, and carrying out alkali washing on the separated trifluorotrichloroethane; b, cooling the separated acid gases such as chlorine and the like, and separating out uncondensed chlorine; c, fully mixing the separated chlorine gas with tetrachloroethylene; and d, feeding the chlorine-absorbed tetrachloroethylene into a fluorination reaction kettle to participate in the reaction. The method can effectively reduce the unit consumption of liquid chlorine and the consumption of liquid caustic soda.

The utility model belongs to the technical field of chemical production equipment, and relates to a fluorination reaction device for trichlorotrifluoroethane. The fluorination reaction device comprises a reactive distillation tower and a fluorination reaction kettle, the fluorination reaction kettle is connected with a hydrogen fluoride feeding pipe and a chlorine feeding pipe, a discharging pipeline is arranged between the fluorination reaction kettle and the reactive distillation tower, a backflow pipeline is arranged between the reactive distillation tower and the fluorination reaction kettle, the reactive distillation tower is further provided with a tetrachloroethylene feeding pipe, and the tetrachloroethylene feeding pipe is connected with a chlorine feeding pipe. And the joint of the discharge pipeline and the reactive distillation tower and the joint of the return pipeline and the reactive distillation tower are positioned below the tetrachloroethylene feed pipe. In the reaction process, a tetrachloroethylene raw material is conveyed into the reaction rectifying tower through the tetrachloroethylene feeding pipe and is in contact with high-temperature crude gas from the bottom of the reaction rectifying tower, and the tetrachloroethylene absorbs unreacted chlorine in the crude gas and returns the unreacted chlorine to the fluorination reaction kettle, so that the utilization rate of chlorine is increased, and the production cost is reduced. The chlorine content in the trifluorotrichloroethane crude product is reduced, and the consumption of alkali in subsequent alkali washing is reduced.