43 results about "Tetrachloroethylene" patented technology

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 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.

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 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 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 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 belongs to the technical field of organic chemistry, and particularly relates to a separation and recovery method of a mixed solution. In order to solve the problem of high energy consumption of a rectification separation mode in the prior art, the invention provides a separation and recovery method of a mixed solution, which comprises the following steps: transferring the mixed solution containing tetrachloroethylene, hexachloroethane, hexachlorobutadiene and hexachlorobenzene into a melt crystallizer, and carrying out programmed cooling by using the melt crystallizer until the temperature of the mixed solution is 25-100 DEG C, so as to obtain a mixed solution containing tetrachloroethylene, hexachloroethane, hexachlorobutadiene and hexachlorobenzene; solidifying the high-melting-point substance in the mixture onto a crystallizer to obtain a product crystal; transferring the liquid phase as residual liquid into a residual liquid tank; raising the temperature to 185-190 DEG C to sublimate and condense hexachloroethane to form hexachloroethane crystals; heating the remaining product crystals to 220-230 DEG C for melting, and discharging the remaining product crystals into a product tank to obtain a hexachlorobenzene solution; and carrying out rectification separation on the residual liquid to obtain a tower top light component tetrachloroethylene product and a tower bottom heavy component hexachlorobutadiene product. The highest operation temperature is 250 DEG C or below, and the energy consumption is low.

This invention discloses a method and system for determining volatile halogenated hydrocarbons in dissolved gases of seawater, belonging to the field of analytical chemistry. The method employs direct gas injection combined with a six-way valve switching injection system, enabling the direct and simultaneous determination of seven volatile halogenated hydrocarbons in seawater: chloroform, carbon tetrachloride, trichloroethylene, bromodichloromethane, tetrachloroethylene, dibromochloromethane, and tribromomethane. This eliminates the need for organic solvents and complex pretreatment, filling a technological gap in this field. Validation shows a detection limit of 0.1–1.1 nmol / mol, a retention time RSD ≤ 0.20%, a concentration RSD ≤ 4.93%, and a relative error between -2.01% and 1.56%. The method exhibits advantages such as high sensitivity, good stability, simple operation, and environmental friendliness, and can be directly applied to fields such as marine environmental monitoring and seabed oil and gas resource exploration.

The utility model belongs to the technical field of catalyst regeneration, and relates to a chlorine injection device which comprises a chlorine tank and a nitrogen tank, the chlorine tank is connected with a chlorine injection pump, the chlorine injection pump is connected with a mixer, the nitrogen tank is connected with the mixer, the mixer is connected with a steam heater, and the steam heater is connected with a regenerator. The steam heater comprises a tank body, a heating pipe is arranged in the tank body, the heating pipe is spirally arranged in the tank body in a surrounding mode, the heating pipe is a hollow pipe and comprises a first spiral pipe and a second spiral pipe, the first spiral pipe and the tank body are coaxially arranged, and the second spiral pipe is arranged on the outer side of the first spiral pipe in a sleeving mode. The input ends of the first spiral pipe and the second spiral pipe are connected with the steam input pipe, and the output ends of the first spiral pipe and the second spiral pipe are connected with the steam output pipe. Compared with the prior art, the chlorine injection device can effectively solve the problems that the dispersity of tetrachloroethylene injected into the regeneration part of the dehydrogenation device is poor, and the chlorine injection of the catalyst is difficult.

The invention discloses a multi-stage control method for co-producing trichloroethylene and tetrachloroethylene by cracking tetrachloroethane. The multi-stage control method comprises the following steps: S1, preheating a tetrachloroethane raw material to 250-300 DEG C; s2, mixing the preheated tetrachloroethane and chlorine according to a molar ratio of (15-11): 1; s3, the mixed materials are introduced into a first tubular reactor, a first-stage cracking reaction is carried out under the radiation heating and convection heating composite heat supply condition, the reaction pressure is controlled to range from 0 KPa to 100 KPa, the reaction temperature is controlled to range from 380 DEG C to 450 DEG C, and an intermediate product containing trichloroethylene and tetrachloroethylene is generated. The contradiction that the conversion rate and the selectivity in a single-section reactor are difficult to collaboratively optimize is effectively overcome, and the total yield of a target product is greatly improved; by introducing a real-time online monitoring and feedback linkage regulation and control mechanism, accurate and flexible control of the generation proportion of tetrachloroethylene is realized, and the response capability of the process to the market demand is enhanced.

The present invention relates to a process for producing phosphorus-chloride compounds, characterized by the following steps: i. reacting a phosphorus-oxygen compound-containing material in the presence of tetrachloroethene at a temperature of 500 to 1000°C, and ii. removing and isolating the resulting phosphorus-chloride compound, particularly phosphorus oxychloride, from the exhaust gas stream.

The application discloses a refining method of ultraviolet absorber UV-3030, which aims at removing various organic solvents in the form of molecular adducts in UV-3030 products obtained through recrystallization, and making the melting point of the UV-3030 products reach 174-176 DEG C. The refining method of the ultraviolet absorber UV-3030 is realized according to the following method: the product (dry melting point 125-140 DEG C) obtained through recrystallization by using toluene, xylene, tetrachloroethylene, dichloromethane, ethyl acetate, methanol and other organic solvents or mixed solvents is suspended in carbon disulfide solution, heated to reflux for a certain time, filtered, dried, and then the refined product with the melting point of 174-176 DEG C is obtained, and the refining yield is greater than 95%. The refining method has the advantages of simple process, green environmental protection and low cost, and the obtained product has high purity and the melting point meets the product requirements.

The invention relates to a method for measuring the oil content in a wet-process copper smelting solution and recycling a solvent, and solves the problems of low detection efficiency of organic residues in the wet-process copper smelting solution, unstable result, high use cost of a detection reagent and the like in the prior art. Comprising the following steps: S1, extracting a solution to be detected for multiple times by taking tetrachloroethylene as an extracting agent, and combining organic phases; s2, drying the combined organic phase by anhydrous sodium sulfate, filtering, detecting the oil content by using an infrared oil content meter, and correcting the result through blank control; and S3, adsorbing and purifying the used tetrachloroethylene through activated carbon, and regenerating and recycling the tetrachloroethylene. According to the method, the content of the organic residues in the electrolyte and the extract liquor can be rapidly and accurately detected, and the test cost is greatly reduced through cyclic purification and use of the detection reagent.

A method for separating R22 and HFP includes a mixing step of obtaining a mixture for extraction which is a mixture of a first mixture including R22 and HFP and an extraction solvent including at least one chlorine-containing compound selected from the group consisting of methylene chloride, chloroform, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, pentachloroethane, hexachloroethane, trichloroethylene, and tetrachloroethylene, and an extraction distillation step of distilling the mixture for extraction to respectively obtain a first distillate including HFP as a main component, and a first bottom product including the extraction solvent as a main component and including R22.