788results about "Halogenated hydrocarbon separation/purification" patented technology

The invention discloses a p-methyl benzyl chloride production process and a production system thereof, p-xylene side chains and chlorine are subjected to a gas phase substitution reaction under micro negative pressure and visible light catalysis to generate crude methyl benzyl chloride and hydrogen chloride, and 99.0% methyl benzyl chloride, a small amount of benzyl dichloride and 31% hydrochloric acid are respectively generated through rectification and absorption; the device consists of four working sections of chlorination, rectification, hydrochloric acid absorption and distillation. According to the method, the defects in the prior art are overcome, on one hand, chlorine is introduced, and an aromatic ring chlorination reaction is carried out under visible light catalysis; on one hand, a supported catalyst filler is arranged at the bottom of a chlorination tower, and a zeolite molecular sieve modified by long-chain alkylsilane and supported by metal salt is used as a catalyst to catalyze chloromethylation reaction, on the other hand, the hydrophobicity of the modified catalyst is obviously enhanced, and meanwhile, the density of acidic sites is not reduced; the contact opportunity of the catalyst and a reaction substrate is greatly increased, and the catalytic efficiency of the catalyst is improved.

The invention discloses a catalytic synthesis method of 1, 1, 3, 3, 3-pentafluoropropylene, which comprises the following steps: (1) introducing a raw material 1, 1, 1, 3, 3, 3-hexafluoropropane into a reactor, and reacting under the action of a catalyst to obtain crude 1, 1, 3, 3, 3-pentafluoropropylene, the catalyst containing Cr2O3 and one of metal oxides of Al, Bi and Co; (2) carrying out water washing, alkali washing and drying on the crude 1, 1, 3, 3, 3-pentafluoropropene, and then introducing the crude 1, 1, 3, 3, 3-pentafluoropropene into a first rectifying tower for separation to obtain a mixture containing 1, 1, 1, 3, 3-pentafluoropropene and a small amount of by-products; and (3) introducing the mixture containing 1, 1, 1, 3, 3-pentafluoropropylene and a small amount of by-products into a second rectifying tower, and separating to obtain a 1, 1, 1, 3, 3-pentafluoropropylene product. The method has the advantages of simple process, high catalyst activity, low cost and environmental protection.

The invention provides an HCFC-22 production method with net zero emission of by-product HFC-23, a production process system integrates a conversion and utilization process system of the by-product HFC-23 in the HCFC-22 production process, the HCFC-22 production process is coupled with a conversion process of HFC-23 and CHCl3, the by-product HFC-23 generated in the HCFC-22 production process is directly converted into HCFC-22 and HCFC-21 in the system, and the HCFC-22 and CHCl3 are converted into HCFC-22 and CHCl3. Through further separation and purification and raw material index control, the HFC-23 conversion catalyst keeps good activity, selectivity and stability, HFC-23 generated in the HCFC-22 production process can be effectively converted, and zero emission of HFC-23 in a system is achieved. The method is simple in process, low in investment cost, low-carbon, environment-friendly, efficient in emission reduction and capable of realizing net zero emission of the byproduct HFC-23 of the HCFC-22 production system.

The invention discloses an o-methylbenzyl chloride production process which comprises the following steps: S1, a chlorination section: pumping o-xylene into an evaporation kettle, heating, vaporizing the o-xylene in the kettle, enabling the vaporized o-xylene to enter a chlorination tower, introducing chlorine gas into the chlorination tower, and carrying out a chlorination reaction on the chlorine gas and rising o-xylene gas under the catalysis of visible light, the generated o-methylbenzyl chloride and o-dichlorobenzyl are in a liquid state and flow back into the evaporation kettle, the material crude benzyl in the kettle is transferred into a rectifying kettle, and hydrogen chloride gas generated by the reaction enters a hydrogen chloride absorption section. The supporting table, the feeding conveying belt, the discharging conveying belt and the rotatable transfer plate in the product tank conveying mechanism are matched with one another to form an efficient conveying system, after being placed on the feeding conveying belt, a finished product tank to be filled can be rapidly conveyed to the positions of the supporting table and the transfer plate, and through rotation of the transfer plate, the finished product tank to be filled can be rapidly conveyed to the supporting table and the transfer plate. And the finished product tanks can be accurately transferred to all stations, so that the conveying efficiency is greatly improved, and the manual carrying time and labor intensity are reduced.

The method for producing a halogenated alkene converts a halogenated alkane having 2 to 4 carbon atoms and containing a fluorine atom into a halogenated alkene having 2 to 4 carbon atoms and containing a fluorine atom in the gas phase in the presence of silicon oxide and an alkali metal element.

A process for producing propylene and hydrogen from propane, the process comprising the steps of: a) reacting a mixture comprising propane and bromine to produce a first reaction mixture comprising bromopropane and hydrogen bromide, b) subjecting the first reaction mixture obtained in step a) to at least one separation step to obtain a bromopropane-rich composition and to obtain a hydrogen bromide-rich composition, c) subjecting the bromopropane-rich composition obtained in step b) to a catalytic reaction to produce a second reaction mixture containing propylene and hydrogen bromide, d) subjecting the second reaction mixture obtained in step c) to at least one separation step to obtain a hydrogen bromide-rich composition and to obtain propylene, and e) subjecting the hydrogen bromide-rich composition obtained in step b) and / or the hydrogen bromide-rich composition obtained in step d) to electrolysis to obtain hydrogen and a bromine-containing composition, wherein preferably at least a portion of the bromine-containing composition is recycled back to step a).

The invention relates to a dichloromethane separation technology, in particular to a dichloromethane separation system capable of replacing centrifugal washing based on a PC project, which comprises a dichloromethane separator, a high-efficiency coalescer and a pre-filtering assembly, the pre-filtering assembly comprises a main filtering tank, an auxiliary filtering tank, a main separation channel arranged on the main filtering tank, an auxiliary separation channel arranged on the auxiliary filtering tank and filters arranged in the main filtering tank and the auxiliary filtering tank; a channel conversion assembly and a driving assembly are installed on the pre-filtering assembly, the input end of the channel conversion assembly is connected with the output end of the driving assembly, and the channel conversion assembly is used for controlling opening or closing of the main separation channel and the auxiliary separation channel; the channel switching assembly and the driving assembly are matched to synchronously open and close the main separation channel and the auxiliary separation channel on the pre-filtering assembly, a pure mechanical transmission structure is adopted, switching use is more convenient, operation is more stable, and damage is not likely to happen.

The invention discloses a resourceful treatment method for mother liquor in a glycine production process. The method comprises the following steps: introducing hydrogen chloride gas into mother liquor in a glycine production process to obtain hydrolysate; centrifugally separating the hydrolysate to obtain an ammonium chloride product, and treating the primary centrifugal filtrate in the next process; adding urea into the centrifugal filtrate for reaction, and after the reaction is completed, carrying out centrifugal separation to obtain a solid product urea-formaldehyde resin and a secondary centrifugal filtrate; the secondary centrifugal filtrate is heated, methyl alcohol in the filtrate is removed, methyl chloride is recycled, then heating continues, water in the filtrate is removed, evaporation condensate water is obtained, methyl chloride can be collected to serve as a by-product to be sold, the evaporation condensate water is reused for glycine production, and evaporation residual liquid serves as organic matter fertilizer to be treated. Under the condition of low energy consumption, impurities such as urotropin, ammonium chloride and methanol ammonia in the glycine mother liquor are separated, and resources such as urotropin, ammonium chloride and methanol in the mother liquor are recycled.

The invention discloses a high-purity fluorobenzene recovery process in 1, 4-bis (4-fluorobenzoyl) benzene production, and belongs to the technical field of organic waste liquid recovery, the process comprises the following steps: 1, enabling fluorobenzene waste liquid to pass through a tubular reactor filled with anhydrous aluminum chloride particles to react to obtain dewatered fluorobenzene waste liquid, the reaction temperature is 5-40 DEG C, the retention time is 60-200min, and the flow velocity of the fluorobenzene waste liquid is 0.1-0.4 m / min; 2, the water-removed fluorobenzene waste liquid is filtered through a micron filter and then enters a fluorobenzene rectifying tower to be rectified, organic steam on the tower top is compressed through a compressor, subjected to heat exchange through an MVR heat exchanger and condensed and then enters a reflux tank to be refluxed, high-purity fluorobenzene is extracted from the fluorobenzene rectifying tower, the purity of the fluorobenzene is larger than 99.99 wt%, and the mass content of water is smaller than 10 ppm. The fluorobenzene waste liquid in the production process of 1, 4-bis (4-fluorobenzoyl) benzene is used as a raw material, continuous batch production of high-purity fluorobenzene is achieved through reaction dehydration, crystalline aluminum chloride filtration and rectification, the process is simple, and energy consumption is low.

The invention discloses a method for preparing 1, 2, 3-trichloropropene with high selectivity by dehydrochlorination of 1, 2, 2, 3-tetrachloropropane, and belongs to the technical field of catalysis. The method comprises the following steps: stirring 1, 2, 2, 3-tetrachloropropane and a sodium hydroxide solution under the conditions of normal pressure and 40-100 DEG C for reflux reaction, after the reaction is finished, cooling the reaction liquid to room temperature, separating the liquid by using a separating funnel, rectifying the obtained oil phase to obtain 1, 2, 3-trichloropropene, adding an improver into the reaction system, and carrying out solid-liquid separation to obtain the 1, 2, 3-trichloropropene. The improver is a complex system composed of a metal salt and a bidentate phosphine ligand or a metal composite oxide. The method provided by the invention has the advantages of fewer reaction steps and simpler equipment, the yield of 1, 2, 3-trichloropropene is as high as 86%, the conversion rate of 1, 2, 2, 3-tetrachloropropane is as high as 92%, the selectivity of the target product is as high as 98%, and the conversion rate and the selectivity of the target product are remarkably improved.

The invention belongs to the technical field of hexafluoroethane purification, and particularly relates to a purification process and a purification device of electronic-grade hexafluoroethane. The purification process of the electronic-grade hexafluoroethane comprises the following steps: introducing a hexafluoroethane crude product into a preprocessor, and carrying out pretreatment; introducing the crude product treated by the pretreater into an adsorption tower for adsorption; introducing the adsorbed crude product into a condenser to remove non-condensable gas so as to obtain crude product condensate, and introducing the crude product condensate into an alkali washing tank for alkali washing; and the alkali-washed crude product sequentially enters a degassing tower and a rectifying tower, and is degassed and rectified to obtain the electronic-grade hexafluoroethane product. According to the purification process of the electronic-grade hexafluoroethane, the pretreatment agent and the adsorbent are designed, so that the purity of the hexafluoroethane reaches 99.999%, the conversion of pentafluoromonochloroethane and the removal of trifluoromethane are realized, the process is simple, and the energy consumption is low; the invention also provides a purification device corresponding to the purification process of the electronic-grade hexafluoroethane.

The invention provides continuous production equipment and a production method of 3, 4, 5-trifluorobromobenzene, the continuous production equipment comprises a continuous feeding device, the continuous feeding device is used for continuously supplying a first reaction raw material and a second reaction raw material, the first reaction raw material is o-dichlorobenzene, and the second reaction raw material is chlorosulfonic acid; an inlet of the continuous sulfonation reaction tank is communicated with an outlet of the continuous feeding device, and the continuous sulfonation reaction tank is used for providing a reaction place for a continuous sulfonation reaction of the first reaction raw material and the second reaction raw material so as to obtain a continuous sulfonation product; an inlet of the continuous post-treatment device is communicated with an outlet of the continuous sulfonation reaction tank, so that continuous post-treatment is performed on the continuous sulfonation product, 3, 4, 5-trifluorobromobenzene is obtained, and the problems caused by batch reaction in the prior art are solved.

The invention relates to a method for separating octafluoropropane and hexafluoropropane, which comprises the following steps: carrying out adsorption separation on a mixed gas containing hexafluoropropane and octafluoropropane by using an adsorbent containing a metal organic framework material, the metal organic framework material comprises metal ions and an organic ligand, and the organic ligand comprises a compound as shown in formula I; the metal ions are selected from one or more of transition metal ions and alkaline earth metal ions. The metal organic framework material has good material stability, the synthesis conditions are mild and simple, and the raw materials are low in price. The metal organic framework material provided by the invention has very high adsorption separation selectivity on hexafluoropropylene and octafluoropropane, and has a good industrial application prospect. # imgabs0 #

There is provided a method for storing fluoroalkene in which, even when stabilizers for suppressing reactions of fluoroalkene are not added, the reactions of the fluoroalkene hardly occur and the purity of the fluoroalkene hardly decreases during storage. Fluoroalkene having a bromine atom or an iodine atom in the molecule is at least one type of fluoroethylene represented by a first general formula C2HpFqXr and fluoropropene represented by a second general formula C3HsFtXu (X represents a bromine atom or an iodine atom), and contains or does not contain at least one type among manganese, cobalt, nickel, and silicon as metal impurities. When any of the foregoing is contained, the fluoroalkene is stored in a container with the total concentration of the manganese, the cobalt, the nickel, and the silicon set to 1000 ppb by mass or less.

The utility model provides a system for producing vinyl chloride through oxychlorination, and belongs to the field of vinyl chloride synthesis. According to the system for producing vinyl chloride through oxychlorination, dichloroethane is prepared through the oxychlorination reaction unit, then the dichloroethane is refined through the refining unit, then the refined dichloroethane is cracked in the cracking unit to prepare vinyl chloride, and finally the vinyl chloride is obtained through purification in the vinyl chloride refining unit. Dichloroethane is prepared through a direct chlorination reaction unit, so that the yield of dichloroethane is increased, and a raw material is provided for cracking of dichloroethane; according to the system for producing vinyl chloride through oxychlorination, dichloroethane is prepared through the oxychlorination reaction unit and the direct chlorination unit, so that the working efficiency of the system is improved.

The invention belongs to the technical field of azeotropic distillation and dehydration of isopropanol, particularly relates to an azeotropic distillation and dehydration method of industrial-grade isopropanol, and aims to solve the problems that the energy consumption of separation of isopropanol and solvents is high, the energy consumption is low and the like due to the fact that solvents such as benzene and cyclohexane are adopted for azeotropic distillation and dehydration in the conventional isopropanol dehydration process, but the boiling points of benzene and cyclohexane are close to those of isopropanol. In order to solve the problems that when diethyl ether is used as an azeotropic agent, the solvent is easily enriched at the tower top to form potential safety hazards, and when the solvents are used for azeotropic distillation, the requirements of electronic chemicals cannot be met, the following scheme is provided: the method comprises the following steps: S1, adding an industrial-grade isopropanol raw material into an azeotropic distillation tower; the azeotropic dehydrating agent disclosed by the invention is small in boiling point, high in ignition point, non-corrosive, low in price, good in safety and low in separation energy consumption, and has excellent application value and application prospect in industrial production and experiments, the used device is simple and easy to operate, the yield is high, and automatic production can be realized.

The invention discloses a process for continuously producing chloroethane by using byproduct hydrogen chloride, which belongs to the field of chloroethane production, and comprises the following steps: (1) catalytic reaction: fully mixing hydrogen chloride and ethylene, and feeding the mixture into a reactor for reaction to generate a gas phase and a liquid phase; (2) multi-stage condensation: after the gas phase of the reactor is subjected to first-stage circulating water cooling condensation and second-stage refrigerant cooling, most of chloroethane is cooled to a crude product tank, and a small amount of residual chloroethane and hydrogen chloride enter the reactor through a compressor; and (3) recycling hydrogen chloride: a gas phase obtained by secondary condensation mainly comprises hydrogen chloride, and is recycled to the bottom of the reactor for continuous reaction after being pressurized by a compressor, the process flow is simple, the purity of chloroethane is high, the production consumption is low, and recycling and continuous production of chloroethane are realized.

The invention relates to a preparation process of a fluorination liquid, in particular to a preparation method and device of perfluorohexane, and the preparation method comprises the following steps: mixing hexafluoropropylene and fluorine-containing gas for reaction to obtain crude perfluorohexane; the method comprises the following steps of: performing primary alkali washing and secondary alkali washing on a crude product of perfluorohexane, removing moisture, and finally performing primary condensation and secondary condensation to obtain the product of perfluorohexane by primary condensation and recover hexafluoropropylene for circular reaction by secondary condensation. The preparation device comprises a reaction tower, a buffer tank, a primary alkaline washing tower, a secondary alkaline washing tower, a drying tower, a first cold trap and a second cold trap which are communicated in sequence. The method is simple in production process, high in hexafluoropropylene conversion rate, high in product purity and low in comprehensive cost, and has good economic benefits and application prospects.

The present invention provides a vinyl chloride monomer efficient water removal device and a method for efficient water removal thereof. In the vinyl chloride monomer efficient water removal device, a coalescing filter element made of polyphenylene sulfide or fluoropolymer is installed in a coalescer, which not only has a stable and reliable water removal effect, but also is effective even when there is a surfactant in the vinyl chloride monomer and the interfacial tension is lower than 3 dyne / cm. The device also has a large coalescing treatment capacity, a small number of coalescing filter elements, a small size of the coalescer, and small equipment investment and operating costs. Furthermore, the vinyl chloride monomer efficient water removal device of the present invention adopts an integrated skid-mounted design, has a high degree of integration, saves space, and is easy to transport and install.

The invention provides a method for preparing p-chloromethyl styrene, which comprises the following steps: (1) in the presence of a catalyst and an assistant, carrying out reaction on paraformaldehyde and hydrogen chloride to obtain a chloromethylation reagent; (2) reacting beta-halogenated ethyl benzene with the chloromethylation reagent obtained in the step (1) to obtain chloromethyl halogenated ethyl benzene; (3) adding an extracting agent into the chloromethyl halogenated ethylbenzene reaction liquid obtained in the step (2) for extraction to obtain an oil layer containing chloromethyl halogenated ethylbenzene and a water-containing acid layer, and crystallizing the oil layer to obtain purified p-chloromethyl halogenated ethylbenzene; and (4) in the presence of a solvent, carrying out elimination reaction on the purified p-chloromethyl halogenated ethyl benzene and alkali to obtain p-chloromethyl styrene.

Disclosed in the present invention is a method for producing 2,3,3,3-tetrafluoropropene from 1,1,2,3,3,3-hexafluoropropene, comprising: (a) introducing 1,1,2,3,3,3-hexafluoropropene and hydrogen into a first reactor for a catalytic reaction to obtain a first reaction product; (b) separating the first reaction product to obtain 1,1,1,2,3,3-hexafluoropropane; (c) introducing 1,1,1,2,3,3-hexafluoropropane into a second reactor for a catalytic reaction to obtain a second reaction product; (d) separating the second reaction product to obtain 1,2,3,3,3-pentafluoropropene; (e) introducing 1,2,3,3,3-pentafluoropropene and hydrogen into a third reactor for a catalytic reaction to obtain a third reaction product; (f) separating the third reaction product to obtain 1,1,1,2,3-pentafluoropropane; (g) introducing 1,1,1,2,3-pentafluoropropane into a fourth reactor for a catalytic reaction to obtain a fourth reaction product; and (h) separating the fourth reaction product to obtain a final product of 2,3,3,3-tetrafluoropropene. The present invention has the advantages of being simple in process, low in cost, high in efficiency, green, and environmentally friendly.

The invention discloses continuous synthesis equipment for high-purity tetrachloroethylene. The continuous synthesis equipment comprises a chlorination synthesis device, an energy-saving device, a cooling and washing device, a carbon tetrachloride refining device and a tetrachloroethylene refining device. The invention further discloses a continuous synthesis process of the high-purity tetrachloroethylene. The continuous synthesis process comprises the steps of chlorination synthesis, cooling and washing, carbon tetrachloride refining and tetrachloroethylene refining. The reaction in the tube nest of the chlorination reaction kettle generates carbon tetrachloride, the carbon tetrachloride in the shell pass reacts to generate tetrachloroethylene, and the heat released by the first-step reaction promotes the forward proceeding of the second-step reaction. The heat-conducting oil is used for removing heat after reaction and supplying the heat to the rectification system, so that the energy consumption of the system is reduced. According to the invention, the carbon tetrachloride crude product is refined and then returns to the system, the tetrachloroethylene yield is high, and the conversion rate of tetrachloroethylene in the synthesis kettle is not influenced. The heat transfer oil is used for heating the rectification system and a tetrachloroethylene high-low pressure rectification mode, and the energy of the system is saved by more than 50%.

The invention belongs to the field of medicines, and discloses a continuous rectification process and equipment for brominated alkane. The continuous rectification equipment for brominated alkane comprises an extraction device and a rectification device, and the extraction device comprises a hydrobromic acid extraction tower, a water washing extraction tower and an alkali washing extraction tower; the rectification device is double-tower rectification equipment and comprises a light component removal tower and a refining tower; or the rectification device is single-tower separation equipment and comprises a refining tower. The invention also discloses a continuous rectification process for brominated alkane, which comprises the following steps of: performing three-stage extraction and refining to obtain a brominated alkane product. (1) compared with the traditional process, the brominated alkane rectification process adopts a combined process of three-stage extraction and two-stage refining to recover alcohol substances, the treatment capacity is large, the purity of a brominated alkane product can reach the medicine field, and the product yield is higher; according to the method, water in brominated alkane is effectively removed by adopting extraction standing oil-water separation and azeotropic light component removal, drying is not needed, and no solid waste is generated in the system.

The invention belongs to the technical field of brominated flame retardant synthesis, and particularly provides a decabromodiphenyl ethane bromine distillation process chlorination bromine removal process, which comprises the following steps: S1, adding bromine into a reaction kettle, adding a catalyst, and mixing; cooling and dropwise adding molten diphenylethane; then heating, carrying out a heat preservation reaction, and cooling to obtain a brominated crude product; s2, S201, adding the brominated crude product obtained in S1 into a bromine steaming kettle, and heating; s202, chlorine is introduced, and the total amount of bromine and chlorine is detected; carrying out segmented control on the introduced chlorine according to the total amount of bromine and chlorine; s203, when the total amount of bromine and chlorine is reduced to a threshold value, stopping introducing chlorine, standing, cooling, and introducing nitrogen; s3, filtering the feed liquid in the bromine steaming kettle, washing and purifying for three times, and finally, centrifugally dewatering to obtain a faint yellow solid; and S4, adding the faint yellow solid into a high-temperature jet mill, performing high-temperature aging to obtain white powder, and then performing jet milling on the white powder to obtain a finished product. Physical distillation is replaced by chemical replacement, so that bromine is highly separated.

The invention relates to a method for purifying a photoacid generator for photoresist, which comprises the following steps: adding an alcohol solvent into the photoacid generator, stirring and dissolving, then adding bismuth salt, and continuously stirring; filtering, concentrating filtrate, adding an organic solvent for dissolving, and then adding an adsorbent for adsorbing; the method comprises the following steps: filtering, concentrating a filtrate, dissolving with an alcohol solvent, adding into an aqueous solution containing a chelating agent, reacting, separating out a solid, filtering, washing a filter cake, and drying to obtain the purified photoacid generator, so that the removal of tungsten ions in the photoacid generator is realized, the concentration of tungsten in the purified photoacid generator is less than 5ppb through detection, and the yield of tungsten ions in the photoacid generator is more than or equal to 90%. And the product can be qualified and applied to the next section.

To provide a composition for heat transfer fluid as a novel mixture.SOLUTION: The present invention provides a composition for heat transfer fluid containing a hexafluoropropene trimer represented by C9F18, (i) CmF2m and / or CnF(2n-2) (in the formula, m is an integer from 4 to 12 other than 9. n is an integer from 4 to 12), (ii) water (the content of water is 0.0001-0.1 pt.mass relative to 100 pts.mass of the total amount of the hexafluoropropene trimer represented by C9F18), and / or (iii) fluoride ions (the content of the fluoride ions is 0.0000001 to 5 pts.mass relative to 100 pts.mass of the total amount of the hexafluoropropene trimer represented by C9F18).SELECTED DRAWING: None

The invention belongs to the field of chemical production, and particularly relates to a chloromethane cooling recovery system and a chloromethane cooling recovery method. The chloromethane cooling recovery system provided by the invention comprises a first condenser, a second condenser, a third condenser and a recovered chloromethane storage tank, a shell pass inlet of the second condenser is connected with a tube pass outlet of the third condenser, and a tube pass inlet of the third condenser is used for introducing liquid chloromethane. Chloromethane is cooled and recovered by using a liquid chloromethane vaporization heat absorption principle, so that the economical efficiency is good; in addition, due to the fact that the to-be-cooled object and the refrigerant are both methyl chloride, even if mutual leakage occurs in the heat exchange process, the quality of recycled methyl chloride cannot be affected, and raw material losses cannot be caused.

Belonging to the technical field of fine chemical product separation and purification, the invention discloses a beta-bromophenylethane rectification purification process, which comprises the steps of system negative pressure pretreatment, falling film evaporation directional separation, structured packing layer gas-liquid mass transfer, precise reflux ratio regulation and control, segmented collection (front fraction-qualified product), and residual liquid treatment and system circulation. According to the process, the negative pressure of a system is stabilized at 800-1200 Pa, the material temperature of a falling film evaporation discharging end is controlled at 125-135 DEG C, the feeding flow is stabilized at 1.8-2.2 m / h, the reflux ratio is regulated and controlled at 0.8: 1-1.2: 1, and the process realizes efficient purification of beta-bromopheny ethane through precise negative pressure control, synergistic linkage of falling film evaporation and a rectifying tower, segmented material collection and a circular treatment mechanism, so that the process is suitable for industrial production of beta-bromopheny ethane. According to the method, the purity of beta-bromopheny ethane can stably reach 99.5% or above, the material recovery rate is increased to 92% or above, energy consumption is reduced by 15-20% compared with that of a traditional process, material thermal decomposition loss is avoided, and the method is suitable for industrial large-scale production.

The invention discloses a green synthesis method of a high-purity hexafluoropropylene tripolymer, and relates to the technical field of hexafluoropropylene tripolymer preparation. The preparation method comprises the following specific steps: adding a hexafluoropropylene monomer into a reaction kettle, cooling the reaction kettle to a reaction temperature, slowly adding a high-activity catalyst, simultaneously starting stirring, and maintaining the reaction temperature and pressure; after the reaction time is up, cooling the reaction system, terminating the reaction, filtering and recovering the high-activity catalyst, and carrying out vacuum distillation to separate unreacted hexafluoropropylene monomers and byproducts, so as to obtain a hexafluoropropylene tripolymer crude product; and further purifying the hexafluoropropylene tripolymer crude product through column chromatography to obtain the high-purity hexafluoropropylene tripolymer. Due to the special structure and functional groups of the catalyst, the selectivity of a reaction product and the conversion rate of raw materials can be improved, and the high-purity hexafluoropropylene tripolymer can be prepared.

The invention discloses a resource utilization method of 1, 1, 2-trichloroethane waste liquid, which comprises the following steps: 1) feeding the 1, 1, 2-trichloroethane waste liquid into a scraper device to remove heavy components, and extracting gas-phase light components from the top; (2) condensing the gas-phase light component, feeding into a chlorination reactor, and carrying out chlorination reaction; and 3) carrying out reactive distillation on the material at the outlet of the chlorination reactor to remove light components and heavy components to obtain 1, 1, 2-trichloroethane. According to the method, on one hand, impurities which influence the purity of 1, 1, 2-trichloroethane and are difficult to separate react with chlorine under specific conditions to generate heavier components, and on the other hand, it is ensured that light components cannot be chlorinated into the impurities which are difficult to separate, and 1, 1, 2-trichloroethane with the purity being 99% or above can be recycled; on the other hand, 5-20 wt% of 1, 1, 2-trichloroethane is additionally generated in the reactive distillation process, waste liquid recycling is achieved, and the method has the advantages of being simple in technological process, low in energy consumption and high in product yield.