279results about "Preparation by halogen replacement" patented technology

To provide a fluorinating agent that can be produced using a simple method, and a fluorination method that uses a fluorinating agent that can be produced using a simple method.SOLUTION: The present disclosure provides a fluorinating agent that comprises a fluorine-containing compound and fluoride ions.SELECTED DRAWING: None

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.

Systems and processes for preparing (Z)-1,1,1,4,4,4-hexafluoro-2-butene are provided. Compositions prepared according to one or more of the systems and processes described herein and methods of using the compositions are also provided.

Disclosed herein are fluoroolefin compositions, methods of producing the same, methods and systems using the same, and systems containing the HFO-1234ze compositions. The inventive compositions are useful as refrigerants in air conditioning and refrigeration systems, and also as blowing agents.

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 belongs to the field of fine chemical engineering, and discloses a method for synthesizing 2, 3-dimethyl-2-isopropyl butyronitrile, which comprises the following steps of: adding an organic amine solvent into a high-pressure reaction kettle, adding sodium amide, sodium iodide and a phase transfer catalyst into the reaction kettle under the protection of nitrogen and in a stirring state, stirring for a certain period of time, and reacting for 2-3 hours to obtain 2, 3-dimethyl-2-isopropyl butyronitrile. Dropwise adding a mixed solution of propionitrile and 2-bromopropane into the reactor, controlling the dropwise adding speed and the reaction temperature, continuously reacting for a period of time after the dropwise adding is finished to obtain a reactant solution, cooling the reactant solution, adding water, standing for layering, collecting an organic phase, distilling the organic phase at normal pressure to recover a solvent, and rectifying at reduced pressure to obtain 2, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3-pentanediol. According to the method, the sodium iodide, the phase transfer catalyst and the organic amine have a synergistic effect, so that the reaction time is shortened, and the yield of the product is improved.

The invention belongs to the technical field of octafluorocyclopentene gas preparation, and particularly relates to a catalytic synthesis method of octafluorocyclopentene. The method specifically comprises the following step: under the action of a fluorine-chlorine catalyst, carrying out gas-phase catalytic fluorination reaction on 1-chloroheptafluorocyclopentene and anhydrous hydrogen fluoride at 80-120 DEG C to obtain octafluorocyclopentene. The preparation method of the fluorine-chlorine catalyst comprises the following steps: dissolving metal chloride in water, adding a precipitant, and fully stirring for reaction to obtain slurry; filtering the slurry to remove filtrate to obtain a solid, and washing the solid with deionized water until the solid is neutral; adding aluminum nitrate into the washed solid, fully stirring and drying to obtain a precursor of the catalyst; and performing compression molding on the precursor of the catalyst, roasting, and activating to obtain the fluorine-chlorine catalyst. The method is mild in reaction condition and high in catalytic efficiency.

The present invention relates to the technical field of chemistry, particularly to a 2, 3, 3, 3-tetrafluoropropene preparation method, which comprises: mixing a water-soluble metal salt containing a first metal auxiliary agent and chromium chloride hexahydrate to prepare a first solution, mixing the first solution with first ammonia water, and carrying out first calcination treatment on the obtained first precipitate to obtain a first chromium salt; mixing first chromium salt with graphite and silicon dioxide to obtain a first catalyst precursor, and performing fluorination activation treatment on the first catalyst precursor to obtain a first catalyst; the method comprises the following steps: under the action of a first catalyst, reacting 2-chloro-3, 3, 3-trifluoropropene with hydrogen fluoride to obtain 2, 3, 3, 3-tetrafluoropropene. According to the method, the process route is shortened, the use of highly toxic substances is avoided, the cost is reduced, the pollution to the environment is reduced, and meanwhile, the conversion rate of HCFO-1233xf and the selectivity of HFO-1234yf are improved.

The invention relates to the technical field of preparation of hydrofluoroolefin, in particular to a method for preparing 2, 3, 3, 3-tetrafluoropropene, which comprises the following steps: carrying out fluorination reaction on 3, 3, 3-trifluoro-2-chloropropene and excessive hydrogen fluoride under the action of a catalyst to generate a first mixture flow containing 1, 1, 1, 2, 2-pentafluoropropane (245cb), and separating the first mixture flow from the first mixture flow to obtain the 2, 3, 3, 3, 3-tetrafluoropropene. Then directly introducing the first mixture flow into a dehydrofluorination reactor for gas phase dehydrofluorination reaction to generate a second mixture flow containing 2, 3, 3, 3-tetrafluoropropene, hydrogen fluoride and unreacted raw materials, finally condensing the second mixture to remove hydrogen chloride, condensing and recycling hydrogen fluoride to obtain a third mixture flow, and rectifying the third mixture flow to obtain 2, 3, 3, 3-tetrafluoropropene. And 3, 3, 3, 3-tetrafluoropropene. According to the invention, unavoidable process wastes in the prior art are converted into recyclable reaction raw materials, the environmental protection and economic pressure of by-product treatment in the prior art is eliminated, meanwhile, the purpose of continuous flow reaction is effectively realized, and the process control difficulty and the process cost are reduced.

The invention provides a K-Zn composite carbon-based catalyst, a preparation method thereof and application of the K-Zn composite carbon-based catalyst in synthesis of 1, 2-difluoroethylene, and belongs to the technical field of hydrofluoroolefin synthesis. The preparation method comprises the following steps: firstly synthesizing a zinc-based anionic metal organic framework material (Zn-MOFs), then performing ion exchange with sylvite, and performing activating treatment in HCl-containing gas to obtain the K-Zn composite carbon-based catalyst. According to the invention, Zn-MOFs is adopted as a catalyst precursor, dimethylamine cations in the structure of the Zn-MOFs are subjected to ion exchange with potassium ions, and activation treatment is carried out in HCl gas to obtain the high-performance surface chlorinated K-Zn composite carbon-based catalyst. According to the prepared K-Zn composite carbon-based catalyst, 1, 2-dichloroethylene and HF can be subjected to HF addition reaction and HCl removal reaction, the target product 1, 2-difluoroethylene can be prepared through one-step reaction, the technological process is greatly shortened, and the reaction efficiency is improved.

Systems and methods for the preparation of (Z)-1, 1, 1, 4, 4, 4-hexafluoro-2-butene are provided. Compositions prepared according to one or more of the systems and methods described herein and methods of using these compositions are also provided.

The invention relates to an improved process for the manufacture of a fluorinated organic compound, wherein the process comprises a fluorination reaction of an organic precursor compound having at least one chlorine substituent and / or at least one double bond, and said organic precursor compound is reacted in liquid phase in HF (hydrogen fluoride) serving as solvent and fluorinating agent in the presence of a fluorinating catalyst, and wherein the fluorination reaction is performed in liquid phase in a SiC block chemical reactor, and wherein the reaction mixture is withdrawn from SiC block chemical reactor, and wherein the process comprises optionally isolating and / or purifying the targeted fluorinated organic compound.

The application discloses a continuous production process and equipment for a trifluoromethylbenzene tower, and belongs to the field of organic fluorine chemistry. The production process comprises the following steps: S1: continuously feeding trichloromethylbenzene and hydrogen fluoride into a tower reactor connected with a heat exchanger circulating cooling system in a reverse direction, so that a three-stage continuous fluorination reaction occurs in the tower reactor to obtain crude trifluoromethylbenzene, and unreacted hydrogen fluoride is separated into liquid at the top of the tower and then flows back into the tower reactor; S2: the crude trifluoromethylbenzene obtained in the reaction is subjected to nitrogen bubbling in a bubble tower, and then is continuously distilled in a rectifying tower to obtain finished trifluoromethylbenzene; and S3: byproduct hydrogen chloride generated in the fluorination reaction is introduced into a hydrochloric acid tank to obtain hydrochloric acid, and the content of hydrofluoric acid in the hydrochloric acid is less than 1000 ppm. The method can greatly improve the utilization rate of raw material hydrogen fluoride, improve the purity of byproduct hydrochloric acid, reduce the generation amount of waste acid, avoid the sharp change of pressure in the reaction process, and realize large-scale, continuous, stable and safe production of trifluoromethylbenzene.

In one embodiment, a method for producing fluoroolefins includes coupling 3,3-dichloro-1,1,1,2,2-pentafluoropropane (CF3-CF2-CHCl2) in the presence of a catalyst in the liquid phase to form a composition comprising 1,1,1,2,2,5,5,6,6,6-decafluoro-3-hexene (CF3CF2CH=CHCF2CF3). In another embodiment, a method for producing fluoroolefins includes coupling 1,1,1-trichloropentafluoropropane (CF3-CF2-CCl3) in the presence of a first catalyst in the gas phase to form a composition comprising 3,4-dichloro-1,1,1,2,2,5,5,6,6,6-decafluoro-3-hexene (CF3-CF2-CCl=CCl-CF2-CF3). The method further includes coupling CF3CF2CH m Cl 3-m and chlorine (Cl2) to form CF3-CF2-CCl3. The method may further include hydrodechlorinating 3,4-dichloro-1,1,1,2,2,5,5,6,6,6-decafluoro-3-hexene with hydrogen (H2) in the presence of a second catalyst in the gas phase to form a composition comprising CF3CF2CH=CHCF2CF3 and 3-chloro-1,1,1,2,2,5,5,6,6,6-decafluoro-3-hexene (CF3CF2CCl=CHCF2CF3).

The present invention provides a method for the co-production of 1,1-difluoroethane and vinyl chloride, including: (a) vaporizing dichloroethane and hydrogen fluoride, and delivering the vaporized dichloroethane and hydrogen fluoride into a reactor for a catalytic reaction under the action of a catalyst to obtain a reaction product; (b) delivering the reaction product into a first rectifying tower for separation to obtain an overhead product from the first rectifying tower and a bottom product from the first rectifying tower; (c) delivering the overhead product from the first rectifying tower into a second rectifying tower for separation to obtain hydrogen chloride and a bottom product from the second rectifying tower; (d) delivering the bottom product from the second rectifying tower into a purifying tower for purification to obtain an overhead product from the purifying tower; (e) simultaneously delivering the overhead product from the purifying tower and a saturated organic solvent into a third rectifying tower for separation to obtain a 1,1-difluoroethane product and a bottom product from the third rectifying tower; and (f) delivering the bottom product from the third rectifying tower into a fourth rectifying tower for separation to obtain a vinyl chloride product and a bottom stream from the fourth rectifying tower. The present invention has the advantages of simple process, high conversion rate, and good product quality.

The invention provides a preparation method of dichlorohexafluorocyclopentene. Perhalogenated cyclopentene or / and perhalogenated cyclopentadiene is used as a raw material and reacts with HF and Cl2 in a tubular reactor filled with a catalyst to generate dichlorohexafluorocyclopentene, the catalyst needs to be used after being activated for 2-12 h in a mixed gas of HF and F2 at the temperature of 200-600 DEG C, and the catalyst is one or more of molybdenum fluoride, nickel fluoride, cobalt fluoride or molybdenum fluoride; the reaction conditions are as follows: the molar ratio of HF to Cl2 to octachlorocyclopentene or hexachlorocyclopentadiene is (4-10): (1-5): 1, the reaction temperature is 200-500 DEG C, the reaction pressure is 0-2.0 MPa, and the catalyst contact time is 5-90 seconds. According to the method, the reaction process is simple, the needed target object is prepared through one-step gas-phase catalytic fluorination, the method is suitable for large-scale production of dichlorohexafluorocyclopentene, the requirement for equipment is low, and the catalyst activity and stability are high.

The invention discloses a synthesis method of octafluorocyclopentene, which comprises the following steps: 1, carrying out gas phase catalytic fluorination reaction on octachlorocyclopentene and fluorine gas to obtain an intermediate 1, 2-dichlorohexafluorocyclopentene; and 2, by taking the obtained intermediate 1, 2-dichlorohexafluorocyclopentene and anhydrous potassium fluoride as raw materials and dimethyl sulfoxide as a solvent, carrying out high-temperature substitution reaction on the raw materials and potassium fluoride to generate octafluorocyclopentene. The first-step reaction and the second-step reaction are carried out through a circulating system, so that materials can be completely reacted and fully utilized, the pollution is greatly reduced, and the industrial continuous production of octafluorocyclopentene can be realized.

The invention relates to bio-based vinylidene difluoride. The invention also relates to processes for preparing bio-based vinylidene difluoride from various renewable raw materials. The invention further relates to vinylidene difluoride homopolymers obtained by polymerization of said monomer, as well as copolymers obtained by copolymerization of said monomer with one or more compatible co-monomers. Finally, the invention relates to the use of said homopolymers or copolymers in applications such as chemical engineering or electronics, particularly consumer electronic devices.

To provide compositions that meet low ozone depletion standards and have low global warming potentials.SOLUTION: The invention provides: a composition comprising 1,1,2,4,4-pentachlorobuta-1,3-diene, E-1,1,2,3,4-pentachlorobuta-1,3-diene, and Z-1,1,2,3,4-pentachlorobuta-1,3-diene; a process for producing 1,1,2,4,4-pentachlorobuta-1,3-diene; and a process for producing Z-1,1,1,4,4,4-hexafluorobut-2-ene.SELECTED DRAWING: None

The present invention discloses a method for preparing perfluorooctyl bromide by catalytic bromination of perfluorooctyl iodide. First, fluorosilicic acid reacts with aluminum hydroxide, and after filtering to remove silicon dioxide, a mixed solution of fluoroaluminate and fluorosilicic acid is obtained. Then, a soluble metal salt additive and graphite powder are added thereto. After coprecipitation, granulation, and sintering, metal oxide-doped aluminum-based catalyst particles are obtained, which are loaded into a fixed-bed reactor. After fluorination with an N2 / HF mixed gas, perfluorooctyl iodide and bromine are vaporized and mixed and then enter the fixed-bed reactor, and perfluorooctyl bromide is prepared by reaction. In the present invention, the reaction raw materials are easily available; the reaction conditions are mild, and materials and equipment matching the process can be found in the existing equipment and material system to support the long-term stable operation of production; through the efficient catalysis of the catalyst and the continuous progress of the reaction gas phase, the reaction efficiency is improved and the consumption of bromine is reduced, so that the whole process has good atom economy and has good application prospects.

A method for producing a hydrofluorocarbon (HFC) is provided, the method being excellent in terms of the conversion of a chlorofluorocarbon and reduced in the formation of by-products.　This method for producing an HFC comprises reacting a chlorofluorocarbon (1A) with hydrogen in the presence of a catalyst to produce a hydrofluorocarbon (2A) in which one or two of the chlorine atoms of the chlorofluorocarbon (1A) have each been replaced with a hydrogen atom, the reaction being conducted using a reactive mixture comprising the chlorofluorocarbon (1A), hydrogen, and hydrogen chloride and having a hydrogen chloride concentration of 100-10,000 mass ppm of the chlorofluorocarbon (1A).

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

The present application discloses a full-process continuous process for synthesizing 1,1,1,3,3-pentafluoropropane, including a telomerization reaction: vinyl chloride, carbon tetrachloride, catalyst 1 and a cocatalyst are added to a pre-reactor mixer for premixing to obtain mixture 1, mixture 1 is pumped into a reactor system for telomerization reaction to obtain the material of the telomerization reaction, the material of the telomerization reaction is continuously pumped out and separated to obtain R240fa, and the separated vinyl chloride, carbon tetrachloride, catalyst 1, cocatalyst and unseparated R240fa are returned to the pre-reactor mixer for continuous reaction; a fluorination reaction: the R240fa, chlorine gas and anhydrous hydrogen fluoride obtained from the telomerization reaction are continuously introduced into a fluorination reaction kettle containing activated catalyst 2 for fluorination reaction to obtain a fluorination reaction product, the fluorination reaction product is separated to obtain 1,1,1,3,3-pentafluoropropane, and the remaining product after separating 1,1,1,3,3-pentafluoropropane is returned to the fluorination reaction kettle for continuous reaction.

A method for producing a fluorine-containing aromatic compound, whereby a fluorine-containing aromatic compound such as perfluorotoluene can be efficiently produced by reacting a compound represented by general formula (2) with hydrogen fluoride, a base, and an acid other than hydrogen fluoride to fluorinate at least one or more X3 of-CX33 groups to produce a compound represented by general formula (1). (In the formula, n is the same as below. And X3 may be the same or different and each represents a hydrogen atom or a halogen atom. Wherein, in the-CX33 group, at least one of the three X3 atoms is a halogen atom other than a fluorine atom. And X4 may be the same or different and each represents a hydrogen atom or a halogen atom. ] # imgabs0 #

The invention provides a fluorination catalyst composition, a preparation method and application thereof, and a method for catalyzing 1, 1, 1, 3, 3-pentachloropropane to generate E-1-chloro-3, 3, 3-trifluoropropene, and belongs to the field of materials. The fluorination catalyst composition comprises a main catalyst and a third metal element loaded on the main catalyst, wherein the main catalyst is biomass charcoal simultaneously modified by a first metal element and a second metal element; wherein the first metal element comprises at least one of rare earth metal elements; the second metal element comprises at least one of Zr, Nb, Mo, V, Fe, Mn, Ti, Hf, Ga, In and Sn; the third metal element comprises at least one of Mg, Ca, Ba and Sr. The fluorination catalyst composition provided by the invention can efficiently catalyze 1, 1, 1, 3, 3-pentachloropropane to generate a gas phase fluorination reaction to generate E-1-chloro-3, 3, 3-trifluoropropene, has the advantages of high conversion rate, strong selectivity, long service life and the like, and is suitable for wide application.

Minimum-boiling, heterogeneous azeotropic and azeotrope-like compositions including 1,1,2,2,3-pentachloropropane (HCC-240aa) and hydrogen fluoride (HF), as well as methods for using these azeotropic or azeotrope-like compositions in the production of trifluorochloropropenes.

Methods of synthesis of intermediates, such as 2-chloro-1,1,1,4,4,4-hexafluoro-2-butene and 2,3-dichloro-1,1,1,4,4,4-hexafluoro-2-butene, which can be used in the production fluorinated olefins, such as 1,1,1,4,4,4-hexafluoro-2-butene, from hexafluorobutadiene, are provided.

This invention provides a composition that contains PFOB with a PFOA content lower than that of known PFOB, and that is less likely to have an adverse effect on the environment; and provides a method for producing PFOB. The composition contains C8F17Brand further contains C7F15COOH, wherein C7F15COOH is present in a concentration of 25 ppb or less based on the total weight of C8F17Br. The method for producing C8F17Br comprises reacting C8F17I and a brominating agent to obtain C8F17Br, and alkali-washing the obtained C8F17Br to reduce the C7F15COOH content to 25 ppb or less based on the total weight of C8F17Br.

A method for the production of (Z)-1,1,1,4,4,4-hexafluoro-2-butene (Z-1336mzz) is described, utilizing readily available halogenated starting materials, such as 1,1,1-trichloro-2,2,2-trifluoroethane (CFC-113a) and carbon tetrachloride.

A method of synthesizing 3,3,3-trifluoropropene including contacting 1,1,1,3-tetrachloropropane, in the vapor phase, at a temperature sufficient to effect dehydrochlorination to form 1,1,3-trichloro-1-propene. The 1,1,3-trichloro-1-propene is isolated and subsequently contacted, in the vapor phase, with hydrogen fluoride in the presence of a fluorination catalyst at a temperature sufficient to effect formation of 3,3,3-trifluoropropene.