209results about "Preparation by dehalogenation" patented technology

Disclosed in the present invention is a method for co-producing 3,3,3-trifluoropropene and 2,3,3,3-tetrafluoropropene. The method comprises: introducing 1,1,1,3-tetrachloropropane, 1,1,1,2,3-pentachloropropane, and hydrogen fluoride into a first reactor, and reacting under the action of a first catalyst to obtain a first reactor reaction product; performing rectification on the first reactor reaction product to obtain a 3,3,3-trifluoropropene product and a tower kettle product, mixing the tower kettle product with hydrogen fluoride, and then introducing the mixture into a second reactor, and reacting under the action of a second catalyst to obtain a second reactor reaction product; and separating the second reactor reaction product from hydrogen chloride, water washing, alkaline washing, and drying to obtain a 2,3,3,3-tetrafluoropropene product. The present invention has the advantages of simple process, high efficiency, flexible operation, low investment, and low energy consumption.

The invention relates to the technical field of organic chemical synthesis, and particularly discloses a method for producing hexafluorobutadiene, a continuous production system and application thereof. The method for producing hexafluorobutadiene comprises the following steps: (1) bromination reaction: reacting tetrafluoroethylene with liquid bromine to generate dibromotetrafluoroethane; (2) telomerization reaction: reacting the dibromo tetrafluoroethane with tetrafluoroethylene under the action of a catalyst to generate dibromo octafluorobutane; the catalyst is cuprous bromide; and (3) elimination reaction: reacting the dibromo octafluorobutane under the action of a Grignard reagent to generate hexafluorobutadiene. The method provided by the invention has the advantages of simple process, easily available raw materials, high production efficiency, continuous production, low production cost and industrial mass production value.

The invention provides chlorotrifluoroethylene continuously prepared based on a microchannel reactor and a preparation method of the chlorotrifluoroethylene, and the chlorotrifluoroethylene comprises the following raw materials in parts by weight: 1, 1, 2-trifluoro-1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 The low-temperature refrigerant refrigerant is prepared from the following components in parts by weight: 90 to 100 parts of 1, 2-trichloroethane, 1 to 5 parts of a zinc fluoride induced palladium-copper bimetallic catalyst, 8 to 15 parts of a cyclohexyl dimethyl ether-formic acid composite hydrogen donor, 0.5 to 2 parts of trifluoroacetic anhydride, 0.1 to 0.5 part of a perfluoropolyether lubricant, a proper amount of a low-temperature mixed refrigerant and 15 to 20 percent by weight of diluted hydrochloric acid. According to the invention, the preparation efficiency and product purity of chlorotrifluoroethylene can be improved, and stable operation of the preparation system and reasonable treatment of byproducts can be guaranteed.

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 relates to a chlorinated organic compound selective hydrodechlorination catalyst and a preparation method thereof. The invention provides a catalyst for selective hydrodechlorination of chlorinated organic compounds, the catalyst comprises a first metal component and a second metal component which are loaded on a carrier, the carrier is treated by organic acid, the first metal component is selected from one or more of Pt, Pd, Rh, Ru, Ir, Au and Ag, and the second metal component is selected from one or more of Mn, Ti, V, Fe, Co, Ni, Cu and Zn.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a preparation method of perfluorohexyl octane. The preparation method comprises the following steps: by taking perfluorohexyl ethyl iodide as a raw material, firstly carrying out Grignard reagent exchange with a reagent A, and then carrying out nucleophilic addition reaction with n-hexanal to obtain a compound III; carrying out esterification and substitution on the compound III to prepare a compound V, or carrying out an Apple substitution reaction to prepare the compound V; and carrying out reduction reaction on the compound V, rectifying and purifying to obtain a target product. The reagent A comprises an isopropyl magnesium chloride tetrahydrofuran solution, a methyl magnesium chloride tetrahydrofuran solution, a methyl magnesium bromide tetrahydrofuran solution, an ethyl magnesium chloride tetrahydrofuran solution, an ethyl magnesium bromide tetrahydrofuran solution and / or a phenyl magnesium bromide tetrahydrofuran solution. According to the method, the perfluorohexyl ethyl iodide and the n-hexanal are used as raw materials to prepare the perfluorohexyl octane, isomer impurities are fundamentally avoided, and the method has the advantages that purification is easy, the yield is high, the product purity is high, and industrial production is facilitated.

The invention belongs to the technical field of fluorine chemical industry, and relates to preparation and application of a hydrodechlorination catalyst, a preparation method comprises the following steps: dipping a palladium source and a copper source on an activated carbon carrier, drying, and sequentially carrying out heating pretreatment in an inert atmosphere, reduction treatment in a hydrogen atmosphere and passivation treatment in an air atmosphere; in the obtained catalyst, the loading capacity of palladium on the activated carbon carrier is 0.5-0.1 wt%, and the loading capacity of copper on the activated carbon carrier is 5-0.1 wt%. Compared with the prior art, the preparation method has the advantages of low metal loading capacity, low reaction temperature, controllable product selectivity and the like, and the granular active carbon is adopted, so that the influence of active carbon extrusion molding and molding auxiliaries on preparation and performance of the catalyst can be avoided. Meanwhile, the catalyst can be used for the hydrodechlorination reaction of CFC-113, the problems of fast deactivation, poor stability and high use cost of the conventional catalyst can be solved, and an effective way is provided for converting fluorochloroalkane into fluorine-containing olefin.

The present invention discloses a gas-phase preparation method of 1,1,1,4,4,4-hexafluoro-2-butyne. Using a mixture of 2,3-dichloro-1,1,1,4,4,4-hexafluoro-2-butene and hydrogen as raw materials, under the action of a particulate catalyst, 1,1,1,4,4,4-hexafluoro-2-butyne is obtained through a one-step hydrodechlorination reaction. The catalyst includes a carbon carrier and an active phase in the form of hollow spheres supported on the carbon carrier. The active phase includes: a first metal selected from at least one of silver, copper, nickel, and cobalt; and a second metal selected from at least one of palladium, platinum, and rhodium. The present invention has the advantages of high product selectivity, high catalytic activity, obtaining the reaction product through a one-step reaction, and being suitable for industrial application, etc.

The present invention relates to a process for producing trifluoroethylene in a reactor having a fixed catalyst bed comprising a catalyst, the process comprising the steps of: a) reacting chlorotrifluoroethylene with hydrogen in an aqueous phase in the presence of a catalyst to produce a stream A comprising trifluoroethylene; b) treating said stream A under conditions sufficient to produce a stream D1 comprising 1,1,2-trifluoroethane with a content of less than 15% by weight, based on the total weight of stream D1; and c) recycling stream D1 to step a).

The invention provides a reactor comprising a reaction chamber having a catalytic surface in contact with reactants in said chamber; and a source for passing electrical current through said catalytic surface. The reactor can be used for dehydrohalogentation reactions, such as dehydrochlorination of HCFC-244bb to HFO-1234yf, and for reactions where zero valent metals are employed for catalysis. The invention further provides a process to prepare HFO-1234yf from HCFC-244bb using an electrically heated reaction chamber.

The production of HFO-1132, and in particular HFO-1132 E, may be produced from 1, 1, 2-trichloro-1, 2, 2-trifluoroethane (CFC-113), and the production of HFO-1132, and in particular HFO-1132 E, may be produced from 1, 1, 2-trichloro-1, 2, 2- In a first step, 1, 1, 2-trifluoroethane (HFC-143) is produced by hydrogenating 1, 1, 2-trichloro-1, 2, 2-trifluoroethane (CFC-113) by reacting with hydrogen in the presence of a catalyst to produce 1, 1, 2-trifluoroethane (HFC-143). The 1, 1, 2-trifluoroethane (HFC-143) may then be dehydrofluorinated in the presence of a catalyst to produce trans-1, 2-difluoroethylene (HFO-1132E) and / or cis-1, 2-difluoroethylene (HFO-1132Z). The cis-1, 2-difluoroethylene (HFO-1132Z) may then be isomerized to produce the trans-1, 2-difluoroethylene (HFO-1132E), and then the cis-1, 2-difluoroethylene (HFO-1132Z) may be isomerized to produce the cis-1, 2

The application relates to the field of organic synthetic chemistry, in particular to a diamino diphosphine tetradentate ligand, a preparation method thereof and application of the diamino diphosphine tetradentate ligand in Suzuki cross-coupling reaction. The diamino diphosphine tetradentate ligand provided by the application has a structure shown in formula I; due to special spatial structure and electronic properties, the diamino diphosphine tetradentate ligand can provide multi-point coordination to metal and form a stable complex with the metal, so that the activity and stability of a palladium catalyst can be improved, the palladium catalyst can efficiently catalyze the Suzuki cross-coupling reaction for constructing a C-C bond at an extremely low dosage, and the diamino diphosphine tetradentate ligand and the metal palladium catalyst have strong universality to Suzuki cross-coupling reaction substrates, and have wide potential application value.

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 invention relates to a method for preparing an aryl compound by taking ethanol as a green reducing agent and a solvent. According to the method, under the condition of a palladium catalyst, fluoro-aromatic hydrocarbon is mixed with alkali and alcohol to be subjected to a defluorination hydrogenation reaction, and the alcohol comprises ethanol and / or isobutanol. In the reaction, ethanol and / or isobutanol serve as a solvent and a reducing agent at the same time, no extra reducing agent needs to be added, and use of dangerous reducing agents such as hydrogen and lithium aluminum hydride is avoided. The catalyst system is excellent in substrate applicability and can be well compatible with common electron donating groups, electron withdrawing groups and heterocyclic rings, and the highest yield can reach 99%. In addition, the reaction system can be carried out in analytically pure ethanol and air, complicated anaerobic operation is not needed, and large-scale industrial application is facilitated.

An azeotrope or azeotrope-like composition consists essentially of an effective amount of 1-chloro-1, 1-difluoroethane (HCFC-142b) and 1, 1, 2-trifluoroethane (HFC-143), and a method for producing the azeotrope or azeotrope-like composition. Also disclosed are methods for separating azeotrope or azeotrope-like compositions and / or utilizing the same in extraction and pressure swing distillation in conjunction with methods of making 1, 1, 2-trifluoroethane (HFC-143).

The invention discloses a preparation process of an R-1234yf refrigerant based on a heterogeneous catalyst, and relates to the field of preparation of refrigerants. According to the method, tetrafluoroethylene and trichloromonofluoromethane are subjected to a reaction through a liquid phase reaction to generate an intermediate product CCl3CF2CF3 (CFC-215cb), then the CFC-215cb is subjected to a catalytic hydrodechlorination reaction to obtain CH3CF2CF3, and then the CH3CF2CF3 is subjected to a catalytic elimination reaction to generate the target product R-1234yf. According to the method, the self-developed catalyst is used as a liquid phase reaction catalyst, Pd / Pd-AlF3 is used as a hydrogenation catalyst, and AlF3, Cr2O3 or activated carbon is used as an elimination catalyst, so that efficient and environment-friendly R-1234yf preparation is realized under mild conditions, and the method has the advantages of high reaction selectivity, high yield and few byproducts.

The invention relates to the technical field of synthesis of hexafluoro-1, 3-butadiene, in particular to an ion-doped catalyst for synthesis of hexafluoro-1, 3-butadiene as well as a preparation method and application of the ion-doped catalyst. The preparation method comprises the following steps: carrying out mechanical ball milling treatment on a first metal sulfate and a second metal fluoride or a second metal oxide, and then transferring into a hydrothermal kettle for hydrothermal treatment to realize ion doping; after the hydrothermal treatment is finished, washing and drying a product, and finally putting the product into a muffle furnace for roasting treatment to obtain the ion-doped catalyst. The preparation method provided by the invention is simple and good in repeatability, and raw materials are cheap and easy to obtain; the prepared ion-doped catalyst has the advantages of large number of active sites and high catalytic activity.

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.

The invention belongs to the technical field of chemical synthesis, relates to a method for gas-phase synthesis of hexafluorobutadiene, and particularly discloses a method for gas-phase synthesis of hexafluorobutadiene from 1, 2-dichlorohexafluorocyclobutane. According to the invention, 1, 2-dichlorohexafluorocyclobutane and hydrogen are subjected to a hydrodechlorination coupling reaction under the action of a catalyst, such that hexafluorobutadiene gas is obtained. According to the method, hexafluorobutadiene can be efficiently prepared by adopting a gas phase reaction, the operation complexity and equipment requirements are greatly reduced, the generation of intermediate products is reduced, the reaction time is shortened, the production efficiency is improved, and economical efficiency and practicability with extremely competitive power are provided for industrial scale application.

The application discloses a synthesis method of monofluoro olefin compound and belongs to the technical field of organic synthesis. 3 )‑F bond and C(sp 2 )‑F bond are broken to obtain a trisubstituted (E) monofluoro olefin compound 3; when the olefin substrate is gem-di-fluoro olefin 4, a di / trisubstituted (E) monofluoro olefin compound 5 is also obtained at a high yield and excellent stereoselectivity. The synthesis method has the advantages of cheap catalyst, simple and easily-obtained raw materials and good substrate applicability, and the synthesized product is a very valuable fluorinated component, and a new method is provided for modification of fluorine-containing molecules.

The present invention relates to a process for producing trifluoroethylene in a reactor provided with a fixed catalytic bed comprising a catalyst, said process comprising a step a) of reacting a composition A comprising chlorotrifluoroethylene with hydrogen in the presence of a catalyst and in the gas phase to produce a stream B comprising trifluoroethylene, characterized in that said composition A also comprises at least one of the additional compounds C1 chosen from the group consisting of 1,1,1-trifluoroethane, 1,1,1,2-tetrafluoroethane, hexafluorocyclobutene, fluoroethane, 2-chloro-1,1,1-trifluoroethane, 1,2-dichlorohexafluorocyclobutane. The present invention also relates to a chlorotrifluoroethylene composition.

Provided is a method for producing a fluoroethane compound with which it is possible to efficiently produce a fluoroethane compound that is a target product. Comprising a step (A) in which the chlorofluoroethane compound according to the present invention is subjected to a reduction reaction in the presence of a catalyst in which at least one metal selected from the group consisting of Ni, Pd, Pt, Ru and Rh is supported on activated carbon to produce a product containing a fluoroethane compound. With this production method, a fluoroethane compound, which is a target product, can be efficiently produced.

The invention provides a synthesis method of 1, 5-dibromo-3-fluoro-2, 4-xylene, and belongs to the field of synthesis of fine chemical intermediates. According to the method, 2-fluorine-m-xylene is taken as a starting raw material, and 1, 5-dibromo-3-fluoro-2, 4-xylene is obtained through two steps of bromination and reduction. According to the synthesis method, the problem that accurate bromination positioning cannot be realized is solved by optimizing reaction raw materials and operation steps, so that the purity and yield of the product are greatly improved. The synthesis method is simple and stable, and has great industrial production value.

The invention relates to a hydrodechlorination catalyst and a preparation method thereof. Provided is a hydrodechlorination catalyst comprising an active metal supported on a carrier wherein the catalyst is modified with a phosphorus-containing ligand protective agent having the following general formula: Arn-X-R3-n (1) wherein X represents P or P (O); ar represents a C6-20 aryl group or a-O-C6-20 aryl group; r represents H, an alkyl group with 1 to 20 carbon atoms, a cycloalkyl group with 3 to 20 carbon atoms, an alkenyl group with 2 to 20 carbon atoms, a cycloalkyl group with 3 to 20 carbon atoms, an alkyl group with 1 to 20 carbon atoms or an alkenyl group with 2 to 20 carbon atoms; and n represents 1 or 2.

To provide: a useful production method for a fluoroalkyl aromatic compound; and a compound obtained by the production method.SOLUTION: This production method is for a compound represented by formula (4), and comprises a step C for reacting a compound represented by formula (1) and a compound represented by formula (3), in the presence of a reducing agent, a copper compound, and a ligand. RF-X1 (1), Ar-X2 (3) and Ar-RF (4) (where, RF represents a fluoroalkyl group optionally having at least one substituent, X1 represents Cl, Br, or I, X2 represents Cl, Br, or I, and Ar represents an aryl group optionally having at least one substituent or a heteroaryl group optionally having at least one substituent).SELECTED DRAWING: None

The present invention is to make the general formula (2): CF2X 1 -CFX 2 -(CF2) n－4 -CFX 3 -CF2X 4 (2) [wherein, n is the same as in the specification. X 1 , X 2 , X 3 and X 4 are the same or different, representing a halogen atom. 1 and X 2 are not all fluorine atoms, and X 3 and X 4 Not all of them are fluorine atoms.] The reaction of the compounds shown in can reduce the amount of impurities that are difficult to separate and can obtain a perfluorodiene compound in high yield.

The method for producing a fluoroolefin comprises the steps of: n F 2n+1 CH=CHC 4-n F 9-2n in the presence of a sufficient amount of a first catalyst to form a composition comprising a compound of formula (1): n F 2n+1 CX 1 =CClC 4-n F 9-2n wherein n is 1 or 2; X 1 is H or Cl. In some embodiments, the method also includes hydrodechlorinating a compound of formula (1) by reacting CF 3 CCl=CClCF 3 or CF 3 CCl=CHCF 3 CF 2 =CF 2 In other embodiments, the method also includes contacting a compound of formula (1) with C under conditions sufficient to form a composition comprising the compound of formula (1). 2 F 5 CCl 3 In other embodiments, the method comprises coupling 2 F 5 CCl 3 in the presence of a sufficient amount of a second catalyst to form a composition comprising 2 F 5 CH 3 The method further comprises chlorinating

This application provides a method for preparing hexafluorobutadiene, belonging to the field of hexafluorobutadiene manufacturing technology. The method includes the following steps: reacting 1,4-dibromooctafluorobutane, a catalyst solution, and zinc powder under heating conditions and collecting the generated gaseous hexafluorobutadiene; wherein the catalyst solution contains N,N-dimethylformamide, and the reaction temperature is lower than the boiling point of the catalyst solution with a difference of 5℃~40℃; this preparation method can produce hexafluorobutadiene in a one-step reaction using only an industrial-grade catalyst, and has the advantages of simple process steps, low energy consumption, simple catalyst system, low cost, and good safety.