754-12-1Relevant academic research and scientific papers
Method for preparing 3, 3, 3-trifluoropropyne through gas-phase dehydrohalogenation
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Paragraph 0052, (2021/06/23)
The invention discloses a method for preparing 3, 3, 3-trifluoropropyne through gas-phase dehydrohalogenation. The method comprises the following steps: taking 1-halogen-3, 3, 3-trifluoropropene or/and 2-halogen-3, 3, 3-trifluoropropene (halogen = F or Cl or Br or I) as a raw material, and carrying out gas-phase dehydrohalogenation reaction in the presence of a catalyst to obtain the 3, 3, 3-trifluoropropyne. The method disclosed by the invention is mainly used for producing the 3, 3, 3-trifluoropropyne in a gas-phase continuous circulation manner at a high conversion rate and high selectivity.
PROCESS FOR THE PRODUCTION OF 2,3,3,3-TETRAFLUOROPROPENE
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Paragraph 0050-0060, (2020/10/31)
The present invention relates to a process for the production of 2,3,3,3-tetrafluoropropene comprising the stages: i) in a first reactor, bringing 2-chloro-3,3,3-trifluoropropene into contact with hydrofluoric acid in the gas phase in the presence of a catalyst, in order to produce a stream A comprising 2,3,3,3-tetrafluoropropene, HF and unreacted 2-chloro-3,3,3-trifluoropropene; and ii) in a second reactor, bringing hydrofluoric acid into contact, in the gas phase in the presence or absence of a catalyst, with at least one chlorinated compound selected from the group consisting of 1,1,1,2,3-pentachloropropane, 2,3-dichloro-1,1,1-trifluoropropane, 2,3,3,3-tetrachloropropene and 1,1,2,3-tetrachloropropene, in order to produce a stream B comprising 2-chloro-3,3,3-trifluoropropene, characterized in that the stream A obtained in stage i) feeds said second reactor used for stage ii); and in that the pressure at the inlet of said first reactor of stage i) is greater than the pressure at the inlet of said second reactor of stage ii).
Activation of pentafluoropropane isomers at a nanoscopic aluminum chlorofluoride: Hydrodefluorination versus dehydrofluorination
Ahrens, Mike,Braun, Thomas,Kemnitz, Erhard,Kervarec, Ma?va-Charlotte
supporting information, p. 2623 - 2635 (2020/11/26)
The hydrofluorocarbon 245 isomers, 1,1,1,3,3-pentafluoropropane, 1,1,1,2,2- pentafluoropropane, and 1,1,1,2,3-pentafluoro-propane (HFC-245fa, HFC-245cb, and HFC-245eb) were activated through C-F bond activations using aluminium chlorofluoride (ACF) as a catalyst. The addition of the hydrogen source Et3SiH is necessary for the activation of the secondary and tertiary C-F bonds. Multiple C-F bond activations such as hydrodefluorinations and dehydrofluorinations were observed, followed by hydroarylation and Friedel-Crafts-type reactions under mild conditions.
Selective Copper Complex-Catalyzed Hydrodefluorination of Fluoroalkenes and Allyl Fluorides: A Tale of Two Mechanisms
Andrella, Nicholas O.,Xu, Nancy,Gabidullin, Bulat M.,Ehm, Christian,Baker, R. Tom
, p. 11506 - 11521 (2019/08/20)
The transition to more economically friendly small-chain fluorinated groups is leading to a resurgence in the synthesis and reactivity of fluoroalkenes. One versatile method to obtain a variety of commercially relevant hydrofluoroalkenes involves the catalytic hydrodefluorination (HDF) of fluoroalkenes using silanes. In this work it is shown that copper hydride complexes of tertiary phosphorus ligands (L) can be tuned to achieve selective multiple HDF of fluoroalkenes. In one example, HDF of the hexafluoropropene dimer affords a single isomer of heptafluoro-2-methylpentene in which five fluorines have been selectively replaced with hydrogens. DFT computational studies suggest a distinct HDF mechanisms for L2CuH (bidentate or bulky monodentate phosphines) and L3CuH (small cone angle monodentate phosphines) catalysts, allowing for stereocontrol of the HDF of trifluoroethylene.
Co-production method of 2,3,3,3-tetrafluoropropylene and trans-1,3,3,3-tetrafluoropropylene
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Paragraph 0080; 0081; 0082; 0083; 0090; 0091, (2018/04/03)
The invention discloses a co-production method of 2,3,3,3-tetrafluoropropylene and trans-1,3,3,3-tetrafluoropropylene. A mixture of 1,1,1,2,2-pentachloropropane and 1,1,1,3,3-pentachloropropane and anhydrous hydrogen fluoride are preheated and then are introduced into a first reactor, reaction is performed under the effect of a La2O3-Cr2O3 catalyst to obtain a first reactor product; the first reactor product is directly introduced into a second reactor without separation, and catalytic fluorination reaction is performed under the effect of a Ga2O3-Y2O3-Cr2O3 catalyst to obtain a second reactorreaction product; the second reactor reaction product is separated, and then the products 2,3,3,3-tetrafluoropropylene and trans-1,3,3,3-tetrafluoropropylene are obtained. The co-production method has the advantages that the process is simple, device investment is small, the activity of the catalysts is good, the selectivity is high, the total service life is long, the proportions of the two products can be flexibly adjusted according to the market demands, and the like.
CATALYST AND PROCESS USING THE CATALYST FOR MANUFACTURING FLUORINATED HYDROCARBONS
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Page/Page column 23; 24, (2018/03/28)
A catalyst comprising chromia and at least one additional metal or compound thereof and wherein the catalyst has a total pore volume of greater than 0.3 cm3/g and the mean pore diameter is greater than or equal to 90 ?, wherein the total pore volume is measured by N2 adsorption porosimetry and the mean pore diameter is measured by N2 BET adsorption porosimetry, and wherein the at least one additional metal is selected from Li, Na, K, Ca, Mg, Cs, Sc, Al, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Co, Rh, Ir, Ni, Pd, In, Pt, Cu, Ag, Au, Zn, La, Ce and mixtures thereof.
GAS-PHASE CATALYTIC FLUORINATION
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Paragraph 0067, (2018/03/23)
PROBLEM TO BE SOLVED: To provide a method for producing a fluoride by subjecting a chloride to catalytic fluorination using hydrogen fluoride in a gas phase. SOLUTION: There is provided a fluorination method, the method comprising the following steps (1) and (2): (1) an activation step of bringing a fluorination catalyst into contact with an oxidizer-containing gas stream for at least one hour; and (2) a reaction step of reacting a chloride with hydrogen fluoride in a gas phase in the presence of a fluorination catalyst. Preferably, the reaction method is carried by alternately and repeatedly performing a plurality of reaction steps and a plurality of regeneration steps, the reaction steps comprise subjecting the chloride and the hydrogen fluoride to gas phase reaction in the presence of the fluorination catalyst and the regeneration steps comprises bringing the fluorination catalyst into contact with the oxidizer-containing gas stream. More preferably, the oxidizer-containing gas stream in the activation step and/or the regeneration steps contains hydrogen fluoride in addition to an oxidizer or is air containing no hydrogen fluoride. SELECTED DRAWING: None COPYRIGHT: (C)2018,JPOandINPIT
CATALYST AND PROCESS USING THE CATALYST FOR MANUFACTURING FLUORINATED HYDROCARBONS
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Page/Page column 20; 21, (2018/03/28)
A catalyst comprising one or more metal oxides, wherein the catalyst has a total pore volume equal to or greater than 0.3 cm3/g and a mean pore diameter greater than or equal to 90 ?, where in the pore volume is measured using N2 adsorption porosimetry and the mean pore diameter is measured using N2 BET adsorption porosimetry.
METHOD FOR PRODUCING FLUOROPROPENE
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Paragraph 0062; 0063, (2018/10/19)
The present invention provides an economically advantageous method for efficiently producing a fluorine-containing compound while ensuring high conversion of the starting compound, reducing production of 245cb, and reducing equipment costs and energy costs. Specifically, the present invention provides a method for producing a fluorine-containing compound represented by Formula (3): CF3CFYnCH2Zn (wherein n is 0 or 1, one of Y and Z is H, and the other is F or Cl) by successively reacting at least one chlorine-containing compound selected from the group consisting of chlorine-containing fluoroalkane represented by Formula (1): CX3CHClCH2Cl (wherein X is independently F or Cl, with the proviso that at least one X is F) and chlorine-containing fluoroolefin represented by Formula (2): CX3CCl═CH2 (wherein X is independently F or Cl, with the proviso that at least one X is F) with anhydrous hydrogen fluoride in the presence of a fluorination catalyst, wherein the concentration of hydrogen chloride in a reactor inlet gas is not less than 0.01 vol % and not more than 10 vol %.
