2730-62-3Relevant articles and documents
Effects of yttrium-doping on the performance of Cr2O3 catalysts for vapor phase fluorination of 1,1,2,3-tetrachloropropene
Wang, Fang,Fan, Jing-Lian,Zhao, Yang,Zhang, Wen-Xia,Liang, Yan,Lu, Ji-Qing,Luo, Meng-Fei,Wang, Yue-Juan
, p. 78 - 83 (2014)
The synthesis of 2-chloro-3,3,3-trifluoropropene (HCFC-1233xf) from 1,1,2,3-tetrachloropropene was performed over a series of Y2O 3-Cr2O3(F) catalysts and the effect of yttrium-doping on the performance of Cr2O3 catalysts was investigated. Various characterization results showed that the addition of yttrium in the Cr2O3 led to the formation of high valent Cr species in the samples, which could be consequently converted to catalytically active CrOxFy species during the pre-fluorination process. Although the Cr2O3 catalyst with or without yttrium-doping showed very high 1,1,2,3-tetrachloropropene conversion in long term reaction, the addition of yttrium in the Cr 2O3 helped to maintain the high selectivity to HCFC-1233xf, with the highest selectivity (97%) obtained on a 1 mol% yttrium-doped Cr2O3 after 100 h reaction. X-ray photon spectroscopy results on the spent Cr2O3(F) and 1Y 2O3-Cr2O3(F) catalysts indicated that the content of the active CrOxFy species declined after 70 h reaction, which was responsible for the loss of selectivity (from 97% to 88%), while it remained almost unchanged on the spent 1Y2O 3-Cr2O3(F) catalyst.
Selective dehydrofluorination of 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) to 2-chloro-3,3,3-trifluoropropene (HFO-1233xf) using nanoscopic aluminium fluoride catalysts at mild conditions
Kervarec, Ma?va-Charlotte,Marshall, Clara Patricia,Braun, Thomas,Kemnitz, Erhard
, p. 61 - 65 (2019)
Aluminium chlorofluoride (ACF, AlClxF3-x, x = 0.05-0.3) and high-surface aluminium fluoride (HS-AlF3) were tested as heterogeneous catalysts for the reactivity towards 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb), which is a potent greenhouse gas. Selective activation and dehydrofluorination of the C–F bond was observed, under remarkable conditions, such as mild temperatures (70 °C) and without the need for a hydrogen source as a driving force. Consecutive reactions were developed by using C6D6 as a solvent or adding Et3SiH. Thus, the production of the dehydrofluorination product 2-chloro-3,3,3-trifluoropropene (HFO-1233xf) can be coupled to a hydroarylation or hydrodefluorination reaction in one-pot procedures.
Process for the production of 2,3,3,3-tetrafluoropropene
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Paragraph 0055-0066, (2021/01/26)
A process for the production of 2,3,3,3-tetrafluoropropene including the stages: i) in a first reactor, bringing a stream A including 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 B including 2,3,3,3-tetrafluoropropene, HCl, 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 not of a catalyst, with a stream including at least one chlorinated compound selected from the group 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 C including 2-chloro-3,3,3-trifluoropropene, wherein the stream B obtained in stage i) feeds the second reactor used for stage ii); and wherein the electrical conductivity of the stream A provided in stage i) is less than 15 mS/cm.
Method for synthesizing 2-chloro-3, 3, 3-trifluoropropene by gas-phase fluorination
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Paragraph 0026-0050, (2020/11/12)
The invention relates to a method for synthesizing 2-chloro-3, 3, 3-trifluoropropene by gas-phase fluorination, which comprises the following steps: by using 1, 1, 2, 3-tetrachloropropene as a raw material, carrying out hydrogen fluoride gas-phase fluorination under the action of a pre-fluorinated composite catalyst at 240-280 DEG C under the conditions that N2 is less than or equal to 0.3 MPa tosynthesize 2-chloro-3, 3, 3, 3-trifluoropropene; wherein the composite catalyst is prepared from Cr2O3 with the mass content of 85%-98% and ZnO with the mass content of 2%-15%. According to the method, a commercialized reagent 1, 1, 2, 3-tetrachloropropene is adopted as a raw material, the conversion rate and yield of the final product polyhalogenated olefin are effectively increased under the action of the composite catalyst subjected to pre-fluorination treatment, and the method is low in cost and easy to implement.
Method for synthesizing 2, 3, 3, 3-tetrafluoropropene and 2, 3-dichloro-1, 1, 1-trifluoropropane
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Paragraph 0327-0333, (2020/06/09)
The present invention relates to a novel process for the preparation of a compound 2, 3, 3, 3-tetrafluoropropene (1234yf). The compound 1234yf is the latest refrigerant, the OPD (ozone depletion potential) is zero, and the GWP (global warming potential) is zero. Therefore, the method of the present invention relates to a carbene generation pathway, the present invention relates to a process for preparing a compound 2, 3, 3, 3-tetrafluoropropene (1234yf), a compound 243db (2, 3-dichloro-1, 1, 1-trifluoropropane), and optionally a compound 2-chloro-1, 1, 1-trifluoropropene (1233xf) and a compound 243db (2, 3-dichloro-1, 1, 1-trifluoropropane) by a carbene route. The invention also relates to a method for producing the compound 2, 3, 3, 3-tetrafluoropropene (1234yf), in which compound 243db (2, 3-dichloro-1, 1, 1-trifluoropropane) is used as starting material for producing the compound 2, 3, 3, 3-tetrafluoropropene (1234yf).
