306-83-2Relevant academic research and scientific papers
Selective hydrogenolysis of CFC-113a by Group VIII transition metal complexes
Cho, Ook-Jae,Lee, Ik-Mo,Park, Kun-You,Kim, Hoon-Sik
, p. 107 - 110 (1995)
Highly efficient and selective hydrogenolysis of CFC-113a (CF3CCl3) to produce HCFC-123 (CF3CHCl2) has been achieved through the use of Group VIII transition metal complexes.The catalytic activity observed was sensitive to solvents and to the structure of the metal complexes. - Keywords: Selective hydrogenolysis; CFC-113a; Group VIII transition metal complexes; Catalysis; Selectivity
Reduction of polyhalofluoroalkanes with formate to hydrogen-bearing alternatives initiated by carbon dioxide anionic radical
Hu, Chang-Ming,Tu, Ming-Hu
, p. 105 - 108 (1991)
Reduction of polyhalofluoroalkanes with formate in the presence of a catalytic amount of persulfate is described.Such a reagent posseses good selectivity in the reduction of carbon-chlorine bonds.A chain mechanism including carbon dioxide anionic radicals and polyhalofluoroalkyl radicals is proposed.
Transfer hydrogenolysis of CFC-113a with aldehydes and metallic Fe or Ni
Seo, Sang Hyun,Hong, Seung-Pyo,Kwag, Chong-Yun,Lee, Hyun-Joo,Kim, Hoonsik,Lee, Ik-Mo
, p. 73 - 78 (1999)
Highly selective transfer hydrogenolysis of CFC-113a (CF3CCl3) to HCFC-123 (CF3CHCl2) was accomplished in the presence of metal powder (Fe or Ni) in THF at 90°C under 8 atm of He. Pressure effects on the catalytic activities depend on the nature of metal catalysts and this behavior can be explained by a different rate determining step in each system. Activation of the C-H bond of THF on metal powder aided by η2 coordinated aldehydes is believed to occur first to produce electron-rich metal hydrides, which enhance the activation of the C-Cl bond of CFC-113a. Then reductive elimination follows to produce HCFC-123. This series of reactions was supported by experiments using deuterated THF and/or DMF and with p-substituted benzaldehydes.
Enhanced Lewis acidity by aliovalent cation doping in metal fluorides
Kemnitz, Erhard,Zhu,Adamczyk
, p. 163 - 170 (2002)
A model regarding the generation of acidity in binary metal fluorides has been proposed and its validity has been examined for several binary fluoride systems with the general compositions MF3/M′F3 and MF2/M′F3. In accordance with this hypothesis, the binary systems (CrF3/AlF3, CrF3/FeF3 and AlF3/VF3) do not show acidities larger than the sum of the acidities of the component fluorides. The hypothesis predicts the generation of Lewis acidity when MF2 is the major component (host) and generation of Bronsted acidity when MF3 acts as the host for the MF2/M′F3. The experimental results (surface acidity and catalytic activity) confirmed the predictions made from this hypothesis for binary combinations MgF2/M′F3 (M′ = Cr, Al, Fe, V). The application of this model is discussed in terms of other parameters: ionic radii and the fluoride affinity of the metal fluorides involved.
Manufacturing method of HCFC-123 and/or HCFC-122
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Paragraph 0139-0141, (2019/12/25)
The present invention relates to a method for producing HCFC-123 (2,2-dichloro-1,1,1-trifluoroethane) and/or HCFC-122 (1,1,2-trichloro-2,2-difluoroethane), wherein at least one reaction step is performed in a microreactor. In particular, a preferred embodiment of the present invention relates to a method for producing HCFC-123 (2,2-dichloro-1,1,1-trifluoroethane) and/or HCFC-122 (1,1,2-trichloro-2,2-difluoroethane), wherein at least one reaction step is performed in a microreactor composed of or made of SiC ("SiC microreactor") or in a microreactor composed of or made of alloy (such as Hastelloy C). In one embodiment, the method for producing HCFC-123 (2,2-dichloro-1,1,1-trifluoroethane) and/or HCFC-122 (1,1,2-trichloro-2,2-difluoroethane) can be effectively combined, because the HCFC-122(1,1,2-trichloro-2,2-difluoroethane) produced by the method according to the present invention using a microreactor, preferably a SiC microreactor, can be preferably and advantageously used as a raw material and/or intermediate material for the production of the HCFC-123 (2,2-dichloro-1,1,1-trifluoroethane), and preferably also used for manufacturing the HCFC-123 (2,2-dichloro-1,1,1-trifluoroethane) in a microreactor. During the manufacturing of the HCFC-123 and/or the HCFC-122, the HCFC-123 and/or the HCFC-122 can be easily purified and/or separated by using only a low energy consumption method, and the method for performing purification and/or separation preferably requires no distillation. Advantageously, the the HCFC-123 and/or the HCFC-122 can be easily separated from the excess HF and a catalyst in an energy-saving manner by phase separation.
Preparation method of trifluoroacetic acid
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Paragraph 0025; 0028; 0031; 0034; 0037, (2019/01/16)
The invention discloses a preparation method of trifluoroacetic acid. The preparation method comprises the following steps: (1), vaporizing 1,1,1-trifluoro-2-chloroethane and chlorine gas, then enabling the 1,1,1-trifluoro-2-chloroethane and chlorine gas to enter a fixed bed reactor with a catalyst, and performing a gas phase chlorination reaction to synthesize 1,1,1-trifluoro-2,2-dichloroethane;(2), vaporizing the 1,1,1-trifluoro-2,2-dichloroethane and oxygen, then performing an oxidation reaction under the action of a light source to obtain trifluoroacetyl chloride, condensing the unreacted1,1,1-trifluoro-2,2-dichloroethane, and then enabling the unreacted 1,1,1-trifluoro-2,2-dichloroethane to return to the reactor; (3), hydrolyzing the trifluoroacetyl chloride to obtain the trifluoroacetic acid. The preparation method has the advantages of a simple technology, high yield, few three wastes and the like; in addition, by the preparation method, the reaction conversion rate is high, the selectivity is high, the reaction production is continuous, and the safety and the environment friendliness are achieved.
A liquid-phase fluorination preparing 1,2-dichloro -3, 3, 3-trifluoropropene method
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Paragraph 0056; 0057, (2017/03/14)
The invention discloses a liquid-phase fluorination preparation method for 1, 2-dichloro-3, 3, 3-trifluoropropene, and in particular relates to the preparation of 1, 2-dichloro-3, 3, 3-trifluoropropene through the liquid-phase fluorination reaction between a compound with the general formula of CF3-xClxCH2-yCLyCH3-zClz and hydrogen fluoride in presence of a fluorination catalyst, wherein in the general formula of the compound, x is 0, 1, 2 or 3; y is 1 or 2; z is 1 or 2; y plus z is 3. The method is mainly used for preparing 1, 2-dichloro-3, 3, 3-trifluoropropene.
Method for combined production of 1,1,2-trifluorotrichloroethane and 1,1,1-trifluorodichloroethane
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Paragraph 0036; 0037, (2017/01/12)
The invention discloses a method for combined production of 1,1,2-trifluorotrichloroethane and 1,1,1-trifluorodichloroethane. The method comprises the following steps: adding reaction raw materials comprising hydrofluoric acid, hexachloroethane and tetrachloroethylene into a reaction autoclave according to a molar ratio of (10-40):(0.8-2.5):(1.2-3.6), reacting, adding a catalyst for catalysis, reacting at 30-250DEG C under 0.3-3.0Mpa for 2-12h, washing with water, washing with an alkali, and carrying out rectifying purification to obtain the products 1,1,2-trifluorotrichloroethane and 1,1,1-trifluorodichloroethane, wherein the catalyst can be metal fluoride or metal chloride, the metal fluoride comprises AlF3, SbF3, SbF5 and ZnF2, and the metal chloride comprises SbCl5. The synthetic method has the advantages of abundant sources and low price of the raw materials, high reaction yield, easy reaction feeding, easy separation and extraction of the generated products, and realization of industrial continuous production.
PROCESS FOR PRODUCING FLUOROETHANE
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Paragraph 0048, (2015/12/04)
Fluorochromium oxide having a fluorine content of not less than 30 wt.% is used for the fluorination reaction. To provide a manufacturing method for fluorine-containing ethane which contains 1, 1, 1, 2, 2-pentafluoroethane as the main component in which the reaction can be performed while controlling the generation of CFCs to the greatest possible extent by fluorinating at least one selected from the group composed of tetrachloroethylene, 2, 2-dichloro-1, 1, 1-trifluoroethane and 2-chloro-1, 1, 1, 2-tetrafluoroethane with hydrogen fluoride.
Effects of M-promoter (M = Y, Co, La, Zn) on Cr2O3 catalysts for fluorination of perchloroethylene
Cheng, Yong-Xiang,Fan, Jing-Lian,Xie, Zun-Yun,Lu, Ji-Qing,Luo, Meng-Fei
, p. 66 - 72 (2013/10/21)
The vapor phase fluorination of perchloroethylene (PCE) to synthesize 2,2-dichloro-1,1,1-trifluoroethane (HCFC-123), 1-chloro-1,2,2,2- tetrafluoroethane (HCFC-124) and pentafluoroethane (HFC-125) was carried out on M-Cr2O3 catalysts with different promoters (M = Y, Co, La, Zn). The catalysts were characterized by X-ray diffraction (XRD), hydrogen temperature-programmed reduction (H2-TPR), Raman spectrum, Ammonia temperature-programmed desorption (NH3-TPD) and X-ray photoelectron spectroscopy (XPS) techniques. It was found that in the pre-fluorination process CrOx (x ≥ 1.5) in M-Cr2O3 catalysts could be transformed into CrOxFy species. The highest activity was obtained on La-Cr2O3(F) catalyst with 90.6% of PCE conversion and 93.7% to total selectivity (HCFC-123 + HCFC-124 + HFC-125) at 300 C. The decline in surface acid sites density of the catalyst could improve the specific reaction rate, and the formation of surface CrOxF y species could enhance the selectivities to HCFC-123, HCFC-124 and HFC-125 for gas phase fluorination of PCE. Copyright - 2013 Published by Elsevier B.V. All rights reserved.
