- PROCESS FOR REFINING HCFC-224ca AND/OR CFO-1213ya, PROCESS FOR PRODUCING HCFC-224ca, AND PROCESS FOR PRODUCING CFO-1213ya
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PROBLEM TO BE SOLVED: To provide a process in which a difficult-to-separate HCFC-224ab can easily be removed and HCFC-224ca and/or CFO-1213ya can be produced with high purity and high yield. SOLUTION: Provided is a process for refining HCFC-224ca and/or CFO-1213ya, comprising a step of removing at least a portion of said HCFC-224ab from a mixture containing 1,1,3-trichloro-2,2,3,3-tetrafluoropropane (HCFC-224ca) and/or 1,1,3-trichloro-2,3,3-trifluoropropene (CFO-1213ya) and 1,2,2-trichloro-1,1,3,3-tetrafluoropropane (HCFC-224ab). SELECTED DRAWING: None COPYRIGHT: (C)2019,JPOandINPIT
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Paragraph 0121; 0122
(2019/12/04)
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- PROCESS FOR PRODUCTION OF 2,3,3,3-TETRAFLUOROPROPENE
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The present invention provides a process for producing 2,3,3,3-tetrafluoropropene including the following reaction steps: (i) reducing a halogenated fluoropropane represented by formula (1): ACF2CF2CH2FyAz, wherein A is Cl, Br, or I; x is an integer from 0 to 2; y and z are each an integer from 0 to 3; and the total number of x, y, and z is 3, to produce a 1-halogenated-1,1,2,2-tetrafluoropropane represented by formula (2): ACF2CF2CH3; and (ii) contacting the 1-halogenated-1,1,2,2-tetrafluoropropane obtained in step (i) with a catalyst in a gas phase to produce 2,3,3,3-tetrafluoropropene. According to the invention, 2,3,3,3-tetrafluoropropene (HFO-1234yf) can be produced in a high yield, using inexpensive starting materials.
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Page/Page column 16-17
(2010/04/03)
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- 19F nuclear magnetic resonance studies of halogenated propanes
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The relationship between 19F chemical shifts in halogenated propanes and their structures are elucidated using MNDO calculations to determine the population of rotamers.The pairs of atom gauche to a fluorine atom and van der Waals interaction between the two terminal substituents are responsible for the 19F chemical shifts.The differences among chemical shifts in diastereomers are also discussed in terms of the conformation of molecule.
- Tanuma, T.,Ohnishi, K.,Okamoto, H.,Miyajima, T.,Morikawa, S.
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p. 259 - 284
(2007/10/02)
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- Synthesis of > and Some Chlorofluoropropenes
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The starting substances C3Cl5F3 (1) and C3Cl4F4 (2) prepared earlier by the addition of CCl3F with CClF=CClF and/or CF2=CClF were utilized for the synthesis of chlorofluoropropenes by means of fluorination, reduction of C-Cl bonds in halogenopropanes, and final dehalogenation, all the reactions being performed at atmospheric pressure.The reaction conditions permit laboratory scale production.The contents of the isomeric admixtures in the resultant products were determined by NMR spectroscopy.The starting halogenopropanes 1, 2 represent mixtures of isomers, but in course of the individual synthetic steps the content of the main isomer was generally increased.In comparison with previously used syntheses, our procedure proves advantageous for the synthesis of "perfluoroallylchloride" (9a, isomer purity 95percent).Using this procedure a number of halogenopropanes were prepared and dechlorinated to give the corresponding halogenopropenes (isomer purity percent): CClF2-CClF-CCl2F (2a, 87), CF3-CClF-CCl3 (2b, 78), CClF2-CClF-CClF2 (3a, 87), CF3-CClF-CCl2F (3b, 90), CF3-CClF-CHCl2 (5a, 90), CF3-CClF-CHClF (6a, 73), CClF2-CF=CClF (8a, 93), CF3-CF=CCl2 (8b, 84), 9a, CF3-CF=CClF (9b, 86) and CF3-CF=CHCl (11a, 84).The minor isomers in substance 2 yielded products which were isolated after being combined from several preparations: CClF2-CF2-CHCl2 (5b, 84); CClF2-CF=CHCl (10a, 98), which by addition of chlorine yielded CClF2-CClF-CHCl2 (4a, 95).The NMR spectra of all the major and minor products, excluding perhalogenopropanes, are listed.
- Paleta, Oldrich,Kvicala, Jaroslav,Guenter, Jaroslav,Dedek, Vaclav
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p. 920 - 924
(2007/10/02)
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