Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Patent
1997-01-14
1997-11-18
Siegel, Alan
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
C07C 1700
Patent
active
056890192
DESCRIPTION:
BRIEF SUMMARY
INDUSTRIAL FIELDS WHERE THE INVENTION CAN BE UTILIZED
This invention relates to a manufacturing method for 1,1,1,2,3,3,3-heptafluoropropane which is important for industrial fields as substitutes, for example, as a fire-extinguish-agent (a substitute for halone), a propellant of aerosol, (paticulaly, propellant for medicines) and so on, doesn't destroy ozone in the ozone layer.
PRIOR ART
As a manufacturing method for 1,1,1,2,3,3,3-heptafluoropropane (Hereinafter, this can be called HFC-227ea.), a method by reacting hexafluoropropene with anhydrous HF at 300.degree. to 400.degree. C. under the presence of an active carbon catalyst (U.S. Pat. No. 902590), and a method by reduction of 2-chloro-1,1,1,2,3,3,3-heptafluoropropane at 100.degree. to 400.degree. C. under the presence of a catalyst (E.P. 539989) have been known.
However, under the reaction at higher temperature as such, olefin impurities which are not easy for separation are produced. In this problem a new method for the separation was proposed (E.P. 512502). Paticulaly, since octafluoroisobutene in olefin impurities produced, is a deadly poisonous compound, it needs a lot of cost for charging this compound to harmless substance. And, when the active carbon catalyst is used, olefin impurities are observed that the activity of the catalyst is lowered, and it also needs to reactivate the catalyst (This is disclosed in E.P. 562509).
OBJECTS OF THE INVENTION
The object of this invention is to provide a manufacturing method HFC-227ea wherein it can be obtained at high yield under the mild condition without producing by-products such as olefin compounds etc.
THE CONSTRUCTION OF THE INVENTION
As a result of eagerly studying of the process of a manufacturing method for HFC-227ea, the inventors found a process in which hexafluoropropene (Hereinafter, this can be called HFP.) is reacted with anhydrous HF under the presence of antimony catalyst to obtain 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) at high yield even under low temperature. This process has economical advantages that equipments for separation, refinement and harmlessness for olefin impurities are unnecessary because the olefin impurities are not produced at all, thus they have completed this invention.
That is, this invention relates to a manufacturing method for 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) wherein 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) is obtained by reacting HFP with anhydrous HF under the presence of antimony catalyst.
In the manufaturing process of this invention, particularly, it is important that the reaction is conducted by using antimony catalyst in liquid phase to obtain HFC-227ea at high yield and under the mild condition, and this process has a novelty that thoroughly differs from the prior arts.
As the above antimony catalyst, pentavalent antimony, trivalent antimony or the mixture of these can be used.
In this case, fluorinated-chlorinated antimony which is obtained by fluorination of antimony pentachloride or antimony trichloride can be used as a catalyst. However, when some chlorine atoms are contained in the catalyst, chlorination of HFP may be conducted to lower the selectivity of this reaction. Accordingly, it is preferable to use completely fluorinated antimony such as antimony pentafluoride and antimony trifluoride as the catalyst. Antimony pentafluoride or antimony trifluoride can be used either alone or mixed each other.
In the manufacturing process of this invention, solvent is not specifically necessary, but anhydrous HF being a reaction material can be used as the solvent. Reaction solvent is needed, to be inactive to the catalyst. For example, perfluoro-compounds such as perfluorohexane, perfluorodecaline, perfluorotributylamine and so on are given.
Using antimony pentafluoride as the catalyst and anhydrous HF as the reaction solvent may restrict the concentration of the antimony catalyst according to the materials of the reaction container due to the storong corrosiveness. When the reaction container is made of fluorocarbon resins, the
REFERENCES:
patent: 4158023 (1979-06-01), von Halasz
patent: 5264639 (1993-11-01), Morikawa
patent: 5315046 (1994-05-01), Fernschild
patent: 5399795 (1995-03-01), Franz et al.
patent: 5616819 (1997-04-01), Boyce
Aoyama Hirokazu
Shibata Noriaki
Daikin Industries Ltd.
Siegel Alan
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