Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Patent
1997-08-26
2000-05-09
Kight, John
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
556136, 570176, C07C 1908, C07F 1500
Patent
active
060606282
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP 96/00273, filed Feb. 8, 1996 now WO 96/26914 published Jun. 9, 1996.
INDUSTRIAL FIELDS WHERE THE INVENTION CAN BE UTILIZED
This invention relates to a manufacturing method for 1,1,1,3,3-pentafluoropropane which is a useful compound that can be substituted for CFC and HCFC to be used as a cooling medium, a blowing agent, and a cleaning agent.
PRIOR ART
As a manufacturing method for 1,1,1,3,3-pentafluoropropane, it is known that 2,3-dichloro-1,1,1,3,3-pentafluoropropane and 2,2,3-trichloro-1,1,1,3,3-pentafluoropropane as raw materials are reduced with hydrogen by using a palladium catalyst supported by active carbon etc.(see the Japanese Patent Opening No. 256235/94).
However, the said known reference does not disclose the process for producing 1,1,1,3,3-pentafluoropropane with good efficiency and economy on an industrial scale.
OBJECTIVES OF THE INVENTION
The object of this invention is to provide a manufacturing method based on a process of producing 1,1,1,3,3-pentafluoropropane with good efficiency and economy on an industrial scale.
THE CONSTRUCTION OF THE INVENTION
As a result of closely studying a manufacturing method for 1,1,1,3,3-pentafluoropropane with good efficiency and economy on an industrial scale, the inventors found that 2,3-dichloro-1,1,1,3,3-pentafluoropropane as a raw material is reduced with hydrogen through gaseous-phase reaction under the presence of a hydrogenation catalyst at not less than the atmospheric pressure, resulting reaction products are introduced into a condenser in which component composed of hydrogen and hydrogen chloride as non-condensation component and component composed of 1,1,1,3,3-pentafluoropropane as a condensation component are obtained, and 1,1,1,3,3-pentafluoropropane is separated from the condensation component so as to obtain it with high yield. Besides, they found that hydrogen is separated from the component composed of hydrogen and hydrogen chloride which are obtained as the non-condensation component and recycling this hydrogen to said reduction reaction results in no loss of hydrogen and high improvement of economy. Thus, the present invention has been accomplished.
That is, the present invention relates to a manufacturing method for 1,1,1,3,3-pentafluoropropane comprising: hydrogen under the presence of hydrogenation catalyst in gaseous phase; cooler condenser, so that either a component composed of hydrogen and hydrogen chloride as non-condensation component and another compoment composed of 1,1,1,3,3-pentafluoropropane as condensation component are obtained, or a component composed of hydrogen as non-condensation component and another component composed of hydrogen chloride and 1,1,1,3,3-pentafluoropropane as condensation component are obtained; the said step B, and it is recycled to the said step A; and condensation component of the said step B.
In a manufacturing method of the present invention, as for the hydrogenation catalyst used in the step A, though the known catalysts having the hydrogenation ability can be used, preferably, the catalyst composed of palladium is preferable.
As for the catalyst composed of palladium, it can be solely palladium, or it can be added by other metals for improving the ability of acid-resistance or preventing it from sintering. As these additive metals, there are exemplified at least one metal selected from the group of silver, gold, copper, tellurium, zinc, chromium, rhenium, cobalt, nickel, iridium, ruthenium, rhodium, tantalum, niobium, molybdenum, osmium and tungsten, and so on.
A ratio of the additive metals to the palladium is from 0.01 to 100% by weight, preferably from 0.1 to 30% by weight.
A preparing method can be the known preparing method for hydrogenation catalyst. For example, the method can be given in which after an aqueous solution of the salt containing the component of the catalyst or an aqueous solution added by hydrochloric acid is impregnated to the carrier, it can be dried and reduced with hydrogen etc.
As the carrier for the hydrogenation cataly
REFERENCES:
patent: 5243105 (1993-09-01), Scott et al.
patent: 5659093 (1997-08-01), Takubo et al.
Aoyama Hirokazu
Shibata Noriaki
Yamamoto Akinori
Aulakh Charanjit S.
Daikin Industries Ltd.
Kight John
LandOfFree
Manufacturing method for 1,1,1,3,3-pentafluoropropane does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Manufacturing method for 1,1,1,3,3-pentafluoropropane, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manufacturing method for 1,1,1,3,3-pentafluoropropane will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1066613