Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Reexamination Certificate
2007-04-25
2010-10-12
Parsa, Jafar (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
Reexamination Certificate
active
07812202
ABSTRACT:
Disclosed is a process for producing hexafluoro-1,3-butadiene, which is used for an etching gas capable of being used in fine processing for semiconductors, safely in industrialization and at low cost economically. Specifically disclosed is a process for producing hexafluoro-1,3-butadiene comprises (1) a step comprising allowing a compound having four carbon atoms each which bonds to an atom selected from the group consisting of a bromine atom, an iodine atom and a chlorine atom, to react with a fluorine gas in the presence of a diluting gas in a gas phase, thereby preparing a mixture containing a product (A), and (2) a step comprising eliminating halogens excluding a fluorine atom with a metal from the product (A) prepared in the step (1) in the presence of a solvent, thereby preparing a mixture containing hexafluoro-1,3-butadiene.
REFERENCES:
patent: 2005/023734 (2005-03-01), None
patent: 2006/077727 (2006-07-01), None
Makhmutov et al (RU 2247104, Chemical abstract), 2005.
James L. Adcock, et al., “Aerosol Direct Fluorination of C1 and C2 Chlorocarbons,” Ind. Eng. Chem. Res., 1989, pp. 1547-1549, vol. 28, No. 10.
N.M. Karimova, et al., “Synthesis of 1,2,3,4-tetrachlorohexafluorobutane,” Russian Chemical Bulletin, International Edition, Oct. 2004, pp. 2336-2337, vol. 53, No. 10.
Ohi Toshio
Ohno Hiromoto
Parsa Jafar
Showa Denko K.K.
Sughrue & Mion, PLLC
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