Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Reexamination Certificate
2004-07-27
2008-12-16
Sullivan, Daniel M (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
Reexamination Certificate
active
07465841
ABSTRACT:
A method and a device for purifying 1,4-bis(bromodifluoromethyl)benzene are disclosed. In order to solve the problem of hard to purify and separate 1,4-bis(bromodifluoromethyl)benzene crude products, diphenylmethane that has a higher boiling point and does not interact with 1,4-bis(bromodifluoromethyl)benzene is mixed with the 1,4-bis(bromodifluoromethyl)benzene crude products for evaporation. Afterwards, the purity of the vaporized product is detected and only that reaching an expected purity is collected to obtain high-purity 1,4-bis(bromodifluoromethyl)benzene.
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patent: 5268202 (1993-12-01), You et al.
patent: 5874608 (1999-02-01), Pfirmann et al.
patent: 6411094 (1965-03-01), None
patent: 6411094 (1965-03-01), None
Bruns et al (Journal—Association of Official Analytical Chemists, 1980, 63(1), 56-60).
Chang Chung-Chien
Jong Shean-Jeng
Lin Chun-Hsu
Tu Chao-Chou
Chung Shan Institute of Science and Technology
Gale Kellette
Rabin & Berdo P.C.
Sullivan Daniel M
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