Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2006-12-13
2008-08-26
Witherspoon, Sikarl A (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S432000, C568S434000
Reexamination Certificate
active
07417171
ABSTRACT:
The present invention relates to a method for preparing an aromatic dialdehyde, comprising, a) a step of gas phase oxidation reaction for preparing aromatic dialdehyde from dimethyl benzene; b) a step of separation for selectively recovering crude aromatic dialdehyde of molten phase from the reaction product of the step (a); and c) a step of purification for obtaining highly pure aromatic dialdehyde by purifying said crude aromatic dialdehyde, and a manufacturing system used for the preparation method. The method for preparation of the aromatic dialdehyde according to the present invention is simple, effective, and advantageous in that highly pure aromatic dialdehyde can be continuously prepared.
REFERENCES:
patent: 3597483 (1971-08-01), Haarer et al.
patent: 3597485 (1971-08-01), Brill
patent: 4017547 (1977-04-01), Simmons et al.
patent: 5324702 (1994-06-01), Yoo et al.
patent: 6458737 (2002-10-01), Kishimoto et al.
patent: 1217796 (1970-12-01), None
Chae Jong Hyun
Choe Yong Jin
Kang Seong Hoon
Kim Yeong Dae
Lee Dong Il
LG Chem Ltd.
McKenna Long & Aldridge LLP
Witherspoon Sikarl A
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