Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
2005-04-19
2005-04-19
Davis, Brian (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
Reexamination Certificate
active
06881864
ABSTRACT:
In the method of the present invention, xylylenediamine is produced by a two-stage hydrogenation of a dicyanobenzene compound. In a first stage (a), the hydrogenation is performed until a conversion of nitrile groups reaches 90 mol % or higher and less than 99.9 mol %. In a second stage (b), the hydrogenation is further continued at temperatures 10° C. or more higher than in the step (a) until the conversion of nitrile groups reaches a level which is higher than that attained in the step (a) and equal to 99.5 mol % or more. In the present invention, a highly pure xylylenediamine containing a minimized amount of cyanobenzylamine is efficiently produced in a simple manner without needing a specific purification, and also without deteriorating the use efficiency of the catalyst while reducing the amount of the dicyanobenzene compound remaining not reacted and the generation of the intermediate cyanobenzylamine.
REFERENCES:
patent: 3647054 (1972-03-01), Tsubol et al.
patent: 6114277 (2000-09-01), Miura et al.
patent: 6476267 (2002-11-01), Fuchigami et al.
patent: 1 193 244 (2002-04-01), None
patent: 1 279 661 (2003-01-01), None
patent: 6-121929 (1994-05-01), None
Communication and European Search Report mailed Jul. 26, 2004, for No. EP 04 00 4779.
M. Kawakatsu, et al., Xylylenediamine by hydrogenation of phthalonitrile, Chemical Abstracts No. XP002276589, and JP No. 38-008719 (Abstract only), Oct. 21, 1960.
K. Nakamura, et al., “Process for manufacturing high purity xylylenediamine”, Chemical Abstracts No. XP002284399, and JP No. 2003-026638 (Abstract only), Jan. 29, 2003.
K. Amakawa, et al., “Process for manufacturing aromatic dimethylamine”, Chemical Abstracts No. XP002276592, and JP No. 2003-327563 (Abstract only), Nov. 19, 2003.
Amakawa Kazuhiko
Gouroku Kazushi
Davis Brian
Mitsubishi Gas Chemical Company Inc.
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