Organic compounds -- part of the class 532-570 series – Organic compounds – Unsubstituted hydrocarbyl chain between the ring and the -c-...
Reexamination Certificate
2005-09-20
2005-09-20
Kifle, Bruck (Department: 1624)
Organic compounds -- part of the class 532-570 series
Organic compounds
Unsubstituted hydrocarbyl chain between the ring and the -c-...
Reexamination Certificate
active
06946553
ABSTRACT:
Improved processes for producing an ε-caprolactam using a solid catalyst and for producing a catalyst which can be used in the production of ε-caprolactam are provided. In the present invention, a solid catalyst such as a zeolite is treated with an aqueous solution containing an ammonia and at least one compound selected from the group consisting of quaternary ammonium compounds and lower alkylamines. In accordance with the present invention, a zeolite having a high catalyst activity and a long lifetime is produced, and a solid catalyst which has been used in the production of ε-caprolactam can be re-activated. In the present invention, by using the thus obtained zeolite and/or the thus activated solid catalyst, an ε-caprolactam is produced in a high yield over the long period of time.
REFERENCES:
patent: 5212302 (1993-05-01), Kitamura et al.
patent: 5403801 (1995-04-01), Kitamura et al.
patent: 5741904 (1998-04-01), Hoelderich et al.
patent: 6071844 (2000-06-01), Hoelderich et al.
patent: 0234088 (1987-09-01), None
patent: 0494535 (1992-07-01), None
patent: 0544531 (1993-06-01), None
patent: 1065167 (2001-01-01), None
patent: 5170732 (1993-07-01), None
patent: 6107627 (1994-04-01), None
Ichihashi et al., Applied Catalysis A, vol. 221, No. 1-2, pp. 359-366, (2001).
Ichihashi Hiroshi
Matsushita Tsuyoshi
Sugita Keisuke
Birch & Stewart Kolasch & Birch, LLP
Kifle Bruck
Sumitomo Chemical Company Limited
LandOfFree
Process for producing ε-caprolactam and catalyst for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for producing ε-caprolactam and catalyst for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing ε-caprolactam and catalyst for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3434254