Organic compounds -- part of the class 532-570 series – Organic compounds – Unsubstituted hydrocarbyl chain between the ring and the -c-...
Reexamination Certificate
2005-01-11
2005-01-11
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
06841666
ABSTRACT:
The invention relates to a process for the preparation ε-caprolactam starting from 6-aminocapronitrile by hydrolysis/oligomerisation followed by de-oligomerisation/cyclisation using superheated steam characterized in that the hydrolysis/oligomerisation is performed with superheated steam converting 6-aminocapronitrile into a molten phase and a gas phase comprising ammonia, ammonia is continuously separated off and the de-oligomerisation/cyclisation is performed by treating the molten phase further with superheated steam. The invention also relates to a process for the preparation of ε-caprolactam starting from 6-aminocapronitrile by hydrolysis/oligomerisation followed by de-oligomerisation/cyclisation characterized in that the preparation is performed in a horizontal scraped-surface reactor, the hydrolysis/oligomerisation is performed with superheated steam converting 6-aminocapronitrile into a molten phase and a gas phase comprising ammonia, ammonia is continuously separated off and the de-oligomerisation/cyclisation is performed by treating the molten phase further with superheated steam.
REFERENCES:
patent: 5596070 (1997-01-01), Goetz
patent: 860 431 (1998-08-01), None
Buijs Wim
Wolters Henricus Franciscus Wilhelmus
DSM IP Assets B.V.
Kifle Bruck
Mayer Brown Rowe & Maw LLP
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