Catalyst – solid sorbent – or support therefor: product or process – Regenerating or rehabilitating catalyst or sorbent – Treating with a liquid or treating in a liquid phase,...
Reexamination Certificate
2005-06-14
2005-06-14
Silverman, Stanley S. (Department: 1754)
Catalyst, solid sorbent, or support therefor: product or process
Regenerating or rehabilitating catalyst or sorbent
Treating with a liquid or treating in a liquid phase,...
C502S053000
Reexamination Certificate
active
06905997
ABSTRACT:
A process is provided for the regeneration of a heterogeneous catalyst used for the preparation of compounds containing NH2groups by the hydrogenation, with hydrogen, of compounds containing at least one unsaturated carbon-nitrogen bond, whereina) the feed of the compound to be hydrogenated is stopped andb) the heterogeneous catalyst is treated with a compound of the formulain-line-formulae description="In-line Formulae" end="lead"?R1R2N—CO—R3 (I),in-line-formulae description="In-line Formulae" end="tail"?in whichR1is hydrogen or C1-C4alkyl andR2, R3independently of one another are each hydrogen or C1-C4alkyl or together are a C3-C6alkylene group,or mixtures of such compounds, at a pressure ranging from 0.1 to 30 MPa and a temperature ranging from 100 to 300° C., with the proviso that the compound of formula (I) is in liquid form during the treatment.
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Houben-Weyl, Bd. 11/1 (Stickstoffverbindungen II, Amine), S. 545-574, 4. Auflage.
Ansmann Andreas
Bassler Peter
Fischer Rolf-Hartmuth
Luyken Hermann
Melder Johann-Peter
BASF - Aktiengesellschaft
Novak Druce & Quigg LLP
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