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
2006-10-03
2006-10-03
Davis, Brian (Department: 1621)
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,...
C502S026000, C502S027000, C502S028000, C502S029000, C502S030000, C502S031000, C502S032000, C502S033000
Reexamination Certificate
active
07115537
ABSTRACT:
A process for the regeneration of a zeolitic catalyst which is at least partially exhausted by use in the synthesis of optionally substituted methylenedianiline (MDA) and derivatives thereof, or of a mixture of optionally substituted MDA and derivatives thereof, with a higher homologous product the process involving washing said catalyst with an aromatic compound having at least one substitutent on the aromatic ring having activating characteristics with respect to the electrophilic substitution, in liquid or at least partially liquid phase.
REFERENCES:
patent: 4908341 (1990-03-01), Pruden et al.
patent: 5241119 (1993-08-01), Clerici et al.
Organic Chemistry 4thedition, Pine et al., McGraw-Hill Book Co., NY, 1980, p. 615.
Bosetti Aldo
De Angelis Alberto
Faris Otello
Perego Carlo
Davis Brian
Dow Global Technologies Inc.
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