Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1981-03-13
1982-11-30
Konopka, P. E.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
568861, B01J 2394, B01J 2392, C07C 2900
Patent
active
043614957
ABSTRACT:
This invention describes a method of regenerating the activity of deactivated supported-nickel catalysts that have lost activity after use as a hydrogenation catalyst in the finishing stage of the process of conversion of butynediol to butanediol. The method comprises contacting said deactivated catalyst with hydrogen at a temperature of about 200.degree. to 500.degree. C. to convert surface polymers to gaseous compounds and removing said gaseous compounds from the vicinity of the thus-treated catalyst. In the preferred form of the invention, in a single step, a slow stream of hydrogen is passed through the deactivated catalyst in situ as a fixed bed and the gaseous compounds are removed simultaneously in the hydrogen stream.
REFERENCES:
patent: 3449445 (1969-06-01), Wetherill
patent: 3479411 (1969-11-01), Adam et al.
patent: 3759845 (1973-09-01), Rudoff et al.
patent: 3926842 (1975-12-01), Suggitt et al.
patent: 3950441 (1976-04-01), Rudoff et al.
patent: 4002692 (1977-01-01), Mabuchi et al.
De Thomas Waldo
Hort Eugene V.
GAF Corporation
Konopka P. E.
Magee Jr. James
Mohr J. Gary
Ward Joshua J.
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