Reactivation of arsenic-poisoned noble metal catalyst for removal of acetylene
AssigneePhillips Petroleum Company
InventorDean P. Montgomery
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Abstract
A noble metal hydrogenation catalyst suited for removal of acetylene by hydrogenating the same selectively as when it is in the presence of ethylene from which it is to be removed, e.g., palladium, which has been poisoned by arsenic is reactivated by purging the same with an arsenic-free gas, e.g., an arsenic-free ethylene containing acetylene together with hydrogen, in one embodiment at an elevated temperature, until substantial acetylene removal is occurring as one indication of restoration of activity and selectivity for removal of acetylene. The catalyst can then be employed for the selective removal of acetylene as from a gas containing it and ethylene.
Claims5
In a process for the effective removal of acetylene from a first gas feed containing the same, together with small quantities of arsenic in the form of a gaseous compound thereof, which comprises feeding said gas together with hydrogen at an acetylene removal temperature in contact with a noble metal hydrogenation catalyst, wherein the activity of the catalyst falls off due to arsenic poisoning thereof, the steps which comprise discontinuing the feeding of said first gas when activity of the catalyst has been reduced, feeding a second arsenic-free acid together with hydrogen into contact with said catalyst to effect a purging operation, elevating gradually the temperature of the catalyst until its activity is substantially restored, then discontinuing the feeding of said second gas and then resuming feeding of said first gas and hydrogen to the catalyst.
Dependencies are inferred from the claim text.