| 摘要 |
A process for regenerating, and reactivating, coked noble metal catalysts, especially platinum-containing polymetallic catalysts. A gas is employed for burning coke from the coked catalyst comprising an admixture of from about 0.1 percent to about 10 percent oxygen, and at least about 20 percent carbon dioxide, preferably from about 40 percent to about 99 percent, and more preferably from about 50 percent to about 99 percent carbon dioxide. Regeneration time can be considerably shortened, the frequency of reactor regeneration increased, and compression costs lowered by increasing, or maximizing, the carbon dioxide content of the gas used in the coke burnoff. The higher heat capacity of the carbon dioxide permits the use of a higher oxygen content regeneration gas, particularly during the primary coke burn, as contrasted with the regeneration gas used in conventional catalyst regeneration processes which contain large amounts of nitrogen and flue gas as inert gases. |
