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A METHOD OF RESTORING CATALYTIC ACTIVITY OF A SPENT HYDROPROCESSING CATALYST, A SPENT HYDROPROCESSING CATALYST HAVING RESTORED CATALYTICACTIVITY, AND A HYDROPROCESSING PROCESS
A METHOD OF RESTORING CATALYTIC ACTIVITY OF A SPENT HYDROPROCESSING CATALYST, A SPENT HYDROPROCESSING CATALYST HAVING RESTORED CATALYTICACTIVITY, AND A HYDROPROCESSING PROCESS
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机译:一种还原加氢催化剂的催化活性的方法,一种具有还原催化活性的加氢催化剂和一种加氢方法
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摘要
Disclosed is method for restoring catalytic activity to a hydroprocessing catalyst that has become spent due to its use or to the deposition of carbon thereon. The method includes a carbon reduction step whereby carbon is remov ed from the spent hydroprocessing catalyst in a controlled manner to within a specifically defined concentration range. Following the carbon removal step, the resulting catalyst, having a reduced concentration of carbon, is subject ed to a chelation treatment whereby the resulting carbon-reduced catalyst is contacted with a chelating agent and aged for a time period necessary for realizing the benefit from the controlled carbon reduction step. In a preferred embodiment, the catalyst resulting from the chelation treatment is subjected to a sulfurization treatment involving the incorporation of elemental sulfur therein and contacting therewith an olefin.
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