Method for starting-up a naphtha hydrorefining process
AssigneeExxon Research & Engineering Co.
InventorsLloyd A. Pine, William E. Winter
Life of this patent
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Abstract
A naphtha hydrorefining process is initiated by contacting an olefinic naphtha feed at hydrorefining conditions including a pressure below about 200 psig, with hydrogen and a catalyst that has been partially deactivated by treating a fresh or a regenerated catalyst with a substantially non-metals containing hydrocarbonaceous oil in the presence of hydrogen under conditions sufficient to decrease the hydrogenation activity of the catalyst.
Claims18
A method for starting up a naphtha hydrorefining process for removing sulfur contaminants from said naphtha, which comprises:
- contacting naphtha containing said sulfur contaminants and at least 10 volume percent olefins with a hydrogen-containing gas and with a partially deactivated catalyst under hydrorefining conditions including a pressure ranging from about 60 psig to less than 200 psig, and at a temperature ranging from about 400.degree. to about 800.degree. F., said catalyst having been deactivated by contacting a fresh or a regenerated hydrorefining catalyst having hydrogenation and desulfurization activity with a substantially non-metals containing hydrocarbonaceous oil in the presence of a hydrogen-containing gas under conditions and for a time sufficient to decrease the hydrogenation activity of said fresh or regenerated catalyst.
A method for starting up a naphtha hydrorefining process for removing sulfur from said naphtha, which comprises:
- (a) contacting a fresh or regenerated hydrorefining catalyst with a substantially non-metals containing naphtha, said naphtha comprising at least 10 volume percent olefins, and with a hydrogen-containing gas, at a pressure ranging from about 250 to about 400 psig and at a temperature ranging from about 400.degree. to about 800.degree. F. for a time sufficient to decrease the hydrogenation activity of said catalyst, and
- (b) contacting the resulting partially deactivated catalyst with a hydrogen-containing gas and with a naphtha feed comprising at least 10 volume percent olefins, at hydrorefining conditions, including a pressure of not more than about 195 psig and a temperature ranging from about 400.degree. to about 800.degree. F., and
- (c) recovering a hydrorefined naphtha comprising less than 100 weight ppm sulfur.
Dependencies are inferred from the claim text.