Daniel A Farrell

US Patent:

40898067, May 16, 1978

Filed:

Apr 1, 1977

Appl. No.:

5/783666

Inventors:

Daniel R. Farrell - Anaheim CA
John W. Ward - Yorba Linda CA

Assignee:

Union Oil Company of California - Los Angeles CA

International Classification:

B01J 2120
B01J 2394
C10G 2302

US Classification:

252413

Abstract:

A process for removing vanadium and nickel deactivants from contaminated hydrodesulfurization catalysts comprising Group VIB and/or VIII active components on refractory oxide supports comprising contacting said catalysts with an aqueous solution of (1) oxalic acid and (2) at least one inorganic component selected from the class consisting of nitric acid and water-soluble nitrate salts. The removal of vanadium and nickel contaminants from the surface of a deactivated catalyst by the process of the invention substantially rejuvenates the catalyst for hydrodesulfurization purposes, provided such removal is accomplished prior to burning off any coke that may also be present on said catalysts.

US Patent:

41220005, Oct 24, 1978

Filed:

Jan 5, 1978

Appl. No.:

5/867193

Inventors:

Daniel R. Farrell - Anaheim CA
John W. Ward - Yorba Linda CA

Assignee:

Union Oil Company of California - Los Angeles CA

International Classification:

C10G 2302

US Classification:

208210

Abstract:

A process for removing vanadium and nickel deactivants from contaminated hydrodesulfurization catalysts comprising Group VIB and/or VIII active components on refractory oxide supports comprising contacting said catalysts with an aqueous solution of (1) oxalic acid and (2) at least one inorganic component selected from the class consisting of nitric acid and water-soluble nitrate salts. The removal of vanadium and nickel contaminants from the surface of a deactivated catalyst by the process of the invention substantially rejuvenates the catalyst for hydrodesulfurization purposes, provided such removal is accomplished prior to burning off any coke that may also be present on said catalysts.