C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/131
C10G 25/00 (2006.01) C10G 65/04 (2006.01)
Patent
CA 1051807
Abstract of the Disclosure: A method of removing a catalyst-poisoning contaminant, such as arsenic or selenium, from a hydrocarbonaceous fluid, such as a synthetic crude, characterized by a multi-step process as follows. First, at least two guard beds are prepared from a plurality of particles of material that is either iron, cobalt, nickel, oxides, or sulfides of these metals or mixtures thereof. Next, the syn- thetic crude oil is admixed with hydrogen at a superatmospheric pressure of at least 500 pounds per square inch gauge (psig) and flowed past the particles serially through the guard beds, contacting the particles in the first bed at a temperature in the range of from about 300 to about 550°F and contacting the particles in the second and subsequent guard beds at a tempera- ture greater than said first bed and greater than 550 and up to about 850°F. Some reduction in the concentration of the con- taminant is effected in the first, low temperature guard bed. A generalized distribution of the contaminant over a major part of the low temperature guard bed is effected, instead of a high concentration in the first part of the bed to be contacted. Surprisingly, the low temperature bed effects a more general deposition of the contaminant on the second, high temperature bed, and prevents flow-blocking concentration in the first part of the high temperature guard bed. Also disclosed are specific process details, including a preferred type of material.
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