Catalyst pretreatment method
AssigneeExxon Research & Engineering Co.
InventorsEdward C. Hsu, John L. Robbins
Life of this patent
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Abstract
An improved pretreatment method for preparing powdered catalysts with well controlled particle size distributions that are free of sub 1 micron particles comprising dispersion of the powdered catalyst in liquid comprised of either a) a hydrocarbon containing low levels of a surfactant or, b) a surfactant containing polar protic solvent, followed by decantation of the suspended finely divided sub 1 micron particles and repeating said sequence until essentially 90% of the sub 1 micron particles have been removed.
Claims10
A liquid phase method for removing sub-1 micron particles adhering to catalyst particles the catalyst containing a Group VIII metal supported on an inorganic refractory oxide as a result of preparation of the catalyst which comprises:
- (a) dispersing the catalyst particles to which the sub-1 micron particles adhere within a liquid comprising a Fischer-Tropsch;
- (b) agitating the dispersion and separating the sub-1 micron particles from the catalyst particles, and concentrating the sub-1 micron particles in the liquid phase;
- and
- (c) separating the sub-1 micron containing liquid phase from the particulate material.
Dependencies are inferred from the claim text.