Patent ID: 9029281
Filing Date: 2015-05-12
Classification: B01J,C10G

Abstract:
1. A method for restoring catalytic activity to a hydroprocessing catalyst comprising a Group VIB metal component, a Group VIII metal component, or both metal compounds on a support material, wherein said hydroprocessing catalyst has become spent as a result of its use so as to provide a spent hydroprocessing catalyst having a carbon content above 0.5 wt. %, and to provide an additive impregnated composition, wherein said method comprises: regenerating said spent hydroprocessing catalyst to remove at least a portion of the carbon therefrom to provide a regenerated hydroprocessing catalyst; treating said regenerated hydroprocessing catalyst with a chelating agent capable of forming a complex with a metal component of said hydroprocessing catalyst and selected from the group consisting of compounds consisting of aminocarboxylic acids, polyamines, amino alcohols, oximes, and polyethylene imines, by incorporating said chelating agent into said regenerated hydroprocessing catalyst to provide a chelant treated regenerated hydroprocessing catalyst; drying said chelant treated regenerated hydroprocessing catalyst to provide a dried chelant treated regenerated hydroprocessing catalyst having a volatiles content in the range of from 0.5 to 25 wt % LOI; and incorporating a polar additive comprising a heterocompound having polarity and a dipole moment of at least 0.45 and selected from a group consisting of amide compounds into said dried chelant treated regenerated hydroprocessing catalyst to provide said additive impregnated composition.