Patent ID: 9540573
Date: 2017-01-10
CPC Classifications: B01J,C10G

Claim:
1. A process for making an ultra low sulfur diesel product, wherein said process comprises: a) providing a high purity boehmite comprising more than 98 percent alpha alumina monohydrate in the form of a powder having a silicon oxide concentration of less than 200 ppm and an iron oxide concentration of less than 200 ppm; b) mixing said high purity boehmite with water and an acid at an aluminum hydroxide-to-water ratio of 0.5 to 5:1 to form an extrudable paste; c) extruding said extrudable paste to form a shaped support particle comprising at least 98 weight percent aluminum hydroxide, wherein said weight percent is based on the dry weight of the shaped support particle; d) heat treating said shaped support particle at a controlled temperature of from about 850° F. to 950° F. whereby the shaped support particle is converted to gamma alumina having a material absence of aluminum hydroxide and a material absence of crystalline transitional phase of alumina other than gamma-alumina; e) impregnating said shaped support particle with a hydrogenation catalytic component to thereby provide an impregnated shaped support particle; f) calcining said impregnated shaped support particle at a temperature of from about 870° F. to about 1000° F.; g) contacting said impregnated shaped support particle with a diesel feedstock having a first sulfur concentration above 15 ppm at a temperature from about 392° F. to 788° F. and a pressure of 275 psig to 1500 psig; and h) recovering an ultra low diesel sulfur diesel product having a second sulfur concentration of less than 15 ppm sulfur.