Coking reactivities of Australian shale oils

✍ Scribed by Pinky Udaja; Gregory J. Duffy; Martin D. Chensee

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 574 KB
• Volume: 69
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(90)90073-y

✦ Synopsis

Coking of oil on recycle solids represents the most significant cause of loss of yield during the processing of Australian oil shales. The kinetics of coke formation were measured for eight Australian shale oils on their respective shale ashes. The reactivity of Stuart ashes was found to decrease as the temperature under which they were produced increased. Preparation in a steam atmosphere resulted in an even greater reduction in their reactivity. Ashes prepared in a fluidized bed combustor were found to be less reactive than those prepared in a muflle furnace at the same temperature. A strong correlation was found between the reactivity of these ashes and their surface area. There appeared to be no difference in the coking reactivity of freshly prepared ashes and those stored for 15 days. The coking kinetics of oil fractions with different boiling point ranges on Stuart shale ash were determined. The highest rate of coking was found in oil fractions with high boiling point components. A strong correlation was found between oil coking reactivities and their nitrogen contents.