Shale oil residual fuel

The shale oil residual had been hydrotreated to a substantial degree, providing it with a hydrogen content very similar to the No. 2 petroleum distillate fuel. The shale oil residual fuel had viscosity characteristics similar to a viscous No. 4 petroleum distillate fuel. The nitrogen content of the hydrotreated shale oil residual was 0.49 weight percent. 

Test Results with Shale Oil Residual Fuel. Tests were performed with a shale oil residual fuel which had the viscosity characteristics of a heavy No. 4 petroleum distillate fuel. The tests were performed after heating the fuel to 160°F to reduce its viscosity to 7 cs in an attempt to enhance the fuel atomization and vaporization process. Even with this degree of heating, this fuel has a viscosity twice the level of other fuels tested. 

---