"Hydrofining thermally cracked shale-oil naphtha at high temperatures, pressures, and space velocities has been investigated for reducing high sulfur and gum content and improving stability, volatility, and octane characteristics. Specification gasoline in high yields may be produced at 950 degrees to 1000 degrees F. and 400 to 800 pounds per square inch. The higher pressure is more favorable for removing sulfur and gum-forming compounds at the higher temperatures desirable for increasing octane numbers. Hydrofining heavy naphtha and blending with caustic-washed light naphtha gives lower hydrogen consumption, better gasoline yield, and gasoline with better volatility and sensitivity than hydrofining whole naphtha."