Published: Jun 1998
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VISCOUS OILS are those petroleum fractions and derived products that have higher boiling points than distillate fuels and are liquid at, or slightly above, room temperature. They contain 20 to 50+ carbon atoms and distill at temperatures above 260°C (500°F). Examples include refinery streams such as gas oils and residuum, heavier fractions obtained from refining processes such as catalytic cracking, reforming, polymerization, solvent extraction, and hydro- and thermal cracking. Viscous oils include finished products such as lubricants, process oils, and insulating oils. Asphalt and coke are discussed only incidentally.