Residuum Distillation Review

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Residuum Distillation Review

Residuum distillation: The second-stage process involves distilling the portion of the first-stage that did not volatilize. Lubricating oils are obtained from this portion, which is referred to as thboil at a lower temperature. Distillation of the residuum produces oils of several boiling point ranges. The higher the boiling point, the higher the carbon content of the oil molecules in a given range. More importantly, viscosity also varies with the boiling point and the number of carbon atoms in the oil molecules.