residual oil
1
6.1
- noun
- /rɪˈzɪdʒuəl ɔɪl/
- Specialized
:
aceite residual
- Many industries rely on residual oil from the distillation process for producing energy and other products.
Examples
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After the distillation, the leftover residual oil is often used in manufacturing or as a heating fuel.
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There are billions of barrels of North Sea oil that are left behind as reservoirs deplete through the course of normal production, and CO2 is the most efficient means of producing this residual oil if injected into the reservoir in the secondary recovery effort.
Blog text (32) -
And the lignite sits right in the middle of billions of barrels of residual oil.
Blog text (32) -
Eventually, smooth and durable blacktop road surfaces would be made with the thickest residual oil from refineries.
Academic text (2009) -
In secondary recovery efforts, wherein depleted oil fields are flushed to recover residual oil, CO2 works best of all techniques.
Blog text (32) -
Refineries were originally built to distill kerosene for lamps and to supply some of the viscous residual oil as a lubricant for machinery.
Academic text (2009) -
While easy-flowing distilled oil was most convenient for home heating, the lower-cost residual oil that must be heated to be pumped has fueled ships, and industrial and electric power boilers over the last century.
Academic text (2009) -
The oil leaking from the spindle can be atomized by the high-speed rotating test article, and the residual oil can be atomized by the rotor fragments during burst.
Academic text (1993) -
The engineer explained how residual oil can be converted into more useful fuels through advanced refining techniques.
Synonyms
5
3.5
A heavy oil that heats buildings and runs engines
Thick heavy oil that remains after crude oil is heated and separated, often used as fuel
Surface Forms
Morphology
The phrase is directly compositional: 'residual' means 'remaining' and 'oil' is a familiar substance, so a learner who knows both words can infer 'oil that remains' (e.g., after distillation). This adjective+noun combination is a common, cross-linguistic way to express leftover material, making the meaning immediately accessible to a B1 learner.
Etymology
Residual oil comes from the simple image of oil left after the main processing of crude fuel. The word residual means 'what remains' and the phrase describes the heavy oil that stays behind and is often 'used as fuel' or processed further.