Waxes present in petroleum products_________________?
Correct answer: A. Crystallise out at low temperature
- A. Crystallise out at low temperature
- B. Are not soluble in them
- C. Can be separated out by distillation
- D. Decrease their viscosity
Explanation
Petroleum waxes remain dissolved at sufficiently high temperature but crystallize as the product is cooled, causing cloudiness and possible plugging. They do not generally decrease viscosity; crystallization can restrict flow and increase apparent viscosity.
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