Slop oil is a complex mixture of hydrocarbons (oil), water, and solid contaminants generated during petroleum refining, storage, and transportation processes. It typically accumulates in oilwater separators, storage tank bottoms, lagoons, and wastewater systems.
This material is often considered a waste or off-spec product stream because it does not meet refinery product standards. However, it still contains valuable hydrocarbons that can be recovered and reused through treatment processes.
Slop oil is also referred to as:
It is an emulsified system, meaning oil, water, and solids are tightly mixed, making separation and processing technically challenging.
| Property | Typical Range |
|---|---|
| Composition | Oil + Water + Solids |
| Oil Content | 10% 90% |
| Water Content | 10% 90% |
| Solids Content | 5% 20% |
| Viscosity | Up to ~1000 cSt (highly variable) |
| Density | Variable (depends on composition) |
| Phase Type | Emulsion (often multi-phase) |
| Oil Purity after Treatment | 13% water, <1000 ppm solids |
Note: Properties vary significantly depending on source (tank cleaning, refinery sludge, separators, etc.).
After proper treatment and recovery, slop oil can be used in several industrial applications:
Although considered waste, slop oil serves important industrial roles:
Slop oil is not just wasteit is a valuable secondary resource in the oil & gas industry. With proper treatment technologies like centrifugation, chemical demulsification, and separation, it can be converted into:



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