Initial cleaning
Used oils after they are accepted by the Refinery they are kept in storage tanks where the undergo the process of cleaning by decanting. The initially cleaned oil is then distilled in the Viscolube process.
Used oils Viscolube distillation process
It is carried out in two stages. Used oils are initially vacuum-distilled to remove water and most volatile fractions. Before initial distillation the preheated used oil is mixed with an alkali agent. The addition of this agent saponifies the fatty acids present in the oil and help precipitation of them. The fatty acids saponification facilitates their removal by decanting and decreases their volatility. It prevents the fatty acids from changing into vapour in the distillation column which could contaminate the oils and carried other contaminants. After initial distillation the dehydrated oil is directed to a buffer tank. In the second stage the dehydrated oil stream is directed to fractioning distillation in which the oil is divided into fractions. The column works under high vacuum and has high separation efficiency owing to Gempack produced by Glitsch. Side fractions obtained are properly cleaned in the stripping process and then they are directed to hydrofonishing. The water separated from light gasoil and directed to waste water biological treatment plant. Distillates refining
The gasoil and lube oils fractions are refined with hydrogen in the hydrofinishing plant. The used oil hydrofinishing complex is composed of the following plant cooperating with one another:
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