8/30/2023 0 Comments Dewaxing process of light gas oilThe characteristics of the ideal de-waxing solvent include the following: the low solvent power of wax, high solvent power for oil, low freeze point, low viscosity, less in cost, non-toxic and have chemical and thermal stabilities (Wauquier, 2000). The paraffin enriched by-products of these processes are a mixture of oil and wax, the so-called slack waxes. During the de-waxing, the paraffin waxes are separated from the lubricating oil by solvent extraction processes. Slack waxes are produced through the dewaxing of lubricating oil distillates as illustrated in Figure 2. The flow characteristics of the oil will be adversely affected and oil filters will be blocked. Depending on the source of the crude oil, the content of solid waxes can vary between 3% and 15%. If the oil temperature is below the pour point, solid waxes will begin to precipitate. Waxes must be removed from the lubricating oil, due to they cause a high pour point of the oil because of their poor solubility. In processing the residues to lubricating oils, waxes are obtained in all fractions of the vacuum distillation unit. Waxes are part of the residues of the crude oil atmospheric distillation unit because of their higher boiling ranges.
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