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Solvent Based Dewaxing/Deoiling
Application: Vacuum gas oils (VGOs) are simultaneously extracted and dewaxed on a single unit to produce low-pour aromatic extracts and lube-base stocks having low pour points. Low viscosity grades (60 SUS) to bright stocks can be produced. With additional stages of filtration, waxes can be deoiled to produce fully refined paraffin waxes.
Products: Lube-base stocks having low pour points (-20°C). Very low pour point aromatic extracts. Slack waxes or low oil content waxes.
Description: Process Dynamics' integrated extraction/dewaxing technology is a revolutionary process combining solvent extraction and solvent dewaxing onto a single unit, using a common solvent system for extraction and dewaxing steps. This process offers the advantage of operating a single unit rather than separate extraction and dewaxing units; thus, reducing both capital and operating costs. The more selective solvent system produces lube-base stocks of higher quality and higher yields when compared to other technologies.
Primary solvent and warm feed are mixed together; temperature is controlled by adding the cosolvent. Filtrate or wax may be recycled for solids adjustment. Cold cosolvent is added and the slurry is filtered (or separated by other means). Solvents are recovered from the primary filtrate producing an aromatic extract. The wax cake is repulped with additional solvent/cosolvent mix and refiltered. Solvents are recovered from the filtrate producing a lube-base stock. |
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