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nature : or contact clay refining. After solvent refining and solvent dewaxing of distillate oil, still contain a small amount of plastic, non-ferrous material and the residual solvent, usually supplemented with activated clay refining, lubricants to improve the color and oxidation stability, anti-emulsification, insulation and reduce carbon residue so. Hydrogenation is gradually refined supplementary or alternative partial substitution of refined white clay added. Two current technology is still in coexistence, especially for some special oil must be refined using clay.
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