摘要 |
PROBLEM TO BE SOLVED: To develop a dewaxing method which uses a chlorine-free dewaxing auxiliary effective for all types (light type, heavy type, and bright stock) of wax-containing hydrocarbon oils in the solvent dewaxing method. SOLUTION: This dewaxing method uses a random or block copolymer of a 2-4C olefin and an alkyl (meth)acrylate whose alkyl group has 1-22 carbon atoms as the dewaxing auxiliary. The dewaxing auxiliary to be used in this method shows effects on all types of wax-containing hydrocarbon oils singly. Further, the dewaxing auxiliary is chlorine-free, and accordingly environmentally friendly and has no fear of the corrosion of equipments even if it should be decomposed.
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