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4 Base fluid comparisons. 8 137 -60 Special base oils by wax isomerisation Another variant of the severe hydrotreatment process is the substitution of wax for lube distillate as feedstock. The wax recovered from conventional solvent de-waxing units is essentially a pure alkane feedstock containing a high proportion of linear alkanes. With this type of feedstock and under appropriate operating conditions, the isomerisation reaction can be made to predominate over cracking reactions. 2. 4. Synthetic polyalphaolefins are composed of a very limited number of branched alkane isomers, all having the same molecular weight and they are also completely wax-free.

G. (1990) Supply and demand of lube oil: an update of the global perspective. AM-90-27 presented at the 1990 NPRA Annual Meeting. Bull, S. and Marmin, A. (1979) Lube oil manufacture by severe hydrotreatment PO 19. 10th World Petroleum Congress, Bucharest. W. B. (1929) Chem. Metall. Eng. 36 618-619. R. A. (1986) Lube facility makes high quality lube oil from low quality feed. Oil and Gas Journal, May 19,47-51. J. M. (1979) New dewaxing process proven in operations. Oil and Gas Journal, Jan 15, 103-105.

A large proportion of an extraction plant is allocated to solvent recovery and it is an energy intensive part of the process. As mentioned above, feedstocks are run individually (so-called blocked operation) so that the required properties for each base oil grade can be met economically. If a very wide boiling range feedstock were to be solvent extracted, then at one extreme of the boiling range over-extraction occurs, while at the other end under-extraction results. The result is a poor yield of indifferent quality product.

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