Process for converting heavy fischer tropsch waxy feeds blended with a waste plastic feedstream into high VI lube oils

A process for preparing a lubricating base oil comprising the steps of:

• (a) fractionating a solid paraffinic wax obtained from a Fischer-Tropsch synthesis and recovering a 1000° F.° fraction and a 1000° F.+ wax fraction;
• (b) blending a waste and/or virgin polyethylene and the Fischer-Tropsch 1000° F.+ wax fraction wherein the polyethylene and wax fraction are admixed in an amount ranging from about 5-95 wt. % of polyethylene and 95-5 wt. % of the wax fraction;
• (c) heating the blend in a heating unit maintained at a temperature of about 150° C. to about 350° C.;
• (d) passing the blend to a pyrolysis reactor maintained at a temperature of about 450° C. to about 700° C. and an absolute pressure of at least 1 bar;
• (e) passing the effluent from the pyrolysis reactor to a separator;
• (f) recovering at least a middle fraction and a heavy liquid fraction from the separator;
• (g) admixing the heavy liquid fraction from the separator with the 1000° F.− fraction obtained in step (a) to form a liquid mixture;
• (h) forwarding the liquid mixture from step (g) to a hydrotreating unit;
• (i) passing the effluent from the hydrotreating unit to a catalytic isomerization dewaxing unit;
• (l) passing the effluent from the isomerization dewaxing unit to a fractionator;
• and
• (k) recovering a lubricating base oil.

A process for preparing a lubricating base oil which comprises:

• (a) recovering a heavy wax from a Fischer-Tropsch process;
• (b) forwarding the wax, optionally blended with a waste and/or virgin polyolefin, to a heating unit maintained at a temperature sufficient to liquify the wax;
• (c) feeding the heated wax to a pyrolysis unit;
• (d) pyrolyzing the wax;
• (e) recovering an effluent from the pyrolysis unit;
• (f) processing the effluent in a separator to form at least a heavy liquid fraction;
• and,
• (g) treating the heavy liquid fraction to produce a lubricating base oil.