Fischer-tropsch feedstock derived haze-free base oil fractions

A method for reducing the cloud point of a Fischer-Tropsch derived fraction to below 0° C., wherein the method comprises:

• (a) combining the Fischer-Tropsch derived fraction with a solvent and a co-solvent (15) to form a treatment mixture,
• wherein the Fischer-Tropsch derived fraction comprises more than 80% of paraffins and 90% of saturates, with a solvent mixture (16),
• wherein the solvent comprises a paraffinic naphtha fraction (7), and
• wherein the co-solvent comprises one or more of methyl isobutyl ketone, methyl butyl ketone, methyl propyl ketone, and methyl isopropyl ketone;
• (b) cooling the treatment mixture to a temperature of less than −20° C. to form a wax crystal and a de-waxed mixture comprising a portion of the solvent and a de-waxed oil;
• (c) separating the wax crystal from the de-waxed mixture to form a separated de-waxed mixture comprising the portion of the solvent and the de-waxed oil;
• (d) distilling the separated de-waxed mixture to form a distilled solvent and a de-waxed oil, wherein the de-waxed oil comprises a cloud point below 0° C.