TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The Ag(I) salt is silver tetrafluoroborate, silver acetate, silver nitrate and/or silver(I) fluoride.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The method-1 further comprises: a step of pretreating a lipid-containing material via hydrolysis to yield an initial lipid mixture comprised largely of fatty acids; a step of pretreating a lipid-containing material via esterification to give an initial lipid mixture comprised largely of fatty esters; the pre-steps including (i) pretreating a lipid-containing material to give a pretreated lipid mixture comprised largely of free lipids, and (ii) subjecting the pretreated lipid mixture to fractional crystallization to give an initial lipid mixture comprised largely of unsaturated free lipids; a step of hydrotreating the first and second lipid product to yield first and second hydrotreated products, respectively; and a step of blending the first and second lipid products with a fluid type consisting of biolubricants, biofuels, conventional petroleum lubricants and/or conventional petroleum fuels. The step of inducing involves an agitation means to enhance interfacial contact between the first and second primary phases. The step of separating involves drawing off of one phase under conditions substantially devoid of agitative forces. The step of removing the lipids from the first extracted mixture to yield a first lipid product enriched in unsaturated lipids comprises the substeps of (a1) extracting the lipids from the first extracted mixture with a second organic solvent to give a first lipid extracted product and a spent Ag(I) salt solution, and (b) distilling the first lipid extracted product to give the first lipid product. The Ag(I) salt and the ionic liquid of the spent Ag(I) salt solution are recycled. The second organic solvent is recycled subsequent to the step of distilling. The lipids are substantially isolated from the second lipid product via a distillation process to yield a second lipid product having an average unsaturation number that is less than that of the initial lipid mixture and a spent first organic solvent. The first organic solvent is recycled. The method-1 includes a step of treating a lipid-containing precursor material to give an initial lipid mixture comprising largely of free lipids, prior to the steps (a)-(e). Preferred Components: The lipids in the initial lipid mixture are fatty esters, fatty acids, triglycerides, diglycerides and/or monoglycerides. The ionic liquid is 1-butyl-3-methylimidazolium-based ionic liquid having a counter ion consisting of tetrafluoroborate, hexafluorophosphate and/or chloride. The first organic solvent is alkanes, arenes, alkenes, ethers, halogenated solvents and/or cycloalkanes. EXAMPLE - A feed of initial mixture (15000 kg/day), comprising 70% of oleic acid and 30% of linoleic acid, was mixed with heptane in extraction unit, and the resulting solution was treated with 1-butyl-3-methylimidazolium tetrafluoroborate containing 5 wt.% of silver tetrafluoroborate. After sufficient extraction time, the heptane phase (enriched in oleic acid relative to the initial mixture) was separated from the ionic liquid phase (enriched in linoleic acid relative to the initial mixture), and an oleic acid-enriched product was obtained by removing the heptanes in distillation column. The ionic liquid phase (enriched in linoleic acid relative to the initial mixture) was sent to regeneration unit where it was mixed with 1,3-hexadiene. The hexadiene extracted the fatty acids from the ionic liquid phase to yield a regenerated ionic liquid phase and a hexadiene phase enriched in linoleic acid. The hexadiene phase was then processed in distillation column to give a bottoms product that is enriched in linoleic acid relative to the initial mixture. The oleic acid-enriched products (11850 kg/day) obtained after extraction/enrichment contained 85% oleic acid. The bottoms product (3150 kg/day) contained 13% of oleic acid.