Process for conjugating unconjugated unsaturation of fatty acids or esters thereof

In a process for conjugating unconjugated unsaturation in polyunsaturated lipid feedstock by contacting said feedstock with a sulfided nickel catalyst in an agitated reaction zone, the improvement which comprises:

• establishing and maintaining in said reaction zone a positive hydrogen pressure of not substantially above about 10 psig, a catalyst concentration of about 0.2 to 3% nickel by weight, and a temperature of between about 200.degree. and 250.degree. C. until substantially maximum conjugation of said feedstock occurs.