Process for purifying feedstock comprising fatty acids

A process for purifying renewable feedstock comprising at least one fatty acid, wherein said process comprises the steps,

• pretreating the renewable feedstock comprising at least one fatty acid at a temperature of 90-145° C. and under a pressure of 0.1-10 bar (abs), with an aqueous medium comprising an acid selected from sulfuric acid and C1-C10 organic acids, wherein the ratio of the renewable feedstock to the aqueous medium is from 1:5 to 5:1, to provide a first-stage aqueous stream and a first-stage oil stream;
• and
• treating the first-stage oil stream with water, at a temperature from 150 to 210° C., under a pressure from 5 to 70 bar (abs), where the ratio of the first-stage oil stream to the water is from 1:5 to 5:1, respectively, to provide a first stream comprising water and a second stream comprising oil, and the second stream is obtained as purified renewable feedstock.