Due to the not adequate cold flow properties of the hydrogenated product (straight run heavy gas oil fraction and increased
n-paraffin content via the hydrogenation of the triglyceride and fatty acid content) a second, isomerisation step can be necessary, if the produced bio gas oil containing gas oil fraction is utilised in cooler than tropical or Mediterranean climates. During this step, the high n-paraffin content of the intermediate feedstock is converted to isoparaffins, which have lower pour points, but slightly lower cetane number values, too. Isomerisation was carried out on a Pt/SAPO-11 isomerisation catalyst