Diesel decarbonization via effective catalytic Co-hydroprocessing of residual lipids with gas–oil

• WCO co-processing with petroleum fractions renders high quality hybrid fuels.
• WCO addition to HAGO hydrotreatment does not limit targeted reactions.
• WCO integration to HAGO hydrotreatment improves conversion and diesel yields.
• 5–10% WCO integration is proposed, requiring up to 6.5% additional H2.

This study focuses on evaluating the effect of residual lipid co-hydroprocessing with a heavy petroleum fraction, towards the production of a hybrid diesel fuel of increased sustainability. Firstly, the effect of Waste Cooking Oil (WCO) co-hydroprocessing with Heavy Atmospheric Gas Oil (HAGO) at different relative ratios (100/0, 95/5, 90/10, 85/15, 80/20 and 70/30 v/v) was evaluated in terms of diesel quality. The experimental results showed explicitly that the addition of WCO did not limit any hydroprocessing reactions targeted. Particularly WCO integration led to a significant diesel content increase which reached 13% for the highest WCO content feedstock (30% v/v), while increasing hydrogen consumption. The study showed that co-hydroprocessing of residual lipids within a refinery can provide an effective and no-risk pathway for integrating residual liquid biomass in transportation fuels, without significant capital investments, while the addition of 5–10% v/v WCO in the hydroprocessing feedstock is considered optimal in terms of H2 additional requirements (∼6.5%), product quality and WCO availability.

Figure optionsDownload as PowerPoint slide