Co-Processing of Straight Run Gas Oil-Rapeseed Oil Mixture Using Sulfide NiMo Catalyst on Zeolite-Containing Support

Abstract

Behavior of the sulfide NiMo catalyst on an alumina support containing SAPO—11 silicoaluminophosphate (NiMo/SAP-Al₂O₃) in the hydroprocessing of a mixture of a straight run gas oil (SRGO) and rapeseed oil (RO) was studied under a pressure of 5.0 MPa and liquid hourly space velocity of 1.5 h⁻¹. The effect of temperature on the properties of the products produced in the hydroprocessing of a mixture with 30 wt % RO and 70 wt % SRGO in the presence of the NiMo/SAP-Al₂O₃ catalyst and a double-bed catalytic system containing layer-by-layer loaded Mo/Al₂O₃ and NiMo/SAP-Al₂O₃ sulfide catalysts. It was found that the experimental conditions provide a full conversion of oxygen-containing compounds and reduction of the content of sulfur to less than 10 mg kg⁻¹. Raising the temperature from 330 to 380°C leads to an increase in the conversion of alkanes formed due to the hydrodeoxygenation of rapeseed oil and to lowering of the cloud point of the hydroprocessing products by approximately 15°. Possible reasons for the differences in behavior between the systems under study: a high conversion of C₁₇, C₁₈ alkanes is reached in the presence of the NiMo/SAP-Al₂O₃ catalyst, whereas the double layer Mo/Al₂O₃ + NiMo/SAP-Al₂O₃ system provides a more effective course of the reactions in which aromatic hydrocarbons are hydrogenated.