CO-PROCESSING OF RAPESEED OIL AND GAS OIL MIXTURE TO PRODUCE DIESEL FUEL

摘要

One of the possible solutions to replace the unfavourable properties of biodiesel (FAME) is thecatalytic co-hydrogenation of the vegetable oils (triglycerides) in a mixture with gas oils in one catalytic step for theproduction of second generation biofuels. For the examination of this we used in the experiments straight run gas oilwith 0, 10, 20, 30, 50% rapeseed oil content. A NiMo/Al_2O_3 catalyst with expedient composition was used. Weinvestigated the impact of the process parameters (T=300-380°C, P=60-80 bar, LHSV=1.0 h~(-1), H_2/feed=600 Nm~3/m~3)and the vegetable oil content of the feedstocks on the yield, the physical, chemical and application properties of themain product. We obtained that both the conversion of vegetable oil and the gas oil quality improvement reactionstook place. Under the usage of the favourable process parameters (T=380°C, P=80 bar, LHSV=1.0 h~(-1),H_2/feed=600 Nm~3/m~3 and 0-20% vegetable oil content) the main properties (sulphur content: 1-8 mg/kg,polyaromatic content: 1.1-2.2%, CFPP: -2 to +2°C) of the bio-component containing diesel fuel products satisfy therequirements of standard EN 590:2009+A1:2010 (temperate zones, summer quality). The mixing of vegetable oilreduces the efficiency of desulphurization compared to the pure gas oil feedstock, because the oxygen removalreactions took place on the same active sites of catalyst as the desulphurisation reactions. We concluded that a gas oilhydrogenation plant with a slight modification may be suitable for the co-processing of vegetable oil and gas oil.