Co-processing the High-boiling Fraction of Bio-oil with Paraffin Oil

Abstract

Biomass fast pyrolysis oil (bio-oil) is considered to be a promising renewable liquid energy carrier. But it cannot be applied in stationary combustion engines, so upgrading is required. A considerable alternative upgrading method is hydrodeoxygenation; the heavy fraction of hydrodeoxygenated pyrolysis oil (HDO-oil) is called HHDO-oil. In this article, HHDO-oil co-processed with paraffin oil in a fixed-bed was studied under the conditions of different temperatures, different weight hourly space velocity, and also different co-processed ratio. It was found that co-processing of 20 wt% HHDO-oil with paraffin oil gave higher yields of liquid and better oil quality than that of the pure paraffin oil cracking. The optimum operating condition was at 520°C, the weight hourly space velocity was 4.0 h⁻¹, and the co-processed ratio was 20%. In this operating condition, it produced the highest yield of liquid, which was 78.65 wt%, including gasoline fraction that was 8.48 wt%, diesel fraction was 37.37 wt%, lubricant fraction was 19.03 wt%, and residue fraction was 13.78 wt%.

Keywords:

• bio-oil
• co-processing
• HHDO-oil
• paraffin oil
• pretreatment