Production of Asphalt Binder from Brazilian Pre-Salt Low-Carbon Footprint Crude Oil
摘要
The carbon intensity of crude oils ranges from 4 to 50 g CO2 eq./MJ, averaging 12 g CO2 eq./MJ. Brazilian pre-salt oil have a much lower footprint (1.6 g CO2 eq./MJ) due to productive wells and CCUS (Carbon Capture, Utilization, and Storage) technology. The vacuum residue, used as a feedstock for asphalt binder, contains fewer asphaltenes and high content of waxes, not allowing that the pre-salt vacuum residue directly fits into the Brazilian specification. To leverage the low carbon footprint in asphalt binder production, it is recommended that deasphalting residue and vacuum residue obtained at elevated cut temperatures be blended with refinery fractions, primarily rich in aromatic hydrocarbons. This process increases asphaltene content and reduces wax concentration, improving density and viscosity. Additionally, further reduction of the carbon footprint is possible by incorporating renewable oils derived from vegetable and tall oils to dilute pre-salt residues. The resulting bio-based binder complies with Brazilian specifications and demonstrates high quality.