Definition - What does Asphalt-Base Oil mean?
Asphalt-Base Oil is crude oil that has asphaltum in large amounts making it highly viscous and heavy in nature. Such type of crude oil contains 2% less wax in the residue obtained after the distillation process. This crude oil is sticky and in a semi-solid or liquid state. Asphalt-base oil is separated from the crude oil through a distillation process whereby it is removed from the higher-boiling hydrocarbons. The byproducts of such crude oil are bitumen, petroleum asphalt or asphalt.
Petropedia explains Asphalt-Base Oil
Crude oil is a combination of naturally occurring hydrocarbons and other compounds such as nitrogen, oxygen and sulfur. The composition of crude oil depends on the percentage of these elements. Thus, crude oil can be classified in three major categories – paraffin base, asphalt base and naphthene base. The other base is mixed base. Asphalt-base oil is produced in large quantities when heavy crude oil is processed in oil refineries. This heavy crude oil is rich in sulfur, asphaltum and asphaltene hence its API gravity is lower than 10 degrees. When the crude oil is processed, it yields low value products such as asphalt, bitumen, coal tar and paraffin wax, etc. These petroleum products are generally referred as residue from vacuum distillation wherein heavy crude oil is further sent over for a de-asphalting process which generates asphalt. Asphalt-base oil is then processed for further use in road construction and roofing shingles.