Though it is more customary to refine asphalt, various plants all around the world collect asphalt or bitumen directly from deposits, such as the Dead Sea. The entire procedure can be divided into three stages: extraction, recovery, and solvents.


There are three basic ways of extracting asphalt: centrifuge, reflux, and vacuum. When it comes to dissolving the binder and retaining its suppleness, all three have varying degrees of effectiveness. For example, the centrifuge method is a somewhat safer extraction process that is also successful enough for most asphalt binder use cases around the world.


The primary distinctions between the three ways of asphalt extraction are the use of heat, the type of solvent used, and the method of processing the mixture. Because of their simplicity and ease of use, centrifuge and reflux procedures are more commonly utilized than vacuum methods.


Another method, the US Strategic Highway Research Program, or SHRP method, is an improvement on these two.


When more than one extraction process is used on the same batch of bitumen, a more comprehensive extraction is feasible. The consistency of outcomes is currently unmeasured, and user safety is a top priority for all sorts of asphalt extraction procedures. Scientists have been designing and testing safer extraction technologies that are partially or completely automated, but none have seen the light of day, or at least general use, thus far.