Bitumen froth treatment in the transition region between paraffinic and naphthenic process conditions

Bitumen froth treatment is an important process step of the bitumen recovery from oil sands by surface mining. In bitumen froth treatment, water and mineral solids are separated from the target organic bitumen product by using hydrocarbon solvents. Residual water and mineral solids in the bitumen product are detrimental to pipeline transport and downstream processes. Depending on the solvent composition, the commercial naphthenic and paraffinic bitumen froth treatment processes proceed via the oil-water separation mechanisms of coalescence and agglomeration, respectively. This study presents an experimental proof-of-concept for the existence of a transition region at ambient conditions and solvent-to-bitumen ratio of 1.6, where the advantages of the two commercial froth treatment processes may be combined and the drawbacks essentially eliminated. The bitumen product obtained in the transition region is virtually free from residual water and solids (