P. Defilippis et al., A SIMPLE TEST METHOD FOR DISTINGUISHING STRAIGHT-RUN FROM THERMAL (VISBREAKER) RESIDUES OR BITUMENS, Fuel, 74(10), 1995, pp. 1537-1539
A simple and quick test method was developed to distinguish thermally
cracked materials, especially visbreaker residues and bitumens, from u
ncracked products, such as straight-run distillation bitumens and resi
dues. The method is based on the reactivity of thermal residues and bi
tumens with phosphoric acid to form high-molecular-weight products tha
t are clearly visible as black spots in a thin film of the treated mat
erial.