Pyrolysis of petroleum residues

The scientific impact of Francisco Rodríguez-Reinoso in carbon research and beyond

“…In this context, it was found that the evolution of material soluble in heptane (HS), toluene (TS) and methylpyrrolidone, NMP, (NMPS) and insoluble in NMP (NMPI), followed a mechanism of consecutive reactions: HS4TS4NMPS4NMPI (Fig. 5), with calculated activation energies of 240 ± 20 kJ mol-1 [61].…”

Sinterability enhancement in semicokes obtained by controlled pyrolysis of a petroleum residue

“…Pyrolysis at 480 8C and 1.0 MPa results in a fast formation of mesophase, the semicoke being almost fully anisotropic, 98%, for a soak time of 3 h. This material has a high toluene-and NMP-insoluble content and low b-resin and volatile matter contents. It is difficult, at 480 8C, to control the amount and composition of light compounds necessary to provide self-sinterability to the powders [21] due to the fast rate of these reactions [22]. Furthermore, small deviations in the temperature programme results in significant variations in composition.…”

Anisotropy and mesophase formation towards carbon fibre production from coal tar and petroleum pitches: a review

“…10 Ultimately, it is the chemistry of the pyrolysis system that controls the structure and properties of resultant semicokes/ cokes/ carbons, but, the chemistry, in turn, is a function not only of the chemical properties of the original feedstocks, but also of the physical parameters incorporated into the system, such as heating rate, soak time, final reaction temperature and pressure within the system. 11 Dependent upon how the pyrolysis system is constructed, e.g.…”

“…Pyrolysis chemistry ultimately leads to the formation of mesogens, which involves the simultaneous dehydrogenation, dealkylation, condensation and aromatization of the molecules of the feedstock, together with some molecular fragmentation and regrowth. 10 …”