Evaluation of tars produced in carbonisation
This project studies the effects on the qualities of tars and pitches of changing temperatures in the processes of carbonisation and pre-heating charging of a complex industrial mixture of coals and of a single-quality coal. Both tars and pitches were characterised by conventional methods, and by cutting the heating gas supply one hour before charging, the amount of ashes was considerably reduced and densities increased. The chemical composition alterations were shown by extrography. By raising temperatures, aromatic hydrocarbons in tars decreased while polycyclic aromatic hydrocarbons (PAH) increased. Pitches increased their heteroaromatic components and decreased in PAHs. The 1H-RMN and IR-TF-RMN techniques applied showed differences in tars and pitches. By raising temperatures the proportion of Har increased while that of Hal decreased, but at 1120 C and above, proportions remained constant, HoH decreased and IQ materials showed a higher proportion of quaternary carbons.
Bibliographic Reference: EUR 14321 ES (1993) 100 pp., MF, ECU 4
Record Number: 199310750 / Last updated on: 1994-11-29
Original language: es
Available languages: es