| Popis: |
Powdered Turkish lignites from Can, Beypazari and Elbistan areas were desulphurized by leaching in a small, stirred autoclave with aqueous alkaline (0.2 M Na2CO3, pH = 11.5) and acidic (pH = 1.3) solutions under oxygen partial pressures of 10–15 atm and at 125–175 °C. The sulphur contents of these lignites were mostly organic and the Oxydesulphurization process was not significantly effective. The total sulphur removal was slightly better under acidic conditions and pyritic sulphur removal had an optimum temperature of about 150 °C. Organic sulphur removal would increase with increased temperatures, but this would be at the expense of losses in the heating values (which was insignificant for mild conditions of this study), The treatment with any alkaline solution does not seem to be appropriate for Elbistan lignites, since a significant proportion of it (about 45 wt%) is dissolved in 0.2 M Na2CO3 solution. |
