Tymochtee dolomite

Some results from activity testing in the continuous unit are given in Figure 14. Analyses of the stones used are given in Table III. The conditions of the runs were all similar to those given for the particular case of Tymochtee dolomite shown in Table VI. 

The Tymochtee dolomite in the continuous unit showed essentially indistinguishable results from that of the Greenfield dolomite, and therefore data for the latter are not given in Figure 14. The Greenfield dolomite had activities of 0.76 and 0.52 after 20 cycles in batch and continuous units, respectively. The more rapid deactivation rate in the continuous unit is clear, although the reason is not presently understood. 

Acceptor 16 X 28 mesh Tymochtee dolomite Char 35 X 150 mesh devolatilized lignite char System pressure, 20 atm. 

The calculated equilibrium activities for the Tymochtee dolomite at various makeup rates of fresh acceptor are given in Table VII. At the make-up rate assumed in the feasibility study of 2%, the equilibrium activities are substantially lower than the value of 0.70 given—i.e., 0.32 and 0.43, respectively, for the cases where char combustion was and was not effected in the regenerator. 

---