CaO-Ca binary system

The COt Acceptor Gasification Process is discussed in light of the required properties of the CaO acceptor. Equilibrium data for reactions involving the CO% and sulfur acceptance and for sulfur rejection jit the process requirements. The kinetics of the reactions are also sufficiently rapid. Phase equilibrium data in the binary systems CaO-Ca(OH)t and Ca(OH)jr-CaCOs show the presence of low melting eutectics, which establish operability limits for the process. Data were obtained in a continuous unit which duplicates process conditions which show adequate acceptor life. Physical strength of many acceptors is adequate, and life is limited by chemical deactivation. Contrary to earlier findings both limestones and dolomites are equally usable in the process. Melts in the Ca(OH)2-CaC03 system are used to reactivate spent acceptors. [Pg.149]

Melt Formation. The binary system CaO-Ca(OH)2 was studied to determine the equilibria in the following reactions ... [Pg.154]

Melt Formation. The equilibrium steam pressures for Reactions 12, 13, and 14 are shown in Figure 8. The eutectic in the binary system CaO-Ca(OH)2, is at 1454°F. and corresponds to the point where curves... [Pg.163]

The phase equilibrium diagrams for the two binary systems CaO-Ca(OH)2 and Ca(OH)2-CaC03 are shown in Figures 9 and 10, respectively. The latter system particularly shows a remarkably low melting eutectic at 1180°F. At this temperature the steam pressure from Equation... [Pg.164]

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