On the separation of TiCl 4 from AlCl 3
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4. K. Grjotheim: Kgl. Norske Videnskab. Selskabs Skrifter, 1956, no. 5, pp. 1-90. 5. S. Senderoff and G. W. Mellors: J. Electrochem. Soc., 1967, vol. 114, pp. 556-60:
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On the Separation of TiCI4 from AICI3 S00
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Fig. 2 - - P h a s e diagram of the LiCI-K3MoCI~ system.
NaF-Na3A1F6 system, used the known heat of fusion of Na3A1F6 in order to postulate a mechanism of dissociation of cryolite that most closely agrees with the experimentally determined liquidus line. Unfortunately, the heat of fusion of K3MoC16 has not been reported, and the liquidus line of the binary system K3MoC16-MoC13 is not accurately known. It has been assumed, 5 with reasonable justification, that potassium hexachloromolybdate dissociates upon melting according to the reaction K3MoCI6 -- MoCI63- + 3K ยง
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creating the molybdenum-bearing complex ion, MoC163-, which is electroreduced to molybdenum metal. Figure 2 shows the phase diagram of the LiC1-K3MoCI6 system which forms a simple eutectic at 10.5 mole pct K3MoC16 and 483 ~ There are no other reports in the literature for this system. As shown in Figure 2, on the composition interval from 25 to 75 mole pct K3MoC16 it was not possible to detect a thermal arrest at the eutectic temperature. Furthermore, at temperatures below the eutectic, the cooling curves showed evidence of other phase transformations. However, these results were inconclusive and cannot be interpreted. Similar problems were encountered by Drobot and Sapranova in the KC1-MoC13 system. 3 This work was supported by the Dow Chemical Company, P.O. No. 820377. REFERENCES 1. G. J. Kipouros and D. R. Sadoway: "Molybdenum coatings by Molten Salt Electrolysis," in Energy Reduction Techniques in Metal ElectrochemicalProcesses, R. G. Bautista and R. J. Wesely, eds., TMS/AIME, Warrendale, PA, 1985, pp. 471-78. 2. G.J. Janz: in Proceedings of the Third International Symposium on Molten Salts, G. Mamantov, M. Blander, and G.P. Smith, eds., The Electrochemical Society, Inc., Pennington, NJ, 1981, pp. 52-67. 3. D.V. Drobot and E.A. Sapranova: Russ. J. lnorg. Chem., 1973, vol. 18, pp. 1067-68. 232--VOLUME 17B, MARCH 1986
A. LANDSBERG and H . C . KO The anhydrous chloride reduction route to aluminum requires a chloride feed of high purity.1 In a project at the Albany Research Center of the Bureau of Mines, United States Department of the Interior, investigating the preparation of a suitable aluminum chloride feed from domestic kaolin, the separation of byproduct chlorides from aluminum chloride has been studied. An earlier publication resulting from this work indicated that ferric chloride, a coproduct of kaolin carbochlorination and a detrimental contaminant, could be separated from aluminum chloride by pressure distillation. 2 Research reported here shows that silicon chloride does not pose a serious separation problem, but that separation of titanium chloride from aluminum chloride by v
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