CHARACTERISTICS OF K2TICL6 SYNTHESIS FROM KCL AND TICL4

Reaction characteristics were examined for synthesis of K2TiCl6 front KCl particles and TiCl4 gas. The reaction experiments were carried out exposing different sizes of KCl particles to a TiCl4 gas stream at 68 3 K. The mass gain due to formation of K2TiCl6 was measured as a funct ion of time and morphology of the product was observed by SEM and EPMA . The apparent reaction rate decreases rapidly with the progress of th e reaction, and the reaction is virtually terminated before its comple tion EPMA analysis on the particle cross-section reveals that the prod ucts are distributed around an unreacted KCl core within the particle, and the termination of the reaction takes place when the thickness of the outer product layer grows up to about 6 mu m. The reaction kineti cs are explained well on the basis of an unreacted-core model which as sumes that the rate determining step is the intra-particle TiCl4 gas d iffusion.