By Harald Schafer

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2). This method of tungsten transport was modi­ fied by van Arkel<6>46) and further developed. Molybdenum also may be transported to the hot wire via its chloride. <6>47) For most metals, however, the chlorides are too stable to be used in a transport reaction. 5 Cl2 (5 Cl) = MoCl5(i7); (400 -> 1400°C); Gl (3) In such cases the iodide method developed by van Arkel and de Boeri5*6*48*49) may be suitably used. 1 TRANSPORTABLE SOLID SUBSTANCES practical importance, used t o some extent on a larger scale.

If the chemical reaction is written in the conventional way with the solid substance on the left side, then the entropy of reaction is positive. e. from T% -> T±. Next, the carbon transport according to the Boudouard reaction may be mentioned. This constitutes a special case in which the speed of the heterogeneous reaction in the temperature range used is C + C0 2 = 2CO; {1000->600°C;R ^ 1600 - > < 400°C; Gl (8) small (cf. 2), so that in the diffusion tube it is the rate of reaction, and not the diffusion, which decisively determines the transport effect.

Each curve gives Δ Ρ = PB(2) — -PB(I) (as a measure of the transport effect) as a function of ΔΗ0, holding AS° constant. 32 2 Experimental and Theoretical Principles Rules may be composed for transport involving heterogeneous equilibria. These rules may be either directly plausible or become apparent with the aid of Fig. <10) These are valuable for a quick orientation. * (2) A reaction with an extreme equilibrium position gives no measurable solid material transport (Fig. 11, large absolute value of ΔΗ0).

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