Лако-красочные материалы — производство

The reaction gases are cooled with liquid TiCl4 either indirectly or directly (d). Crys­tallization of the chlorides of the other components causes problems because they tend to build up on the cooling surfaces, especially the large quantities ofiron(II) and iron(III) chlorides formed on chlorination of ilmenite [2.34]. In this first stage, the reaction gases are cooled down only to a temperature (<300 °C) at which the accom­panying chlorides can be satisfactorily separated from the TiCl4 by condensation or sublimation (e).

The gas then consists mainly of TiCl4, and is cooled below 0 °C, causing most of the TiCl4 to condense (f). The small amounts of TiCl4 and Cl2 remaining in the exhaust gas (CO2, CO, and N2) are removed by scrubbing with alkali (t).