in neat (no solvent) byproducts: coal, SiCl4; half continuous process with vertical silica tube by passing of Cl2 from below and addition of ZrC from top; damping of overheating reaction by addition of ZrSiO4 or ZrSiO4/C; elimination of residue (coal with 4.3percent Zr) in 24 h;; condensation in Ni-vessel at >80°C to separate SiCl4;;
in neat (no solvent) calcination of purified ZrO2 in CCl4/Cl2 at 550-600°C in a porcelain tube, covered with asbestos, in iron tube; precipitation of the product at the colder part of the tube;; sublimation of ZrCl4 in a slow stream of gas at 140°C;;
参考文献
Journal of the Chemical Society, , vol. 125, p. 1252 - 1261
char coal in neat (no solvent) briquetting with a tenfold excess of char coal; heating the dry briquets at 600-650°C in stream of dry Cl2;; condensation of ZrCl4 in spherical condenser;;
