Verfahren zur Durchführung von Reaktionen zwischen gas- bzw. dampfförmigen oder zwischen gasförmigen und festen Reaktionspartnern

1,150,432. Chemical contact apparatus. Continuous discharge mixing apparatus. FARBENFABRIKEN BAYER A.G. 13 April, 1966 [15 April, 1965], No. 16254/66. Headings B1C and B1F [Also in Division C1] In a reactor having a frusto-conical combustion chamber at one end, a first stream enters axially at a velocity up to 20m/sec., while a second stream is blown in transversely at the side of the cone with a velocity of 30-120 m/sec. through nozzles the axes of which have a transverse component and are inclined to a transverse plane at an angle of 0-25‹. The product of the specific gravity and velocity for the transverse stream is 10-100 times that for the axial stream, and the diameters of the lateral inlet nozzles 1/5- 1/20 of the distance from the nozzle outlets to the combustion chamber axis. In Fig. 1, the first stream enters at 1 and the second from conduit 6 and ring 7 by nozzles 8. A third stream of "inert" gas enters via nozzles 11, from conduit 9 and ring 10, below ring 7, and is used to prevent deposition of reaction products on the walls of the reactor. Instead of the arrangement shown, the reactor walls may be of a porous material, through which the third stream passes. The third stream may also carry an inert granular material to remove any reaction products from the walls by friction. The process may be applied to the oxidation of vaporizable metal halides to oxides such as TiO 2 for use as pigments, using O 2 , or air at temperatures of 800-2000‹C. The reactants are preheated by conventional methods, and the oxygen/Ti Cl 4 , ratio may be 1-1.3. Oxygen may be preheated by mixing with CO before entry into the reaction chamber. Modifying agents such as Al 2 O 3 , ZrO 2 , SiO 2 , steam, and compounds of alkali metals and alkaline earth metals may be included in the reaction mixture as a powder or aerosol. The reaction mixture may be seeded by a variety of methods such as 0.5-5% of TiO 2 made by reaction of a partial stream of TiCl 4 with steam, oxides of N, O 2 , 0.5-5% of SiO 2 made from SiCl 4 with steam, O 2 , or oxides of N, the product of reacting a mixture of TiCl 4 and SiCl 4 with compounds of alkali or alkaline earth metals, or 0.5-5% of the product obtained by reducing TiCl 4 with H 2 .