Device for the manufacture of fine particle size titanium dioxide

Abstract

Abstract A PYROGENIC TIO2 MATERIAL IS PRODUCED BY THE VAPOR PHASE REACTION OF GASEOUS TITANIUM TETRACHLORIDE WITH OXYGEN IN THE PRESENCE OF HOT COMBUSTION GASES PRODUCED BY COMBUSTION OF CARBON MONOXIDE AND OXYGEN WHEREIN ALL OF THE OXYGEN REQUIRED FOR THE REACTION IS INTRODUCED IN ADMIXTURE WITH CARBON MONOXIDE, THE GASEOUS TICL4 BEING INTRODUCED INTO THE REACTION CHAMBER AS ONE OR MORE ROTATING JET STREAMS EACH SURROUNDED BY A MANTLE OF GASEOUS CARBON MONOXIDE WHICH REACTS WITH THE SURROUNDING HOT COMBUSTION GASES PLUS FREE OXYGEN TO PRODUCE A SPATIALLY FIXED CIRCULAR FLAME AT A PREDETERMINED DISTANCE BELOW THE POINT OF INTRODUCTION OF EACH ROTATING STREAM OF GASEOUS TIC14 AS A CONSEQUENCE OF WHICH THE REACTION OF THE GASEOUS TIC14 AND FREE XYGEN ALWAYS TAKES PLACE AT SUBSTANTIALLY THE SAME LOCATION I.E. REACTION ZONE IN THE REACTION CHAMBER AND OWING TO THE ROTARY MOVEMENT OF EACH TIC14 JET STREAM THE REACTION ZONE IS RELATIVELY SHORT AS A CONSEQUENCE OF WHICH THE RESIDENCE TIME OF THE TIO2 PARTICLES FORMED THEREIN IS SHORT AND OF SUBSTANTIALLY EQUAL DURATION THEREBY PRODUCING A UNIFORM FINE-GRAINED PRODUCT. THE MEANS USED FOR REACTING THE GASEOUS COMPONENTS IN THE MANNER HEREINABOVE DESCRIBED COMPRISES APPARATUS DESIGNED TO INTRODUCE THE GASEOUS TIC14 INTO THE UPPER END OF A REACTIONCHAMBER THROUGH ONE OR MORE CONCENTRIC TUBE FEED PIPES MOUNTED IN A GAS PERMEABLE PLATE HAVING A MULTIPLICITY OF GAS PASSAGES SURROUNDING THE TIC14 FEED PIPES THROUGH WHICH PASSAGES MIXTURES OF CO AND OXYGEN AT REACTING TEMPERATURE ARE INTRODUCED INTO THE REACTION CHAMBER TO PROVIDE HOT COMBUSTION GASES PLUS FREE OXYGEN FOR EFFECTING THE REACTION OF THE GASEOUS TIC14 AND OXYGEN. THE UPPER END OF THE REACTION CHAMBER IS ALSO PROVIDED WITH INLET PIPES FOR INTRODUCING A COLD GAS TANGENTIALLY INTO THE CHAMBER FOR SWEEPING THE WALLS FREE OF TIO2 DEPOSITS.

Inventors

• 👤 Giovanni Hilgers
• 👤 Gerhard Hitzemann
• 👤 Achim Kulling

Bibliographic Details