公开(公告)号：EP2129626B1

公开(公告)日：2019-01-23

申请号：EP07856539.7

申请日：2007-12-11

申请人： KRONOS INTERNATIONAL, INC.

发明人： GRUBER, Rainer ,  MALCHAREK, Frank

IPC分类号： C01G23/07 ,  C09C1/36 ,  C01G23/047

公开(公告)号：EP2129626A2

公开(公告)日：2009-12-09

申请号：EP07856539.7

申请日：2007-12-11

申请人： KRONOS INTERNATIONAL, INC.

发明人： GRUBER, Rainer ,  MALCHAREK, Frank

IPC分类号： C01G23/07 ,  C09C1/36

CPC分类号： C01G23/047 ,  C01G23/07

摘要： The invention relates to the production of titanium dioxide by oxygenating titanium tetrachloride and then cooling the titanium dioxide particle-gas mixture while adding scouring particles in a cooling section, the gas-particle flow being made to rotate. According to the invention, the titanium tetrachloride is introduced into the axial oxygen-containing flow on the cross-sectional plane of the tubular reactor, but not in the radial direction. The flow velocity of the oxygen-containing gas exceeds 20 m/s, particularly reaching at least 40 m/s. The method according to the invention makes it possible to effectively remove accumulated TiO2 from the internal wall and the cooling section of the tubular reactor, thus increasing the cooling performance, and produce a TiO2 pigment which has a narrow grain size distribution.