公开(公告)号：US20220194812A1

公开(公告)日：2022-06-23

申请号：US17688913

申请日：2022-03-08

申请人： VENATOR GERMANY GMBH

发明人： JUERGEN PHILIPP KASTNER ,  UWE ROSIN

IPC分类号： C01G23/08 ,  C01G23/053 ,  C09C1/36 ,  C01G23/047

摘要： A process for producing a particulate TiO2 includes supplementing metatitanic acid with an alkali compound in a quantity of 1200 ppm to 2400 ppm of alkali, with a phosphorus compound in a quantity of 0.1 wt.-% to 0.3 wt.-% by weight of P, expressed as phosphorus, and with an aluminum compound in a quantity of 1 ppm to 1000 ppm of Al, expressed as Al, to obtain a mixture. The quantity of the alkali compound, of the phosphorus compound, and of the aluminum compound are with respect to the TiO2 content. The mixture is calcined at a constant temperature of 940° C. to 1020° C. until a numerical fraction X50 of TiO2 has a primary crystallite size of at least 200 nm, to obtain a calcined mixture. The calcined mixture is cooled to obtain a cooled calcined mixture. The cooled calcined mixture is grinded to obtain the particulate TiO2.

公开(公告)号：US20190248672A1

公开(公告)日：2019-08-15

申请号：US16316352

申请日：2017-06-21

申请人： VENATOR GERMANY GMBH

发明人： JUERGEN PHILIPP KASTNER ,  UWE ROSIN

IPC分类号： C01G23/08 ,  C01G23/053 ,  C09C1/36

CPC分类号： C01G23/08 ,  C01G23/047 ,  C01G23/0532 ,  C01P2002/60 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/12 ,  C01P2006/14 ,  C01P2006/64 ,  C01P2006/80 ,  C09C1/3669 ,  C09C1/3676 ,  C09C1/3684

摘要： A particulate TiO2 includes a TiO2 content of at least 99 wt.-%, an anatase content of at least 98 wt.-%, a primary crystallite size X50 of at least 200 nm, a numerical fraction of TiO2 with a primary crystallite size of at most 100 nm of at most 10%, a specific surface area of at most 8 m2/g as determined by BET measurements, 1200 ppm to 2400 ppm of alkali with respect to the TiO2 content, an Al content of 1 ppm to 1000 ppm, expressed as Al and with respect to the TiO2 content, a weight ratio of Al2O3 to Nb2O5 of from 0.17 to 0.74, and 0.1 wt.-% to 0.3 wt.-% of P, expressed as phosphorus and with respect to the TiO2 content.