EP 1060127 A1 20001220 - PURE TITANIUM DIOXIDE HYDRATE AND A PROCESS FOR THE PRODUCTION THEREOF
Title (en)
PURE TITANIUM DIOXIDE HYDRATE AND A PROCESS FOR THE PRODUCTION THEREOF
Title (de)
REINE TITANDIOXID HYDRAT UND VERFAHREN ZU SEINER HESTELLUNG
Title (fr)
HYDRATE DE DIOXYDE DE TITANE ET PROCEDE DE PRODUCTION DE CELUI-CI
Publication
Application
Priority
- DE 19806471 A 19980217
- IB 9900272 W 19990216
Abstract (en)
[origin: DE19806471A1] Titanium dioxide hydrate which contains less than 250 ppm sulfate ions and less than 50 ppm ammonium or alkali metal ions with respect to Tio2 is obtained by producing an aqueous suspension with sulfate-containing titanium dioxide hydrate with 2 to 18 % by weight, preferably 5 to 15 % by weight solid calculated as Tio2, the sulfate content of the suspension calculated as H2SO4 is determined, 95 to 100.1 mol % of the stoichiometric amount of ammonia or alkali metal hydroxide necessary for the neutralization of the calculated H2SO4 amount is added under stirring, the suspension is filtered after stirring period of 5 to 60 minutes, preferably 10 to 30 minutes, and is washed with low-salt, preferably deionized, water and a diffusion wash with deionized water is carried out at a pressure of 3 to 5 bar is then performed.
IPC 1-7
IPC 8 full level
C01G 23/047 (2006.01); C01G 23/053 (2006.01)
CPC (source: EP KR)
C01G 23/0475 (2013.01 - EP); C01G 23/0532 (2013.01 - EP KR); C01G 23/08 (2013.01 - KR); C01P 2006/80 (2013.01 - EP KR); C01P 2006/82 (2013.01 - EP)
Citation (search report)
See references of WO 9941200A1
Designated contracting state (EPC)
BE DE ES FI FR GB IT NL
DOCDB simple family (publication)
DE 19806471 A1 19990819; AU 2293899 A 19990830; AU 742966 B2 20020117; BR 9908003 A 20011106; CA 2321250 A1 19990819; CN 1291168 A 20010411; EP 1060127 A1 20001220; JP 2002503620 A 20020205; KR 20010072550 A 20010731; MY 133018 A 20071031; NO 20004103 D0 20000816; NO 20004103 L 20001016; PL 342451 A1 20010604; WO 9941200 A1 19990819; ZA 991226 B 20000816
DOCDB simple family (application)
DE 19806471 A 19980217; AU 2293899 A 19990216; BR 9908003 A 19990216; CA 2321250 A 19990216; CN 99803046 A 19990216; EP 99902739 A 19990216; IB 9900272 W 19990216; JP 2000531403 A 19990216; KR 20007009010 A 20000817; MY PI9900511 A 19990212; NO 20004103 A 20000816; PL 34245199 A 19990216; ZA 991226 A 19990216