Global Patent Index - EP 1047638 A1

EP 1047638 A1 2000-11-02 - METHOD FOR PRODUCING TiO 2? ACCORDING TO THE SULFATE METHOD

Title (en)

METHOD FOR PRODUCING TiO 2? ACCORDING TO THE SULFATE METHOD

Title (de)

VERFAHREN ZUR HERSTELLUNG VON TiO 2? NACH DEM SULFATVERFAHREN

Title (fr)

PROCEDE DE PREPARATION DE TiO 2? SELON LE PROCEDE AU SULFATE

Publication

EP 1047638 A1 (DE)

Application

EP 98966647 A

Priority

  • DE 19800881 A
  • EP 9808341 W

Abstract (en)

[origin: DE19800881A1] The moist metatitanic acid filter cake is passed into a drier for pre-drying before entry into the furnace for calcining. The cake is first dewatered to between 55 and 65% moisture. The pre-drying at 100 to 160 deg C brings the residual moisture level to between 5 and 25%. The waste gas from the calcining furnace is used to heat the drier. The pre-dried filter cake has a mean particle size of from 0.1 to 4 mm immediately before entry into the calcining furnace.

IPC 1-7 (main, further and additional classification)

C01G 23/053; C01G 23/08

IPC 8 full level (invention and additional information)

C01G 23/053 (2006.01); C01G 23/08 (2006.01)

CPC (invention and additional information)

C01G 23/0532 (2013.01); C01G 23/08 (2013.01); C01P 2006/82 (2013.01)

Citation (search report)

See references of WO 9936362A1

Designated contracting state (EPC)

BE DE ES FI FR GB IT

EPO simple patent family

DE 19800881 A1 19990715; EP 1047638 A1 20001102; PL 341766 A1 20010507; SI 20322 A 20010228; WO 9936362 A1 19990722

INPADOC legal status


2002-03-27 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20010917

2001-06-20 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20010504

2001-03-21 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: SACHTLEBEN CHEMIE GMBH

- Ref Legal Event Code: RAP1

2000-11-02 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000814

2000-11-02 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): BE DE ES FI FR GB IT