EP 1532313 A1 20050525 - CARBONIZING OF BLACK LIQUOR
Title (en)
CARBONIZING OF BLACK LIQUOR
Title (de)
CARBONISIERUNG VON SCHWARZLAUGE
Title (fr)
CARBONISATION DE LIQUEUR NOIRE
Publication
Application
Priority
- FI 0300532 W 20030702
- FI 20021337 A 20020708
Abstract (en)
[origin: WO2004005611A1] The invention relates to a method of pulping, wherein wood matter is cooked by using white liquor, chemical pulp is separated from resulting black liquor for further processing, and black liquor is concentrated. The concentrated black liquor from pulping is pyrolyzed in a reducing atmosphere to produce coal dust, and the resulting soda (Na2CO3), hydrogen sulphide (H2S) are recovered for recycling, and the resulting carbon oxisulphide (COS) decomposes to hydrogen sulphide in the recovery of gases, the separated soda is causticized to NaOH without the presence of Na2S, which is used in the preceding operation for the absorption of hydrogen sulphide for producing alkaline cooking liquor (white liquor).
IPC 1-7
IPC 8 full level
D21C 11/12 (2006.01)
CPC (source: EP)
D21C 11/125 (2013.01)
Citation (search report)
See references of WO 2004005611A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2004005611 A1 20040115; AU 2003238131 A1 20040123; CA 2491897 A1 20040115; EP 1532313 A1 20050525; FI 20021337 A0 20020708; FI 20021337 A 20040109
DOCDB simple family (application)
FI 0300532 W 20030702; AU 2003238131 A 20030702; CA 2491897 A 20030702; EP 03735748 A 20030702; FI 20021337 A 20020708