EP 1680542 A1 20060719 - METHODS FOR PRODUCING PULP AND TREATING BLACK LIQUOR
Title (en)
METHODS FOR PRODUCING PULP AND TREATING BLACK LIQUOR
Title (de)
VERFAHREN ZUR HERSTELLUNG VON ZELLSTOFF UND ZUR BEHANDLUNG VON SCHWARZLAUGE
Title (fr)
METHODES POUR PRODUIRE DE LA PATE A PAPIER ET POUR TRAITER DE LA LIQUEUR RESIDUAIRE
Publication
Application
Priority
- GB 2004050023 W 20041103
- GB 0325578 A 20031103
Abstract (en)
[origin: WO2005045126A1] A method is provided for treating black liquor particularly derived from nonwood pulp, by heating with an alkaline earth metal oxide in a toroidal fluidised bed reactor (304) at a temperature of above 650°C. The method may be used alone or as part of a method of converting graminaceous raw material to pulp for paper or board, said method comprising (a) digesting (12) said raw material with a white liquor based on sodium hydroxide and further comprising calcium hydroxide in an amount effective to substantially convert silica of said raw material to calcium silicate; (b) recovering (14) pulp and black liquor substantially free of uncombined silica; (c) heating the black liquor in a fluidized bed reactor (304) containing calcium oxide for catalysing conversion of organic content of said black liquor to gas and for providing recovered solids including sodium values of said white liquor and calcium oxide; and regenerating said white liquor using said recovered solids. The use of the above mentioned white liquor permits treatment of wheat straw, rice straw and other high-silica materials (9) without resulting in a black liquor that is difficult to treat.
IPC 1-7
IPC 8 full level
D21C 3/02 (2006.01); D21C 11/00 (2006.01); D21C 3/22 (2006.01); D21C 11/10 (2006.01)
CPC (source: EP)
D21C 3/02 (2013.01); D21C 11/0092 (2013.01); D21C 3/226 (2013.01); D21C 11/106 (2013.01); Y02P 40/40 (2015.11)
Citation (search report)
See references of WO 2005045126A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2005045126 A1 20050519; CA 2544426 A1 20050519; CN 1886552 A 20061227; CN 1886552 B 20110126; EP 1680542 A1 20060719; GB 0325578 D0 20031203; JP 2007510814 A 20070426; RU 2006119475 A 20071227; RU 2348749 C2 20090310
DOCDB simple family (application)
GB 2004050023 W 20041103; CA 2544426 A 20041103; CN 200480034794 A 20041103; EP 04798714 A 20041103; GB 0325578 A 20031103; JP 2006537447 A 20041103; RU 2006119475 A 20041103