Global Patent Index - EP 2061927 A2

EP 2061927 A2 2009-05-27 - METHODS FOR CARBONATE PRETREATMENT AND PULPING OF CELLULOSIC MATERIAL

Title (en)

METHODS FOR CARBONATE PRETREATMENT AND PULPING OF CELLULOSIC MATERIAL

Title (de)

VERFAHREN ZUR CARBONATVORBEHANDLUNG UND ZERFASERUNG VON CELLULOSEMATERIAL

Title (fr)

PROCÉDÉS DE PRÉTRAITEMENT AU CARBONATE ET DE RÉDUCTION EN PÂTE DE MATIÈRE CELLULOSIQUE

Publication

EP 2061927 A2 (EN)

Application

EP 07762238 A

Priority

  • US 2007069159 W
  • US 74771706 P
  • US 82499506 P

Abstract (en)

[origin: WO2007137127A2] A method of pretreating comminuted fibrous material with sodium carbonate and then cooking the pretreated material in the presence of anthraquinone (AQ) is provided. The resulting pulp produced has a higher yield, enhanced strength, and better bleachability compared to pulp produced by prior art methods. AQ may also be introduced to the carbonate pretreatment stage. The method may further include an acid pretreatment providing further enhanced properties to the pulp produced.

IPC 8 full level

D21C 3/02 (2006.01)

CPC

D21C 3/222 (2013.01); D21C 1/04 (2013.01); D21C 3/02 (2013.01); D21C 9/147 (2013.01)

Citation (search report)

See references of WO 2007137127A3

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

DOCDB simple family

WO 2007137127 A2 20071129; WO 2007137127 A3 20090507; AR 061065 A1 20080730; AU 2007253774 A1 20071129; AU 2007253774 B2 20111006; AU 2007253774 C1 20120322; BR PI0711473 A2 20111116; CA 2651483 A1 20071129; CA 2651483 C 20130618; EP 2061927 A2 20090527; JP 2009537705 A 20091029; JP 5207191 B2 20130612; RU 2008150352 A 20100627; RU 2445414 C2 20120320; US 2007284068 A1 20071213