Global Patent Index - EP 1092058 A1

EP 1092058 A1 2001-04-18 - METHOD FOR SELECTIVELY DELIGNIFYING LIGNOCELLULOSIC MATERIALS

Title (en)

METHOD FOR SELECTIVELY DELIGNIFYING LIGNOCELLULOSIC MATERIALS

Title (de)

VERFAHREN ZUR SELEKTIVEN DELIGNIFIZIERUNG LIGNOCELLULOSISCHER MATERIALIEN

Title (fr)

PROCEDE DE DELIGNIFICATION DE SUBSTANCES LIGNO-CELLULOSIQUES

Publication

EP 1092058 A1 (EN)

Application

EP 99955305 A

Priority

  • US 9912099 W
  • US 8765898 P
  • US 32095699 A

Abstract (en)

[origin: WO9963149A1] Disclosed is a method for delignifying lignocellulosic materials by first treating the material with an alkaline solution in the presence or absence of anthraquinone, and then exposing the material to a polyoxometalate. Inclusion of the alkaline pretreatment step allows delignification to take place at high efficiency and affords high residue yields and viscosities.

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

D21C 1/10; D21C 3/02; D21C 3/04; D21C 3/20; D21C 3/26

IPC 8 full level (invention and additional information)

D21C 1/10 (2006.01); D21C 3/00 (2006.01); D21C 3/02 (2006.01); D21C 3/04 (2006.01); D21C 3/20 (2006.01); D21C 3/22 (2006.01); D21C 3/26 (2006.01); D21C 9/10 (2006.01)

CPC (invention and additional information)

D21C 3/006 (2013.01); D21C 3/02 (2013.01); D21C 3/222 (2013.01); D21C 3/26 (2013.01); D21C 9/1063 (2013.01)

Designated contracting state (EPC)

DE ES FI GB IT PT SE

EPO simple patent family

WO 9963149 A1 19991209; WO 9963149 A8 20000427; BR 9910866 A 20011030; CA 2332897 A1 19991209; EP 1092058 A1 20010418; EP 1092058 A4 20020320; JP 2002517621 A 20020618

INPADOC legal status


2004-11-17 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20040518

2002-10-09 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020822

2002-03-20 [A4] SUPPLEMENTARY SEARCH REPORT

- Effective date: 20020201

2002-03-20 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A4

- Designated State(s): DE ES FI GB IT PT SE

2002-03-20 [RIC1] CLASSIFICATION (CORRECTION)

- Free text: 7D 21C 9/10 A

2001-04-18 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010102

2001-04-18 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE ES FI GB IT PT SE