Global Patent Index - EP 4230791 A1

EP 4230791 A1 20230823 - A BLEACHING PROCESS

Title (en)

A BLEACHING PROCESS

Title (de)

BLEICHVERFAHREN

Title (fr)

PROCESSUS DE BLANCHIMENT

Publication

EP 4230791 A1 20230823 (EN)

Application

EP 22157484 A 20220218

Priority

EP 22157484 A 20220218

Abstract (en)

A bleaching process of pulp is disclosed comprising performing a delignification of the pulp by carrying out in a following sequence: an enzymatic treatment step comprising contacting the pulp with a glycoside hydrolase family GH11 xylanase enzyme at a pH of at least 9.5 and a temperature of at least 85 °C, an oxidation step wherein a bleaching agent is added, an alkaline extraction step wherein an alkaline agent is added, and recovering bleached pulp, wherein the GH11 xylanase enzyme has an ability to cause at least 20 % reduction in viscosity of a xylan-containing mixture at 90°C and pH 10.5, compared to the same mixture without any xylanase enzyme.

IPC 8 full level

D21C 5/00 (2006.01); D21C 9/10 (2006.01); D21C 9/147 (2006.01); D21C 9/153 (2006.01); D21C 9/16 (2006.01); D21H 17/00 (2006.01)

CPC (source: EP)

D21C 5/005 (2013.01); D21C 9/10 (2013.01); D21C 9/147 (2013.01); D21C 9/153 (2013.01); D21C 9/16 (2013.01); D21H 17/005 (2013.01)

Citation (applicant)

  • EP 20217335 A 20201228
  • BAILEY, M.J.POUTANEN, K, APPL. MICROBIOL. BIOTECHNOL., vol. 30, 1989, pages 5 - 10

Citation (search report)

  • [X] WO 2015018908 A1 20150212 - NOVOZYMES AS [DK]
  • [A] WO 2007095398 A2 20070823 - DIVERSA CORP [US], et al
  • [A] US 2004112555 A1 20040617 - TOLAN JEFFREY [CA], et al
  • [A] WO 02057541 A2 20020725 - IOGEN BIO PRODUCTS CORP [CA], et al
  • [A] WO 03062409 A2 20030731 - ROCHE VITAMINS AG [CH], et al
  • [A] WO 2021018751 A1 20210204 - NOVOZYMES AS [DK]
  • [A] WO 2016135173 A1 20160901 - CARBIOS [FR]
  • [I] KUMAR VISHAL ET AL: "Thermostable microbial xylanases for pulp and paper industries: trends, applications and further perspectives", WORLD JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY, SPRINGER NETHERLANDS, DORDRECHT, vol. 32, no. 2, 11 January 2016 (2016-01-11), pages 1 - 10, XP035935406, ISSN: 0959-3993, [retrieved on 20160111], DOI: 10.1007/S11274-015-2005-0
  • [A] "Sustainable Degradation of Lignocellulosic Biomass - Techniques, Applications and Commercialization", 15 May 2013, INTECH, ISBN: 978-9-53-511119-1, article F. L. ET AL: "A Review of Xylanase Production by the Fermentation of Xylan: Classification, Characterization and Applications", XP055185297, DOI: 10.5772/53544

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

Designated validation state (EPC)

KH MA MD TN

DOCDB simple family (publication)

EP 4230791 A1 20230823; WO 2023156215 A1 20230824

DOCDB simple family (application)

EP 22157484 A 20220218; EP 2023052623 W 20230203