EP 3571347 B1 20201028 - METHOD FOR BLEACHING PAPER PULP
Title (en)
METHOD FOR BLEACHING PAPER PULP
Title (de)
VERFAHREN ZUM BLEICHEN VON PAPIERZELLSTOFF
Title (fr)
PROCEDE DE BLANCHIMENT D'UNE PATE A PAPIER
Publication
Application
Priority
- FR 1750512 A 20170123
- FR 2018050120 W 20180118
Abstract (en)
[origin: WO2018134525A1] The present invention relates to a method for bleaching an unbleached or pre-bleached paper pulp comprising at least the following consecutive steps: a) preparing an unbleached or pre-bleached paper pulp having a pH of at least 8, b) bringing the paper pulp obtained at the end of step a) into contact with chlorine dioxide, c) when the pH of the paper pulp obtained from step b) is lower than 10, adding at least one Brønsted base to the paper pulp, d) adding hydrogen peroxide to the paper pulp obtained at the end of step c), e) maintaining the paper pulp obtained at the end of step d) in a first bleaching tower, f) optionally, adding sulphuric acid to the paper pulp obtained at the end of step e) and maintaining the obtained paper pulp in a second bleaching tower, the method dispensing with the need for a step of washing the paper pulp before the end of step e), and, if applicable, before the end of step f).
IPC 8 full level
CPC (source: EP KR RU US)
D21C 9/1005 (2013.01 - US); D21C 9/1042 (2013.01 - US); D21C 9/1057 (2013.01 - US); D21C 9/14 (2013.01 - EP KR RU US); D21C 9/163 (2013.01 - EP KR RU US)
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
DOCDB simple family (publication)
WO 2018134525 A1 20180726; AR 110905 A1 20190515; BR 112019014480 A2 20200211; BR 112019014480 B1 20230223; CA 3049171 A1 20180726; CL 2019001865 A1 20191122; CN 110177909 A 20190827; EP 3571347 A1 20191127; EP 3571347 B1 20201028; FR 3062138 A1 20180727; FR 3062138 B1 20190607; JP 2020514564 A 20200521; KR 102531578 B1 20230512; KR 20190104340 A 20190909; PT 3571347 T 20201211; RU 2019121768 A 20210111; RU 2019121768 A3 20210324; RU 2747664 C2 20210511; US 11384480 B2 20220712; US 2019345672 A1 20191114; UY 37578 A 20180831; ZA 201904595 B 20200226
DOCDB simple family (application)
FR 2018050120 W 20180118; AR P180100125 A 20180119; BR 112019014480 A 20180118; CA 3049171 A 20180118; CL 2019001865 A 20190704; CN 201880006735 A 20180118; EP 18703063 A 20180118; FR 1750512 A 20170123; JP 2019538189 A 20180118; KR 20197020426 A 20180118; PT 18703063 T 20180118; RU 2019121768 A 20180118; US 201816475887 A 20180118; UY 37578 A 20180122; ZA 201904595 A 20190712