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1. (WO2017091129) METHOD AND SYSTEM FOR OXYGEN DELIGNIFICATION OF CELLULOSE PULP
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2017/091129 International Application No.: PCT/SE2016/051128
Publication Date: 01.06.2017 International Filing Date: 16.11.2016
IPC:
D21C 9/147 (2006.01)
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9
After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
10
Bleaching
147
with oxygen or its allotropic modifications
Applicants:
VALMET AB [SE/SE]; . 851 94 Sundsvall, SE
Inventors:
DAHLLÖF, Håkan; SE
Agent:
SAITTON, Hanna; SE
Priority Data:
1551539-827.11.2015SE
Title (EN) METHOD AND SYSTEM FOR OXYGEN DELIGNIFICATION OF CELLULOSE PULP
(FR) PROCÉDÉ ET SYSTÈME DE DÉLIGNIFICATION À L'OXYGÈNE DE PÂTE CELLULOSIQUE
Abstract:
(EN) The invention relates to an improved oxygen delignification stage located between 2 wash positions (W1, W2) in a fiberline producing bleached qualities of cellulose pulp. The inventive method and system divide the oxygen stage into at least 2 phases, and after the first phase is the pulp suspension effectively depressurized and vented to atmosphere in order to vent away the bulk volume of inert gases formed during the first phase. The partial pressure of oxygen added to final phase may thus be increased and the amount of oxygen dissolved in the liquid phase is increased enabling better delignification of the cellulose pulp in the final phase.
(FR) L'invention concerne un étage de délignification à l'oxygène améliorée situé entre 2 positions de lavage (W1, W2) dans une ligne de fabrication de fibres produisant des qualités blanchies de pâte cellulosique. Le procédé et le système de l’invention divisent l’étage d’oxygène en au moins 2 phases et, après la première phase, la suspension de pâte est efficacement dépressurisée et aérée à l’atmosphère afin d’évacuer le volume majeur de gaz inertes formés pendant la première phase. La pression partielle d’oxygène ajouté à la phase finale peut ainsi être augmentée et la quantité d’oxygène dissous dans la phase liquide est augmentée, de manière à permettre une meilleure délignification de la pâte cellulosique dans la phase finale.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP3380667BR112018005525