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1. (WO2019009792) METHOD FOR OPERATING A CONTINUOUS VERTICAL REACTOR COMPRISING A PREHYDROLYSIS ZONE AND THE REACTOR DESIGN AS SUCH
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Pub. No.: WO/2019/009792 International Application No.: PCT/SE2018/050715
Publication Date: 10.01.2019 International Filing Date: 02.07.2018
IPC:
D21C 1/04 (2006.01) ,D21C 1/02 (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
1
Pretreatment of the finely-divided materials before digesting
04
with acid reacting compounds
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
1
Pretreatment of the finely-divided materials before digesting
02
with water or steam
Applicants:
VALMET AB [SE/SE]; . 851 94 Sundsvall, SE
Inventors:
SJÖBLOM, Krister; SE
Agent:
JOHANSSON, Roger; SE
Priority Data:
1750871-404.07.2017SE
Title (EN) METHOD FOR OPERATING A CONTINUOUS VERTICAL REACTOR COMPRISING A PREHYDROLYSIS ZONE AND THE REACTOR DESIGN AS SUCH
(FR) PROCÉDÉ DE FONCTIONNEMENT D'UN RÉACTEUR VERTICAL CONTINU COMPRENANT UNE ZONE DE PRÉ-HYDROLYSE ET LA CONCEPTION DU RÉACTEUR EN TANT QUE TELLE
Abstract:
(EN) The invention relates to a method for inhibiting build-up of deposits of sticky reaction products on the interior reactor surfaces in an acidic prehydrolysis zone of continuous vertical reactor vessels or digesters and a reactor design that enables implementation of the inventive method. According to the inventive method and reactor,a layer (Lay) of alkaline liquid is established on the inner wall of the reactor in the prehydrolysiszone, which alkaline layer prevents sticky deposits from forming and adhering to the inner wall of the vertical reactor.
(FR) L'invention concerne un procédé d'inhibition de l'accumulation de dépôts de produits de réaction collants sur les surfaces internes du réacteur dans une zone de pré-hydrolyse acide de cuves ou digesteurs verticaux continus et une conception de réacteur qui permet la mise en œuvre du procédé selon l'invention. Selon le procédé et le réacteur de l'invention, une couche (Lay) de liquide alcalin est établie sur la paroi interne du réacteur dans la zone de pré-hydrolyse, laquelle couche alcaline empêche la formation et l'adhérence de dépôts collants sur la paroi interne du réacteur vertical.
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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, JO, JP, KE, KG, KH, 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 Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (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)