EP 3443159 A1 20190220 - A CONTINUOUS PROCESS FOR PRODUCTION OF CELLULOSE PULP
Title (en)
A CONTINUOUS PROCESS FOR PRODUCTION OF CELLULOSE PULP
Title (de)
KONTINUIERLICHES VERFAHREN ZUR HERSTELLUNG VON ZELLSTOFF
Title (fr)
PROCESSUS CONTINU DESTINÉ À LA PRODUCTION DE PÂTE DE CELLULOSE
Publication
Application
Priority
HR 2016000014 W 20160415
Abstract (en)
[origin: WO2017178849A1] The present invention discloses the continuous process for production of cellulose pulp of very high whiteness from grass-like plant feedstock suitable for paper making. Process comprising the steps of: preparing the grass-like plant feedstock by comminuting; dedusting; continuous digestion with optimized concentrations of NaOH and NaCl; disperging; continuous bleaching with optimized concentrations of H2O2 and sodium silicate without the use of NaOH; optional disperging; dewatering to remove the black liquor; and washing, to yield final cellulose pulp of very high whiteness, >90%, suitable for manufacturing of paper or cellulose sheets. The process additionally includes integrated electrolytic removal of lignin and other by-products accompanied with regeneration of cooking chemicals solution, what enables completely closed process materials cycle. In one form of invention, heating of digesting and bleaching steps can be optionally performed by microwave (MW) heating. The preferred grass-like feedstock for the process is miscanthus (Miscanthus x giganteus, Andersson).
IPC 8 full level
D21C 3/02 (2006.01); D21C 9/10 (2006.01); D21C 9/16 (2006.01); D21C 11/00 (2006.01); D21H 11/12 (2006.01)
CPC (source: EP)
D21C 3/02 (2013.01); D21C 9/1063 (2013.01); D21C 9/163 (2013.01); D21C 11/0007 (2013.01); D21H 11/12 (2013.01)
Citation (search report)
See references of WO 2017178849A1
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
DOCDB simple family (publication)
WO 2017178849 A1 20171019; DK 3443159 T3 20200727; EP 3443159 A1 20190220; EP 3443159 B1 20200603; ES 2806475 T3 20210217; HR P20200981 T1 20201016; PL 3443159 T3 20200921; RS 60519 B1 20200831
DOCDB simple family (application)
HR 2016000014 W 20160415; DK 16722693 T 20160415; EP 16722693 A 20160415; ES 16722693 T 20160415; HR P20200981 T 20200622; PL 16722693 T 20160415; RS P20200820 A 20160415