EP 1456135 A2 20040915 - PROCESS FOR RECOVERING AND RECYCLING COMPOUNDS CONTAINED IN EFFLUENTS OF THE DELIGNIFICATION AND BLEACHING IN PULP MILLS
Title (en)
PROCESS FOR RECOVERING AND RECYCLING COMPOUNDS CONTAINED IN EFFLUENTS OF THE DELIGNIFICATION AND BLEACHING IN PULP MILLS
Title (de)
VERFAHREN ZUR WIEDERGEWINNUNG UND -VERWENDUNG VON ABFALLSTOFFEN AUS DER DELIGNIFIZIERUNG UND BLEICHE IN ZELLSTOFFFABRIKEN
Title (fr)
PROCEDE DE RECUPERATION ET DE RECYCLAGE DE COMPOSES CONTENUS DANS DES EFFLUENTS PROVENANT DE PROCEDES DE DELIGNIFICATION ET DE BLANCHIMENT DANS DES USINES DE PATE A PAPIER
Publication
Application
Priority
- IT 0200652 W 20021011
- IT MI20012119 A 20011012
Abstract (en)
[origin: WO03031348A2] The process consists in : a) causing the black liquor resulting form a delignification process to undergo one or more anaerobic treatments in order to produce biogas form the organic substance to be used as an energy source and to convert, by such methanation, the sodium salts of the organic acids into Na2CO3, b) evaporating the liquor resulting from the anaerobic treatment in order to recover water condensate and concentrate the liquor, c) causing the concentrated black liquor to undergo an oxidation treatment in order to destroy the organic compounds with CO2 production and recover chemicals, heat and water, d) recovering the alkaline sodium salts by means of different solubility, e) causing the separated alkalis to undergo a decarbonation in order to transform them in carbonates ; and f) recausticing part of carbonates in sodium hydroxide, a reactant contained in the liquor of the delignification.
IPC 1-7
IPC 8 full level
C02F 1/02 (2006.01); C02F 1/04 (2006.01); C02F 1/60 (2006.01); C02F 1/74 (2006.01); C02F 3/28 (2006.01); C02F 9/00 (2006.01); C02F 9/14 (2006.01); D21C 11/00 (2006.01); D21C 11/14 (2006.01); C02F 1/72 (2006.01)
CPC (source: EP)
C02F 1/048 (2013.01); C02F 9/00 (2013.01); C12M 21/04 (2013.01); C12M 43/08 (2013.01); C12M 47/10 (2013.01); D21C 11/00 (2013.01); D21C 11/14 (2013.01); C02F 1/025 (2013.01); C02F 1/72 (2013.01); C02F 3/286 (2013.01); C02F 2103/28 (2013.01); Y02E 50/30 (2013.01); Y02P 20/59 (2015.11); Y02P 70/10 (2015.11)
Citation (search report)
See references of WO 03031348A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
DOCDB simple family (publication)
WO 03031348 A2 20030417; WO 03031348 A3 20031002; EA 200400532 A1 20050630; EP 1456135 A2 20040915; IT MI20012119 A1 20030412; JP 2005504899 A 20050217
DOCDB simple family (application)
IT 0200652 W 20021011; EA 200400532 A 20021011; EP 02785913 A 20021011; IT MI20012119 A 20011012; JP 2003534338 A 20021011