EP 0909353 B1 20010509 - METHOD AND DEVICE FOR THE CONTINUOUS COOKING OF PULP
Title (en)
METHOD AND DEVICE FOR THE CONTINUOUS COOKING OF PULP
Title (de)
VERFAHREN UND VORRICHTUNG ZUR KONTINUIERLICHEN ZELLSTOFFKOCHUNG
Title (fr)
PROCEDE ET DISPOSITIF DE CUISSON CONTINUE DE PATE
Publication
Application
Priority
- SE 9800225 W 19980209
- SE 9700192 W 19970209
Abstract (en)
[origin: WO9835090A1] This invention relates to a new and improved way of continuously cooking fibre material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimise chemical consumption and heat-economy and at the same time achieve very good pulp properties. The fibre material is heated and impregnated by the aid of black liquor to a temperature less than 140 DEG C and passed in con-current in an impregnation zone (A). The heated and impregnated fibre material is transferred to a con-current cooking zone (B) in the upper part of a digester (6). At least 60 % of the quantity of liquor (F) required for the cooking reaction is supplied in the up-stream end of the con-current cooking zone (B) in order to obtain a level of effective alkali exceeding 35 g/l. The cooking temperature in the con-current cooking zone (B) is lower than 160 DEG C. Spent liquor (E), with an amount of effective alkali of at least 13 g/l, is withdrawn from a strainer girdle (8). A substantial part of the spent liquor is supplied to the impregnation zone.
IPC 1-7
IPC 8 full level
D21C 3/02 (2006.01); D21C 3/22 (2006.01); D21C 3/24 (2006.01)
CPC (source: EP)
D21C 3/02 (2013.01); D21C 3/22 (2013.01); D21C 3/24 (2013.01)
Designated contracting state (EPC)
AT CH DE ES FI FR GB LI NL PT SE
DOCDB simple family (publication)
WO 9835090 A1 19980813; AT E201064 T1 20010515; AU 2183697 A 19980826; CA 2279283 A1 19980813; CA 2279283 C 20080826; DE 69800767 D1 20010613; DE 69800767 T2 20011129; EP 0909353 A1 19990421; EP 0909353 B1 20010509; ES 2159175 T3 20010916; ZA 98936 B 19980923
DOCDB simple family (application)
SE 9700192 W 19970209; AT 98903344 T 19980209; AU 2183697 A 19970209; CA 2279283 A 19980209; DE 69800767 T 19980209; EP 98903344 A 19980209; ES 98903344 T 19980209; ZA 98936 A 19980205