EP 0273759 B1 19910904 - PROCEDURE FOR RECIRCULATING PHENOL IN A LIGNOCELLULOSIC MATERIALS DIGESTION PROCESS
Title (en)
PROCEDURE FOR RECIRCULATING PHENOL IN A LIGNOCELLULOSIC MATERIALS DIGESTION PROCESS
Publication
Application
Priority
FI 865360 A 19861231
Abstract (en)
[origin: EP0273759A2] A process for recirculating phenol in a lignocellulosic materials digestion process in which lignocellulosic material is digested with phenol-containing solutions in order to dissolve lignin, characterised in that phenol recirculation is carried out as a cyclic process in which the phenol-containing solution is first used in the washing of the cellulosic material from the phenol digeston, thereafter in the lignocellulosic material digestion step, and finally in a lignocellulosic material impregnation step preceding the phenol digestion process.
IPC 1-7
IPC 8 full level
D21C 3/20 (2006.01); D21C 1/04 (2006.01); D21C 3/04 (2006.01); D21C 9/02 (2006.01); D21C 11/00 (2006.01)
CPC (source: EP)
D21C 9/02 (2013.01)
Designated contracting state (EPC)
AT DE FR IT SE
DOCDB simple family (publication)
EP 0273759 A2 19880706; EP 0273759 A3 19890816; EP 0273759 B1 19910904; AT E66974 T1 19910915; BR 8707183 A 19880809; CA 1281714 C 19910319; DE 3772741 D1 19911010; FI 77062 B 19880930; FI 77062 C 19890110; FI 865360 A0 19861231; FI 865360 A 19880701; JP S63175188 A 19880719; NO 163747 B 19900402; NO 163747 C 19900711; NO 875428 D0 19871223; NO 875428 L 19880701; ZA 879483 B 19880514
DOCDB simple family (application)
EP 87311493 A 19871229; AT 87311493 T 19871229; BR 8707183 A 19871230; CA 555716 A 19871231; DE 3772741 T 19871229; FI 865360 A 19861231; JP 33680287 A 19871229; NO 875428 A 19871223; ZA 879483 A 19871217