EP 0483163 B1 19950510 - ENVIRONMENTALLY IMPROVED PROCESS FOR BLEACHING LIGNOCELLULOSIC MATERIALS.
Title (en)
ENVIRONMENTALLY IMPROVED PROCESS FOR BLEACHING LIGNOCELLULOSIC MATERIALS.
Title (de)
UMWELTFREUNDLICHERES VERFAHREN ZUM BLEICHEN VON LIGNOCELLULOSISCHEN MATERIALIEN.
Title (fr)
PROCEDE MOINS POLLUANT DE BLANCHIMENT DE MATIERES LIGNOCELLULOSIQUES.
Publication
Application
Priority
US 9002823 W 19900517
Abstract (en)
[origin: SE9200107L] (i) Wood chips are chemically digested to provide lignocellulosic pulp followed by e.g. washing and screening (ii) pulp is then O2 delignified and (iii) comminuted and O3 treated for further delignification and bleaching. Pulp prod. obtd. in (iii) can be further brightened by addn. of CO2 or a peroxide. Typically at end of step (ii) pulps have a K number of 10 or less and viscosity above 13cps.. Corresp. values at completion of (iii) are 5 or less and above 10cps.. Digestion in (i) is e.g. by Kraft pulping. Pulp pH in (iii) is pref. 1-4 and temp. is ambient.
IPC 1-7
IPC 8 full level
D21C 3/26 (2006.01); D21C 9/00 (2006.01); D21C 9/10 (2006.01); D21C 9/14 (2006.01); D21C 9/147 (2006.01); D21C 9/153 (2006.01); D21C 9/16 (2006.01)
IPC 8 main group level
D21C (2006.01)
CPC (source: EP KR SE)
D21C 9/1057 (2013.01 - EP); D21C 9/147 (2013.01 - EP KR); D21C 9/153 (2013.01 - EP SE)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB IT LI LU NL SE
DOCDB simple family (publication)
WO 9118145 A1 19911128; AT E122421 T1 19950515; AU 5676890 A 19911210; AU 638017 B2 19930617; BR 9007533 A 19920428; CA 2063591 A1 19911118; CA 2063591 C 19980203; CN 1043798 C 19990623; CN 1069304 A 19930224; DE 69019350 D1 19950614; DE 69019350 T2 19960215; EP 0483163 A1 19920506; EP 0483163 A4 19920805; EP 0483163 B1 19950510; ES 2073027 T3 19950801; JP 2825346 B2 19981118; JP H05500243 A 19930121; KR 920703922 A 19921218; NO 300929 B1 19970818; NO 920217 D0 19920116; NO 920217 L 19920305; PT 98487 A 19930129; PT 98487 B 19980630; RU 2102547 C1 19980120; SE 9200107 D0 19920115; SE 9200107 L 19920313; ZA 915969 B 19920429
DOCDB simple family (application)
US 9002823 W 19900517; AT 90908787 T 19900517; AU 5676890 A 19900517; BR 9007533 A 19900517; CA 2063591 A 19900517; CN 91108650 A 19910807; DE 69019350 T 19900517; EP 90908787 A 19900517; ES 90908787 T 19900517; JP 50826990 A 19900517; KR 920700104 A 19920117; NO 920217 A 19920116; PT 9848791 A 19910729; SE 9200107 A 19920115; SU 5011189 A 19900517; ZA 915969 A 19910730