EP 0777780 B1 19981118 - SULPHITE DIGESTION PROCESS
Title (en)
SULPHITE DIGESTION PROCESS
Title (de)
SULFITAUFSCHLUSSVERFAHREN
Title (fr)
PROCEDE DE LESSIVAGE AU SULFITE
Publication
Application
Priority
- AT 9500170 W 19950825
- AT 165194 A 19940826
Abstract (en)
[origin: WO9606974A1] The present inventon relates to a sulphite fusion process for the production of celluloses using alkaline monosulphite solutions, organic solvents and quinone derivatives. The raw material to be fused is treated in a special impregnation step with either a solvent-free monosulphite solution or a solvent-water mixture.
IPC 1-7
IPC 8 full level
D21C 1/06 (2006.01); D21C 3/02 (2006.01); D21C 3/06 (2006.01); D21C 3/20 (2006.01); D21C 3/22 (2006.01)
CPC (source: EP)
D21C 1/06 (2013.01); D21C 3/022 (2013.01); D21C 3/20 (2013.01); D21C 3/222 (2013.01)
Citation (examination)
EP 0498330 A1 19920812 - ORGANOCELL GES FUER ZELLSTOFF [DE]
Designated contracting state (EPC)
AT DE ES PT SE
DOCDB simple family (publication)
WO 9606974 A1 19960307; AT 401068 B 19960625; AT A165194 A 19951015; AT E173517 T1 19981215; BR 9508634 A 19971230; CA 2198485 A1 19960307; CN 1160426 A 19970924; DE 59504281 D1 19981224; EP 0777780 A1 19970611; EP 0777780 B1 19981118; ES 2126305 T3 19990316; FI 970707 A0 19970219; FI 970707 A 19970219; ID 15812 A 19970814; RU 2124083 C1 19981227; ZA 956506 B 19960318
DOCDB simple family (application)
AT 9500170 W 19950825; AT 165194 A 19940826; AT 95928394 T 19950825; BR 9508634 A 19950825; CA 2198485 A 19950825; CN 95194771 A 19950825; DE 59504281 T 19950825; EP 95928394 A 19950825; ES 95928394 T 19950825; FI 970707 A 19970219; ID 951678 A 19950826; RU 97104473 A 19950825; ZA 956506 A 19950803