EP 0287960 A3 19910417 - A PROCESS FOR THE PRODUCTION OF A HEMICELLULOSE HYDROLYSATE AND SPECIAL PULP
Title (en)
A PROCESS FOR THE PRODUCTION OF A HEMICELLULOSE HYDROLYSATE AND SPECIAL PULP
Publication
Application
Priority
FI 871730 A 19870421
Abstract (en)
[origin: EP0287960A2] The invention relates to a process for the production of a hemicellulose hydrolysate and special pulp through two steps, the first step comprising the prehydrolysis of the material and the second step the dissolving of the lignin contained in the prehydrolyzed material. According to the process the lignin dissolving is carried out by means of a neutral sulphite cooking with anthraquinone or a derivative thereof as a catalyst, the pH of the cooking liquor being initially at least 10.
IPC 1-7
IPC 8 full level
D21C 3/02 (2006.01); C13K 1/02 (2006.01); D21C 1/04 (2006.01); D21C 3/22 (2006.01)
CPC (source: EP)
C13K 1/02 (2013.01); D21C 3/222 (2013.01)
Citation (search report)
- [Y] DE 2628971 A1 19780105 - WALDHOF ASCHAFFENBURG PAPIER
- [Y] CA 1216105 A 19870106 - CANADIAN IND
- [A] US 3532597 A 19701006 - LJUNGQVIST KARL JOHAN
- [A] ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY. vol. 58, no. 7, January 1988, APPLETON US page 943 Abou-State, M.A.: "Highly reactive viscose pulp from wheat straw by alkaline sulfide-sulfite-anthraquinone pulping."
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0287960 A2 19881026; EP 0287960 A3 19910417; EP 0287960 B1 19940921; AT E111986 T1 19941015; BR 8801894 A 19881122; CA 1295095 C 19920204; DE 3851565 D1 19941027; DE 3851565 T2 19950126; ES 2062995 T3 19950101; FI 79564 B 19890929; FI 79564 C 19900110; FI 871730 A0 19870421; FI 871730 A 19881022; RU 1799408 C 19930228
DOCDB simple family (application)
EP 88106006 A 19880415; AT 88106006 T 19880415; BR 8801894 A 19880421; CA 564311 A 19880415; DE 3851565 T 19880415; ES 88106006 T 19880511; FI 871730 A 19870421; SU 4355611 A 19880420