EP 0502052 B1 19941005 - A PROCESS FOR THE PREPARATION OF COOKING LIQUORS HAVING HIGH SULPHIDITY FOR SULPHATE PULP COOKING.
Title (en)
A PROCESS FOR THE PREPARATION OF COOKING LIQUORS HAVING HIGH SULPHIDITY FOR SULPHATE PULP COOKING.
Title (de)
VERFAHREN ZUR HERSTELLUNG VON AUFSCHLUSSLÖSUNGEN MIT HOHER SULFIDITÄT FÜR DAS KOCHEN VON SULFATPULPE.
Title (fr)
PROCEDE DE PREPARATION DE LIQUEURS DE CUISSON DE SULFIDITE ELEVEE POUR LA CUISSON DE PATE A PAPIER AU SULFATE.
Publication
Application
Priority
- SE 8903953 A 19891123
- SE 9000751 W 19901121
Abstract (en)
[origin: WO9108337A1] The invention relates to a process for preparation, under reducing conditions, of cooking liquors having high sulphidity for sulphate pulp cooking, wherein the black liquor obtained in the cooking process is fed, after evaporation, completely or partly to a reactor operating at increased temperature which is obtained by energy supply from an external heat source and/or release of energy from the black liquor, a melt essentially consisting of sodium sulphide being formed and withdrawn to be further processed to cooking liquor. The process of the invention is characterized in that in addition there are fed to the reactor the whole or part of sulphur-containing and/or sulphur- and sodium-containing materials present in the pulp mill, including sulphur-containing and/or sodium- and sulphur-containing make-up chemicals used for the total chemicals balance of the pulp mill, in such a way that the mole ratio of sodium to sulphur in the total mixture fed to the reactor is within the range of 1.5 to 4. According to a preferred embodiment of the invention there is used an aqueous solution of the sodium sulphide melt obtained in so-called modified sulphate cooking.
IPC 1-7
IPC 8 full level
D21C 3/02 (2006.01); D21C 11/04 (2006.01); D21C 11/12 (2006.01); D21H 17/00 (2006.01)
CPC (source: EP)
D21C 11/04 (2013.01); D21H 17/00 (2013.01)
Designated contracting state (EPC)
AT DE ES FR SE
DOCDB simple family (publication)
WO 9108337 A1 19910613; AR 243947 A1 19930930; AT E112595 T1 19941015; AU 662882 B2 19950921; AU 6883691 A 19910626; BR 9007837 A 19920825; CA 2069107 A1 19910524; CA 2069107 C 20020409; CN 1030003 C 19951011; CN 1051953 A 19910605; DE 69013159 D1 19941110; DE 69013159 T2 19950309; EP 0502052 A1 19920909; EP 0502052 B1 19941005; ES 2062569 T3 19941216; FI 103902 B1 19991015; FI 103902 B 19991015; FI 922288 A0 19920520; FI 922288 A 19920520; JP 2815701 B2 19981027; JP H05502274 A 19930422; MX 173408 B 19940301; MY 104532 A 19940430; NO 176109 B 19941024; NO 176109 C 19950201; NO 921962 D0 19920519; NO 921962 L 19920520; RU 2067637 C1 19961010; SE 465039 B 19910715; SE 8903953 D0 19891123; SE 8903953 L 19910524; ZA 909337 B 19910925
DOCDB simple family (application)
SE 9000751 W 19901121; AR 31843590 A 19901121; AT 90917424 T 19901121; AU 6883691 A 19901121; BR 9007837 A 19901121; CA 2069107 A 19901121; CN 90109309 A 19901121; DE 69013159 T 19901121; EP 90917424 A 19901121; ES 90917424 T 19901121; FI 922288 A 19920520; JP 50032190 A 19901121; MX 2339590 A 19901121; MY PI19902045 A 19901121; NO 921962 A 19920519; SE 8903953 A 19891123; SU 5052326 A 19901121; ZA 909337 A 19901121