EP 0165945 A4 19860717 - METHOD OF IMPROVING THE PURITY OF ALKALI-METAL HYDROXIDES.
Title (en)
METHOD OF IMPROVING THE PURITY OF ALKALI-METAL HYDROXIDES.
Title (de)
VERFAHREN ZUR VERBESSERUNG DER REINHEIT VON ALKALIMETALLHYDROXYDEN.
Title (fr)
PROCEDE POUR AMELIORER LA PURETE D'HYDROXYDES DE METAL ALCALIN.
Publication
Application
Priority
AU PG300983 A 19831223
Abstract (en)
[origin: WO8502834A1] In a method for increasing the purity of alkali metal hydroxides, alkaline earth metal compounds are used to render contaminants insoluble, thereby lessening the entry of contaminants into a solution of alkali-metal hydroxide, or promoting removal of contaminants from a contaminated solution of alkali-metal hydroxide. The invention is particularly applicable to increasing the purity of alkali metal hydroxides regenerated from the spent liquor resulting from sulphur-free alkaline pulping of wood or of other natural material containing cellulose fibres.
IPC 1-7
IPC 8 full level
C01D 1/04 (2006.01); C01D 1/22 (2006.01); C01G 49/00 (2006.01); C01D 1/28 (2006.01); C01D 1/32 (2006.01); D21C 11/00 (2006.01); D21C 11/04 (2006.01); D21C 11/12 (2006.01)
CPC (source: EP)
C01D 1/32 (2013.01); D21C 11/0078 (2013.01); D21C 11/122 (2013.01)
Citation (search report)
- [X] DE 1076485 B 19600225 - INST ZELLSTOFF, et al
- [X] US 2628155 A 19530210 - EMANUEL GRUEN BENGT HERMAN
- [A] GB 381697 A 19321013 - ERIK LUDVIG RINMAN
- [T] TAPPI, vol. 68, no. 4, April 1985, pages 33,35, Easton, Penn., US; "The removal of aluminum from the recovery system of a closed kraft pulp mill"
- See also references of WO 8502834A1
Designated contracting state (EPC)
DE FR SE
DOCDB simple family (publication)
WO 8502834 A1 19850704; AU 3785285 A 19850712; BR 8407243 A 19851126; EP 0165945 A1 19860102; EP 0165945 A4 19860717; FI 853215 A0 19850821; FI 853215 L 19850821; IT 1177487 B 19870826; IT 8424161 A0 19841221; JP S61500783 A 19860424; ZA 849901 B 19850828
DOCDB simple family (application)
AU 8400270 W 19841224; AU 3785285 A 19841224; BR 8407243 A 19841224; EP 85900029 A 19841224; FI 853215 A 19850821; IT 2416184 A 19841221; JP 50026985 A 19841224; ZA 849901 A 19841219