D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 11/04 (2006.01) C01B 17/04 (2006.01) C01B 17/16 (2006.01) C01D 1/22 (2006.01) C01D 7/00 (2006.01) C01D 7/10 (2006.01) D21C 11/00 (2006.01) D21C 11/06 (2006.01)
Patent
CA 2116017
Sodium hydroxide is formed from sodium sulphate by a three step operation comprising converting the sodium sulphate to sodium sulphide, converting the sodium sulphide to sodium bicarbonate, and converting the sodium bicarbonate to sodium hydroxide. The operations preferably are effected in conjunction with a bleached kraft pulp mill operation, so as to utilize by-product sodium sulphate from chlorine dioxide generation to produce useful sodium hydroxide as sulphur without co-producing chlorine.
On produit de la soude caustique à partir de sulfate neutre de sodium selon un procédé en trois étapes qui consiste à convertir le sulfate de sodium en sulfure de sodium (26), à convertir le sulfure de sodium en bicarbonate de sodium (36), et à convertir ce dernier en soude caustique (58). Ces opérations sont de préférence effectuées conjointement avec la fabrication de pâte kraft blanchie afin d'utiliser le sous-produit composé de sulfate de sodium obtenu de la production de dioxyde de chlore pour produire de la soude caustique utile sous forme de soufre sans produire simultanément du chlore.
Smith James W.
Tran Hoc Nghia
Sim & Mcburney
Thor Technology Corporation
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