Warianty tytułu
The technique for sodium carbonate autocaustization with sodium metaborate
Języki publikacji
Abstrakty
Przedstawiono proces autokaustyzacji boranowej zachodzący w palenisku kotła sodowego i rozpuszczalniku stopu w obecności metaboranu sodowego. Omówiono mechanizm i reakcje chemiczne, których przebieg jest zależny od warunków, głównie temperatury, a także stosunku molowego Na/B w ługu czarnym. Stwierdzono, że częściowa autokaustyzacja boranowa jest obecnie technicznie możliwa i ekonomicznie korzystna, w szczególności w celulozowniach siarczanowych, w których "wąskim gardłem" jest oddział kaustyzacji i wypalania wapna. Świadczą o tym zakończone powodzeniem próby wdrożenia tej technologii w skali przemysłowej. Już kilka celulozowni na świecie stosuje technologię częściowej autokaustyzacji, co pozwoliło im na zwiększenie produkcji ługu białego bez poniesienia nakładów inwestycyjnych na wzrost wydajności tradycyjnych układów kaustyzacji i wypalania wapna. Dodatkową korzyścią jest zmniejszenie emisji zanieczyszczeń do środowiska oraz zmniejszenie zużycia energii/paliwa do pieca wapiennego. Autokaustyzacja boranowa może zastąpić lub wesprzeć istotną część tradycyjnego procesu regeneracji chemikaliów warzelnych w metodzie siarczanowej. Wdrożenie pełnej autokaustyzacji byłoby dużym przełomem w technologii produkcji mas celulozowych siarczanowych, a właściwie należałoby mówić o nowej technologii siarczanowo-boranowej.
The article presents borate autocaustization in a recovery boiler furnace and dissolving tank with sodium metaborate. It discusses mechanism and chemical reactions, which course depends on some conditions, mainly temperature and molar ratio Na/B in black liquor. It was found that at present partial borate autocaustization is technically possible and cost effective, in particular in sulphate pulp mills where the caustization and lime kiln department is a main source of bottlenecks. This conclusion has been proved by successfully finished trials of implementing this technique in the industrial scale. Several pulp mills in the world already use the technique of partial autocaustization, which helps to increase production of white liquor without bearing costs for the capacity growth of the conventional caustization and lime kiln department. Additional benefit is connected with lower emissions to the environment and reduced consumption of energy or fuel by a lime-kiln. Borate autocaustization can replace or support a crucial part of conventional recovery of cooking chemicals in the sulphate method. Implementation of full autocaustization would be a turning point in the production of kraft pulp, actually a beginning of a new kraftborate technology.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
263-268
Opis fizyczny
Bibliogr. 39 poz.
Twórcy
autor
autor
- Instytut Biopolimerów i Włókien Chemicznych, ul. M. Skłodowskiej-Curie 19/27, 90-570 Łódź
Bibliografia
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- 6. Janson J.: "Use of unconventional alkali in cooking and bleaching. (5). Autocausticizing reactions", Paperi Puu 61, 1, 20-24, 27-30 (1979).
- 7. Janson J.: "Use of unconventional alkali in cooking and bleaching. (6). Autocausticizing of sulfur-containing model mixtures and spent liquors", Paperi Puu 61, 2, 98-103 (1979).
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Typ dokumentu
Bibliografia
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bwmeta1.element.baztech-article-LOD9-0032-0015