Stability of Sodium Sulfate Dicarbonate (∼2Na2CO3·Na2SO4) Crystals Obtained from Evaporation of Aqueous Solutions of Na2CO3 and Na2SO4

Stability of Sodium Sulfate Dicarbonate (∼2Na2CO3·Na2SO4) Crystals Obtained from Evaporation of Aqueous Solutions of Na2CO3 and Na2SO4

Crystallization of sodium sulfate dicarbonate (∼2Na2CO3·Na2SO4) is known to be a primary contributor to the fouling of heat-transfer equipment in spent-liquor concentrators used in the pulp and paper industry. Therefore, understanding the conditions leading to the formation and in-process stability...

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Veröffentlicht in:Industrial & engineering chemistry research 2006-10, Vol.45 (21), p.7144-7150
Hauptverfasser: Bayuadri, Cosmas, Verrill, Christopher L, Rousseau, Ronald W
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Chemical engineering
Exact sciences and technology
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container_title Industrial & engineering chemistry research
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creator Bayuadri, Cosmas
Verrill, Christopher L
Rousseau, Ronald W
description Crystallization of sodium sulfate dicarbonate (∼2Na2CO3·Na2SO4) is known to be a primary contributor to the fouling of heat-transfer equipment in spent-liquor concentrators used in the pulp and paper industry. Therefore, understanding the conditions leading to the formation and in-process stability of this double salt and the related burkeite salt is crucial to the elimination or reduction of industrial problems. In this work, double salts were generated in a batch crystallizer at close-to-industrial process conditions. X-ray diffraction, calorimetry, and microscopic observation were used to investigate the stability of the salts to in-process aging, isolation and storage, and exposure to high temperature. The results verify that sodium sulfate dicarbonate exists as a unique phase in this system and that it remains stable at process conditions.
doi_str_mv 10.1021/ie060540q
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title Stability of Sodium Sulfate Dicarbonate (∼2Na2CO3·Na2SO4) Crystals Obtained from Evaporation of Aqueous Solutions of Na2CO3 and Na2SO4
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