Title of article :
Solubility of Na2SO4, Na2CO3 and their mixture in supercritical water
Author/Authors :
Khan، نويسنده , , M.S and Rogak، نويسنده , , S.N، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Pages :
15
From page :
359
To page :
373
Abstract :
The solubility of many salts in water decreases dramatically with temperature in the vicinity of the critical point of pure water. Examples of these salts are sulfates of sodium, potassium, lithium and sodium carbonate. These salts are usually produced during supercritical water oxidation (SCWO) and contribute to fouling. The solubility of Na2CO3 and Na2SO4 has been determined in pure form and in the presence of each other, for the temperature range relevant to SCWO. The experimental procedure was to pass the salt solution through a tube at constant temperature. After a brief initiation period during which no salt sticks to the tube, the salt above the solubility limit deposited on the tube surface. The solution leaving the section was thus at the solubility limit. A rapid decrease in the salt solubility was observed just above the pseudo-critical temperature. For supercritical conditions, the solubility of each salt in the form of a mixture was quite close to the solubility of pure salt. At the highest fluid density considered (∼480 kg/m3) the presence of Na2CO3 reduces the solubility of Na2SO4, as might be expected from the “common-ion effect”.
Keywords :
solubility , supercritical water , Sodium sulfate , sodium carbonate
Journal title :
Journal of Supercritical Fluids
Serial Year :
2004
Journal title :
Journal of Supercritical Fluids
Record number :
1419111
Link To Document :
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