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Kinetics of sodium bicarbonate decomposition
Author(s) -
Hu Wang,
Smith J. M.,
Doǧu Timur,
Doǧu Gülsen
Publication year - 1986
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690320909
Subject(s) - sodium bicarbonate , decomposition , thermal decomposition , chemistry , activation energy , volume (thermodynamics) , kinetics , bicarbonate , gravimetric analysis , sodium , thermodynamics , reaction rate constant , analytical chemistry (journal) , inorganic chemistry , chromatography , organic chemistry , physics , quantum mechanics
A thermal gravimetric method was used to measure rates of decomposition of NAHCO 3 particles. Such decomposition produces a highly porous Na 2 Co 3 that reacts with SO 2 rapidly and completely at moderate temperatures. Hence, NaHCO 3 decomposition provides a reactant with attractive features for SO 2 removal. The rapid rate of decomposition combined with the high heat effect prevented determining intrinsic rates by constant temperature runs when the temperature level was above 400 K. However, rising‐temperature runs, which allowed time for heat transfer to equilibrate temperatures of the thermocouple and particles, gave reliable results at high temperatures. The activation energy was 102 kJ/mol. Porosimeter data verified the large increase in pore volume (from 0.03 to 0.39 × 10 −3 m 3 /kg) on converting the NaHCO 3 particles to Na 2 CO 3 . First‐order kinetics were observed up to high conversions, after which the apparent order decreased. However, the sodium bicarbonate could be completely converted to Na 2 CO 3 .