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Environmental Engineering Research 1998;3(2): 61-66.
Hydrothermal Decomposition of Formic Acid in Sub- and Supercritical Water
Kuan Soo Shin1, Hye Yun Cho1, Young Woo Nam2, and Dong Soo Lee3
1Department of Chemistry, Soong Sil University
2Department of Chemical Engineering, Soong Sil University
3Graduate School of Environmental Studies, Seoul National University
Corresponding Author: Kuan Soo Shin ,
Received: April 19, 1997;  Accepted: May 19, 1998.
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ABSTRACT
The decomposition kinetics of formic acid in sub-and supercritical water were experimentally measured using the plug flow tubular reactor in the temperature range from 340 to 420'C and the pressure range from 272 to 374 atm. The initial formic acid concentration was varied from 0.87 to 3.26 mol/L and the oxygen in water was deliberately excluded. It was found that the decomposition of formic acid proceeded via channel (1) HCOOH → CO + H2O and channel (2) HCOOH → CO2+H2. The Arrhenius expression for total decomposition rate constant was obtained as k = 2.7x1014exp(-47 kcal mol-1RT)s-1. The ratio of the rate constants for channel (2) over channel (1) determined from the amounts of CO2 and CO products was about 4.7. The water density did not have an effect on the decomposition rate in the density range from 0.2 to 0.5 g/mL.
Keywords: Supercritical Water Oxidation | Formic Acid | Decomposition | Kinetics | Rate Constant
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