Abstract
In order to utilize the residual acetic acid formed by SCWO of vegetables, the optimum reaction condition and conversion efficiency of residual acetic acid to (CH3COO) 2Ca were investigated. (CH3COO)2 Ca can be used as a deicer better than the traditional ones such as NaCl and CaCl2 from the viewpoint of environmental protection as well as anti-corrosion.
Results showed that acetic acid of high concentration was obtained under the condition of insufficient oxygen supply. And acetic acid obtained under the condition of temperature of 400 °C, 90 s of reaction time and 50 % of H2O2 supply has not only the high concentration but also has the fairly high purity. By direct addition of CaCO3 or Ca(OH)2 into the solution after the reaction under this condition, residual acetic acid can be almost completely recovered as (CH3COO)2Ca. But crystallization of (CH3COO)2Ca does not occur when the concentration of residual intermediate products such as 2-propanone, 1-hydroxy is high.
The complete removal of residual organic materials in waste water by SCWO of garbage can be done by complete oxidation of garbage into acetic acid and its conversion into (CH3COO)2Ca.
