| Summary: | ABSTRACT
The use of rice hull ash to produce sodium silicate will increase the value-added of ash. Kinetic data are necessary in order to design a rector for industrial scale. Therefore, in this study, the kinetics of sodium silicate formation from as rice hull ash and 15% sodium hidroxide solution was investigated.
Raw materials used were rice hull ash and sodium hidroxide solution. Both were reacted in a continuous reactor provided with slanted serrated buffles. Samples were taken after steady state condition had been attained, then filtered and analyzed gravimetrically for its silicate content. Variables studied were air flow rate and temperature.
The formation of sodium silicate from rice hull ash and sodium hidroxide solution is controlled by chemical reaction. The rate constant, kR a, can be expressed as follows
kR as = 26566729 e-5600/T, cm3/ (mgmol min).
For 60 minutes residence time of sodium hidroxide solution, air flow rate of 672 mL/min and temperature of the system of 60 °C, the maximum conversion of silica was 68.15%.
Key words : Ash of rice hull - kinetic - sodium silicate
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