| Summary: | ABSTRACT
One of the efforts to refine crude palm oil is decolourization using activated carbon as an adsorbent in a fixed bed column. This research is
conducted to obtain a correlation between Sherwood and Reynolds
number that can be applied in designing such a column for commercial
purpose, included to be operated in both isothermal and non isothermal.
The adsorption was carried out continuously in an isothermal fixed bed column to generate a correlation between the Sherwood number and the Reynolds number and then the correlation was applied in mathematical modeling of non-isothermal process. In the isothermal session, the fixed bed column, which was submerged in a temperature-controlled waterbath, was filled up with crude palm oil and let proceed to equilibrium condition for about one hour. The temperature was maintained at feed temperature. Afterwards, the crude palm oil was flown into the column at certain flow rate and temperature. Samples were withdrawn from the end of the column at certain time interval and their absorbances were determined using visible spectrophotometer. In non-isothermal session, the column was isolated and filled up with crude palm oil and let proceed to equilibrium condition at ambient temperature. Crude palm oiI was then flown into the column at certain flow rate and temperature. In both isothermal and non-isothermal session, each run was conducted for 70 minutes.
The correlation among variables, which are grouped as Sherwood number and Reynolds number, is found as the following:
Sh = 2686.8 . Re�3983
with the average error of 5.46 % from the runs with temperature ranged from 30
°C up to 80 °C and Reynolds number ranged 0.016971 up to 1.102511.
Keywords: adsorption, fixed bed, isothermal, non- isothermal
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