Abstract
This use of biomass-based adsorbent has been explored for the column study of the adsorptive dehydration of water in ethanol-water mixtures. The column study was carried out using enzyme modified corn starch and the breakthrough curve parameters were used to design the packed bed column. The effect of flow rate on the breakthrough curves revealed that adsorption efficiency decreased with increased inflow rate. The empty bed contact time (τ) of the pilot plant packed column was 35.35 min while the breakthrough time is 40.78 min. 66.7% was the fraction of capacity left unused for the pilot plant from the design.
Highlights
Fixed column adsorption study can be operated in series or in parallel
The scale-up procedure approach for the packed column design is as follows: 1) Use a pilot test column filled with the carbon to be used in full scale application
This can be explained from the mass transfer vicinity, the rate of mass transfer gets increased at higher flow rate leading to faster saturation
Summary
Fixed column adsorption study can be operated in series or in parallel. There are two types of influent modes for fixed bed columns, down flow and up flow. As the equilibrium zone approaches the bottom of the column bed, the concentration of adsorbate in the effluent increases, and equals the influent adsorbate concentration. Packed column can be designed using two approaches, scale-up procedure and kinetic approach. In both approaches a breakthrough curve from the test column, either laboratory or pilot scale is required, and the column should be as large as possible to minimize side-wall effects. The scale-up procedure approach for the packed column design is as follows: 1) Use a pilot test column filled with the carbon (adsorbent) to be used in full scale application. The kinetic approach This method utilizes the following kinetic equation: C≅
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