24 May paraphrase
Recovery of Kerosene Using Liquid-Liquid Extraction
Experimental Description and Objective:
A company has a 10 L/min waste stream contains kerosene and 0.67 wt.% of acetic acid. A liquid-liquid Extraction (LLE) process is recommended to reduce the amount of acetic acid to less than 0.05 wt.% to sell kerosene. An LLE unit 1.6 m tall and 50 mm diameter column filled with 1.2 m packing of ½ inch glass Rasching rings which was provided to investigate the LLE capability and address any recommendation to improve the process towards the requirements. The objective is to design an LLE unit for the company waste stream conditions. To do so, a study of the equilibrium distribution curve and distribution coefficient using a bench-scale experiment in the rang 0.5 to 2 wt.% acetic acid required. Also, determining the overall mass transfer coefficient (KL) and mass transfer area (a) as a function of flowrate would be obtained to reach the experimental objective. Background: Liquid-liquid extraction (LLE) is a solution to separate liquids with low relative volatility which required a high cost distillation process. Also, LLE can separate thermally sensitive compounds since the process does not need change in temperature. To perform the process, the feed contains salute dissolved in medium contacts with solvent (immiscible in the medium) to absorb the salute and leave as extract stream. The other components in the feed leave as a raffinate stream. Therefore, three types of LLE concurrent, crosscurrent, and countercurrent are different based on the arrangement of their inlets and outlets.1 Since mass transfer has the major effect in this process equation (1) shows the relation of overall liquid capacity coefficient to the logarithmic-mean driving force.
𝐾”# = 𝐾” % & = ”
‘∙)
*+,-*+. *+ ∗ -*+ 01
(equ 1)
The overall mass transfer coefficient found to be 1.204×10-5(m/s).2
1 Raghav, T. (2018). liquid liquid extraction in a packed bed. [online] Academia.edu. Available at: http://www.academia.edu/8542465/liquid_liquid_extraction_in_a_packed_bed [Accessed 8 Feb. 2018]. 2 Reactive Extraction of Levulinic Acid from AqueousSolutions with Tri-n-octylamine (TOA) in 1-Octanol:Equilibria, Kinetics, and Model Development. (2010). Indian Institute of Chemical Technology.
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