pH Effects on Separation Using Supported Liquid Membrane with Strip Dispersion and Mathematical Modeling Analysis
Date Issued
2015
Date
2015
Author(s)
Chang, I-Wei
Abstract
The use of supported liquid membrane to separate metal ions has been widely reported for its efficiency and simple process. Mathematical models for this technique have been proposed to describe the transport behavior. In this work, a simplified model for the separation of Dy3+ and Nd3+ through supported liquid membrane with strip dispersion (SLMSD) is established and the situation of excess amount of metal ions is considered. Parameters were calculated based on single-ion experiment. For Dy3+, the equilibrium constant was found to be 35841.3, the hydraulic mass transfer coefficient 7.016×10-6m/s, and the mass transfer coefficient of the complex in the membrane phase 4.301×10-7m/s. For Nd3+, the values were 16.7, 9.665×10-6m/s, 3.430×10-7m/s respectively. The model showed good agreements in Dy3+/Nd3+ separation experiments in various pH value and extractant concentration. The simplicity of the model gives an advantage on scale-up process.
Subjects
supported liquid membrane
model
extraction
di-(2-ethylhexyl) phosphoric acid
Type
thesis
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