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The development of an empirical mass transfer relationship for the extraction of copper ions in a carrier facilitated tubular supported liquid membrane system
Author(s)
Makaka, Siphokazi
Date Issued
2011
Type
Thesis
Publisher
Cape Peninsula University of Technology
Abstract
Treatment of waste material from mining and mineral processing is gaining increasing
importance as a result of the increasing demand for high purity products and environmental
concerns. Supported liquid membranes (SLMs) have been proposed as a new technology
for the selective removal of metal ions from a solution. This technology can be described as
the simultaneous extraction and stripping operation, combined in a continuous single process
unit.
Theoretically, the rate of mass transfer through SLM systems could be controlled by three
resistances, namely:
· Resistance through the feed-side
· Resistance through the strip-side laminar layers; and
· Diffusion through the membrane.
It has been reported that transport resistance in the feed-side laminar layer is controlling.
(Srisurichan et al, 2005:186).
The objective of this research was to extract copper ions in a TSLM system, evaluate the
effect of the feed characteristics on the feed-side laminar layer and determine a relationship
between the applicable dimensionless numbers, i.e. Sherwood, Schmidt and Reynolds
numbers.
A Counter-current, double pipe Perspex bench-scale reactor, consisting of a single
hydrophobic PVDF tubular membrane mounted vertically within, was used for the test work.
The membrane was impregnated with LIX 984N-C and became the support for this organic
transport medium. Dilute Copper solution passed through the centre pipe and sulphuric acid,
as a strippant, passed through the shell side.
In this test work, Copper was successfully transported from the feed-side to the strip-side
and through repetitive results; a relationship between dimensionless numbers was achieved.
importance as a result of the increasing demand for high purity products and environmental
concerns. Supported liquid membranes (SLMs) have been proposed as a new technology
for the selective removal of metal ions from a solution. This technology can be described as
the simultaneous extraction and stripping operation, combined in a continuous single process
unit.
Theoretically, the rate of mass transfer through SLM systems could be controlled by three
resistances, namely:
· Resistance through the feed-side
· Resistance through the strip-side laminar layers; and
· Diffusion through the membrane.
It has been reported that transport resistance in the feed-side laminar layer is controlling.
(Srisurichan et al, 2005:186).
The objective of this research was to extract copper ions in a TSLM system, evaluate the
effect of the feed characteristics on the feed-side laminar layer and determine a relationship
between the applicable dimensionless numbers, i.e. Sherwood, Schmidt and Reynolds
numbers.
A Counter-current, double pipe Perspex bench-scale reactor, consisting of a single
hydrophobic PVDF tubular membrane mounted vertically within, was used for the test work.
The membrane was impregnated with LIX 984N-C and became the support for this organic
transport medium. Dilute Copper solution passed through the centre pipe and sulphuric acid,
as a strippant, passed through the shell side.
In this test work, Copper was successfully transported from the feed-side to the strip-side
and through repetitive results; a relationship between dimensionless numbers was achieved.
Additional information
Thesis submitted in fulfilment of the requirements for the degree
Master of Technology: Chemical Engineering
in the Faculty of Engineering
at the Cape Peninsula University of Technology
2011
Master of Technology: Chemical Engineering
in the Faculty of Engineering
at the Cape Peninsula University of Technology
2011
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