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Doctoral Degrees (Process Engineering)
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Browsing Doctoral Degrees (Process Engineering) by Title

Browsing Doctoral Degrees (Process Engineering) by Title

Now showing items 3-22 of 46

The bio-disposal of lignocellulose substances with activated sludge

Qi, Bing Cui (Stellenbosch : Stellenbosch University, 2001-03)

ENGLISH ABSTRACT: Lignocellulose is the principal form of biomass in the biosphere and therefore the predominant renewable source in the environment. However, owing to the chemical and structural complexity of lignocellulose ...
CFD analysis of solid-liquid-gas interactions in flotation vessels

Karimi, Mohsen (Stellenbosch : Stellenbosch University, 2014-04)

ENGLISH ABSTRACT: A Computational Fluid Dynamics (CFD) model was developed for the prediction of flotation rate constants in a stirred flotation tank and validated against experimental data. The model incorporated local, ...
Characterisation and dynamic modelling of the behaviour of platinum group metals in high pressure sulphuric acid/oxygen leaching systems

Dorfling, Christie (2012-12)

ENGLISH ABSTRACT: Sulphuric acid/oxygen pressure leaching is typically employed on Base Metal Refineries (BMRs) to selectively dissolve base metals from platinum group metal (PGM) bearing nickelcopper matte. Optimal ...
Characterization and optimization of an extractor-type catalytic membrane reactor for meta-xylene isomerization over Pt-HZSM-5 catalyst

Daramola, Michael Olawale (Stellenbosch : University of Stellenbosch, 2010-12)

ENGLISH ABSTRACT: Future chemical production is faced with a challenge of limited material and energy resources. However, process intensification might play a significant role to alleviating this problem. Vision of process ...
Computerized design of solvents for extractive processes

Van Dyk, Braam (Stellenbosch : Stellenbosch University, 2001-12)

ENGLISH ABSTRACT: Separation processes are an integral part of chemical engineering. The purity of a chemical product is among the principal factors influencing its value. Therefore, any method that can increase the ...
Contributions to an improved understanding of the flotation process

O'Connor, Cyril Thomas (Stellenbosch : University of Stellenbosch, 2005-12)

This dissertation covers research carried out over the past 25 years in the area of flotation. Flotation is one of the most widely used processes in the beneficiation of minerals. The process is characterized by a number ...
Development of a bioprocess for the production of an aquaculture biological agent

Lalloo, Rajesh (Stellenbosch : University of Stellenbosch, 2010-12)

ENGLISH ABSTRACT: Biological agents offer several opportunities to address the many challenges faced in intensive reticulated aquaculture. We therefore isolated and selected Bacillus spp. as potential biological agents, ...
Development of crosslinkable, thermoplastic polyurethanes for cardiovascular prostheses

Theron, Jacobus Petrus (Stellenbosch : University of Stellenbosch, 2006-12)

Existing thermoplastic polyurethanes (TPUs), used in the manufacturing of cardiovascular devices, still have unproven long-term biostability and may be prone to excessive plastic deformation when subjected to cyclic ...
Development of enzyme technology for modification of functional properties of xylan biopolymers

Chimphango, Annie Fabian Abel (Stellenbosch : University of Stellenbosch, 2010-12)

ENGLISH ABSTRACT: There is growing interest to utilise xylan as speciality biopolymers in similar ways as high molecular weight polysaccharides such as starch and cellulose. The need to utilise xylan as alternative to ...
The economic feasibility of commercial biodiesel production in South Africa including analyses of important production and related parameters

Swart, Wessel Johannes (Stellenbosch : Stellenbosch University, 2012-03)

ENGLISH ABSTRACT: In the developed and developing world, the use of lipids for the production of alkyl esters, also known as biodiesel, showed phenomenal growth during the ten year period up to the end of 2007. The main ...
Evaluation and improvement of dehydrogenation conversion and isomerization selectivity in an extractor Catalytic Membrane Reactor

Van Dyk, Lizelle Doreen (Stellenbosch : University of Stellenbosch, 2005-03)

Recent advances in inorganic material preparation for membrane fabrication have extended the use of membranes to high temperature and chemically harsh environments. This has allowed inorganic membranes to be integrated ...
Evaluation and improvement of the sPC-SAFT equation of state for complex mixtures.

De Villiers, Adriaan Jacobus (Stellenbosch : Stellenbosch University, 2011-12)

ENGLISH ABSTRACT: Efficient process design commonly relies on equation-of-state (EOS) models to provide reliable estimates of thermodynamic properties. The accuracy of EOS models, in turn, depends on the extent to which ...
Extraction and recovery of precursor chemicals from sugarcane bagasse, bamboo and triticale bran using conventional, advanced and fractionation pretreatment technologies

Diedericks, Danie (Stellenbosch : Stellenbosch University, 2013-03)

ENGLISH ABSTRACT: Conventional, advanced and fractionation pretreatment technologies were employed to recover and/or enhance the efficacy of the main constituents present in lignocellulosic biomass. Bamboo and triticale ...
A fundamental evaluation of the atmospheric pre-leaching section of the nickel-copper matte treatment process

Lamya, Rodrick Mulenga (Stellenbosch : University of Stellenbosch, 2007-03)

Nickel-Copper sulphide ores are the most important Platinum Group Metal bearing ores. The South African deposits are exceptionally rich in the platinum group metals (PGMs) and production of the PGMs is the primary purpose ...
The fundamental limits of recycling : from minerals processing to computer aided design of automobiles and other consumer goods

Reuter, Markus Andreas (Stellenbosch : Stellenbosch University, 2006-12)

My applied engineering research and industrial application work of the past 20 years is presented in this dissertation. It is the conjecture of my work that only if thorough first principles knowledge of the depth of ...
A fundamental study of the dissolution of gold from refractory ores

Lorenzen, Leon (Stellenbosch : Stellenbosch University, 1992-12)

ENGLISH ABSTRACT: The dissolution of gold from refractory ores is a complex kinetic problem involving a number of chemical, mass transport and mineralogical factors. In most Witwatersrand ores in South Africa more ...
A generic, semi-empirical approach to the stochastic modelling of bath-type pyrometallurgical reactors

Eksteen, Jacobus Johannes Reuter, M. A. Bradshaw, S. M. (Stellenbosch : University of Stellenbosch, 2004-03)

ENGLISH ABSTRACT: Bath type furnaces have become an established technology for the intensive smelting, converting and refining of primary and secondary raw materials. Since these furnaces normally have large inventories, ...
High temperature phase equilibria in the Fe-Co-Cu-Si system pertinent to slag cleaning

Banda, Wezi (Stellenbosch : University of Stellenbosch, 2006-12)

In the smelting of copper waste slags to recover cobalt and copper, the prediction of the metal liquidus temperature and the associated superheat for liquid metal handling for subsequent treatments cannot be done with ...
The influence of gas and liquid physical properties on entrainment inside a sieve tray column

Uys, Ehbenezer Chris (Stellenbosch : Stellenbosch University, 2012-12)

ENGLISH ABSTRACT: Distillation column design and operation require understanding of both the hydrodynamic and thermodynamic behaviour and limitations. One of the hydrodynamic aspects that negatively influence separation ...
An integrated approach to waste and energy minimization in the wine industry : a knowledge-based decision methodology

Musee, Ndeke (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: The importance of waste management is growing rapidly for several reasons. These reasons include the escalating cost of wastewater treatment and cleaning chemicals, an emerging trend of onerous regulatory ...