Browsing Doctoral Degrees (Process Engineering) by Title
Now showing items 5-24 of 71
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The bio-disposal of lignocellulose substances with activated sludge
(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 ...
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CFD analysis of solid-liquid-gas interactions in flotation vessels
(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, ...
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Characterisation and dynamic modelling of the behaviour of platinum group metals in high pressure sulphuric acid/oxygen leaching systems
(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 ...
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Characterising the effect of microwave treatment on bio-leaching of coarse, massive sulphide ore particles
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: The aim of this work was to determine if microwave treatment of a typical massive sulphide ore, prior to bio-leaching would induce micro-cracks and enhance value mineral exposure resulting in improved ...
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Characterization and optimization of an extractor-type catalytic membrane reactor for meta-xylene isomerization over Pt-HZSM-5 catalyst
(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 ...
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Cogasification of coal and biomass : impact on condensate and syngas production
(Stellenbosch : Stellenbosch University, 2012-03)ENGLISH ABSTRACT: Gasification provides a proven alternative to the dependence on petroleum for the production of high value products such as liquid fuels and chemicals. Syngas, the main product from gasification can be ...
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Computerized design of solvents for extractive processes
(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 ...
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Contributions to an improved understanding of the flotation process
(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 ...
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Development of a bioprocess for the production of an aquaculture biological agent
(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, ...
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The development of a reactor for the manufacture of zinc electrodes for a silver oxide-zinc battery
(Stellenbosch : Stellenbosch University, 2000-12)ENGLISH ABSTRACT: Silver/Zinc batteries are extensively used for applications where a power source with a high energy density is needed. A reactor was developed to manufacture the zinc electrodes for these batteries. ...
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Development of crosslinkable, thermoplastic polyurethanes for cardiovascular prostheses
(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 ...
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Development of enzyme technology for modification of functional properties of xylan biopolymers
(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 ...
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The economic feasibility of commercial biodiesel production in South Africa including analyses of important production and related parameters
(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 ...
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Effect of iron endpoint during Peirce-Smith converting on matte mineralogy and downstream processing of base and platinum-group metals
(Stellenbosch : Stellenbosch University, 2014-12)ENGLISH ABSTRACT: The process route for the production of base and platinum-group metals from natural sulfide ores commonly requires the conversion of high-iron furnace matte into an iron-lean converter matte. This is ...
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Establishing a cost effective method to quantify and predict the stability of solid rocket motors using pulse tests
(Stellenbosch : University of Stellenbosch, 2011-03)Please refer to full text to view abstract.
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Evaluation and improvement of dehydrogenation conversion and isomerization selectivity in an extractor Catalytic Membrane Reactor
(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 ...
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Evaluation and improvement of the sPC-SAFT equation of state for complex mixtures.
(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 ...
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Extraction and recovery of precursor chemicals from sugarcane bagasse, bamboo and triticale bran using conventional, advanced and fractionation pretreatment technologies
(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 ...
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A fundamental evaluation of the atmospheric pre-leaching section of the nickel-copper matte treatment process
(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 ...
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The fundamental limits of recycling : from minerals processing to computer aided design of automobiles and other consumer goods
(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 ...