Browsing Chemical Engineering by Title

Browsing Chemical Engineering by Title

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  • Modelling the mechanisms that govern the oxidation of graphite 
    Badenhorst, Heinrich (University of Pretoria, 2012-05-02)
    The Pebble Bed Modular Reactor (PBMR) design is one of the High Temperature Gas Cooled Reactors (HTGR) under the Generation IV initiative. These designs incorporate numerous inherent passive safety features. Graphite is ...
  • Modelling the photocatalytic degradation kinetics of organochloride chemicals in aqueous solutions 
    Khuzwayo, Zakhele Siyanda Prince (University of Pretoria, 2012-10-01)
    Polychlorinated endocrine disrupting chemicals are environmental pollutants that are increasingly found in water sources. As a result of their hydrophobic properties, they generally accumulate in adipocytes of humans and ...
  • Modelling the thermal degradation and stabilisation of PVC in a torque rheometer 
    Fechter, Reinhard Heinrich; Sandrock, Carl; Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus) (De Gruyter, 2018-04)
    A novel method for simulating the torque and temperature curves from a torque rheometer thermal stability test on poly(vinyl chloride) (PVC) was developed. A mathematical model was proposed which combines the chemical kinetics ...
  • Modelling U(VI) reduction by Pseudomonas stutzeri 
    Chabalala, Simphiwe; Chirwa, Evans M.N. (AIDIC - The Italian Association of Chemical Engineering, 2012)
    Pseudomonas stutzeri, a facultative anaerobe sourced from soil in a uranium mine in Limpopo, South Africa, reduced uranium-6 (U(VI)) to uranium-4 (U(IV)) in batches under a relatively high initial U(VI) concentration ...
  • Modification of a commercial poly (VDF-co-HFP) copolymer latex 
    Naidoo, Sarnia (University of Pretoria, 2019)
    Fluorinated polymers are niche macromolecules that play an essential role in modern life. The special properties of fluorine, including among others, a large electronegativity (ca 3.98), low polarisability, small van der ...
  • Modification of Functional Groups on the Surface of Carbon Materials 
    Roberson, Albert (University of Pretoria, 2018)
    A promising energy harvesting technique involves the use of thermal nanofluids, capable of collecting solar UV/visible radiation and storing it as latent heat in phase change materials (PCM), i.e. molten salts. Carbon-based ...
  • Modification of layered double hydroxides using first-row transition metals for superior UV-Vis-NIR absorption and the influence of the synthesis method used 
    Gevers, Bianca R.; Naseem, Sajid; Sheppard, Charles J.; Leuteritz, Andreas; Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus) (American Chemical Society (ACS), Chinese Chemical Society, Chemical Society of Japan, German Chemical Society (GDCh) and the Royal Society of Chemistry, 2020-02)
    Layered double hydroxides (LDHs) with high and tailorable UV-Vis-NIR absorption were prepared through transition metal (TM) modification. The synthesis method used and amount of TM present were found to influence the ...
  • The modification of Waxy Oil for preparing a potential feedstock for needle coke production 
    Clark, John Graham (University of Pretoria, 2011)
    This research study determines the potential to increase substantially the anisotropy of a coke from an aliphatic Waxy Oil produced by Sasol Synfuels at Secunda, South Africa. Experimental modifications included filtration, ...
  • Modified layered double hydroxides as PVC heat stabilisers 
    Royeppen, Mikhail David (University of Pretoria, 2017)
    Hydrotalcite (HTC) was intercalated with different aromatic carboxylic acids via two synthesis methods: reconstruction and co-precipitation. The reconstruction method involves the rehydration of the products of LDH ...
  • The morphology of solid-liquid contacting efficiency in trickle-bed reactors 
    Van Houwelingen, Arjan J (University of Pretoria, 2007-05-02)
    Trickle-flow is traditionally modeled by means of hydrodynamic parameters such as liquid holdup, two-phase pressure drop and wetting efficiency. Several studies showed that these parameters are not only a function of flow ...
  • The Morphology of Trickle Flow Liquid Holdup 
    Van der Merwe, Werner (University of Pretoria, 2006-02-17)
    Gravity driven trickle flow of a liquid over a fixed bed in the presence of a gaseous phase is widely encountered throughout the process industry. It is one of the most common ways of contacting multi-phase fluids for ...
  • Mosquito repellent microporous polyolefin strands 
    Mapossa, António Benjamim; Focke, Walter Wilhelm; Sitoe, Alcides Everildo José; Androsch, Rene (American Institute of Physics, 2020-11)
    Pyrogenic silica and organoclay nanocomposite strands containing liquid mosquito repellents were prepared by twinscrew extrusion compounding. The mosquito repellents DEET and Icaridin were immobilized in the pores of a ...
  • Mosquito repellent thermal stability, permeability and air volatility 
    Mapossa, António Benjamim; Sitoe, Alcides Everildo José; Focke, Walter Wilhelm; Izadi, Homa; Du Toit, Elizabeth Louisa; Androsch, Rene; Sungkapreecha, Chanita; Van der Merwe, E.M. (Elizabet Margaretha) (Wiley, 2020-03)
    Please read abstract in the article.
  • Multi-Vortex distributor : effect on 2-D fluidized bed reactor performance 
    Brink, Hendrik Gideon (University of Pretoria, 2011)
    The influence of the distributor configuration on the mass transfer and bubble sizes in a 2-D FBR was studied for two types of distributor configurations: <ul><li> A novel multi-vortex (MV) distributor with tuyéres directed ...
  • A multiphysics simulation of a fluorine electrolysis cell 
    Pretorius, Ryno; Crouse, Philippus L.; Hattingh, Christiaan J. (AOSIS OpenJournals, 2015-07)
    We modelled a laboratory-scale fluorine reactor which employed fully coupled, fundamental electron, heat, mass and momentum transfer (two-phase) equations to deliver a transient simulation. Hydrodynamic quasisteady- state ...
  • Nano-graphite as a functional additive for rotationally mouldable polymers and phase change materials for energy storage 
    Mhike, Washington (University of Pretoria, 2016)
    The overall aim of this study was to obtain a facile method of synthesizing graphite nanoplatelets from commercial expandable graphite and use these as functional fillers in rotational moulding applications and phase change ...
  • Nie-verrekenbare water van waterverspreidingsnetwerke (Afrikaans) 
    Koschade, Wilhelm (University of Pretoria, 2013-04-05)
    Hierdie verhandeling handel oor Nie-verrekenbare water (NVW) van pypnetwerkstelsels, oorsake wat daartoe lei sowel as die verskillende faktore wat daarby betrokke is. Verskillende wyse waarop die NVW van 'n netwerk bepaal ...
  • Niobium and tantalum beneficiation using gas-phase fluorination 
    Pienaar, A.D. (University of Pretoria, 2014)
    The processing of minerals containing tantalum and niobium is a challenge that has most modern researchers focused on optimising the processes that have already reached scientific maturity. Ore digestion in aqueous mixtures ...
  • Niobium and tantalum separation by gas-phase fluorination 
    Pienaar, A.D.; Wagener, J.B.; Crouse, Philippus L. (Elsevier, 2012-11)
    The separation of tantalum and niobium compounds has been of interest for many years, with few new developments. Classically separation is achieved by liquid–liquid extraction and most research focuses on optimising this ...
  • Nitrate-nitrogen removal with small-scale reverse osmosis, electrodialysis and ion-exchange units in rural areas 
    Schoeman, J.J. (Jakob Johannes) (Water Research Council, 2009-10)
    The nitrate-nitrogen concentration in water supplied to clinics in Limpopo Province is too high to be fit for human consumption (35 to 75 mg/ℓ NO3-N). Therefore, small-scale technologies (reverse osmosis, ion-exchange and ...