Browsing Research Articles (Chemical Engineering) by Issue Date

Browsing Research Articles (Chemical Engineering) by Issue Date

Sort by: Order: Results:

  • Fast underwater bonding to polycarbonate using photoinitiated cyanoacrylate 
    Cloete, William Edward; Focke, Walter Wilhelm (Elsevier, 2010-06)
    Rapid underwater bonding of clear polycarbonate to metal or plastic substrates at temperatures approaching 0 °C was studied. Bonding was achieved within minutes using ethyl 2-cyanoacrylate gel cured using the photoinitiator ...
  • Alkyl ammonium intercalation of Mozambican bentonite 
    Massinga, Pedro Horacio; Focke, Walter Wilhelm; De Vaal, Philip L.; Atanasova, Maria Todorova (Elsevier, 2010-07)
    Organo-bentonites containing quaternary ammonium surfactants were prepared using purified bentonite from the Boane deposit in Mozambique. The intercalation was effected by intimate mixing of the surfactants into a concentrated ...
  • Thermal properties of sodium-exchanged Palabora vermiculite 
    Muiambo, Herminio Francisco; Focke, Walter Wilhelm; Atanasova, Maria Todorova; Van der Westhuizen, Isbe; Tiedt, Louwrens R. (Elsevier, 2010-09)
    Palabora “vermiculite” represents an interstratified vermiculite-biotite containing less than 50% vermiculite. The sodium-exchanged form was prepared by immersion in saturated brine at ambient conditions. The sodium content ...
  • Desalination/concentration of reverse osmosis and electrodialysis brines with membrane distillation 
    Osman, M.S.; Schoeman, J.J. (Jakob Johannes); Baratta, L.M. (European Desalination Society, 2010-12)
    Brines produced by desalination processes such as reverse osmosis (RO), electrodialysis reversal (EDR) and ion-exchange (IX) holds pollution potential for the water environment if not properly handled. These brines contain ...
  • Influence of hydrating agents on the hydration of industrial magnesium oxide 
    Matabola, Kgabo P.; Van der Merwe, E.M. (Elizabet Margaretha); Strydom, C.A. (Christiena Adriana); Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus) (Wiley-Blackwell, 2010-12)
    BACKGROUND: The influence of different hydrating agents on the pH of the hydrating solutions, rate of hydration of MgO to Mg(OH)2 and product surface area was studied as a function of temperature of hydration. Hydrating ...
  • Eksperimentele bepaling en modellering van vloeistofgas-ewewigsdata in die C2F4-C3F6-s-C4F8-sisteem 
    Conradie, Francois Jacobus (Suid Afrikaanse Akademie vir Wetenskap & Kuns, 2011)
    The vapour-liquid equilibrium data for the C2F4-C3F6-s-C4F8 system are presented. Each binary system was evaluated at three isotherms. The experimental data will be correlated to the Peng-Robinson equation of state, ...
  • Gas-limited hydrogenation of 1-Octene in a fixed bed : upflow versus downflow 
    Reynders, Fritz; Nicol, Willie (American Chemical Society, 2011)
    Two downflow operational modes with different hydrodynamic states were compared to upflow operation. Various gas limited conditions (γ = 15 - 60) were employed. The downflow mode with the higher wetting efficiency ...
  • The effect of Si-Bi2O3 on the ignition of the Al-CuO thermite 
    Ilunga, K.; Del Fabbro, Olinto; Yapi, L.; Focke, Walter Wilhelm (Elsevier, 2011-01)
    The ignition temperature of the Al–CuO thermite was measured using DTA at a scan rate of 50 °C min−1 in a nitrogen atmosphere. Thermite reactions are difficult to start as they require very high temperatures for ignition, e.g. ...
  • Poly(ethylene-vinyl co-vinyl acetate)/clay nanocomposites : mechanical, morphology, and thermal behavior 
    Joseph, Susan; Focke, Walter Wilhelm (Wiley, 2011-02)
    Nanocomposites of ethylene-vinyl acetate copolymer (EVAL) with Dellite organoclay were prepared in a laboratory extruder. The extent of intercalation of the nanocomposites was studied by field emission scanning electron ...
  • Leachability of nitrided ilmenite in hydrochloric acid 
    Swanepoel, J.J.; Van Vuuren, D.S.; Heydenrych, Mike D. (Southern African Institute of Mining and Metallurgy, 2011-03)
    Titanium nitride in upgraded nitrided ilmenite (bulk of iron removed) can selectively be chlorinated to produce titanium tetrachloride. Except for iron, most other components present during this low temperature (ca. ...
  • Titanium production via metallothermic reduction of TiCL4 in molten salt : problems and products 
    Van Vuuren, D.S.; Oosthuizen, S.J.; Heydenrych, Mike D. (Southern African Institute of Mining and Metallurgy, 2011-03)
    Industrial production of titanium occurs via the batch-wise reduction of titanium tetrachloride (TiCl4) with a reducing metal, being magnesium in the Kroll process, or sodium in the Hunter process. In the search for low ...
  • Determination of pectin content of eucalyptus wood 
    Coetzee, Berdine; Schols, Henk A.; Wolfaardt, Francois (Walter de Gruyter, 2011-04)
    Very little is known about the occurrence of pectin in wood and it is speculated that between 10 mg g-1 and 40 mg g-1 of wood consists of pectin. The present study aimed to quantify pectin in eucalyptus wood and to ...
  • Parallel hydrogenation for the quantification of wetting efficiency and liquid-solid mass transfer in a trickle-bed reactor 
    Van Houwelingen, Arie Jan; Nicol, Willie (Wiley, 2011-05)
    A novel method for the measurement of wetting efficiency in a trickle-bed reactor under reaction conditions is introduced. The method exploits reaction rate differences of two first-order liquid-limited reactions occurring ...
  • Treatment of TRISO-coated particles with CF4 in a low temperature plasma 
    Van der Walt, Izak Jacobus; Nel, Johannes T.; Crouse, Philippus L.; Jansen, Arnold Alexander; Kekana, Sipho J. (Elsevier, 2011-06)
    An alternative recovery method to the mechanical crushing of off-specification tri-structural-isotropic (TRISO) coated fuel microspheres is demonstrated. It is shown that the inert SiC layer can be completely removed by ...
  • Suppressing H2 evolution by silicon powder dispersions 
    Tichapondwa, Shepherd Masimba; Focke, Walter Wilhelm; Del Fabbro, Olinto; Mkhize, Sfiso S.; Muller, E. (Taylor & Francis, 2011-07)
    Silicon dispersions in water are used to produce pyrotechnic time delay compositions. The propensity of the silicon to react with water and to produce hazardous hydrogen gas must be suppressed. To this end, the effect ...
  • Polypropylene-based long-life insecticide-treated mosquito netting 
    Focke, Walter Wilhelm; Van Pareen, Walter (Walter de Gruyter, 2011-10)
    Malaria causes approximately one million deaths a year and more than 300 million cases of severe illness. The World Health Organization (WHO) regards insecticide-treated nets (ITNs) as an important component in its ...
  • Degradation of insecticides used for indoor spraying in malaria control and possible solutions 
    Sibanda, Mthokozisi Mayibongwe; Focke, Walter Wilhelm; Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus); Moyo, Lumbidzani; Nhlapo, N.S. (Nontete Suzan); Maity, Arjun; Muiambo, H.F. (Herminio Francisco); Massinga, Pedro Horacio; Crowther, N.A.S. (Nicolaas Andries Sadie), 1944-; Coetzee, Maureen; Brindley, Gordon W.A. (BioMed Central, 2011-10-18)
    BACKGROUND: The insecticide dichloro-diphenyl-trichloroethane (DDT) is widely used in indoor residual spraying (IRS) for malaria control owing to its longer residual efficacy in the field compared to other World ...
  • Two dimensional fluidised bed reactor : performance of a novel multi-vortex distributor 
    Brink, Hendrik Gideon; Saayman, Jean; Nicol, Willie (Elsevier, 2011-11)
    The influence of the distributor configuration on interphase mass transfer, gas axial dispersion and bubble size was studied in a 2-D fluidised bed reactor for two types of distributor configurations; a novel multi-vortex ...
  • Effect of fines content on bubble properties in a two-dimensional fluidized bed by digital image analysis 
    Van Biljon, C.; Du Toit, Elizabeth Louisa; Nicol, Willie (South African Institute of Chemical Engineers, 2012)
    The effect of fines content in fluid catalytic cracking (FCC) catalyst on bubble properties was investigated by considering two catalyst batches. One contained fewer fines and had a Sauter mean diameter of 83 μm while the ...
  • 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 ...