Browsing Chemical Engineering by UP Author "De Vaal, Philip L."

Browsing Chemical Engineering by UP Author "De Vaal, Philip L."

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  • 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 ...
  • A holistic approach to control and optimization of a PGM concentrate flash drying unit 
    De Clerk, D.J.; De Vaal, Philip L. (Southern African Institute of Mining and Metallurgy, 2012-04)
    Global trends stipulate the need to optimize existing assets while reducing environmental impacts. This paper illustrates the procedure that was followed to achieve such goals at one of the coal burning flash dryer units ...
  • An investigation into lubrication and oxide breakdown during load-carrying capacity testing 
    Moller, Vivian P.; De Vaal, Philip L. (Taylor & Francis, 2014-09)
    Changes occurring in the friction and wear mechanisms during a load-carrying capacity test, lubricated with cetane containing a carboxylic acid, were investigated. The changes in wear scar/track appearance and oxide ...
  • Using MV overshoot as a tuning metric in choosing DMC move suppression values 
    Gous, Gustaf Zacharias; De Vaal, Philip L. (Elsevier, 2012-09)
    Traditionally the tuning of dynamic matrix control (DMC) type multivariable controllers is done by trial and error. The APC engineer chooses arbitrary starting values and tests the performance on a simulated controller. ...