Browsing by Author "Schwarz, Cara E."

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    The effect of fluid properties and packing size on the hydrodynamics of packed columns
    (AIDIC, 2018) Minne, Ulrich L.; Burger, Andries J.; Schwarz, Cara E.
    ENGLISH ABSTRACT: The effect of fluid physical properties on the hydrodynamic behaviour in a packed column with 1.5” and 2.5” fourth generation random packing was investigated by measuring the pressure drop and liquid hold-up. Experimental data for combinations of four liquids and two gases were measured for both packings in a pilot plant setup with a column inside diameter of 393 mm and a packed bed height of 3 m. Liquid superficial flow rates in the range of 6 – 122 (m³/h)/m² and gas rates up to the flooding point were considered. The results provide significant extended information on how fluid properties affect the hydrodynamic behaviour in randomly packed columns. As expected, larger packing pieces enable higher hydrodynamic throughputs. However, the choice of packing size remains a balance between improved capacity (larger packing) and improved separation efficiency (smaller packing).
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    Hydrodynamics of a packed column operated under supercritical conditions
    (AIDIC, 2018) Franken, Hendrik H.; Knoetze, Johannes H.; Schwarz, Cara E.
    ENGLISH ABSTRACT: There is a lack of hydrodynamic data under supercritical conditions, in particular in systems that attempt to isolate hydrodynamics from mass transfer. This paper presents hydrodynamic data focusing on the characterization of flooding. Two different flooding phenomena are identified using the column overheads, pressure drop and liquid hold-up of the system. It is further noted that the saturated fluid properties of density and dynamic viscosity play a significant role in flooding. A density difference of less than 250 kg/m3 between phases and a decrease in liquid viscosity causes a shift from classical gas-liquid flooding to behaviour more analogous to that of liquid-liquid extraction columns.