Hydrodynamic Studies in Fischer-Tropsch Derived Waxes in A Bubble Column

Dragomir B. Bukur, Snehal A. Patel, Raphael Matheo

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21 Citations (Scopus)


Gas hold-up and Sauter mean bubble diameter measurements were made in a 0.051 m diameter by 3 m long glass bubble column in the system, nitrogen-molten wax, with three different waxes (paraffin wax FT-300, Sasol’s Arge wax and Mobil’s reactor wax). Paraffin wax has a tendency to foam and gas hold-up is a strong function of gas distributor type, temperature and start-up procedure, whereas the reactor waxes do not foam and are much less affected by these variables. In experiments at 265&C with a 1.85 mm single hole orifice plate distributor the gas hold-ups were nearly the same for all three waxes. However, significant differences in Sauter mean bubble diameters were obtained in experiments with different waxes; FT-300 wax produced the smallest Sauter mean bubble diameters whereas Mobil’s reactor wax produced the largest bubbles. Addition of 1-octadecanol and octadecanoic acid (up to 10wt%) to the FT-300 paraffin wax caused an increase in gas hold-up and a delav in the foam break-un in runs at 265°C with the 1.85 mm orifice nlate distributor.

Original languageEnglish
Pages (from-to)63-78
Number of pages16
JournalChemical Engineering Communications
Issue number1-6
Publication statusPublished - Oct 1987



  • Bubble column
  • Fischer-Troosch synthesis
  • Gas hold-uo _
  • Sauter bubble diameter

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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