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Fig. 10.6 Oscillations observed in an experiment with a lab-scale methyl formate column: 45 bubble cap trays, feed at tray 23

Fig. 10.6 Oscillations observed in an experiment with a lab-scale methyl formate column: 45 bubble cap trays, feed at tray 23

Sustained oscillation could not be found by means of continuation analysis for the lab-scale methyl formate column. However, oscillations have been observed during experimental investigations by Reder [87] as displayed in Fig. 10.6. Various temperature readings in the reboiler and on different trays are shown in the lower diagram. A step change in heat duty is applied at time 0. Large amplitude temperature oscillations with a period of about 0.3 h can be observed before and after the step change. The oscillations have been reproducible in various experiments. No source of external excitation could be located. An explanation of the phenomenon has not yet been achieved, however.

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