Mass transfer performance of modular catalytic structured packing
نویسندگان
چکیده
A mechanistic, parallel channel model was developed and validated experimentally to enable the prediction of mass transfer performance of the Katapak-SP, a novel, modular catalytic structured packing. Total reflux distillation experiments were carried out at atmospheric pressure in a column with internal diameter of 0.45 m, using aqueous (Methanol/Water) and organic (Cyclohexane/n-Heptane) test systems. With the latter, two types of Katapak-SP were tested. In the pre-loading region of operation, the KatapakSP12 packing exhibited with the aqueous system a constant and significantly better efficiency (HETP ~ 0.27 m) than with the organic system (HETP ~ 0.35 m). Under the same conditions, Katapak-SP11 appeared to be less efficient (HETP ~ 0.5 m). This is mainly due to a pronounced liquid maldistribution inside the closed flow channels, and best performance in both cases was reached upon onset of loading, when vapour phase forces liquid collected at transitions between packing layers to spread laterally. With both phases distributed evenly a peak in efficiency is achieved, and upon onset of flooding the efficiency starts to deteriorate strongly. The proposed Delft MCSP model, assuming plug flow of both phases, appeared to be too optimistic in the preloading region, but well capable of predicting the (best) mass transfer performance as observed around the loading point of the packed bed.
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