Feed particle utilisation

In the powder doser, limestone with a median particle size of about 12 pm is used. The flow rate of the stream is metered and used to control the limestone feed rate into a slurrying chamber. The resulting suspension is then discharged into the stream. Limestone utilisation rates, however, are only about 50 %. 

The catalyst distribution inside the PBMR is the critical parameter in enhancing MR performance. The utilisation of catalyst s active phase during the reaction in accordance with the membrane separation of desired components will affect positively. For example, to have well-mixed fluid phases no interphase mass transfer or diffusional resistance during the reaction and separation should occur (Yeung et al, 1994). In the PBMR the active catalyst pellets are distributed inside the membrane module on the feed side as in the conventional FBR. In the CMR the active catalyst particles and sites are located within the membrane. Morbidelli et al. (2001) have reported a non-uniform catalyst distribution and its optimal bed location in the PBMR or an inert membrane reactor with a catalyst on the feed side (IMRCF) and in the CMR. In the case of a non-uniform catalyst distribution, that is. 

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