イオン交換樹脂を成形した円柱状ペレットの触媒活性

概要

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Since the diameters of conventional ion-exchange resin particles are less than 1 mm, the pressure drop may be very high in fixed-bed reactors packed with resin particles. Cylindrical pellets with diameters of 3-5 mm were made by mixing resin particles with binding powders and heating to 140°C. To compare catalytic activities of these resin pellets with those of resin particles, the hydrolysis of ethyl formate was carried out in a batch reactor.<BR>For the resin particles, the effect of diameter on catalytic activity could be explained by the usual effectiveness factor. On the other hand, the activity for the resin pellets was independent of the diameter of the resin pellets, although it was dependent on the diameter of the constituent resins (that is, raw resins used to make pellets). The decrease of activity was 16% for resin pellets independently of the diameter of the constituent resins. This means that the decrease of activity was not caused by the diffusional resistance in the void among the constituent resins, but by the blockage of the binder on the surface of constituent resins. These pellets are very useful as ion-exchange resins for packings of fixed beds because both the intraparticle diffusion resistance and the pressure drop can be reduced.
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