In this work, the use of a spinning disk reactor as a unit for a reaction-precipitation process is investigated. An experimental study is reported concerning the precipitation of barium sulfate from aqueous solutions at 25 °C on a spinning disk of 0.5 m in diameter. At a rotational speed higher than 900 rpm, spontaneous precipitation took place and crystals ∼0.7 µm in size were produced. At a supersaturation ratio of 2000, the number of generated crystals is comparable with those reported in the literature when a T-mixer is used, but in the case of the spinning disk, a much lower specific dispersed power is required.

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A new heterogeneous catalyst based on a chemically modified mesoporous silica gel and possessing immobilised chromium ions has been prepared and successfully applied to the aerial oxidation of alkyl aromatics at atmospheric pressure and in the absence of solvent.