Key parameters for reliable feedstock purification

Feedstock pretreatment using a technological adsorbent always requires subsequent removal of the processing aid from the feedstock through a suitable technique.
In refineries, this is often implemented by means of leaf filters, where the adsorbent is captured in metal screens with a defined mesh, building a filter cake. A significant amount of contaminants is also removed during this step. Particle size distribution of the material used for purification is key to achieving high flowrates when dealing with a high contaminant profile.
Industrial-scale filtration typically follows a four-step process as Figure 1 shows.

Industrial filtration in detail

  1. Precoating: It is essential to cover the metal sieve with high-quality bleaching earth. If the precoat is not well produced (e.g. contains trace contaminations, gums, or fines), it could significantly reduce the filtration cycle. 

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