Adsorbants of active substances based on silica

摘要

An active agent adsorbate based on silicic acid contains precipitated silicic acid (PSA) and an active agent (AA). An Independent claim is included for the preparation of the absorbate by: (i) fluidizing a PSA filter cake to give a suspension of pH 1-5; (ii) spraying or jetting the suspension together with AA into a fluidized bed obtained using hot air (preferably after adding AA to the suspension); (iii) recovering granules of the required particle size; (iv) optionally removing fines; (v) adjusting the pH of the granulate or adsorbate to 5.5-8.5 (preferably 6-7.5); and (vi) optionally sieving to provide a predetermined average particle size.