METHOD FOR PREPARING PRECIPITATED SILICA HAVING A SPECIFIC MORPHOLOGY, PARTICLE SIZE, AND POROSITY

摘要

The invention relates to a method for preparing precipitated silica formed by clusters of large primary silica particles having small primary silica particles on the surface thereof, wherein the acid used in at least one of the steps of said method is a concentrated acid, preferably selected from the group consisting of: sulfuric acid having a concentration of at least 80 wt %, in particular at least 90 wt %; acetic acid or formic acid having a concentration of at least 90 wt %; nitric acid having a concentration of at least 60 wt %; phosphoric acid having a concentration of at least 75 wt %; and hydrochloric acid having a concentration of at least 30 wt %.