PQ’s specialty adsorbents are specially designed silica gels, known world-wide under the flagship name BRITESORB®. Silica gels are a form of silicon dioxide, SiO2, the same material that occurs in nature as sand. The difference between sand and silica gel is that sand is a crystalline, non-porous form, where as silica gels are non-crystalline and highly porous. By changing sand into a porous material, we create an enormous internal surface area on which certain materials are selectively adsorbed. By carefully controlling the size and surface characteristics of the pores, we can make a silica gel adsorb only those constituents we want to remove.
PQ’s BRITESORB® gels are used in the brewing industry to prevent “chill haze” in beer. They are also used for treating used cooking oils to remove contaminants.