Patent ID: 7332086
Filing Date: 2008-02-19
Classification: B01D,B01J

Abstract:
1. A method of preparing a separation medium starting with an aqueous solution of essentially spherical primary particles of a defined size, comprising the following steps: a) inverse suspension dispersing into oil said aqueous solution of functionalised primary particles to form a droplet in oil dispersion; b) evaporating to remove water in said aqueous solution dispersion and to encourage fusion between particles to form spherical aggregates, wherein the fusion is between functional groups on the primary particles and the fusion is caused by a water-soluble polymer and a cross-linker; c) size fractionating of aggregates from step b); and optionally d) suspending the aggregates from step c) in aqueous solution and repeating steps a) to c) an optional number of times to form progressively larger spherical aggregates.