Patent ID: 7951970

Claim:
A process for recycling metallocene catalyst components, comprising: (a) recovering a cyclopentadienyl or a bridged biscyclopentadienyl derivative from a filtrate, mother liquor, reaction residue, and/or a work-up residue obtained in the preparation of a metallocenes and/or in the preparation of a bridged biscyclopentadienyl ligand; and (b) purifying the recovered derivative by liquid-solid chromatography; wherein the cyclopentadienyl derivatives are recovered from the filtrates, mother liquors, reaction residues and/or work-up residues obtained in the preparation of metallocenes and/or in the preparation of bridged biscyclopentadienyl ligands by subjecting these filtrates, mother liquors, reaction residues and/or work-up residues, either together or independently of one another, to a single or multiple, acidic or basic aqueous treatment in which any bonds present between bridging silicon atoms and cyclopentadienyl rings are cleaved, and subsequently isolating and, optionally, concentrating the organic phase comprising the cyclopentadienyl derivatives in order for them to be able to be purified further in the liquid-solid chromatography.