Polimeri Europa S.p.a.

Versalis S.p.a.

Lucia Bonoldi

Paolo Biagini

Liliana Gila

Mario Salvalaggio

Franco Cambisi

A process is described for the purification of lanthanide carboxylates which comprises a step in which the hydrocarbon solution deriving from the synthesis of lanthanide carboxylate, containing said carboxylate and impurities of the corresponding carboxylic acid and/or water, is treated with an aqueous solution of a base in order to obtain a pH of the aqueous phase ranging from 9.0 to 12.2 and/or a step in which the hydrocarbon solution containing lanthanide carboxylate is treated with a solid selected from NaSO, MgSO, Mg(ClO), molecular sieves 3 &#x212b;, molecular sieves 4 &#x212b;, molecular sieves 5 &#x212b; and molecular sieves 13 X. Analytical methods are also described, which allow the purity of the lanthanide carboxylates to be non-destructively measured.

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Milan, Italy

Lucia Bonoldi