Abstract: A method of removing unwanted molecules from blood includes (i) directing a flow of blood from a patient through a first hemofilter, (ii) removing a volume of fluid from the blood using the first hemofilter, (iii) combining a volume of first substitution fluid with an outflow from the first hemofilter, the volume of first substitution fluid being substantially equal to the volume of fluid removed from the blood using the first hemofilter, (iv) directing the combined first hemofilter outflow and the first substitution fluid volume from the first hemofilter through a second hemofilter, (v) combining a second substitution fluid with outflow from the second hemofilter, and (vi) returning the combined second hemofilter outflow and the second substitution fluid volume from the second hemofilter to the patient.

Abstract: A multi-part substitution infusion fluid for an extracorporeal blood treatment and methods for using same are provided. Generally, the multi-part substitution fluid comprises a first solution composed of electrolites but without divalent cations and a second solution comprising divalent cations. Another embodiment includes a third solution comprising a matching citrate/citric acid anticoagulant. The described methods of using the multi-part substitution infusion fluids significantly reduce risks associated with various extracorporeal blood treatments.

Abstract: A process for the purification of a vinyl chloride polymer containing a compound of a heavy metal by: (a) dissolving the PVC in a solvent; (b) treating the solution with at least one additive capable of adsorbing or of forming a complex with the compound of the heavy metal; (c) centrifuging the treated solution to precipitate the adsorbed or complexed compound of the heavy metal; and (d) separating the precipitate from the PVC solution.

Abstract: Process for the purification of a vinyl chloride polymer (PVC) comprising at least one compound of a heavy metal, according to which: (a) the PVC is dissolved in a solvent; (b) the solution is treated with at least one additive capable of adsorbing or of forming complexes with the compound of the heavy metal; (c) the solution treated is subjected to centrifuging, so as to precipitate the adsorbed or complexed compound of the heavy metal; and (d) the precipitate is separated from the PVC solution.