Eastman-kodak Company

Tech-sep

Christian G Guizard

Didier J Martin

Jean-Francois Diaz

Danielle Marie Wettling

Andre Grangeon

Christian L Lurin

Jean H Durand

Pascale Lacan

H&eacute;l&egrave;ne C Lecacheux

Anne Boye

A method for selectively extracted species from an aqueous solution which comprises contacting the aqueous solution with a membrane capable of selectively transporting species from a liquid to another, the membrane comprising a porous polymer support having an average surface pore size less than 100 nm, coated with a continuous layer of a fluorinated polymer obtained by plasma energized chemical vapor deposition (PECVD) using a plasma containing at least one fluorinated compound.

Method for treating an aqueous solution containing ionic species to be extracted selectively

The invention concerns a method and a device for the selective extraction of the halide ions from photographic baths. According to the invention, the solutions to be treated are subjected to a first nanofiltration step 2 in diafiltration mode, then to a second nanofiltration step 3 in concentration mode. The method makes it possible to prolong the activity of the fixing or bleaching/fixing baths during the processing of photographic products.

Method for regenerating seasoned aqueous fixing or bleach/fixing

The invention concerns a method and a device for extracting the halide ions from fixing or bleaching/fixing photographic solutions containing mainly thiosulfate as the fixing agent, bringing the solutions into contact with a nanofiltration module including at least two membranes of different types. The method enables the activity of the fixing or bleaching/fixing baths to be extended during the processing of photographic products.

Method and device for the selective extraction of halide ions from

The invention relates to membranes for facilitated ion transport in aqueous solutions. The membrane is an adduct of a heteropolysiloxane and a crown-ether, and contains certain ions such as picrate or fluoroborate. This membrane is efficient for the selective transport of potassium ions.

Membranes for ion transport and method for obtaining them

Mechanically strong and thermally/chemically-resistant composite nanofiltration membranes, well adapted for the separation of low molecular weight compounds, comprise a porous inorganic support substrate, the pore diameters of which ranging from 3 to 10 nm, this inorganic support substrate having a polymer membrane which comprises an elastomeric polyphosphazene densely deposited on at least one of the face surfaces thereof, the structural porosity of such polyphosphazene membrane ranging from 0.2 to 2 nm.

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Montpellier, France

Christian G Guizard