Eastman-kodak Company

Philippe G Robert

Stephen J Edwards

Kevin J Parr

John Chapples

In a method for destroying one or more gases by combustion, hydrogen is used as the principal fuel in the presence of oxygen. Hydrogen is generated in situ by an electrolysis reaction.

Method and device for destroying reaction gases by incineration

A device for destroying by electro-oxidation a photographic solution having at least one photographic developer. The device comprises a) an electro-oxidation unit adapted to degrade the photographic developer into volatile organic compounds and to produce hydrogen and oxygen, b) an expansion reservoir designed to contain the gaseous mixture generated by said electro-oxidation unit; and c) a combustion unit supplied with the gaseous mixture from the expansion reservoir.

Device for destroying reaction gases by incineration

The invention concerns a process and a device for the treatment by electrolysis of used photographic solutions containing developers in an electrolytic cell comprising at least one platinum anode. The invention enables the corrosion of the platinum anode to be minimized by using an efficient quantity of antifoaming agent and keeping the pH constant at a value equal to or above 10.5 at the beginning of electrolysis. The invention enables the quantity of platinum coming from the anode in solution to be reduced.

Process for the electro-oxidation of photographic solutions

The present invention concerns a process for the electrolytic extraction of the tin found a quantity of less than 1 g/l and in a chelated form in organic solutions. The process consists of using an electrolysis unit comprising an anode compartment and cathode compartment separated by a physical barrier, introducing the organic solution into the cathode compartment and carrying out the electrolysis in galvanostatic or potentiostatic mode. This process can be applied to the recycling of photographic effluents containing tin, in particular to the processing of reversal products.

Process for extracting tin from organic solutions by electrolysis

Reference half-cell electrode

The invention relates to an Ag.sub.2 S crystalline membrane, a process for its manufacture, and a process for its use in detecting silver ions or halide ions. The membrane according to the invention comprises silver sulfide doped with an ion capable to form either with Ag.sup.+ or with S.sup.2- a salt much more insoluble than the species in solution. Preferably the membrane further contains an inert hydrophobic compound. The membrane is prepared by coprecipitating silver sulfide with the doping agent, by homogenizing the coprecipitate with the hydrophobic compound and by pressing. The membrane can be used in an electrode to detect silver or halide ions in solution.

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Givry, France

Philippe G Robert