Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Preparing inorganic compound
Patent
1997-08-18
1999-05-18
Phasge, Arun S.
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Preparing inorganic compound
205552, 205338, 205349, 204537, 204541, 204539, 204630, 204631, 204252, 204257, 204258, 204265, 204253, C25B1/00;3/00;7/00;9/00
Patent
active
059048298
ABSTRACT:
Describes a method of electreochemically converting amine hydrohalide, e.g., amine hydrochloride, into free amine, e.g., free ethyleneamine. An electrolytic cell is provided having (1) a catholyte compartment containing a cathode assembly comprising a cathode and a bipolar ion exchange membrane, (2) an anode compartment containing an anode assembly comprising either (a) a hydrogen consuming gas diffusion anode and a current collecting electrode or (b) a hydrogen consuming gas diffusion anode which is fixedly held between a hydraulic barrier and a current collecting electrode, and (3) at least one pair of intermediate compartments separating the catholyte and anode compartments and separated from each other by an anion exchange membrane. The following are introduced into the cell: a first aqueous conductive electrolyte solution into the catholyte compartment; hydrogen gas into the anode compartment; an aqueous solution of amine hydrohalide into the first compartment of the pair of intermediate compartments; and a second aqueous conductive electrolyte solution into the second compartment of the pair of intermediate compartments. Direct current is passed through the electrolytic cell, and an aqueous solution comprising free amine is removed from the first compartment.
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Foller Peter C.
Roberts David G.
Tang Robert H.
Franks James R.
Phasge Arun S,.
PPG Industries Inc.
Stein Irwin M.
Wong Edna
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