Chemistry: electrical and wave energy – Processes and products – Electrophoresis or electro-osmosis processes and electrolyte...
Patent
1997-08-18
1999-05-25
Gorgos, Kathryn
Chemistry: electrical and wave energy
Processes and products
Electrophoresis or electro-osmosis processes and electrolyte...
204541, 204630, 204252, 204253, 204258, 204265, 205431, 205551, 205552, 205338, 205349, C25B 700, C25B 900, C25B 300, C25B 100
Patent
active
059067225
ABSTRACT:
Describes a method of electrochemically converting amine hydrohalide, e.g., ethyleneamine hydrochloride, into free amine, e.g., free ethyleneamine. A three compartment electrolytic cell is provided having (1) a catholyte compartment containing a cathode assembly comprising a cathode and an anion 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) an intermediate compartment separated from the catholyte and anode compartments by the anion exchange membrane and either (i) the hydrogen consuming gas diffusion anode or (ii) the hydraulic barrier respectively. An aqueous solution of amine hydrohalide is charged to the catholyte compartment, while hydrogen gas is charged to the anode compartment and an aqueous conductive electrolyte solution is charged to the intermediate compartment. Direct current is passed through the electrolytic cell and an aqueous solution comprising free amine is removed from the catholyte compartment.
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Foller Peter C.
Roberts David G.
Tang Robert H.
Franks James R.
Gorgos Kathryn
PPG Industries Inc.
Stein Irwin M.
Wong Edna
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