High temperature and low feed acid concentration operation of HC

Details High temperature and low feed acid concentration operation of HC High temperature and low feed acid concentration operation of HC

1980-05-14

1981-10-13

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204263, 204266, C25B 126, C25B 900

Patent

active

042946719

ABSTRACT:
An HCl electrolyzer utilizing a membrane with catalytic electrodes physically bonded to the surfaces of the membrane is provided with an electron current conducting structure which comprises an array of individual current conducting elements contacting the electrode. The cell is operated at high temperatures (60.degree.-90.degree. C.) to take advantage of the reduction of electrode overpotential at these temperatures but with low feed acid concentrations (.ltoreq.9M) to minimize hydrogen chloride in the chlorine, i.e, HCl vapor pressure is below 0.1 atmospheres--76 Torr. There is also a large decrease in membrane resistance as temperature is increased. Simultaneously O.sub.2 evolution is suppressed to maintain O.sub.2 content in the chlorine at 0.1% or less.

REFERENCES:
patent: 4056452 (1977-11-01), Campbell
patent: 4057479 (1977-11-01), Campbell
patent: 4191618 (1980-03-01), Coker et al.

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