Electrochemical process for the removal of residual nitric acid from aqueous hydroxylammonium nitrate
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United States of America Patent
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Feb 21, 1995
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N/A
app pub date -
Jul 20, 1994
filing date -
Jul 20, 1994
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Abstract
The present invention relates to an electrochemical process for the removal of excess or residual nitric acid from aqueous hydroxylammonium nitrate (HAN) solutions. The process utilizes a multi-compartment electrochemical membrane cell in which the HAN solution flows through a central ion exchanging compartment bounded by anion membranes on either side. Electrochemically generated OH-ions formed at the cathode are used to displace and remove the nitric acid from the HAN solution. In use, the residual nitric acid content in the HAN is suitably reduced to a specified safe level before the HAN is concentrated to a 13.0 molar final composition.
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