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Efficient and Cost Effective Way for the Conversion of Potassium Nitrate from Potassium Chloride Using Electrodialysis
journal contribution
posted on 2016-04-12, 00:00 authored by Prem P. Sharma, Swati Gahlot, Abhishek Rajput, Rajesh Patidar, Vaibhav KulshresthaA metathesis electrodialysis (MED)
system for the conversion of
potassium nitrate from potassium chloride is developed. The experiments
are carried out in recirculation mode using a four compartment electro-conversion
unit of 200 cm2 effective membrane area with 10 cell pairs.
The cation exchange membrane and anion exchange membrane used for
the present study are converted from a styrene divinylbenzene based
interpolymer film by sulfonation and chloromethylation followed by
amination, respectively. Membranes are characterized by means of chemical,
mechanical, and thermal properties. Membranes show excellent electrochemical
properties with adequate thermal and mechanical stability. About 97%
conversion of potassium nitrate is achieved during the sets of experiments
with high product purity (99%). Four different applied potentials
(1.5, 2, 2.5, and 3 V/cell pair) are used during different sets of
experiments in metathesis electrodialysis, out of which 2 V/cell pair
is found to be more efficient potential with lower energy consumption
of 0.82 kwh·kg–1 for the production of potassium
nitrate with 83% current efficiency.