Process For Purifying Potassium Chloride
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United States of America Patent
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Aug 18, 2022
app pub date -
Jul 14, 2020
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Jul 15, 2019
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Abstract
A process for the preparation of purified potassium chloride comprises the at least partial removal of one or more class 1 heavy metal impurity (lead, arsenic, cadmium and/or mercury) from potassium chloride process liquor by an ion exchange step. The process uses an ion exchange resin and achieves high levels of purity and is compatible with high flow rates. A recrystallisation step (e.g. a cooling crystallization step) may be employed subsequent to the ion exchange step.
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