How to remove trace chloride ions from hot potassium alkali solutions
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Our plant uses natural gas as a raw material to produce synthetic ammonia, with the CO2 being removed through the thermal potassium alkali method. Recently, it was discovered that circulating water has leaked into the thermal potassium alkali solution, causing the chloride ion concentration in this solution to reach nearly 120 PPM. We are now seeking advice from colleagues to find methods for removing trace amounts of chloride ions from the thermal potassium alkali solution.
This seems a bit difficult. Try using the crystallization method to recover potassium carbonate, and gradually replace some of the remaining solution?
There’s no other way; a high evaporation concentration is required to produce the potassium carbonate and potassium chloride double salt. And that is under hydrogen-free potassium conditions.