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US 2026/0257932 A1Published application
Prussian-blue analogue (pba) ion-chromatography-based method for selective separation of rubidium from brine
AssigneeTechnion Research & Development Foundation Limited
InventorsOri LAHAV, Chen DAGAN JALDETY, Paz NATIV
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Abstract
The present invention relates to a process for separating rubidium ions from saline solutions rich in other monovalent ions, particularly sodium and potassium. The process relies on rubidium ions adsorption via ion exchange performed by metal-hexacyanoferrate particles. The process of the present invention provides pure rubidium salt with estimated production costs that do not exceed 20% of the current price.
Claims20
A process for the selective separation of rubidium ions from saline water, the process comprising the steps of:
- (a) passing saline water comprising rubidium ions and at least one of sodium ions and potassium ions through a first column comprising a plurality of metal-hexacyanoferrate particles which is pre-loaded with cations selected from Na+, H+, and a combination thereof,
- (b) passing a first eluent solution through the first column of step (a);
- (c) treating the permeate of step (b) to remove cations derived from the first eluent solution;
- (d) passing the treated permeate of step (c) through a second column comprising a plurality of metal-hexacyanoferrate particles pre-loaded with cations selected from NH4+, H+, and a combination thereof, and
- (e) passing a second eluent solution through the second column of step (d) thereby obtaining selective separation of rubidium ions from the saline water.
2 more elements
Dependencies are inferred from the claim text.