Monovalent anion selective membrane enabled by high concentration brine
AssigneeEnergy Exploration Technologies, Inc.
InventorsGeorge Y. GU, Amit PATWARDHAN, Guanyu MA, Michael Z. HU, Teague M. EGAN
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Abstract
The present disclosure provides methods of improving the monovalent selectivity of the anion exchange membrane. When operating electrodialysis in a high salinity brine, the high salinity solution enables monovalent selective transport. The monovalent selectivity can significantly retard divalent anion transport, such as SO42—, and is particularly useful during lithium extractions from brines. Such selectivity can be utilized in many operation containing high concentration of salt solution such as sea salt extraction, lithium production, and the production of chloroalkanes.
Claims34
A method of separating a monovalent anion from a multivalent anion from a solution comprising contacting the solution with an electric current causing the current to pass through a membrane component, wherein the membrane component comprises one or more membranes, wherein the solution comprises a total dissolved salt (TDS) amount of at least 5%.
The method of claim 11, wherein the amine groups comprise an amine of the formula:
- —NR′R″R′″, wherein R′, R″, and R′″ are a C1-C30 aliphatic groups.
A method of separating a monovalent anion from a multivalent anion from a lithium brine solution comprising contacting the lithium brine solution with an electric current causing the current to pass through a membrane component, wherein the membrane component comprises one or more membranes, wherein the lithium brine solution comprises a total dissolved salt (TDS) amount of at least 5%.
A method of separating a monovalent anion from a multivalent anion from a sea water solution comprising contacting the sea water solution with an electric current causing the current to pass through a membrane component, wherein the membrane component comprises one or more membranes, wherein the sea water solution comprises a total dissolved salt (TDS) amount of at least 5%.
A method of separating a monovalent anion from a multivalent anion from a chloroalkane production solution comprising contacting the chloroalkane production solution with an electric current causing the current to pass through a membrane component, wherein the membrane component comprises one or more membranes, wherein the chloroalkane production solution comprises a total dissolved salt (TDS) amount of at least 5%.
Dependencies are inferred from the claim text.