Амберлит ЛА 2

Description

Amberlite LA 2 (Amberlite LA-2) is a liquid anion exchanger based on a secondary amine (N-lauryl-N-trialkylmethylamine), insoluble in water and soluble in non-polar organic diluents (kerosene, xylene, toluene). Unlike solid granular ion exchange resins of the same product line, LA-2 is used in the form of a solution in an organic solvent for liquid-liquid extraction - a process where an amine dissolved in the organic phase selectively binds anionic metal complexes from the aqueous acidic phase, ensuring their transfer and concentration. The mechanism of action is based on the protonation of the nitrogen atom of a secondary amine in an acidic environment to form an ammonium cation, which then forms an ion pair with an anionic metal complex (chloride, sulfate, salicylate, etc.), transferring it from the aqueous phase to the organic one. This approach belongs to the class of liquid ion exchange extraction and is comparable in selectivity to solid anion exchangers, but provides more flexible process control by varying the composition of the organic phase.

Basic Attributes

• CAS No.: 11128-96-4

Physico-chemical characteristics

• Density: 0.83 g/cm³

Scope of application

Liquid extraction and separation of metals in hydrometallurgy: extraction and purification of uranium and lead from mixed solutions by extraction of anionic salicylate and chloride complexes with high molecular weight amines dissolved in xylene or a similar diluent; separation of rare earth elements and tungsten, molybdenum and vanadium from acidic process solutions. Optimal extraction conditions are determined by selecting the pH of the aqueous phase, amine concentration, diluent composition, and phase contact time. The method is used as an alternative to solid-phase ion exchange where a continuous countercurrent process with large volumes of solution is required. Extraction cascades using amines such as Amberlite LA-2 were widely used in the industrial processing of uranium ores and process solutions from the nuclear industry in the mid-20th century, as well as in analytical chemistry for the selective separation of metals in sample preparation before instrumental analysis.

Storage and handling

Store in a tightly closed container, away from sources of open flame - working solutions of amine in organic diluents (kerosene, xylene) are flammable due to the low flash point of the diluent itself. Detailed data on the classification of gas chemicals and transport codes for commercial amine are not published in open sources. When working, use gloves and safety glasses, and provide exhaust ventilation due to organic solvent vapors. Regeneration of a saturated amine is carried out by washing with a carbonate or soda solution, which transfers the extracted metal complex back into the aqueous phase and returns the amine to its original form for a repeated extraction cycle without significant loss of extraction capacity when the cycle is repeated many times.