A process for the preparation of a carrier-free Ga-68 solution from an irradiated Zn target, systems comprising components used in the process, and compositions comprising Ga-68 prepared by the process. Purification of Ga-68 is carried out by feeding an irradiation target solution comprising Zn-68, Ga-68 and solid target assembly metals into a system comprising three chromatography columns in succession.

Provided is a method for producing lithium hydroxide, which can obtain lithium hydroxide from lithium sulfate with a relatively low cost. A method for producing lithium hydroxide from lithium sulfate includes: a hydroxylation step of allowing the lithium sulfate to react with barium hydroxide in a liquid to provide a lithium hydroxide solution; a barium removal step of removing barium ions in the lithium hydroxide solution using a cation exchange resin and/or a chelate resin; and a crystallization step of precipitating lithium hydroxide in the lithium hydroxide solution that has undergone the barium removal step.

The invention relates to compositions and methods of treatment employing compositions comprising polyelectrolyte complexes. The compositions include a water-soluble first polyelectrolyte bearing a net cationic charge or capable of developing a net cationic charge and a water-soluble second polyelectrolyte bearing a net anionic charge or capable of developing a net anionic charge. The total polyelectrolyte concentration of the first solution is at least 110 millimolar. The composition is free of coacervates, precipitates, latex particles, synthetic block copolymers, silicone copolymers, cross-linked poly(acrylic) and cross-linked water-soluble polyelectrolyte. The composition may be a concentrate, to be diluted prior to use to treat a surface.

The invention relates to compositions and methods of treatment employing compositions comprising polyelectrolyte complexes. The compositions include a water-soluble first polyelectrolyte bearing a net cationic charge or capable of developing a net cationic charge and a water-soluble second polyelectrolyte bearing a net anionic charge or capable of developing a net anionic charge. The total polyelectrolyte concentration of the first solution is at least 110 millimolar. The composition is free of coacervates, precipitates, latex particles, synthetic block copolymers, silicone copolymers, cross-linked poly(acrylic) and cross-linked water-soluble polyelectrolyte. The composition may be a concentrate, to be diluted prior to use to treat a surface.

The present disclosure describes a method of recovering uranium including a continuous ion exchange (CIX) process including a single cycle or a dual cycle CIX process and at least a gradient elution or resin crowding process. The present disclosure also describes an apparatus including a single cycle or dual cycle CIX system and a gradient elution and/or resin crowding system.

The invention relates to a process for preparing aminomethylated bead polymers using condensed formaldehydes and carboxylic anhydrides.

The invention relates to a process for preparing aminomethylated bead polymers using condensed formaldehydes and carboxylic anhydrides.

The invention relates to a process for preparing aminomethylated bead polymers from N-carboxymethylphthalimides, which are used as anion exchangers or can be converted further to chelate resins.

The invention relates to a process for preparing aminomethylated bead polymers from N-carboxymethylphthalimides, which are used as anion exchangers or can be converted further to chelate resins.

The invention relates to a method of producing monodisperse amidomethylated vinylaromatic bead polymers, to ion exchangers prepared from these monodisperse amidomethylated vinylaromatic bead polymers by alkaline hydrolysis, to the method of using said monodisperse amidomethylated vinylaromatic bead polymers in the manufacture of ion exchangers and chelating resins, and also to the method of using these ion exchangers in the removal of heavy metals and noble metals from aqueous solutions or gases.