A process for battery chemical production, where a sodium sulfate stream is treated with an ion exchange process to provide potassium sulfate and sodium chloride. The sodium chloride may be treated with a chlor-alkali to produce sodium hydroxide for use upstream in the battery chemical production process.

A process for battery chemical production, where a sodium sulfate stream is treated with an ion exchange process to provide potassium sulfate and sodium chloride. The sodium chloride may be treated with a chlor-alkali to produce sodium hydroxide for use upstream in the battery chemical production process.

A method of destroying a fluorocarbon compound includes regenerating an adsorbent to remove the fluorocarbon compound and to produce a regeneration fluid having a concentration of the fluorocarbon compound and directing the regeneration fluid to an electro-oxidation system. The method also includes applying a current to the electro-oxidation system to oxidize the fluorocarbon compound within the regeneration fluid and measuring a quantity of fluorides in the regeneration fluid to determine the progress of the removal of the fluorocarbon compound from the regeneration fluid.

A method of destroying a fluorocarbon compound includes regenerating an adsorbent to remove the fluorocarbon compound and to produce a regeneration fluid having a concentration of the fluorocarbon compound and directing the regeneration fluid to an electro-oxidation system. The method also includes applying a current to the electro-oxidation system to oxidize the fluorocarbon compound within the regeneration fluid and measuring a quantity of fluorides in the regeneration fluid to determine the progress of the removal of the fluorocarbon compound from the regeneration fluid.

In one aspect, separation media are described herein operable for removing one or more water contaminants including NOM and derivatives thereof. Briefly, a separation medium includes a nanoparticle support and an oligomeric stationary phase forming a film on individual nanoparticles of the support, the film having thickness of 1 to 100 nm. In some embodiments, oligomeric chains of the stationary phase are covalently bonded to the individual nanoparticles.

In one aspect, separation media are described herein operable for removing one or more water contaminants including NOM and derivatives thereof. Briefly, a separation medium includes a nanoparticle support and an oligomeric stationary phase forming a film on individual nanoparticles of the support, the film having thickness of 1 to 100 nm. In some embodiments, oligomeric chains of the stationary phase are covalently bonded to the individual nanoparticles.

The present invention relates to methods for purifying nucleic acids. In particular, the present invention relates to methods for purifying carbohydrate-conjugated oligonucleotides using a mixed-mode stationary phase and a mobile phase comprising a dual salt/organic solvent gradient. Methods for purifying carbohydrate-conjugated oligonucleotides using an anion exchange stationary phase and a mobile phase comprising a dual pH/salt gradient are also described.

The present invention relates to methods for purifying nucleic acids. In particular, the present invention relates to methods for purifying carbohydrate-conjugated oligonucleotides using a mixed-mode stationary phase and a mobile phase comprising a dual salt/organic solvent gradient. Methods for purifying carbohydrate-conjugated oligonucleotides using an anion exchange stationary phase and a mobile phase comprising a dual pH/salt gradient are also described.

A production system for removing impurities from a taurine mother liquor and recovering the taurine mother liquor. The system can be used in an ethylene oxide production process for taurine and the treatment of the last mother liquor of taurine. The system includes, consecutively, an anion resin adsorption device for adsorbing the anions of taurine and sodium isethionate, and an ammonia mixing and desalination device. A feed port of the anion resin adsorption device is operatively connected to receive the last mother liquor of taurine generated in the ethylene oxide taurine production process, and the anion resin adsorption device includes an anion exchange resin column. The ammonia mixing and desalination device includes an ammonia mixing reaction tank, a sealed filtering device, and a circulation path for returning filtrate to the ammonia mixing reaction tank.

A stack of ion exchange membranes suitable for water purification comprising a plurality of anion exchange membranes (AEMs) and a plurality of cation exchange membranes (CEMs), wherein the colour properties of the AEMs are visibly different to the colour properties of the CEMs. The invention also provides a process for making membrane stacks in which the likelihood of there being two consecutive membranes of like charge is reduced. Furthermore, it is easy to identify whether there are two consecutive membranes of like charge present in the stacks.