The present invention relates to methods of regenerating ion exchange resins in systems using anhydrous organic solvents, such as systems for alkaliating or lithiating materials, such as anodes, in gamma-butyrolactone.

A system and method configured to restore ion exchange kinetic properties and purify resin is described. Degraded ion exchange kinetic properties of anion resin will eventually result in impurity slippage through resin charges. This system and method employs an acid catalyst in combination with sulfite cleaning solution to remove organic material and to protonate iron oxides for deconstruction and removal from anion resins. The cleaning solution, when applied via a cleaning vessel utilizing an eductor(s)/plenum and wedge-wire screen draw chamber, while controlling all phases of cleaning by electronic monitoring, yields complete restoration of ion exchange kinetics on usable resin. As such, the system and method provides a safe, effective, and vastly improved method for restoring anion resin kinetics and improving regeneration quality, for improved resin performance and minimizing resin replacement costs.

A water treatment method to generate potable water and a fertilization or fertigation product is provided. The method comprises the steps of: passing a raw water stream through an anion exchange resin (14a, 14b) to generate a potable water output; regenerating the anion exchange resin (14a, 14b) using a weak potassium chloride solution to generate a product output comprising potassium sulphate, potassium bicarbonate, and preferably also potassium nitrate, suitable for use as or as a precursor to a liquid fertilization or fertigation product.

A system for removing long-chain and short-chain per- and polyfluoroalkyl substances (PFAS) from contaminated water using a regenerable anion exchange resin includes at least one first anion exchange resin vessel configured to receive a flow of water contaminated with long and short-chain PFAS compounds. The at least one first anion exchange resin vessel includes a first regenerable anion exchange resin therein having a high affinity for long-chain PFAS compounds configured such that a majority of the long-chain PFAS compounds sorb to the first regenerable anion exchange resin to remove a majority of the long-chain PFAS compounds from the contaminated water and produce a flow of water having a majority of the long-chain PFAS compounds removed. The system also includes at least one second anion exchange resin vessel configured to receive the flow of water having a majority of the long-chain PFAS compounds removed. The at least one second anion exchange resin vessel includes a second regenerable anion exchange resin therein having a high affinity for short-chain PFAS compounds and is configured such that a majority of the short-chain PFAS compounds sorb to the second anion exchange resin to remove a majority of the short-chain PFAS compounds from the contaminated water and produce a treated flow of water having a majority of the long and short-chain PFAS compounds removed.

A system for removing long-chain and short-chain per- and polyfluoroalkyl substances (PFAS) from contaminated water using a regenerable anion exchange resin includes at least one first anion exchange resin vessel configured to receive a flow of water contaminated with long and short-chain PFAS compounds. The at least one first anion exchange resin vessel includes a first regenerable anion exchange resin therein having a high affinity for long-chain PFAS compounds configured such that a majority of the long-chain PFAS compounds sorb to the first regenerable anion exchange resin to remove a majority of the long-chain PFAS compounds from the contaminated water and produce a flow of water having a majority of the long-chain PFAS compounds removed. The system also includes at least one second anion exchange resin vessel configured to receive the flow of water having a majority of the long-chain PFAS compounds removed. The at least one second anion exchange resin vessel includes a second regenerable anion exchange resin therein having a high affinity for short-chain PFAS compounds and is configured such that a majority of the short-chain PFAS compounds sorb to the second anion exchange resin to remove a majority of the short-chain PFAS compounds from the contaminated water and produce a treated flow of water having a majority of the long and short-chain PFAS compounds removed.

A system for removing PFSAs and PFCAs from contaminated water using regenerable anion exchange resins includes at least one first anion exchange resin vessel which receives a flow of water contaminated with PFSAs and PFCAs. A first anion exchange resin vessel includes a first regenerable anion exchange resin therein which removes a majority of the PFSAs from the flow of water contaminated with PFSAs and PFCAs and produce a flow of water having a majority of the PFSAs removed. A second anion exchange resin vessel receives the flow of water having a majority of the PFSAs removed. The at least one second anion exchange resin vessel includes a second regenerable anion exchange resin therein which removes a majority of the PFCAs from the flow of water having a majority of PFSAs removed and produce a flow of treated water having a majority of the PFSAs and PFCAs removed.

A system for removing PFSAs and PFCAs from contaminated water using regenerable anion exchange resins includes at least one first anion exchange resin vessel which receives a flow of water contaminated with PFSAs and PFCAs. A first anion exchange resin vessel includes a first regenerable anion exchange resin therein which removes a majority of the PFSAs from the flow of water contaminated with PFSAs and PFCAs and produce a flow of water having a majority of the PFSAs removed. A second anion exchange resin vessel receives the flow of water having a majority of the PFSAs removed. The at least one second anion exchange resin vessel includes a second regenerable anion exchange resin therein which removes a majority of the PFCAs from the flow of water having a majority of PFSAs removed and produce a flow of treated water having a majority of the PFSAs and PFCAs removed.

The invention relates to a method for treating sugar comprising: placing a coloured sugar juice in contact with an ion exchange resin so as to charge the resin with colouring agents and to collect a bleached sugar juice; regenerating the colouring-charged resin, comprising: placing the charged resin in contact with a regeneration brine comprising a chloride salt; and collecting a regeneration effluent, the regeneration effluent comprising at least three fractions A, B and C, fraction A having a higher concentration of chloride salt than fractions B and C; and recycling the regeneration effluent, comprising: nanofiltration of fraction A of the regeneration effluent in order to obtain a first permeate and a first retentate; diafiltration of the first retentate, said diafiltration comprising: dilution of the first retentate with the fraction B of the regeneration effluent; nanofiltration of the mixture in order to obtain a second permeate and a second retentate; mixing of the first permeate with the second permeate and fraction C of the regeneration effluent,

The present disclosure relates to a process for reducing the amount of carbon disulphide (CS.sub.2) in a hydrocarbon feed containing C.sub.5-C.sub.8 fractions. The hydrocarbon feed is treated with an amine functionalized anion exchange resin (basic anion exchange resin) to obtain a mixture comprising a liquid fraction containing treated hydrocarbon and a solid mass containing an adduct of CS.sub.2 and the amine functionalized anion exchange resin. The so obtained liquid fraction containing the treated hydrocarbon is separated from the solid mass to obtain the hydrocarbon having CS.sub.2 content less than 2 ppm. The amine functionalized anion exchange resin can be regenerated from the solid mass.

Provided is a method of removing sodium from a collection of sodium-laden resin beads comprising the steps of (a) providing the collection of sodium-laden resin beads, wherein the resin beads comprise one or more vinyl polymers having quaternary ammonium groups; wherein cation exchange resin, if present in the collection of resin beads, are present in an amount of 0 to 0.5% by weight based on the weight of the collection of resin beads; wherein 90 mole % or more of the quaternary ammonium groups are each associated with a hydroxide anion; wherein sodium is present in an amount of more than 100 ppb by weight, based on the weight of the collection of sodium-laden resin beads, and (b) bringing the collection of sodium-laden resin beads into contact with aqueous ammonium hydroxide to form a mixture (b).