Abstract:
A process for the regeneration of loaded ion-exchange resin comprising (a) providing loaded resin for regeneration; (b) providing first stage and third stage regenerant suitable for regenerating loaded resin; (c) providing a plurality of regeneration vessels; (d) filling a regeneration vessel with a desired amount of the loaded resin before filling another regeneration vessel; (e) once a regeneration vessel has been filled, contacting the loaded resin within the vessel with first stage regenerant in a plug flow to provide a first stage regenerated resin; (f) contacting the first stage regenerated resin with third stage regenerant in a plug flow to provide regenerated resin and (g) removing and collecting third stage regenerant from a vessel containing regenerated resin and adding the collected regenerant to the first stage regenerant.
Abstract:
The present disclosure generally relates to methods, systems, and devices for electrically purifying liquids containing species such as minerals, salts, ions, organics, and the like. One aspect of the invention provides methods of regenerating media within an electrical purification device, for example, exposing the media to one or more eluting solutions, and/or selectively desorbing ions, organics, and/or other species from the media by exposing the media to certain eluting conditions. In yet another aspect, methods of selectively removing one or more ions, organics, and/or other species from a liquid to be purified are provided, e.g., by selective removal of one or more ions, or organics, and the like from solution that can easily precipitate, and/or cause scaling or fouling to occur. In still another aspect, the invention provides a method of treating a solution containing ions, organics, and/or other species using an electrical purification apparatus in a continuous or semi-continuous fashion, while also performing regeneration of media contained within the apparatus.
Abstract:
An apparatus and method for the treatment and purification of drinking water combines the use of ion-exchange resin and a membrane filter (12) in a single process tank (14). The ion-exchange resin is removed from the process tank (14) and regenerated in column (24) for reuse.
Abstract:
An ion exchanger (10) of the countercurrent type includes a pressure vessel (12) for supporting a resin bed (14). During a normal regeneration cycle, the vessel (12) exhibits both cocurrent and countercurrent operation.
Abstract:
A process is disclosed for washing sulfonated cation exchange resin beads to remove sulfuric acid therefrom, in which successive discrete amounts of aqueous sulfuric acid of decreasing concentration and finally a discrete amount of water are passed downwardly through a bed comprising sulfonated cation exchange resin beads and concentrated sulfuric acid. The amount of waste sulfuric acid from this process is eliminated or substantially reduced when compared to the known stirred-reactor, batch-type process which uses large amounts of sulfuric acid of decreasing concentration and finally a large amount of water.
Abstract:
Described herein are processes and apparatus for the high purity and high concentration recovery of multivalent products via continuous ion exchange from aqueous solutions for further down-stream purification.
Abstract:
An apparatus and method for reducing regenerant and wastewater by compressed air are provided. The method comprises the first service, the first air-intake and drain step, the first assistant drain step, the first rinse and backwash step, the second air-intake and drain step, and the first generation step. The first air-intake and drain step and the first assistant drain step are useful to reduce the total amount of the consumed pure water and total amount of the produced wastewater. By recovering and reusing the spent regenerant, the discarded amount of the spent regenerant is decreased, the concentration of the adsorbed substances in the spent regenerant is increased, thereby reducing the pollution in the environment.
Abstract:
Novel water softening products and methods of treating hard water are provided. The products comprise a salt and a metal chelating agent. The products are useful for regenerating ion exchange material in a water softening system and providing softened water containing both sodium and potassium ions, while having dramatically increased efficiencies over prior art products.
Abstract:
The disclosed invention is a fixed bed ion exchange water purification system. It employs a combination of electronically controlled process steps and specific systems configurations to duplicate the effects of moving resin beds from one operating position to another as is required in moving bed ion exchange water purification systems. The invention combines features of single fixed bed ion exchange systems with those of a moving bed system. The invention applies to the treatment of water having typical industrial and drinking water concentrations of various ions.
Abstract:
A quick, economical and environmentally friendly, “green”, process for the continuous purification of biodiesel (fatty acid alkyl esters (FAAE)) is described using a powdered, granulated or extruded adsorbent. The adsorbent is contained in a column system and is regenerated for reuse multiple times. The process employs an adsorbent such as, but not limited to, carbon, silica, clay, zeolite or a metal silicate contained in a column to remove the impurities from fatty acid alkyl esters (FAAE) or crude biodiesel in a continuous process. The process utilizes the adsorbent column system for the purification of biodiesel, rather than water or filtration, to remove soaps and other impurities entrained in a crude biodiesel. The crude biodiesel is contacted with an adsorbent packed into a column, or multiple columns in series, for a sufficient amount of time to remove impurities such as, but not limited to, soaps, metals, free glycerin, sterol glucosides and many of the other impurities that reduce the stability of biodiesel. The resulting finished biodiesel exiting the column(s) is ready for the methanol recovery process. Once the adsorbent no longer removes the desired amount of impurities, it is regenerated for reuse. The solvent used for the regeneration process is reclaimed and reused by recycling it back to the transesterification reaction.