Described herein is a material for reversibly binding to a carotenoid comprising a support coupled to silver ions in an amount to enable reversible binding with carotenoids, and wherein with the exception of silver ions, is substantially free of transition metals. Also described herein is a process for reversibly binding a carotenoid, the process comprising the steps of: providing a support coupled to silver ions in an amount to enable reversible binding with the carotenoid, wherein with the exception of silver, the support is substantially free of transition metals, contacting the support with the carotenoid under binding conditions to bind it thereto and dissociating the carotenoidod from the support under dissociating conditions to release the carotenoid.

Described herein is a material for reversibly binding to a carotenoid comprising a support coupled to silver ions in an amount to enable reversible binding with carotenoids, and wherein with the exception of silver ions, is substantially free of transition metals. Also described herein is a process for reversibly binding a carotenoid, the process comprising the steps of: providing a support coupled to silver ions in an amount to enable reversible binding with the carotenoid, wherein with the exception of silver, the support is substantially free of transition metals, contacting the support with the carotenoid under binding conditions to bind it thereto and dissociating the carotenoidod from the support under dissociating conditions to release the carotenoid.

The present invention relates to zirconium silicate compositions having a lead content that is below 0.6 ppm and methods of manufacturing zirconium silicate at reactor volumes exceeding 200-L with a lead content below 1.1 ppm. The lead content of the zirconium silicate of this invention are within the levels that are considered acceptable for extended use given the dose requirements for zirconium silicate.

An endoluminal prosthesis for placing in a body passage of a patient, includes a ureteral stent, the ureteral stent having a generally tubular housing having a proximal end and a distal end and a lumen longitudinally disposed therethrough, with cation-exchange resin beads disposed within the tubular housing, and at least one anchoring mechanism disposed on a distal end of the tubular housing, where at least one retention screen is disposed within the lumen of the ureteral stent configured to retain the plurality of beads.

An endoluminal prosthesis for placing in a body passage of a patient, includes a ureteral stent, the ureteral stent having a generally tubular housing having a proximal end and a distal end and a lumen longitudinally disposed therethrough, with cation-exchange resin beads disposed within the tubular housing, and at least one anchoring mechanism disposed on a distal end of the tubular housing, where at least one retention screen is disposed within the lumen of the ureteral stent configured to retain the plurality of beads.

In alternative embodiments, the invention provides processes and methods for the recovery or the removal of the so-called Minor Elements consisting of iron, aluminum and magnesium (expressed as oxides), from wet-process phosphoric acid using a continuous ion exchange approach. In alternative embodiments, use of processes and methods of the invention allows for the reduction of these Minor Elements with minimal phosphate losses and dilution in order to produce a phosphoric acid that is suitable for the production of fertilizer products such as world-class diammonium phosphate (DAP), merchant-grade phosphoric acid, superphosphoric acid, and other phosphoric acid products. Further, use of the invention would allow the use of lower grade phosphate rock or ore, which would greatly expand the potential phosphate rock reserve base for phosphate mining activities, and allow for better overall utilization of resources from a given developed mine site.

In alternative embodiments, the invention provides processes and methods for the recovery or the removal of the so-called Minor Elements consisting of iron, aluminum and magnesium (expressed as oxides), from wet-process phosphoric acid using a continuous ion exchange approach. In alternative embodiments, use of processes and methods of the invention allows for the reduction of these Minor Elements with minimal phosphate losses and dilution in order to produce a phosphoric acid that is suitable for the production of fertilizer products such as world-class diammonium phosphate (DAP), merchant-grade phosphoric acid, superphosphoric acid, and other phosphoric acid products. Further, use of the invention would allow the use of lower grade phosphate rock or ore, which would greatly expand the potential phosphate rock reserve base for phosphate mining activities, and allow for better overall utilization of resources from a given developed mine site.

An ion exchange system includes one or more strategies to reduce the amount of hydrogen gas inside an ion exchange column when the column is offline or disposed of. The ion exchange system comprises an ion exchange column including a housing and ion exchange media positioned in the housing. The ion exchange column can include one or more of the following: (1) an oxide material that limits the production of hydrogen gas from radiolysis, (2) a hydrogen scavenging material that removes or scavenges hydrogen gas inside the column, and (3) a hydrogen catalytic material that catalyzes the reaction of hydrogen and oxygen inside the column.

An ion exchange system includes one or more strategies to reduce the amount of hydrogen gas inside an ion exchange column when the column is offline or disposed of. The ion exchange system comprises an ion exchange column including a housing and ion exchange media positioned in the housing. The ion exchange column can include one or more of the following: (1) an oxide material that limits the production of hydrogen gas from radiolysis, (2) a hydrogen scavenging material that removes or scavenges hydrogen gas inside the column, and (3) a hydrogen catalytic material that catalyzes the reaction of hydrogen and oxygen inside the column.

A high-temperature-resistant and high-stability ion sieve and a preparation method and application thereof are provided. Based on a molar percentage of each oxide in the ion sieve, a composition of the ion sieve includes: SiO.sub.2: 46-60 mol %, Al.sub.2O.sub.3: 3-16 mol %, Y.sub.2O.sub.3: 0-3 mol %, and R.sub.2O: 33-45 mol %, where R.sub.2O is an alkali metal oxide; and the ion sieve satisfies: S.sub.Q.sub.3/S.sub.Q.sub.2 is not lower than 1.