Inert resin

As noted earlier, ion-exchange materials are grouped into four specific classifications depending on the functional group attached strong-acid cation, strong-base anion, weak-acid cation, or weak-base anion.. In addition to these, we also have inert resins that do not have chemical properties. 

There also exists a type of resin with no functional groups attached. This resin offers no capacity to the system but increases regeneration efficiency in mixed-bed exchangers. These inert resins are of a density between cation and anion resins and when present in... 

Trio-beds (triple beds) This is an MB double compartment design with an intermediate-density inert resin added to physically split the cation/anion resins during regeneration to minimize leakage. 

Powdered resins systems (80-600 mesh) typically operate at lower pressure drops, generate less waste water, take up less space, and cost much less when compared to deep-bed polishers. However, they operate at only 3 to 4 gpm sq ft (although the filter element area is large) and are designed to be disposable, so that the powdered resin must be replaced whenever the bed is reconditioned. Sometimes inert resins or cellulose-based fibers are used either in place of powdered resins or as a premix, where they function as both filter aids and absorbents. 

P. D. Ellis and B. W. Surles. Chemically inert resin coated proppant system for control of proppant flowback in hydraulically fractured wells. Patent US 5604184,1997. 

Inert resin in TPGDA 60.0 Base resin (elastomer)... 

Inert resin in aliphatic methane acrylate monomer 55.0 Tackifier... 

An alternative system was recently described by Chandross et al. (35,36) based on optically transparent aqueous-alkali-soluble methyl methacrylate-methacrylic acid copolymer as the inert resin. The dissolution inhibitor was an o-nitrobenzyl carboxylate which undergoes photochemical decomposition to o-nitrosobenzaldehyde plus a carboxylic acid as follows ... 

Figure 5-14. The Boc strategy for solid phase peptide synthesis. Synthesis proceeds from the C- to the N-terminus. Initially, one amino add (here alanine) protected on its amino group by a Boc group, is coupled to the inert resin using dicyclohexylcarbodiimide (DCCI). The Boc protecting group is cleaved off by treatment with acid. On neutralisation, the next amino acid...

Commercial inert resins for this application include Dowex Buffer Beads (XFS-43179), Ambersep 359 andDuolite S-3TR. 

Quantitation difficulties arising from differential molecular dynamics of soluble versus insoluble materials can be avoided by using an inert resin-bound moiety as an internal standard. The signal intensities of product to resin can be used to calculate the mole fraction of the product (x,) and resin (Xj). By knowing the molecular mass of the resin MW,), the loading capacity of the resin can be determined according to Eq. (1.10) ... 

Commence simultaneous acid and caustic regeneration 6% HCl solution up flow through the cation bed for 30 min and 4% NaOH solution at 43—49°C downflow through the anion bed for 60 min. The two streams flow out to waste-water neutralisation tank through the interface collector imbedded in the inert resin layer. 

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