Synthetic anion exchangers Dowex

Cholestyramine Resin. Colestyramin Dowex 1-X2-C1 VtK-135 Cholybar Co]ybar Cuemid Quantalan Questran. A synthetic, strongly besic anion exchange resin containing quaternary ammonium functional groups which are attached to a styrene-di vinyl benzene copolymer. Main constituent Polystyrene trimethylbenzylammonium as... 

The parfait-distillation method uses a sequential series of adsorbents to remove contaminants from water and vacuum distillation to recover unadsorbed materials. This method recovers a wide range of neutral, cationic, anionic, and hydrophobic contaminants. The first adsorbent, porous polytetrafluoroethylene (PTFE), removed humic acid and a broad range of hydrophobic compounds. PTFE was followed by Dowex MSC-1 and then Duolite A-162 ion-exchange resins. A synthetic hard water spiked parts-per-billion concentrations with 20 model compounds was used to evaluate the method. Poorly volatile, neutral, water-soluble species (glucose) cationic aromatics and most hydro-phobic compounds were recovered quantitatively. Model ampho-terics were removed from the influent but were not recovered from the adsorption beds. The recovery of model acids and bases ranged from 22% to 70% of the amount applied. 

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