Complex Formation of Straight‐Chain Polyols in Aqueous Solution with Incompletely Hydrated K+ and Ca2+ Cations on X and Y Zeolites
A systematic study was performed on the adsorption of alditole‐water mixture with a chain length of C3 to C6 on KX, KY and Ca(83)NaY zeolites. From the adsorption excess isotherms the separation factors and the equilibrium diagrams xs vs x1 of the binary mixtures were calculated. The possible triangles of 0 atoms of polyols and the influence of the conformation on formation of adsorption complexes are discussed.
Investigations of Adsorptive Separation of Glycerol/Propane‐1,3‐diol in Aqueous Solution on Zeolites by Liquid Phase Adsorption
The possibilities of adsorptive separation of propane‐1,3‐diol/water and glycerol/water mixtures on zeolitic adsorbents were studied in aqueous solution. The excess isotherms of both mixtures were determined on NaZSM‐5 and on K+ and Ca2+ modified X and Y zeolites. The equilibrium constants of the examined mixtures and the theoretical mixture propane‐1,3‐diol/glycerol were calculated. The interactions of the three O atoms of glycerol with Ca2+ ions on Y zeolites led to the highest separation factor glycerol/propane‐1,3‐diol. Propan‐1,3‐diol is separable by NaZSM‐5 zeolites.
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