the complexation constants increase with increasing number of -OH groups available for complexation. The 1:1 complexation constants for the solutes glycerol, fructose and sorbitol follow trends similar to complexation with B(OH) 4 - (aq.), more » i.e. All solutes complexed with NPB -, with all complexes containing only one NPB - per complex. Partition coefficients, distribution ratios and loadings are reported for varying concentrations of solute and NPB. Batch extraction experiments were performed at 25☌. Solutes investigated were 1,2-propanediol, glycerol, fructose, sorbitol and lactic acid. NPBA and Aliquat 336 (quaternary amine) is dissolved in 2-ethyl-l-hexanol, and the extractant is contacted with aq. The complexing extractant agent investigated in this work is 3-nitrophenylboronic acid (NPBA) in its anionic form (NPB).
However, capacity losses occur during acetone regeneration cycles, because acetone is more strongly held on the bed than is methanol. With methanol as the regenerant, fixed-bed adsorption and regeneration could be operated over several cycles with minimal loss of bed capacity. From batch equilibrium experiments, the affinity and capacity (25 C) of carbons for single and multiple 3 wt.%), lower volumetric flow rate (3-15 bed volumes/h), and uniform particle size or more » particle-size distribution. Several different experimental methods were used to understand better the mechanisms of adsorption of glycerol, glycols, and sugars from dilute aqueous solution onto activated carbons.
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