D-glyceric acid

one of the promising glycerol derivatives

has various biological functions such as accelerating ethanol and acetaldehyde oxidation. Plenty studies on the synthesis but few studies on downstream processes to recover D-glyceric acid were available. A static equilibrium adsorption was performed to study isothermal thermodynamics and kinetics of D-glyceric acid adsorption onto 201×7 strong basic anion exchange resin. The results showed that the adsorption process followed the Freundlich isothermal model at different pH and temperature conditions

which the maximum adsorption capacity decreased with increasing initial pH. The change of adsorption enthalpy was 14.77 kJ·mol-1 at 293-308 K

suggesting an endo-thermic adsorption process. Raising temperature improved adsorption rate with limited influence on equilibrium adsorption capacity. The Dynamic Boundary Model was used to investigate adsorption kinetics with a focus on effects of D-glyceric acid concentration

resin particle diameter and adsorption temperature. The results suggested the particle diffusion was rate-limiting step of the adsorption process. The adsorption rate increased with the increase of D-glyceric acid concentration and temperature

but decreased with the increase of resin particle diameter. The general kinetics equation was obtained with the rate constant of exchange (k0)

reaction order (a) and the apparent activation energy of reaction (Ea) as following k0=1.22×10-3

a=0.631

Ea=14.90 kJ·mol-1.