Mass transfer mechanisms in fixed-bed adsorption of erythromycin

Abstract

The equilibrium and kinetic characteristics of the adsorption of erythromycin to Sepabeads SP825 were determined. The equilibrium data in a batch system was well described by a Langmuir isotherm. The separation performance was investigated in a fixed-bed system with respect to the adsorption superficial velocity, ionic strength and pH. A mathematical model was used to simulate the mass transfer mechanism, taking film mass transfer, pore diffusion and axial dispersion into account. The model predictions were consistent with the experimental data and were consequently used to determine the mass transfer coefficients.

13C NMR aided design of molecularly imprinted adsorbents for selectively preparative separation of erythromycin

“…The concentration of the free ERY in the supernatant was measured by a sulphuric acid chromogenic method. 36 The amount of ERY bound to the adsorbents was determined by subtracting the amount of free ERY from the amount of ERY initially added. The imprinting factor (IF) was calculated according to the following equation:…”

Recovery and separation of erythromycin from industrial wastewater by imprinted magnetic nanoparticles that exploit β‐cyclodextrin as the functional monomer

“…Finally, the substances adsorbed on the particles were eluted with 5.0 mL of methanol/acetic acid (9:1 v/v), and the recycled powder was obtained following vacuum drying. The total ERY concentration (including ERY‐A, ERY‐C, and ERY‐D) in the eluent was measured by the sulfuric acid chromogenic method . Meanwhile, the overall recovery of ERY was determined by comparing the amount of eluted ERY to the amount of initial ERY.…”

Enrichment and Purification of Bitespiramycin Using Macroporous Resin

“…As the original assumptions of the Langmuir isotherm were used in the derivation, each site for adsorption is equivalent in terms of adsorption energy, and there are no interactions between adjacent adsorbed molecules. Once all the adsorption sites are filled, no further adsorption can occur (Sun et al, 2008). The Langmuir model can be expressed by the following mathematical formula:…”