Effect of Agitation on Removal of Acetic Acid from Pretreated Hydrolysate by Activated Carbon

Abstract

The effect of agitation on the adsorption of acetic acid by activated carbon was tested utilizing an external mass transfer-diffusion model. Simulated pretreated biomass was contacted with activated carbon under prescribed conditions of temperature and agitation. Adsorption isotherm studies are presented as well as batch kinetic rate studies. Use of these data enabled the determination of isotherm constants, an external mass transfer coefficient, and an effective diffusivity for each agitation rate studied. The external film coefficient results ranged from 33.62 microm/s to a complete absence of external mass transfer resistance, and the diffusivity results ranged from 0.8625 to 10.70 microm(2)/s. The optimum combination of no external film resistance, and highest diffusivity, 10.70 microm(2)/s, occurred at 250 rpm and 25 degrees C. The results of these models and the experimental parameters suggested an efficacious method and conditions for the removal of this undesirable chemical.

The influence of different agitation techniques on the adsorption kinetics of 4-chlorophenol on granular activated carbon

“…In these studies, the particle size of the adsorbent before and after the experiment was not measured, but the effect of the particle size of the activated carbon on the adsorption kinetics of 4-CP is well documented [7,15]. The increase of the adsorption rate with the agitation speed was also described for the adsorption of the basic dye on the activated clay [6] as well as the acetic acid [5], imidacloprid [9] and 4-chlorophenol [7,15] on the activated carbon. The data presented in Table 1 also show that the agitation rate affects not only the adsorption kinetics but also the removal efficiency of 4-CP from the water.…”

“…A similar correlation was observed by Koumanova et al [7] who observed an increase in the adsorption capacity of 4-CP from 20.06 to 23.04 mg g -1 with an increasing agitation rate from 300 to 600 rpm. However, some authors have reported that the adsorption increases with increasing agitation speeds only up to a certain limit, beyond which there is no significant increase in the adsorption capacity [5,6,11]. In some cases, a decrease in the adsorption capacity at a higher agitation rate was observed [8,10].…”

“…The effect of the agitation on the adsorption is usually ignored. Only a few authors studied the effect of the agitation speed on the adsorption [5][6][7][8][9][10][11]. However, to our knowledge, the effect of the different mixing techniques on the adsorption has not so far been studied.…”

Renewable Chemicals: Production or Purification by Adsorption Process

“…Dynamic mass balance was obtained after running four or five cycles, and it could keep stable even after 20 cycles according to the regeneration results. Priddy and Hanley [50] also discussed the effect of agitation on the adsorption of acetic acid by activated carbon and suggested an efficacious method and conditions for the removal of this undesirable chemical.…”

The effect of the presence of metatartaric acid on removal effectiveness of heavy metal ions on chelating ion exchangers

“…It is a well-known natural acid that is widely distributed in almost all fruits and is particularly abundant in grapes. Tartaric acid, has a broad application area and is particularly used in the food, pharmaceutical (as an optical agent) and cosmetic, textile, colourings and printing sectors [1,2]. It was the first food acidulant used in significant quantities although its use has now been mostly replaced by citric acid.…”