Desorption of ethyl acetate from activated carbon by supercritical carbon dioxide

Tan, Chung‐Sung; Liou, Din Chung

doi:10.1021/ie00078a017

Cited by 128 publications

(87 citation statements)

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“…Above that flow, the process was no longer limited by solubility but mass transfer limited. This effect of SCCO 2 flow agreed with that reported by other authors [14,15,22].…”

Section: Mass Transfer Limitations: Effect Of Time Flow and Pressuresupporting

confidence: 93%

“…Some authors affirm that density is the controlling parameter at pressures just above the critical pressure, and regeneration gets worse with increasing temperatures [7,14,15]. It is also stated that as the fluid is compressed, viscosity becomes progressively more influential and the negative effect of temperature is then mitigated [7,9,14,15].…”

Section: Effect Of Temperaturementioning

confidence: 99%

“…Furthermore, the extracted adsorbate can be easily recovered to be reused or destroyed once the SCCO 2 is cooled and depressurized to atmospheric pressure. SCCO 2 is usually employed to regenerate ACs saturated with volatile organic compounds like benzene [7], toluene [8][9][10][11], m-xylene [12], cyclohexane [13], or ethyl acetate [14,15]. The regeneration of ACs saturated with inorganic compounds is less usual and co-solvents must be used to efficiently extract these adsorbates [16].…”

Section: Introductionmentioning

confidence: 99%

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Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol

et al. 2018

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Featured Application: Authors are encouraged to provide a concise description of the specific application or a potential application of the work. This section is not mandatory. Abstract:The properties of supercritical CO 2 (SCCO 2 ) and supercritical water (SCW) turn them into fluids with a great ability to remove organic adsorbates retained on solids. These properties were used herein to regenerate an activated carbon fiber (ACF) saturated with a pollutant usually contained in wastewater and drinking water, phenol. Severe regeneration conditions, up to 225 bar and 400 • C, had to be employed in SCCO 2 regeneration to break the strong interaction established between phenol and the ACF. Under suitable conditions (regeneration temperature, time, and pressure, and flow of SCCO 2 ) the adsorption capacity of the exhausted ACF was completely recovered, and even slightly increased. Most of the retained phenol was removed by thermal desorption, but the extra percentage removed by extraction allowed SCCO 2 regeneration to be significantly more efficient than the classical thermal regeneration methods. SCCO 2 regeneration and SCW regeneration were also compared for the first time. The use of SCW slightly improved regeneration, although SCW pressure was thrice SCCO 2 pressure. The pathways that controlled SCW regeneration were also investigated.

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“…Above that flow, the process was no longer limited by solubility but mass transfer limited. This effect of SCCO 2 flow agreed with that reported by other authors [14,15,22].…”

Section: Mass Transfer Limitations: Effect Of Time Flow and Pressuresupporting

confidence: 93%

Section: Effect Of Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol

et al. 2018

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“…The applications of this technology in different areas have been reviewed in detail by a number of researchers (Jessop, 1999;Marr & Gamse, 2000). One of these applications is to regenerate adsorbents (Picht et al, 1982;Tan & Liou, 1988). A study of the regeneration of the sodium form of some carboxylic cation exchange resins using pressurized CO 2 aqueous solutions was carried out and demonstrates that the regeneration efficiency of carbonic acid depends upon the acidity of the resin.…”

Section: Introductionmentioning

confidence: 99%

Desorption of heavy metals from ion exchange resin with water and carbon dioxide

Silva

Brunner

2006

Braz. J. Chem. Eng.

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-Adsorption and regeneration of ion exchange resins were studied using a subcritical solution of a CO 2 -H 2 O mixture and a fixed bed column. The commercial Amberlite IRC-50/IRC-86 cation exchange resins and Amberlite IRA-67 anion exchange resin were tested for heavy metals (Pb, Cu, Cd) adsorption from a solution with different initial metal concentrations at different temperatures. After adsorption, the loaded resins were regenerated with water and carbon dioxide at different temperatures and a pressure of 25 MPa. The efficiency of the IRC-50 resin was lower than that of the IRC-86 resin for the adsorption of metals like Cd, Cu and Pb. Results obtained for desorption of these metals indicated that the process could be used for Cd and in principle for Cu. Sorption of metal ions depended strongly on feed concentration. Mathematical modeling of the metal desorption process was carried out successfully as an extraction process. For this purpose, the VTII Model, which is applied to extraction from solids using supercritical solvents, was used in this work.

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“…However, their reports made no comparison with normal liquids concerning uptake and adsorption rate. There are, also, numerous studies on the adsorption and desorption of organic molecules in SCFs into/from activated carbon, clay, and porous silica (26)(27)(28)(29)(30)(31)(32)(33)(34). Most studies focused on desorption for supercritical drying and extraction, which are the most successful processes utilizing SCFs, rather than on incorporation of functional molecules into porous materials.…”

Section: Introductionmentioning

confidence: 99%