Recovery of ethanol from a molecular sieve by using dielectric heating

Burkholder, H.R.; Fanslow, G.E.; Bluhm, D.

doi:10.1021/i100023a019

Cited by 20 publications

(7 citation statements)

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Section: Resultsmentioning

confidence: 99%

“…According to this, E a for MMA polymerization in the MWF is different and significantly lower than E a under the conventional polymerization conditions. The power of the MWF per unit volume which is absorbed by reaction system under the influence of the MWF due to the dielectric losses is given in the following equation 17,18 : S a;a ¼ 55:63 Â 10 À12 fU 2 e 00 r (12) where f is the frequency (Hz), U is the local field intensity (V/m), and e 00 r is the imaginary part of dielectric constant.…”

Section: Resultsmentioning

confidence: 99%

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Comparison of the kinetics of conventional and microwave methyl methacrylate polymerization

Jovanović

Adnadjević

2007

J of Applied Polymer Sci

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A comparative investigation of the conventional and microwaves kinetics of methyl methacrylate (MMA) polymerization was performed. A method for determining the increase of the reaction rate in the microwave field (b) was presented. It was found that at all of the investigated temperatures and powers the polymerization rates increased in the presence of microwave energy by up to 8.9 times compared with conventional polymerization. Isothermal kinetics of the conventional MMA polymerization was investigated and its parameters were determined using isoconversion method. It was found that the calculated kinetics parameters changes complexly with degree of MMA conversion (a) and are in the mutual linear functional relationship, which is so called ''compensation effect.'' The complex changes of the kinetics parameters with a are explained with the postulated model for the mechanism of the MMA polymerization. The kinetics of the MMA polymerization under the microwave field (MWF) with different input power was investigated and its parameters were determined on the basis of the conversion-temperature curves and Arrhenius equation. The values of the kinetics parameters for MMA polymerization in the MWF are dependent on a and are from 1.2 to 12 times lower than that for conventional MMA polymerization. A new method for the determination of activation energy (E a ) of the investigated process in the MWF was described. Decreased E a value of the polymerization process in the MWF compared with the conventional polymerization is explained with the formation of the nonequilibrium energetic distribution of the reactants due to the rapid transfer of energy in the reaction system.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Comparison of the kinetics of conventional and microwave methyl methacrylate polymerization

Jovanović

Adnadjević

2007

J of Applied Polymer Sci

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“…Burkholder et al 1 found that applying microwave energy enhances the desorption of ethanol from silicalite because it selectively heats the ethanol without heating the adsorbent. Furthermore, the researchers recognized the possibility for using MW regeneration to facilitate solvent recovery.…”

Section: Discussionmentioning

confidence: 99%

VOC Recovery through Microwave Regeneration of Adsorbents: Process Design Studies

Price¹,

Schmidt²

1998

Journal of the Air & Waste Management Association

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Process design studies are described for a new type of VOC recovery system which uses microwave heating to regenerate adsorbents. Microwave regeneration systems create a highly concentrated effluent from which the VOCs can be recovered by condensation at near-ambient temperatures. Important design considerations, predicated on experimental work and model development, are identified and discussed. Parametric studies are then described that identify the optimal adsorbent selection, operating cycle, recovery configuration, regeneration pressure, regeneration final coverage, and column configuration. In general, it was found that microwave regenerated adsorption systems favor the use of low dielectric loss-factor polymeric adsorbents and operation under low pressure conditions (about 5 torr absolute pressure).

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“…Previous studies showed that regeneration conditions and heating method can impact heel build-up on activated carbon. , Conductive heating, hot gas purging, and steam heating are typically used to regenerate adsorbents. Drawbacks associated with these techniques include long duration, high energy consumption due to heat loss (to surrounding equipment, adsorbent, and concentrated VOC gas stream), and potential changes to the adsorbent’s physical and chemical properties. − …”

Section: Introductionmentioning

confidence: 99%

Using Microwave Heating To Improve the Desorption Efficiency of High Molecular Weight VOC from Beaded Activated Carbon

Fayaz

Shariaty

Atkinson

et al. 2015

Environ. Sci. Technol.

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Incomplete regeneration of activated carbon loaded with organic compounds results in heel build-up that reduces the useful life of the adsorbent. In this study, microwave heating was tested as a regeneration method for beaded activated carbon (BAC) loaded with n-dodecane, a high molecular weight volatile organic compound. Energy consumption and desorption efficiency for microwave-heating regeneration were compared with conductive-heating regeneration. The minimum energy needed to completely regenerate the adsorbent (100% desorption efficiency) using microwave regeneration was 6% of that needed with conductive heating regeneration, owing to more rapid heating rates and lower heat loss. Analyses of adsorbent pore size distribution and surface chemistry confirmed that neither heating method altered the physical/chemical properties of the BAC. Additionally, gas chromatography (with flame ionization detector) confirmed that neither regeneration method detectably altered the adsorbate composition during desorption. By demonstrating improvements in energy consumption and desorption efficiency and showing stable adsorbate and adsorbent properties, this paper suggests that microwave heating is an attractive method for activated carbon regeneration particularly when high-affinity VOC adsorbates are present.

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Recovery of ethanol from a molecular sieve by using dielectric heating

Cited by 20 publications

References 0 publications

Comparison of the kinetics of conventional and microwave methyl methacrylate polymerization

Comparison of the kinetics of conventional and microwave methyl methacrylate polymerization

VOC Recovery through Microwave Regeneration of Adsorbents: Process Design Studies

Using Microwave Heating To Improve the Desorption Efficiency of High Molecular Weight VOC from Beaded Activated Carbon

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