An Evaluation of Carbon Adsorption for Emissions Control and CFC-11 Recovery in Polyurethane Foam Processes

Knopeck, G. M.; Zwolinski, L.M.; Selznick, R.

doi:10.1177/0021955x8902500206

Cited by 2 publications

(1 citation statement)

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“…Future policies are likely to result in even more stringent emission requirements placing even more emphasis on recovery processes. One example of an application where adsorption-based systems are used to recycle CFC's is in foam production where R-ll is used as a blowing agent (Knopeck, 1989). There has been some work to characterize the adsorption equilibrium behavior of CFC's. Recently, R-113 adsorption on activated carbon and several other adsorbents was reported by Kodama et al (1992).…”

Section: Introductionmentioning

confidence: 99%

Measurement and correlation of the adsorption equilibria of refrigerant vapors on activated carbon

Mahle¹,

Buettner²,

Friday³

1994

Ind. Eng. Chem. Res.

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Adsorption equilibrium data have been measured for four refrigerant vapors (R-113, R-ll, R-318, and R-22) on BPL activated carbon at three temperatures over a wide range of partial pressures using an automated isotherm apparatus. Special emphasis is placed on the design and operation of the apparatus to ensure the quality of these data. Isotherm data for each refrigerant vapor are analyzed for correct Henry's law behavior and correlated using threeand four-parameter functions with specified temperature dependencies. The functions employed in this study include (1) the Langmuir equation, (2) the Dubinin-Astakhov equation, (3) the virial equation, and (4) the modified Antoine equation. The Dubinin-Astakhov equation provides the best (or very comparable) fits, based on the variance, for R-113, R-ll, and R-318. However, the Dubinin-Astakhov equation does not correctly describe the behavior of the R-22 data, resulting from its incorrect approach to Henry's law. Overall results show that, for adsorption of these refrigerants on BPL activated carbon, those correlations with exponents on the adsorbed-phase concentration terms greater than 1 generate the smallest variances.

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Section: Introductionmentioning

confidence: 99%