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

Abstract

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.

Fuel quality issues in stationary fuel cell systems.

“…Furthermore, water and CO 2 are strongly adsorbed on zeolites and, therefore, the gas to be treated needs to be free of moisture [20]. Data on adsorption of halogens on carbon only confirmed the results in our study that vinyl chloride and, in particular, low molecular weight halogens, such as chloromethane and chloroethane, are poorly adsorbed on many types of activated carbon [44,60,77,89,90].…”

“…The affinity coefficient (β) and the pore volume adjusting coefficient (k v ) are parameters that need to be estimated [64,65,67,69] or fitted to adsorption isotherm data. For the most part, we could find literature data for many of the species shown in Appendix 2 and fit equation (5) to those data [50,59,60,67,[69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84]. For the cases where data were not available (8 species), the parameters were correlated by using a reference species of similar properties and the method developed by Ye et al [67].…”

Effect of 13X Zeolite Modified with CuCl2 and ZnCl2 for Removing Phosphine from Circular Hydrogen of a Polysilicon Chemical Vapor Deposition Stove

“…Some other mathematical model studies ,, of instantaneous nonlinear adsorption coupled with finite zero-, first-, and second-order irreversible reaction were also reported by Loureiro et al They provided detailed descriptions of the influences of the mathematical model and operating parameters on the breakthrough time of adsorptive reactors. Moreover, Friday and co-workers also did many experimental researches about the adsorption equilibrium, predicting breakthrough of various challenge chemicals and axial dispersion of adsorption beds. In this paper, we discuss the PH 3 adsorption mechanisms of Cu-13X and Zn-13X with the methods of experiments and XRD characterizations.…”

Learning Semiparametric Regression with Missing Covariates Using Gaussian Process Models

“…First, we are going to apply our proposed method in Adsorption Isotherm data for R-113 refrigerant vapors on BPL activated carbon at 298 Kelvin obtained from Mahle et al (1994). BPL activated carbon is a virgin granular activated carbon designed for use in gas phase applications.…”

“…We partitioned the data into training and test datasets, containing 24 and 5 observations, respectively. Figure 1 displays the 24 training points as blue colors and the 5 test points as red colors from Adsorption Isotherm data in Mahle et al (1994).…”