A review of models developed to predict gaseous phase activated carbon adsorption of organic compounds

Micropore characterization of activated carbons of respirator cartridges with argon, carbon dioxide, and organic vapors of different vapor pressures

“…Nelson et al have shown that RH values between 0% and 50% had no significant effect on the breakthrough time for 121 organic vapors, whereas above 60% RH, the dependence of the humidity became quite significant and was more important at lower concentrations [40]. These results are in agreement with another study that showed that water adsorption isotherm on activated carbon had increased sharply at about 50% RH [41]. But, contradicting results have been reported by Werner [42] who observed marked effect on breakthrough times below Table 3 Comparison of liquid adsorption capacities and ratio of the micropore volume occupied by an organic vapor at 24 L/min, 294 K, $ 500 ppm, and 40% RH per adsorbate-adsorbent systems.…”

“…The experimental pore volume values derived from the OV adsorption isotherm with different boiling points at the same concentration using the DR equation were within 0-19% for W OV-DRexp and 2-23% for W OV-DRcalc from the micropore volume derived from the Ar data. Thus reiterating the importance of having a specific structural constant which takes accounts the differences in the micropore structure [41]. With the exception of MSA Comfo, which has the widest pore size distribution and the largest specific surface area, in general, the micropore volume values obtained with OV adsorption isotherm were greater than those of Ar, especially for W OV-DRcalc .…”

“…For example, MIBK shows the greatest discrepancies (0.74-1.03 cm 3 OV/cm 3 Ar) and has the highest kinetic diameter of 7.35 Å (see Table 2) compared with DCM (0.13-0.18 cm 3 OV/cm 3 Ar), which has a small kinetic diameter of 3.3 Å comparable to that of CO 2 and Argon. Thus size exclusion effect is less pronounced for smaller molecules and may play a role in the adsorption of larger molecules for microporous activated carbon [41]. Moreover, the pore size distribution is another important contributor to the adsorption of OV onto activated carbon.…”

A Qualitative Analysis of the Effects of Water Vapor on Multi-Component Vapor-Phase Carbon Adsorption

“…35 The extent to which relative humidity affects the vapor phase adsorption process depends on the type of adsorbates, their partial pressures and the level of relative humidity. 6 Information related to the effect of water vapor on multicomponent vapor adsorption has been reported by Grant. 7 The wet adsorbate and wet adsorbent tests (RH = 80 percent) for two ternary mixtures of paraffins, aromatics and halocarbons were conducted in their study.…”

Systematic evaluation of the adsorption of organic vapors onto a miniaturized cartridge device using breakthrough tests in parallel experiment with a full size respirator cartridge

“…The flow rate of 24 l/ min through the OV cartridge was chosen as the equivalent breathing rate for moderate work. The breakthrough tests were performed at 40% RH and the adsorption of water vapor at this RH is considered insignificant Werner et al, 1986). A concentration of 500 ppm was chosen as a reasonable amount to achieve 100% saturation in a controllable time manner for all the tested vapors.…”