Simple Procedure to Estimate Mass Transfer Coefficients from Uptake Curves on Activated Carbons

Abstract

A method based on the linear driving force (LDF) approximation is described to estimate the mass transfer coefficient of molecules adsorbing onto microporous carbons, by using independently measured uptake data. This parameter was determined from uptake curves derived from pressure increments during the measurement of isotherm data. To validate the method, simulations for batch uptake were performed and compared to the experimental data in order to obtain the values for the LDF constants. Such values were applied to predict breakthrough curves and compared to experimental data. The proposed method to estimate the LDF coefficient can be adequate to obtain a more physically meaningful value of the mass transfer coefficient.

Investigation and Improvement of Machine Learning Models Applied to the Optimization of Gas Adsorption Processes

“…To illustrate that in adsorption processes, we start by plotting Figure 7, which shows the experimental breakthrough curve of CO 2 and the simulated breakthrough curve according to the equilibrium nondispersive model as in Ruthven 29 (i.e., instantaneous adsorption and no axial dispersion) under the same operating conditions. The similarity regarded by the steepness of both curves suggests that mass transfer resistances are not significant, and the experimental tests by Magalhaẽs Siqueira et al 30 show that this is the case. Therefore, we can correlate the purity variable with the mean retention time parameter 29 or stoichiometric time, as defined in eq 8 alongside the other variables already in the model, P out , t pr , and t ads .…”

A numerical investigation of a fixed bed CO2 adsorption process using Phase Change Materials.

“…. Data of the case study 1 (SIQUEIRA et al, 2018) C adsorbate concentration in gas phase (mol m -3 ) ci yiC, gas phase concentration of species i (mol m -3 )…”

“…Case study 1. CO2 and N2 separation on activated carbon (MAGALHÃES SIQUEIRA et al, 2018) Siqueira et al, ( 2018) study CO2 capture in post-combustion adsorption. Table 1 shows the operational conditions, physical and transport properties of the proposed process.…”

“…To validate the model, experimental data was extracted from literature SIQUEIRA et al, 2018). The two case studies were for CO2 separation from a mixture of CO2/N2.…”