Adsorption of Cyclic Hydrocarbons on Silica Alumina Gels in Natural Gas Processing

et al. 2018

Ind. Eng. Chem. Res.

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To ensure the technical use of natural gas, heavy hydrocarbons and other components must be separated. Therefore, in this work the adsorption of C 6 −C 8 hydrocarbons n-hexane, n-heptane, n-octane, benzene, toluene, and cyclohexane on a commercial silica−alumina gel (Sorbead H) was investigated in experiments and dynamic simulations. Single and binary mixture equilibrium isotherms were determined from cumulative breakthrough curve experiments on a fixed bed adsorber at 25−75 °C and 1.3 bar (abs) in the trace range up to approximately 5000 ppm mol . The adsorption behavior is interpreted on the basis of the molecular structure of the adsorptive, the surface chemistry, and the pore structure of the adsorbents. Binary mixture isotherms were calculated using the theory of the ideal adsorbed solution (IAST). The results were in good agreement with experimental data. The adsorption dynamics was investigated by breakthrough curve experiments and simulated dynamically using an isothermal model based on mass balances and a linear driving force (LDF) model for adsorption kinetics.

Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Single and Binary Mixture Adsorption Behaviors of C₆–C₈ Hydrocarbons on Silica–Alumina Gel

Berg

Gohlke

et al. 2018

Ind. Eng. Chem. Res.

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“…In the group of hydrocarbons, aromatic, cyclic, and chained hydrocarbons should be distinguished. Although all hydrocarbons have no or almost no dipole moment, aromatic compounds such as benzene and toluene are able to interact electrostatically with polar surfaces by a quadrupole moment . In contrast, the chain‐like hydrocarbons are nonpolar so they mainly interact with the adsorbent surface by dispersion or induced electrostatic interactions.…”

Section: Methodsmentioning

confidence: 99%

Temperature Swing Adsorption in Natural Gas Processing: A Concise Overview

Berg

Eckardt³

et al. 2019

ChemBioEng Reviews

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To enable the technical use of natural gas, efficient gas processing is essential. Various components such as water, sulphur compounds, carbon dioxide, nitrogen, and heavy hydrocarbons must be removed. Temperature swing adsorption (TSA) is a commonly used way of removing some of these components. This paper describes where TSA is used in the natural gas treatment process and outlines the application of commercial adsorbents in TSA plants. The state of research on adsorbents and process control in TSA plants in natural gas processing is discussed.

“…For further information and data on BTCs of light hydrocarbons at low temperatures see Birkmann et al (2018) . With a mass balance around the adsorber, the adsorbed excess moles n ads [mol] can be calculated from the BTC . The equilibrium loading X eq [mol/kg] is obtained by normalization to the mass of adsorbent m a [kg] used.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…5 With a mass balance around the adsorber, the adsorbed excess moles n ads [mol] can be calculated from the BTC. 35 The equilibrium loading X eq [mol/kg] is obtained by normalization to the mass of adsorbent m a [kg] used. Equation 1 shows the mass balance.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Trace Adsorption of Light Hydrocarbons at Low Temperatures: Influence of Carrier Gas Coadsorption

Schmittmann

Luckas

et al. 2019

Ind. Eng. Chem. Res.

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During the adsorptive separation of light hydrocarbons in the trace range, significant coadsorption of the carrier gas may occur due to low temperatures and much higher concentrations of the carrier gas compared to the adsorptive. This results in a reduction of the adsorbent's capacity, which leads to problems in industrial adsorber design and an incorrect interpretation of adsorption mechanisms. So far, there are only few studies on the carrier gas influence, and no data exist for low temperatures. In this work, we present experimental adsorption isotherms of methane and ethane from nitrogen and helium at temperatures between −80 and +20 °C on activated carbon and zeolite 13X. A comparison of the adsorption isotherms and the isosteric adsorption enthalpy reveals that coadsorption increases strongly with low temperatures, low partial pressures, and weak interactions between adsorptive and adsorbent. Finally, coadsorption is shown to be stronger on activated carbon than on zeolite 13X.