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Adsorption of Gases on Solids

Adsorption of Gases on Solids

Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...

Adsorption Isotherms I

Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed molecules.Consider the...

Adsorption Isotherms II

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...

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Optimize Flue Gas Settings to Promote Microalgae Growth in Photobioreactors via Computer Simulations

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Research on Oil and Gas Adsorption Optimization Based on CFD Modeling and Process Simulation.

Bin Liu¹, Mengjiao Zhang¹, Ye Tao¹

¹College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao 266042, P. R. China.

|July 15, 2024

Summary

This study optimizes oil and gas adsorption systems using computational fluid dynamics (CFD) and process simulation to reduce hydrocarbon emissions. Key parameters for pressure swing adsorption (PSA) were refined for efficient hazardous material treatment.

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Microfluidic Devices for Characterizing Pore-scale Event Processes in Porous Media for Oil Recovery Applications

Microfluidic Devices for Characterizing Pore-scale Event Processes in Porous Media for Oil Recovery Applications

Published on: January 16, 2018

Area of Science:

Chemical Engineering
Environmental Engineering
Process Engineering

Background:

Hydrocarbon evaporation during oil extraction and refining causes significant air pollution and safety risks.
Adsorption systems are crucial for treating volatile organic compounds (VOCs) and hazardous air pollutants.
Optimizing these systems is vital for environmental compliance and operational safety.

Purpose of the Study:

To comprehensively optimize key parameters in oil and gas adsorption systems.
To enhance the efficiency of hazardous material treatment using advanced modeling techniques.
To improve gas distribution and adsorption performance in industrial fixed bed adsorption towers.

Main Methods:

Established a computational fluid dynamics (CFD) model for hydrocarbon adsorption using a porous media model and user-defined functions (UDFs).
Simulated mass transfer in porous media to analyze gas distribution in industrial fixed bed adsorption towers.
Developed a cyclic two-tank adsorption model for pressure swing adsorption (PSA) process optimization.

Main Results:

Optimized equipment height-to-diameter ratio and intake distributor design to improve gas distribution and intensify the adsorption tank.
Identified optimal operating parameters for the PSA process, including adsorption time, pressure, temperature, feed flow rate, and purge ratio.
Successfully simulated hydrocarbon adsorption and mass transfer for efficient hazardous material treatment.

Conclusions:

CFD modeling and process simulation provide an effective approach for optimizing oil and gas adsorption systems.
System design modifications and optimized operating conditions significantly enhance adsorption efficiency and reduce emissions.
The study offers a pathway for more effective environmental management in the oil and gas industry.