A study on high-pressure adsorption and desorption of methane, ethane, propane and their mixtures on porous adsorbents

A study on high-pressure adsorption and desorption of methane, ethane, propane and their mixtures on porous adsorbents

This work investigates the high pressure adsorption and desorption of methane, ethane, propane and their mixtures on different types of adsorbents in both equilibrium and dynamic systems. A treatment based on thermodynamic concepts was considered to further study the equilibrium system. Meanwhile, a...

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Main Author: Ridha, Firas Noori
Format: Thesis
Language:English
Published: 2006
Subjects:
TP Chemical technology
Online Access:http://eprints.utm.my/id/eprint/1776/1/FirasNooriRidhaPKD2006.pdf
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spelling my-utm-ep.17762018-04-27T01:09:53Z A study on high-pressure adsorption and desorption of methane, ethane, propane and their mixtures on porous adsorbents 2006-01 Ridha, Firas Noori TP Chemical technology This work investigates the high pressure adsorption and desorption of methane, ethane, propane and their mixtures on different types of adsorbents in both equilibrium and dynamic systems. A treatment based on thermodynamic concepts was considered to further study the equilibrium system. Meanwhile, a thermodynamic modeling was performed to calculate the experimentally immeasurable adsorption quantities. The results demonstrated that activated carbons provide better adsorption capacities than molecular sieve zeolites and silica gel due to their highly developed porosities. Gas residual amount was observed to be related proportionally to gas molecular weights and bed temperature drop during desorption. Excess adsorption calculated for mixture on the basis of pure gases mole fractions was always higher than that obtained from the mixture within 10-30 % depending on adsorbent and gas mixture properties. This was found to be raised from the competition behavior between dissimilar species in the mixture. Methane maximum discharge rate of 5 L/min resulted in the most severe reduction in steady state delivery capacity, represented by a factor between 8.8-13.5 % compared to that delivered at 1 L/min. This was due to the extremely high temperature drop of –51.3 oC, a net drop of 78.3 oC, corresponding to an increase in drop range of about 40% compared to that at 1 L/min. Ethane and propane have potential impacts on all types of delivery capacities within a reduction factor between 19.4 to 37.1 % for discharge rate of 1 L/min. From the results of this work, it can be concluded that the presence of ethane and propane in the mixture substantially reduced the adsorption of methane. In addition, temperature drop in the dynamic system is unavoidable even when the chamber is discharged at the lowest possible rate, causing an increase in gas retention and consequently loss in storage delivery capacity. The introduction of the nonideality assumption into the conventional Kelvin equation has enhanced the applicability of the equation to describe the capillary condensation of subcritical gases at high pressures 2006-01 Thesis http://eprints.utm.my/id/eprint/1776/ http://eprints.utm.my/id/eprint/1776/1/FirasNooriRidhaPKD2006.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Chemical and Natural Resources Engineering Faculty of Chemical and Natural Resources Engineering
institution Universiti Teknologi Malaysia
collection UTM Institutional Repository
language English
topic TP Chemical technology
spellingShingle TP Chemical technology
Ridha, Firas Noori
A study on high-pressure adsorption and desorption of methane, ethane, propane and their mixtures on porous adsorbents
description This work investigates the high pressure adsorption and desorption of methane, ethane, propane and their mixtures on different types of adsorbents in both equilibrium and dynamic systems. A treatment based on thermodynamic concepts was considered to further study the equilibrium system. Meanwhile, a thermodynamic modeling was performed to calculate the experimentally immeasurable adsorption quantities. The results demonstrated that activated carbons provide better adsorption capacities than molecular sieve zeolites and silica gel due to their highly developed porosities. Gas residual amount was observed to be related proportionally to gas molecular weights and bed temperature drop during desorption. Excess adsorption calculated for mixture on the basis of pure gases mole fractions was always higher than that obtained from the mixture within 10-30 % depending on adsorbent and gas mixture properties. This was found to be raised from the competition behavior between dissimilar species in the mixture. Methane maximum discharge rate of 5 L/min resulted in the most severe reduction in steady state delivery capacity, represented by a factor between 8.8-13.5 % compared to that delivered at 1 L/min. This was due to the extremely high temperature drop of –51.3 oC, a net drop of 78.3 oC, corresponding to an increase in drop range of about 40% compared to that at 1 L/min. Ethane and propane have potential impacts on all types of delivery capacities within a reduction factor between 19.4 to 37.1 % for discharge rate of 1 L/min. From the results of this work, it can be concluded that the presence of ethane and propane in the mixture substantially reduced the adsorption of methane. In addition, temperature drop in the dynamic system is unavoidable even when the chamber is discharged at the lowest possible rate, causing an increase in gas retention and consequently loss in storage delivery capacity. The introduction of the nonideality assumption into the conventional Kelvin equation has enhanced the applicability of the equation to describe the capillary condensation of subcritical gases at high pressures
format Thesis
qualification_name Doctor of Philosophy (PhD.)
qualification_level Doctorate
author Ridha, Firas Noori
author_facet Ridha, Firas Noori
author_sort Ridha, Firas Noori
title A study on high-pressure adsorption and desorption of methane, ethane, propane and their mixtures on porous adsorbents
title_short A study on high-pressure adsorption and desorption of methane, ethane, propane and their mixtures on porous adsorbents
title_full A study on high-pressure adsorption and desorption of methane, ethane, propane and their mixtures on porous adsorbents
title_fullStr A study on high-pressure adsorption and desorption of methane, ethane, propane and their mixtures on porous adsorbents
title_full_unstemmed A study on high-pressure adsorption and desorption of methane, ethane, propane and their mixtures on porous adsorbents
title_sort study on high-pressure adsorption and desorption of methane, ethane, propane and their mixtures on porous adsorbents
granting_institution Universiti Teknologi Malaysia, Faculty of Chemical and Natural Resources Engineering
granting_department Faculty of Chemical and Natural Resources Engineering
publishDate 2006
url http://eprints.utm.my/id/eprint/1776/1/FirasNooriRidhaPKD2006.pdf
_version_ 1747814384006070272

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