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Removal of C02 from Natural gas stream using Silica Membrane

In this study the synthesis, characterization, and gas transport properties of silica membranes supported on porous alumina substrate in separating or removing carbon dioxide (C02) from natural gas stream (CRt) were studied. Silica membranes are prepared by dip-coating a prepared porous alumina s...

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Main Author: Hussein, Nas Aaryu
Format: Final Year Project
Language:English
Published: Universiti Teknologi PETRONAS 2009
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TP Chemical technology
Online Access:http://utpedia.utp.edu.my/9118/1/2009%20-%20Removal%20of%20Carbon%20Dioxide%20from%20Natural%20Gas%20Stream%20By%20Using%20Silica%20Membrane.pdf
http://utpedia.utp.edu.my/9118/
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spelling my-utp-utpedia.91182013-10-22T09:36:41Z http://utpedia.utp.edu.my/9118/ Removal of C02 from Natural gas stream using Silica Membrane Hussein, Nas Aaryu TP Chemical technology In this study the synthesis, characterization, and gas transport properties of silica membranes supported on porous alumina substrate in separating or removing carbon dioxide (C02) from natural gas stream (CRt) were studied. Silica membranes are prepared by dip-coating a prepared porous alumina support in a polymeric silica sol made by base-catalyzed hydrolysis and condensation of tetraethyl orthosilicate (TEOS), Si(OCHzCH3)4, in ethanol. The membranes were characterized using Scanning Electron Microscopy and the single gas permeation test. From the SEM observation, silica membrane was tightly attached to the substrate and the average thickness of the membrane was approximately 15-16 Jl!Il. The effect of dipping time during dip-coating of the porous alumina support also been studied. Longer dipping time may improve the selectivity. Total of three samples have been produced with the same silica sol gel but at different dipping time which are at 1, 2 and 3 hour. The silica membranes with 3 hour of dipping time displayed high C02 permeance (3.35963xl0~ mollm2.s.Pa) but small selectivity of 1.398 towards COz.The gas permeation test is conducted at room temperature and with different feed pressure of 1.5, 2.0, 2.5 and 3.0 bar. All synthesized silica membrane, show high permeance of C02 (COzpermeance > CRt permeance) thus give the evidence that the mechanism of molecular differentiation by silica layer is through size selectivity. However, the selectivity of these membranes is smaller compared to idea Knudsen separation factor of 1.66. This small deviation from ideal Knudsen diffusion may be due to a minute number of microcracks in the membrane layer, which were not observable by SEM, but detected by this test. (Small defects and cracks often appear in thin films during the calcinations process ).However, the selectivity of the synthesized silica membrane can be improved through some modification which is by applying multiple separation layer of silica sol on the top membrane. The formation of several separation layers will gradually decreased the pore size of the membrane leading to greater selectivity of separation gas especially C02 and CRt separation. 1 Universiti Teknologi PETRONAS 2009-01 Final Year Project NonPeerReviewed application/pdf en http://utpedia.utp.edu.my/9118/1/2009%20-%20Removal%20of%20Carbon%20Dioxide%20from%20Natural%20Gas%20Stream%20By%20Using%20Silica%20Membrane.pdf Hussein, Nas Aaryu (2009) Removal of C02 from Natural gas stream using Silica Membrane. Universiti Teknologi PETRONAS. (Unpublished)
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Electronic and Digitized Intellectual Asset
url_provider http://utpedia.utp.edu.my/
language English
topic TP Chemical technology
spellingShingle TP Chemical technology
Hussein, Nas Aaryu
Removal of C02 from Natural gas stream using Silica Membrane
description In this study the synthesis, characterization, and gas transport properties of silica membranes supported on porous alumina substrate in separating or removing carbon dioxide (C02) from natural gas stream (CRt) were studied. Silica membranes are prepared by dip-coating a prepared porous alumina support in a polymeric silica sol made by base-catalyzed hydrolysis and condensation of tetraethyl orthosilicate (TEOS), Si(OCHzCH3)4, in ethanol. The membranes were characterized using Scanning Electron Microscopy and the single gas permeation test. From the SEM observation, silica membrane was tightly attached to the substrate and the average thickness of the membrane was approximately 15-16 Jl!Il. The effect of dipping time during dip-coating of the porous alumina support also been studied. Longer dipping time may improve the selectivity. Total of three samples have been produced with the same silica sol gel but at different dipping time which are at 1, 2 and 3 hour. The silica membranes with 3 hour of dipping time displayed high C02 permeance (3.35963xl0~ mollm2.s.Pa) but small selectivity of 1.398 towards COz.The gas permeation test is conducted at room temperature and with different feed pressure of 1.5, 2.0, 2.5 and 3.0 bar. All synthesized silica membrane, show high permeance of C02 (COzpermeance > CRt permeance) thus give the evidence that the mechanism of molecular differentiation by silica layer is through size selectivity. However, the selectivity of these membranes is smaller compared to idea Knudsen separation factor of 1.66. This small deviation from ideal Knudsen diffusion may be due to a minute number of microcracks in the membrane layer, which were not observable by SEM, but detected by this test. (Small defects and cracks often appear in thin films during the calcinations process ).However, the selectivity of the synthesized silica membrane can be improved through some modification which is by applying multiple separation layer of silica sol on the top membrane. The formation of several separation layers will gradually decreased the pore size of the membrane leading to greater selectivity of separation gas especially C02 and CRt separation. 1
format Final Year Project
author Hussein, Nas Aaryu
author_facet Hussein, Nas Aaryu
author_sort Hussein, Nas Aaryu
title Removal of C02 from Natural gas stream using Silica Membrane
title_short Removal of C02 from Natural gas stream using Silica Membrane
title_full Removal of C02 from Natural gas stream using Silica Membrane
title_fullStr Removal of C02 from Natural gas stream using Silica Membrane
title_full_unstemmed Removal of C02 from Natural gas stream using Silica Membrane
title_sort removal of c02 from natural gas stream using silica membrane
publisher Universiti Teknologi PETRONAS
publishDate 2009
url http://utpedia.utp.edu.my/9118/1/2009%20-%20Removal%20of%20Carbon%20Dioxide%20from%20Natural%20Gas%20Stream%20By%20Using%20Silica%20Membrane.pdf
http://utpedia.utp.edu.my/9118/
_version_ 1739831633158078464
score 13.211869

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