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Modeling Of Carbon Dioxide and Nitrogen Removal From Natural Gas Using Membrane Processes

Che Wan Azmi, Che Wan Azwa Ibrahim (2005) Modeling Of Carbon Dioxide and Nitrogen Removal From Natural Gas Using Membrane Processes. Universiti Teknologi Petronas. (Unpublished)

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Abstract

Removal of carbon dioxide and nitrogen from natural gas is very critical processes. The carbon dioxide contributes to the corrosive problem to the pipeline and equipments when react with water while nitrogen needs to be reduced less than 4 % in order to meet the pipeline specifications. The objectives of this project are to develop a mathematical model for carbon dioxide and nitrogen removal from natural gas and to study the effects of PEBAX membrane pore size, mole fraction of gas speciesand operating pressure on permeability of gas species. Three factors including membrane pore size, mole fraction and operating pressure have been analyzed. The permeability models are developed by incorporating three main mechanisms that are viscous diffusion, Knudsen diffusion and surface diffusion. The modeling result shows the permeability of carbon dioxide was found to be highest followed by nitrogen and methane. At small pore size of 0.2 nm, the permeability of gases is dominated by surface diffusion while Knudsen diffusion overlook at large pore size of larger than 2 nm. Meanwhile the viscous flow is slightly increases with increasing pore size. The composition of mole fraction in the feed influenced the permeability of binary mixture. The permeability of CO2/CH4 mixture lay in between of pure carbon dioxide and pure methane permeability. Similarly the binary mixture of CO2/N2 and CH4/N2 lay in between the pure gases. For the tertiary mixture, the permeability of carbon dioxide and methane at fixed nitrogen concentration increases a bit compared to the binary mixture. At the mean time, increasing the operating pressure slightly increases the methane permeability whilst the permeability of carbon dioxide and nitrogen were found out almost independent. As the conclusion, the developed models were able to predict the permeability of pure carbon dioxide, methane, nitrogen and the mixtures of these gases.

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Advance Process Control
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 30 Sep 2013 16:55
Last Modified: 25 Jan 2017 09:46
URI: http://utpedia.utp.edu.my/id/eprint/7681

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