Welcome To UTPedia

We would like to introduce you, the new knowledge repository product called UTPedia. The UTP Electronic and Digital Intellectual Asset. It stores digitized version of thesis, dissertation, final year project reports and past year examination questions.

Browse content of UTPedia using Year, Subject, Department and Author and Search for required document using Searching facilities included in UTPedia. UTPedia with full text are accessible for all registered users, whereas only the physical information and metadata can be retrieved by public users. UTPedia collaborating and connecting peoples with university’s intellectual works from anywhere.

Disclaimer - Universiti Teknologi PETRONAS shall not be liable for any loss or damage caused by the usage of any information obtained from this web site.Best viewed using Mozilla Firefox 3 or IE 7 with resolution 1024 x 768.

Application of COSMO-RS in Gas Hydrate Mitigation

Liew, Chin Seng (2015) Application of COSMO-RS in Gas Hydrate Mitigation. IRC, Universiti Teknologi PETRONAS. (Unpublished)

[img] PDF
Download (1145Kb)

Abstract

Formation of gas hydrate in oil and gas pipelines has resulted in flow assurance problem. Ionic liquid (IL), due to its dual functionality has been considered as a very promising hydrate inhibitors. However, experimental testing of IL alone is insufficient to examine all potential ILs combinations due to high number of cation and anion to form ILs. Therefore, in order to screen potential ILs prior to narrow down the amount of potential ILs for experimental work, it is helpful to have a predictive model that could satisfactorily pre-screen ILs or to validate experimental work just by considering the fundamental properties. In this context, four fundamental properties of IL-hydrate system namely sigma profile, hydrogen bonding energies, activity coefficient, and solubility were stimulated through Conductor-Like Screening Model for Real Solvent (COSMO-RS). They were then analyzed to determine if they could be correlated with IL inhibition ability. Among them, sigma profile and hydrogen bonding energies, which later upgraded to total interaction energies exhibit significant relationship with IL inhibition ability. Sigma profile graph in general gives a qualitative understanding in whether certain IL is hydrophobic or hydrophilic. Total interaction energies of ions, on the other hand, have successfully been applied to develop a model that could predict IL thermodynamic inhibition ability in terms of average temperature depression. The correlation was validated with experimental values from literature with an average error of 20.49%. Findings also suggest that this correlation is not suitable to be used for substituted cations, due to the extra H-bonding provided by substituted functional group such as hydroxyl group. Finally, through the use of sigma profile graph and developed correlation, the inhibition ability of 20 ammonium based ILs have been predicted. TMA-OH, due to its short alkyl chain length cation and highly electronegative anion has shown the most promising inhibition ability among 20 of them. It is predicted to be able to depress temperature of IL-hydrate system by 1.97oC, whereas the widely studied EMIM-Cl can only experimentally depress the system by 1.22oC.

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Separation Process
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 5719 not found.
Date Deposited: 15 Apr 2016 10:31
Last Modified: 25 Jan 2017 09:35
URI: http://utpedia.utp.edu.my/id/eprint/16474

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...