Thermodynamics and kinetics of CO2 hydrate formation in the presence of cellulose nanocrystals
department or school: Applied Science, Faculty of
department or school: Chemical and Biological Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Cendales, Jairo Eduardo
issued: 2021-02-18T17:52:13Z
issued: 2021
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: The kinetics of gas hydrate formation are of interest in various energy and environmental applications of gas hydrates. One such example is the hydrate based gas separation (HBGS) as a possible method to capture CO₂ from either pre-combustion or post-combustion gas mixtures present in integrated gasification combined cycle (IGCC) and conventional power plants respectively. In such applications additives are included to improve the kinetics of gas hydrates. In this work, carbon dioxide hydrate was formed in aqueous suspensions of cellulose nanocrystals (CNC) and the induction time and rate of hydrate crystal growth was compared to data obtained with hydrates formed in pure water (blank). 24 runs were made for each group (blanks and CNCs). A suspension with a CNC concentration 0.75 wt% was employed to determine whether CNC could reduce the induction time and enhance hydrate growth rate as it has been reported for carbon nanotubes and other nanoparticle suspensions. Hydrate formation experiments were carried out in semi-batch mode setup in a high pressure crystallizer with overhead stirring. The temperature and the pressure were 274.15K and 2370 kPa respectively, this pressure is 1000 kPa above the equilibrium pressure of CO₂ hydrates at the mentioned temperature. Statistical analysis was performed with the data gathered to establish whether there is an effect of CNC nanoparticles in hydrate kinetics. The results show that the CNC did not have a statistically significant impact on CO₂ hydrate formation. This study also compared the results with data from the literature about the effect of other nanoparticles on gas hydrate formation.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/77336
note: THERMODYNAMICS AND KINETICS OF CO2 HYDRATE FORMATION IN THE PRESENCE OF CELLULOSE NANOCRYSTALS by Jairo Eduardo Cendales B.Sc., Universidad Nacional de Colombia (Bogotá), 2010 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Chemical and Biological Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) February 2021 © Jairo Eduardo Cendales, 2021 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, a thesis entitled: Thermodynamics and kinetics of co2 hydrate formation in the presence of cellulose nanocrystals submitted by Jairo Eduardo Cendales in partial fulfillment of the requirements for the degree of Master of Applied Science in Chemical and Biological Engineering Examining Committee: Dr. Peter Englezos, Professor, Chemical and Biological Engineering, UBC Supervisor Dr. Savvas G Hatzikiriakos, Professor, Chemical and Biological Engineering, UBC Supervisory Committee Member Dr. John A Ripmeester, Adjunct Faculty Member, Chemical and Biological Engineering, UBC Supervisory Committee Member Dr. Nagu Daraboina, Assistant Professor, Chemical Engineering, University of Tulsa Additional Examiner iii Abstract The kinetics of gas hydrate formation are of interest in various energy and environmental applications of gas hydrates. One such example is the hydrate based gas separation (HBGS) as a possible method to capture CO2 from either pre-combustion or post-combustion gas mixtures present in integrated gasification combined cycle (IGCC) and conventional power plants respectively. In such applications additives are included to improve the kinetics of gas hydrates. In this work, carbon dioxide hydrate was formed in aqueous suspensions of cellulose nanocrystals (CNC) and the induction time and rate of hydrate crystal growth was compared to data obtained with hydrates formed i…
has type: Thesis/Dissertation
date issued: 2021-05
is shown at: 10.14288/1.0395912
language: eng
degree discipline: Chemical and Biological Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/77336