%0 Journal Article
%@ 08885885
%A Rehman, A.N.
%A Bavoh, C.B.
%A Lal, B.
%A Sabil, K.M.
%A Sangwai, J.S.
%D 2022
%F scholars:16361
%I American Chemical Society
%J Industrial and Engineering Chemistry Research
%K Additives; Dissociation; Gas hydrates; Hydration; Kinetics; Sodium chloride; Sodium dodecyl sulfate; Sulfur compounds; Waterworks, Acid systems; Amino-acids; Dissociation kinetics; Formation kinetics; Hydrate dissociation; Hydrate formation; L-isoleucine; L-methionine; Pure water; Sodium dodecyl sulphate, Amino acids
%N 37
%P 13863-13876
%R 10.1021/acs.iecr.2c02178
%T Insights on CO2Hydrate Formation and Dissociation Kinetics of Amino Acids in a Brine Solution
%U https://khub.utp.edu.my/scholars/16361/
%V 61
%X CO2sequestration as hydrates has captured enormous research interest in recent years due to its high storage capacity. However, the slow hydrate formation kinetics poses a strong challenge in its applicability and urges the need for additives (kinetic promoters) to accelerate the hydrate formation kinetics. This study investigates the performance of amino acid solutions in brine (3.3 wt  NaCl) on CO2hydrate formation and dissociation kinetics. The kinetics of hydrate formation and dissociation was evaluated at varying concentrations (0.2, 0.5, 0.8, and 1 wt ) of l-methionine, l-isoleucine, and l-threonine solutions in brine using a high-pressure hydrate reactor at 4 MPa, and formation temperature of 274.15 K, and a dissociation temperature of 277.15 K. CO2hydrate formation and dissociation experiments were also conducted using sodium dodecyl sulfate (SDS), pure water, and brine systems as standards for comparison. The findings show that all the studied amino acid systems show hydrate inhibition as compared to the pure water system with 35-41 reduction in CO2storage capacity. Further, l-methionine exhibited an optimum performance with a slight promotional effect at 0.2 wt  with the lowest induction time (35.6 min) and the highest CO2uptake (42.08 mol/mmol) among the studied amino acid systems. However, comparing l-methionine with SDS shows less induction time for SDS (28.48 min), indicating kinetic promotion of SDS over l-methionine in the presence of brine. The dissociation kinetics findings reveal the lowest dissociation rate for l-methionine and a prolonged time of CO2release compared to l-threonine and l-isoleucine, respectively. Nevertheless, all the considered amino acid systems exhibit more inhibition or stability for hydrate dissociation as compared to the pure water system. However, compared to SDS and brine systems, the amino acids l-methionine and l-isoleucine show a slight promotion effect, unlike l-threonine which exhibits strong kinetic inhibition. The results thus suggest that amino acid solutions in brine stabilize hydrate dissociation; however, the CO2hydrate formation inhibition in brine is quite discouraging for CO2storage purposes. Instead, applying amino acids in flow assurance could be an additional advantage due to the presence of brine in practical reservoir fluids during production. © 2022 American Chemical Society. All rights reserved.
%Z cited By 3