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Almashwali AA, Khan MS, Lal B, Jin QC, Sabil KM, Khor SF. Inhibitory influence of amino acids on the formation kinetics of methane hydrates in oil-water and oil-brine systems. CHEMOSPHERE 2023; 312:137325. [PMID: 36423723 DOI: 10.1016/j.chemosphere.2022.137325] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 10/27/2022] [Accepted: 11/17/2022] [Indexed: 06/16/2023]
Abstract
This experimental study evaluates the inhibition performance of kinetic hydrates inhibitors (KHIs) of three amino acids, namely: glycine, proline, and alanine. It includes the performance comparison with the conventional inhibitor i.e., polyvinyl pyrrolidine (PVP) on methane (CH4) hydrate in oil systems in two different systems, i.e., deionized and brine water systems. The experiments were conducted in a high-pressure hydrate reactor replicating subsea pipeline conditions, i.e., the temperature of 274 K, pressure 8 MPa, and concentration of 1 wt%, by applying the isochoric cooling technique. The formation kinetics results suggest that all the studied amino acids effectively worked as kinetic inhibitors by potentially delaying CH4 hydrate formations due to their steric hindrance abilities. The interesting phenomenon was observed that the different studied amino acids behave differently in the brine-oil and deionized water-oil systems due to their side chain interaction. In a deionized water-oil system, glycine gives the highest inhibition performance by reducing the hydrate formation risk. On the contrary, in the brine-oil system, proline showed a significant inhibition effect. It should be noted that both glycine and proline were giving almost similar inhibition performance compared to the conventional hydrate inhibitor PVP, however glycine and proline significantly reduced CH4 consumption into hydrate due to their high surface active under CH4 conditions, which strengths the surface tension of the liquid/CH4 interface. Furthermore, according to the findings, it shows that increased side alkyl chain lengths of amino acids increase the efficacy of their kinetic hydration inhibition performance due to better surface adsorption abilities. The amino acids' ability to suppress growth is also linked strongly with hydrophobicity and alkyl side chain length. The findings of this study contribute significantly to current efforts to limit gas hydrate formation in offshore pipelines, particularly in oil-dominant pipelines.
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Affiliation(s)
- Abdulrab Abdulwahab Almashwali
- Chemical Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 32610 Perak, Malaysia; CO(2) Research Centre (CO(2)RES), Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 32610 Perak, Malaysia
| | - Muhammad Saad Khan
- CO(2) Research Centre (CO(2)RES), Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 32610 Perak, Malaysia
| | - Bhajan Lal
- Chemical Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 32610 Perak, Malaysia; CO(2) Research Centre (CO(2)RES), Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 32610 Perak, Malaysia.
| | | | - Khalik M Sabil
- PETRONAS Research Sdn Bhd, Kawasan Institusi Bangi, Lot 3288 3289 Off Jalan Ayer Itam, Kajang, Selangor 43000, Malaysia
| | - Siak Foo Khor
- Chemical Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 32610 Perak, Malaysia
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Rehman AU, Abdulwahab A, Kaur A, Khan MS, Zaini DB, Shariff AM, Lal B. Experimental investigation and modelling of synergistic thermodynamic inhibition of Diethylene Glycol and glycine mixture on CO 2 gas hydrates. CHEMOSPHERE 2022; 308:136181. [PMID: 36064016 DOI: 10.1016/j.chemosphere.2022.136181] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 08/11/2022] [Accepted: 08/20/2022] [Indexed: 06/15/2023]
Abstract
In this experimental and modelling study, Diethylene glycol (DEG) and Glycine (Gly) mixtures are introduced to hinder carbon dioxide hydrate formation by pushing the phase boundaries on the lower temperature side. The mixture of DEG and Gly with the ratio of 1:1 is experimented at 15, 10, and 5 wt% concentrations and the pressure vary from 2.5 to 4.0 MPa. The T-cycle method is employed to assess the effect of the studied blends on the CO2 hydrate by evaluating the hydrate dissociation temperature. Varied compositions of pure DEG and Gly as well as their mixtures are used to compute the synergistic effect. The studied system's thermodynamic hydrate inhibition (THI) influence is a concentration-driven phenomenon. Higher concentration can shift the hydrate liquid vapor equilibrium (HLVE) curve to lower temperatures and high-pressure regions. The outcomes depict that mixture of DEG and Gly at 15 wt%. Shows comparatively better results than the mixtures at 5 and 10 wt%, respectively. The obtained 10 wt% mixture results have also been compared with the conventional hydrate inhibitors and other THIs systems and provide a significant hydrate average suppression (ΔT) of 2.4 K. Furthermore, the freezing point-based Dickens and Quint Hunt model was also applied to predict the HLVE data of CO2 hydrates and satisfactory agreement found with maximum mean absolute error (MAE) of 0.498 K. A better inhibitory performance was seen when diethylene glycol and glycine were combined, demonstrating the potential of amino acids as synergistic inhibitors in the exploitation of hydrates, transportation of oil and gas, and flow assurance.
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Affiliation(s)
- Adeel Ur Rehman
- CO(2) Research Centre (CO2RES), Universiti Teknologi PETRONAS, Tronoh, 32610, Perak, Malaysia; Department of Chemical Engineering, Universiti Teknologi of PETRONAS, Bandar Seri Iskandar, 32610, Perak, Malaysia
| | - Abdulrab Abdulwahab
- CO(2) Research Centre (CO2RES), Universiti Teknologi PETRONAS, Tronoh, 32610, Perak, Malaysia; Department of Chemical Engineering, Universiti Teknologi of PETRONAS, Bandar Seri Iskandar, 32610, Perak, Malaysia
| | - Asrajjit Kaur
- CO(2) Research Centre (CO2RES), Universiti Teknologi PETRONAS, Tronoh, 32610, Perak, Malaysia
| | - Muhammad Saad Khan
- CO(2) Research Centre (CO2RES), Universiti Teknologi PETRONAS, Tronoh, 32610, Perak, Malaysia
| | - Dzulkarnain B Zaini
- Department of Chemical Engineering, Universiti Teknologi of PETRONAS, Bandar Seri Iskandar, 32610, Perak, Malaysia
| | - AzmiB M Shariff
- CO(2) Research Centre (CO2RES), Universiti Teknologi PETRONAS, Tronoh, 32610, Perak, Malaysia; Department of Chemical Engineering, Universiti Teknologi of PETRONAS, Bandar Seri Iskandar, 32610, Perak, Malaysia
| | - Bhajan Lal
- CO(2) Research Centre (CO2RES), Universiti Teknologi PETRONAS, Tronoh, 32610, Perak, Malaysia; Department of Chemical Engineering, Universiti Teknologi of PETRONAS, Bandar Seri Iskandar, 32610, Perak, Malaysia.
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Burla SK, Pinnelli SRP, Sain K. Explicating the amino acid effects for methane storage in hydrate form. RSC Adv 2022; 12:10178-10185. [PMID: 35424906 PMCID: PMC8968567 DOI: 10.1039/d2ra00531j] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 03/22/2022] [Indexed: 01/05/2023] Open
Abstract
Methane emissions increase day by day into the atmosphere and influence global temperatures. The necessity to capture these emissions at the source point is a primary concern. Several methods/techniques are being adopted to capture these emissions. The methane hydrates could be a viable method among them. The present study exposes various amino acids' effects in methane hydrate formation. The formation temperatures are around ∼268 to 273 K except for l-cys, which is about ∼277 K. The required subcooling for hydrates to trigger is high and is increasing in the order l-thr > l-met > l-phe > l-val > l-cys. The methane hydrate conversion is high in the presence of nearly all the amino acids with methane uptake capacity of ∼80–85%, except l-thr, for which it is only 30% of the total uptake capacity. The side chain of l-thr comprises the hydroxyl group, making it a polar and uncharged amino acid. It is ascertained that hydroxyl groups alone can form hydrogen bonds with water, increasing the hydrophilicity and solubility of molecules, causing lesser conversion in the l-thr system. The gas uptake kinetics is faster in l-met and l-phe systems (t90 ∼ 40 min), and sluggish kinetics is observed in l-cys, l-val, and l-thr systems. The investigations positively indicate using amino acids, l-met, l-phe, l-cys, and l-val as efficient materials for methane gas capture and storage in hydrate form, although not l-thr. Amino acids are readily dissolvable in water and could be easily pelletized for methane gas storage and transportation. Methane gas storage in the hydrate form using amino acids.![]()
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Affiliation(s)
- Sai Kiran Burla
- Gas Hydrate Division, CSIR-National Geophysical Research Institute (CSIR-NGRI) Hyderabad-500 007 India +91 40 2717 1564 +91 40 2701 2710.,Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 India
| | - S R Prasad Pinnelli
- Gas Hydrate Division, CSIR-National Geophysical Research Institute (CSIR-NGRI) Hyderabad-500 007 India +91 40 2717 1564 +91 40 2701 2710.,Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 India
| | - Kalachand Sain
- Wadia Institute of Himalayan Geology (WIHG) 33 GMS Road Dehradun-248001 Uttarakhand India
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Ul Haq I, Lal B, Zaini DB. Experimental and modelling study of ammonium based ionic liquids in the absence and presence of methanol for CO2 hydrates. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118214] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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