The Experts below are selected from a list of 3735 Experts worldwide ranked by ideXlab platform
Hanna K. Knuutila - One of the best experts on this subject based on the ideXlab platform.
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thermal stability and corrosion of tertiary amines in aqueous amine and amine glycol water solutions for combined acid gas and water removal
Journal of Natural Gas Science and Engineering, 2019Co-Authors: Usman Shoukat, Eva Baumeister, Diego Di Domenico Pinto, Hanna K. KnuutilaAbstract:Abstract Thermal stability and corrosion of seven tertiary amines (20 wt.%) solutions in water and water-glycol [ethylene glycol (MEG)/tri-ethylene glycol (TEG)] loaded with CO2 in stainless steel reactors has been studied for combined acid gas removal along with Hydrate Control. The pKa of the tested amines varied from 7.85 to 9.75. Titration and inductivity coupled plasma mass spectrometry (ICP-MS) are used to quantify the remaining alkalinity and metal concentrations in amine solutions respectively. The presence of MEG and TEG profoundly influenced the amine stability. Triethanolamine had the highest thermal stability. Furthermore, the results also show that an increase in pKa generally decreases corrosion. 3-(Diethylamino)-1,2-propanediol (DEA-1,2-PD) has the lowest corrosion in water and water-TEG solutions while 2-(Diethylamino)ethanol (DEEA) has the least corrosion in water-MEG solutions.
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Thermal stability and corrosion studies of amines for combined acid gas removal and Hydrate Control for subsea gas treatment systems
2016 Techno-Ocean (Techno-Ocean), 2016Co-Authors: Usman Shoukat, Georgios Fytianos, Hanna K. KnuutilaAbstract:In order to meet future challenges in subsea production and processing compact systems for Hydrate Control and selective H2S/CO2 removal can be used. The development of an amine-based regenerative process whereby both water and H2S/CO2 are removed may involve corrosion problems. In this study, the amine stability and corrosion tendencies of 30 wt% aqueous solutions of 2-ethanolamine and N-Methydiethanolamine under high temperatures in presence of MEG/TEG, have been experimentally studied. The results show that the presence of MEG/TEG (in the absence of water) influence both the amine degradation and corrosion. Furthermore, the results indicate that the influence of MEG or TEG is dependent on the amine used.
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combined hydrogen sulfide removal and Hydrate Control for subsea application simulation study
Techno-Ocean, 2016Co-Authors: Eirini Skylogianni, Mari I Lilleng, Hanna K. KnuutilaAbstract:The feasibility of the combination of hydrogen sulfide removal and dehydration is investigated in this work using Aspen Plus simulation software. First, the simulation model is validated against experimental data from the literature. Secondly, two process configurations are examined for the simultaneous removal of hydrogen sulfide and water vapor, and Aspen Plus limitations are discussed. Pressure of 100 bar was used in the absorption simulation, in order to simulate subsea high pressure while three different natural gas compositions, with increasing hydrogen sulfide content, were studied. The absorption performance using a mixed methyldiethanolamine (MDEA)-monoethylene glycol (MEG) solvent in one contactor was not possible due to convergence problems. Absorption of H 2 S and CO 2 in aqueous MDEA, and H 2 O in aqueous MEG, including regeneration of the solvents, was therefore simulated separately and further analysis was performed. The specific reboiler duties required to meet the H 2 S content specification for trouble-free gas transportation in the sweet gas, using an aqueous MDEA solution for optimum Liquid-to-Gas ratio in the absorber, are in agreement with values reported in the literature. Gas dehydration in order to meet the water dew point specifications was also investigated.
Mohammad Reza Talaghat - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation of natural gas components during gas Hydrate formation in presence or absence of the l tyrosine as a kinetic inhibitor in a flow mini loop apparatus
Journal of Chemical and Petroleum Engineering, 2011Co-Authors: Mohammad Reza TalaghatAbstract:Hydrates are crystalline compounds similar to ice, with guest molecules like methane and ethane trapped inside cavities or cages formed by the hydrogen bounded framework of water molecules. These solid compounds give rise to problems in the natural gas oil industry because they can plug pipelines and process equipments. Low dosage Hydrate inhibitors are a recently developed Hydrate Control technology, which can be more cost-effective than traditional practices such as methanol and glycols. The main objective of the present work is to experimentally investigate simple gas Hydrate formation with or without the presence of kinetic inhibitors in a flow mini-loop apparatus. For this purpose, a laboratory flow mini-loop apparatus was set up to measure the induction time and gas consumption rate during gas Hydrate formation when a Hydrate forming substance such as methane, ethane, propane, carbon dioxide and iso- butane is contacted with water in the absence or presence of dissolved inhibitor at various concentration under suitable temperature and pressure conditions. In each experiment, a water blend saturated with pure gas is circulated up to a required pressure. Pressure is maintained at a constant value during experimental runs by means of the required gas make-up. The effect of pressure on gas consumption during Hydrate formation is investigated with or without the presence of PVP (polyvinylpyrrolidone) and L-tyrosine as kinetic inhibitors at various concentrations. The experimental results show that increasing the pressure of the system, causes to increase the experimental gas consumption and decrease the induction time. Also, the extent of gas Hydrate formation at a given time is clearly less in the presence of the inhibitors. Moreover, when comparing the gas consumption during the Hydrate formation for simple gas Hydrate formation in presence of PVP and L-tyrosine inhibitors, it is seen that the gas consumption in presence of L-tyrosine is lower than that of PVP for all experiments.
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experimental and theoretical investigation of simple gas Hydrate formation with or without presence of kinetic inhibitors in a flow mini loop apparatus
Fluid Phase Equilibria, 2009Co-Authors: Mohammad Reza Talaghat, Feridun Esmaeilzadeh, Jamshid FathikaljahiAbstract:Abstract Gas Hydrates are ice-like crystalline compounds, which form through a combination of water and suitably sized guest molecules under low temperature and elevated pressure conditions. These solid compounds give rise to problems in the natural gas oil industry because they can plug pipelines and process equipment. Low dosage Hydrate inhibitors are a recently developed Hydrate Control technology, which can be more cost-effective than traditional practices such as methanol and glycols. The kinetics of Hydrate growth has been modeled by numerous authors who have measured the gas consumption rate during Hydrate formation in batch agitator reactors. The main objective of the present work is to investigate experimentally of simple gas Hydrate formation with or without the presence of kinetic inhibitors in a flow mini-loop apparatus. To predict the gas consumption rate during Hydrate formation in this system, the rate equation based on the Kashchiev and Firoozabadi model for simple gas Hydrate formation in a batch system was developed for this objective. To complete the theoretical evaluation of gas Hydrate formation through the pipeline with or without the presence of kinetic Hydrate inhibitors (KHIs), a laboratory flow mini-loop apparatus was set up to measure the induction time for Hydrate formation and the uptake rate when a Hydrate forming substance (such as C1, C3, CO 2 and i-C4) is contacted with water in the absence or presence of dissolved inhibitor under suitable temperature and pressure conditions. In each experiment, a water blend saturated with pure gas is circulated up to a required pressure. Pressure is maintained at a constant value during experimental runs by means of the required gas make-up. The effect of pressure on gas consumption during Hydrate formation is investigated with or without the presence of polyvinylpyrrolidone (PVP) and l -tyrosine as kinetic inhibitors at various concentrations. A good agreement is found between the predicted and experimental data with or without the presence of KHIs. The total average absolute deviation percent between the experimental and predicted gas consumption is found to be 15.8% and 14.9% for simple gas Hydrate formation with or without presence of kinetic inhibitors, respectively.
Jamshid Fathikaljahi - One of the best experts on this subject based on the ideXlab platform.
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experimental and theoretical investigation of simple gas Hydrate formation with or without presence of kinetic inhibitors in a flow mini loop apparatus
Fluid Phase Equilibria, 2009Co-Authors: Mohammad Reza Talaghat, Feridun Esmaeilzadeh, Jamshid FathikaljahiAbstract:Abstract Gas Hydrates are ice-like crystalline compounds, which form through a combination of water and suitably sized guest molecules under low temperature and elevated pressure conditions. These solid compounds give rise to problems in the natural gas oil industry because they can plug pipelines and process equipment. Low dosage Hydrate inhibitors are a recently developed Hydrate Control technology, which can be more cost-effective than traditional practices such as methanol and glycols. The kinetics of Hydrate growth has been modeled by numerous authors who have measured the gas consumption rate during Hydrate formation in batch agitator reactors. The main objective of the present work is to investigate experimentally of simple gas Hydrate formation with or without the presence of kinetic inhibitors in a flow mini-loop apparatus. To predict the gas consumption rate during Hydrate formation in this system, the rate equation based on the Kashchiev and Firoozabadi model for simple gas Hydrate formation in a batch system was developed for this objective. To complete the theoretical evaluation of gas Hydrate formation through the pipeline with or without the presence of kinetic Hydrate inhibitors (KHIs), a laboratory flow mini-loop apparatus was set up to measure the induction time for Hydrate formation and the uptake rate when a Hydrate forming substance (such as C1, C3, CO 2 and i-C4) is contacted with water in the absence or presence of dissolved inhibitor under suitable temperature and pressure conditions. In each experiment, a water blend saturated with pure gas is circulated up to a required pressure. Pressure is maintained at a constant value during experimental runs by means of the required gas make-up. The effect of pressure on gas consumption during Hydrate formation is investigated with or without the presence of polyvinylpyrrolidone (PVP) and l -tyrosine as kinetic inhibitors at various concentrations. A good agreement is found between the predicted and experimental data with or without the presence of KHIs. The total average absolute deviation percent between the experimental and predicted gas consumption is found to be 15.8% and 14.9% for simple gas Hydrate formation with or without presence of kinetic inhibitors, respectively.
Usman Shoukat - One of the best experts on this subject based on the ideXlab platform.
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thermal stability and corrosion of tertiary amines in aqueous amine and amine glycol water solutions for combined acid gas and water removal
Journal of Natural Gas Science and Engineering, 2019Co-Authors: Usman Shoukat, Eva Baumeister, Diego Di Domenico Pinto, Hanna K. KnuutilaAbstract:Abstract Thermal stability and corrosion of seven tertiary amines (20 wt.%) solutions in water and water-glycol [ethylene glycol (MEG)/tri-ethylene glycol (TEG)] loaded with CO2 in stainless steel reactors has been studied for combined acid gas removal along with Hydrate Control. The pKa of the tested amines varied from 7.85 to 9.75. Titration and inductivity coupled plasma mass spectrometry (ICP-MS) are used to quantify the remaining alkalinity and metal concentrations in amine solutions respectively. The presence of MEG and TEG profoundly influenced the amine stability. Triethanolamine had the highest thermal stability. Furthermore, the results also show that an increase in pKa generally decreases corrosion. 3-(Diethylamino)-1,2-propanediol (DEA-1,2-PD) has the lowest corrosion in water and water-TEG solutions while 2-(Diethylamino)ethanol (DEEA) has the least corrosion in water-MEG solutions.
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Thermal stability and corrosion studies of amines for combined acid gas removal and Hydrate Control for subsea gas treatment systems
2016 Techno-Ocean (Techno-Ocean), 2016Co-Authors: Usman Shoukat, Georgios Fytianos, Hanna K. KnuutilaAbstract:In order to meet future challenges in subsea production and processing compact systems for Hydrate Control and selective H2S/CO2 removal can be used. The development of an amine-based regenerative process whereby both water and H2S/CO2 are removed may involve corrosion problems. In this study, the amine stability and corrosion tendencies of 30 wt% aqueous solutions of 2-ethanolamine and N-Methydiethanolamine under high temperatures in presence of MEG/TEG, have been experimentally studied. The results show that the presence of MEG/TEG (in the absence of water) influence both the amine degradation and corrosion. Furthermore, the results indicate that the influence of MEG or TEG is dependent on the amine used.
Thor M Svartaas - One of the best experts on this subject based on the ideXlab platform.
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studies on some zwitterionic surfactant gas Hydrate anti agglomerants
Chemical Engineering Science, 2006Co-Authors: Malcolm A Kelland, Thor M Svartaas, Jorunn Ovsthus, Takashi Tomita, Junichi ChosaAbstract:Abstract Low dosage Hydrate inhibitors (LDHIs) are a recently developed Hydrate Control technology, which can be more cost-effective than traditional practices such as the use of thermodynamic inhibitors e.g. methanol and glycols. Two classes of LDHI called kinetic inhibitors (KHIs) and anti-agglomerants (AAs) are already being successfully used in the field. This paper describes efforts to develop new classes of AAs based on zwitterionic surfactants. The chemistry of the new surfactants is described along with experiments to determine their performance carried out in high pressure cells and a wheel loop. The results indicate positive performance for some products but not as good as a commercial quaternary ammonium-based surfactant AA. It was also shown that best results were obtained if the two ionic groups are spaced far apart from each other in the molecule. The best AA molecule tested was 3-[ N , N - dibutyl- N -(2-(3-carboxy-pentadecenoyloxy)propyl)]ammonio propanoate. It performed well in sapphire cell tests at up to 15.9 °C subcooling. Its performance was fairly good in the wheel loop at 13.4 °C subcooling, but failed at 16.5 °C subcooling. 3-[ N , N -dibutyl- N -(2- hydroxypropyl)ammonio]propanoate was also shown to be an excellent synergist for polyvinylcaprolactam KHIs.
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a new class of kinetic Hydrate inhibitor
Annals of the New York Academy of Sciences, 2006Co-Authors: Thor M Svartaas, Jorunn Ovsthus, Takashi NambaAbstract:Abstract: Low dosage Hydrate inhibitors (LDHI) offer a recently developed Hydrate Control technology that can be more cost-effective than traditional practices, such as the use of thermodynamic inhibitors (e.g., methanol and glycols). One class of LDHI, called kinetic inhibitors, is already being successfully used in the field. This paper describes efforts to develop a new class of kinetic inhibitor that shows various improvements over existing commercial technology. The polymer chemistry of the inhibitors and experiments carried out in high pressure cells and wheel/loops is described.
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Studies on some alkylamide surfactant gas Hydrate anti-agglomerants
Chemical Engineering Science, 2006Co-Authors: Malcolm A Kelland, Thor M Svartaas, Jorunn Ovsthus, Takashi Tomita, Keiichiro MizutaAbstract:Low dosage Hydrate inhibitors (LDHIs) are a recently developed Hydrate Control technology, which can be more cost-effective than traditional practices such as the use of thermodynamic inhibitors e.g., methanol and glycols. Two classes of LDHI called kinetic inhibitors (KHIs) and anti-agglomerants (AAs) are already being successfully used in the field. This paper describes efforts to develop new classes of AA surfactant with one or two alkylamide groups in the polar head. The goal was to find an AA that was as good as commercial quaternary AAs, which would be economically competitive and more environmentally friendly. The chemistry and environmental properties of the new surfactants are described along with experiments to determine their performance carried out in high-pressure sapphire cells and a wheel loop. The results indicate positive performance for some products but not as good as a commercial quaternary ammonium-based surfactant AA. The best surfactants had one or two carbonylpyrrolidine or isopropylamide groups in the head. The performance of the best AAs was found to be dependent on the hydrocarbon phase and salinity of the water phase.
