Kinetics of CO2 hydrate formation in a continuous flow reactor

Yang, Dali; Le, Loan; Martinez, Ronald; Currier, Robert P.; Spencer, D.F.

doi:10.1016/j.cej.2011.05.082

Cited by 57 publications

(17 citation statements)

References 42 publications

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“…To improve the rate of hydrate formation, there is an ongoing effort to search for suitable reactor designs, materials, and kinetic promoters that can enhance the gas uptake rate of hydrate formation. , For reducing the hydrate formation time and enhancing the kinetic performance, many researchers are working on improving the kinetics by innovation in reactor design (stirred tank, fixed bed, multitray, continuous flow, etc. ) − or using materials like silica sand, , foam, silica gels, , metal mesh/packing, Cr 2 O 3 , TiO 2 , nanofluids, multiwalled carbon nanotubes (MWNTs), graphite nanoparticles, aluminum surface, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of l-Tryptophan in Promoting the Kinetics of Carbon Dioxide Hydrate Formation

et al. 2020

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Carbon dioxide capture and storage (CCS) can play a vital role in overcoming global warming challenges and can help to reduce carbon footprint significantly from the environment. Carbon dioxide (CO2) hydrates are a potential option for CCS, but slow hydrate formation is a technical challenge that needs to be overcome. Kinetic promoters are often added to improve the formation rate of gas hydrates and process efficiency. In this systematic and comprehensive work, the performance of l-tryptophan, an environmentally friendly promoter, as a kinetic promoter for CO2 hydrate formation was evaluated using a stirred tank reactor. The kinetic performance of the CO2 hydrate formation process was evaluated using varying l-tryptophan concentrations (0, 100, 300, and 1000 ppm) under different experimental pressure and temperature conditions. The impact of l-tryptophan was assessed using gas uptake measurements (induction time, hydrate growth rate, and yield) coupled with visual observations through the front and top view of the reactor. With the addition of only 300 ppm l-tryptophan, an average gas uptake of 114 v/v (78% water conversion to hydrates) was achieved at 273.65 K and 3.4 MPa, which was four times that for the case without the promoter. Further increase in l-tryptophan concentration did not result in significant additional improvement. Compared to 277.65 K, experiments conducted at 273.65 and 275.65 K showed much shorter induction times and better gas uptake performance. With such an excellent enhancement effect at a low dosage and being environmentally friendly, l-tryptophan is recommended as a potential kinetic promoter for CO2 hydrate formation that could be applied for CO2 capture and storage via gas hydrate technology.

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Section: Introductionmentioning

confidence: 99%

Effect of l-Tryptophan in Promoting the Kinetics of Carbon Dioxide Hydrate Formation

et al. 2020

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“…When we focus on the aspect of discharging the heat released by hydrate formation, tubular reactors may be regarded as shell-and-tube heat exchangers, in each of which liquid water and a hydrate forming gas are flowing on the tube side while a coolant is flowing on the shell side. The coolant may be in a simple countercurrent flow in an unbaffled shell as illustrated in Figure 2 [3,32] or a more complex flow in a baffled or finned shell [33]. Alternatively, the coolant may be jetted or sprayed onto the tube wall from nozzles periodically aligned along the tube axis (or axes) in order to obtain a higher shell-side heat transfer coefficient.…”

Section: Tubular Reactorsmentioning

confidence: 99%

On the Scale-up of Gas-Hydrate-Forming Reactors: The Case of Gas-Dispersion-Type Reactors

Mori

2015

Energies

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For establishing hydrate-based technologies for natural-gas storage/transport, CO2 capture from industrial flue gases, etc., we need appropriate guidelines for the scale-up of hydrate production/processing equipment from laboratory scales to industrial scales. This paper aims to provide technical remarks on the scale-up of hydrate-forming reactors, the central components of hydrate production/processing equipment, particularly focusing on such a reactor design that hydrate-forming gas is dispersed in an aqueous phase which is either stirred in a tank or forced to flow through a tube. Based on the principles of classical fluid mechanics and heat-transfer analysis, the paper derives semi-empirical formulas that show how the capacity for heat discharge from each reactor and the power for operating the reactor are required to change with an increase in its size. Consequently, it is concluded that the stirred-tank design is unfavorable for significant scale-up and that the scale-up of tubular reactors should be made without significantly increasing the in-tube flow velocity.

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“…Extensive research has focused on the thermodynamics of the gas hydrate formation process (Eslamimanesh et al, 2012). Experimental investigations of CO 2 hydrate formation mechanisms have also been widely reported (Clarke and Bishnoi, 2005;Dashti and Lou, 2018;Teng et al, 1995;Uchida et al, 1999;Yang et al, 2011;Yin et al, 2018). However, an insightful understanding of the complex fundamentals of the process, such as nucleation, is still needed for the gas hydrate-based CO 2 capture (HBCC) process to become technically and economically viable at large scales.…”

Section: Introductionmentioning

confidence: 99%

Modeling of hydrate-based CO2 capture with nucleation stage and induction time prediction capability

Dashti

Thomas

Amiri

2019

Journal of Cleaner Production

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Gas hydrate technology is a promising approach for carbon capture. However, due to the multiphysics and multi-scale complexity of the process, this technology is not sufficiently understood for real-life scale applications. In particular, further fundamental studies of the hydrate formation mechanisms and rate are needed to achieve relevant insights into the process design and intensification. High-fidelity numerical models are crucial to capture and explain the dominant physicochemical mechanisms involved in the process. This paper presents a new variation of the shrinking core model (SCM) that can capture the practically observed features of the carbon dioxide (CO 2) hydration process, including the nucleation phase behavior and induction time, which have not been exploited previously. Accordingly, the most significant contribution of the current work to the literature is the proposal and demonstration of an efficient and rapid predictive tool for the CO 2 hydrate nucleation process. Moreover, a modelbased estimation of the induction time, as a critical parameter in CO 2 hydrate rate estimation and control, is presented. Additionally, the temperature history profile over the nucleation and growth phases is simulated and compared against experimental data from the literature. The proposed model offers an in-depth and rationale analysis tool compared to the primary forms of the SCM and other models in which the nucleation stage has been compromised for the sake of mathematical modeling and numerical solution simplicity. The proposed concept is generic enough to be used for CH 4 hydration process too.

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Kinetics of CO2 hydrate formation in a continuous flow reactor

Cited by 57 publications

References 42 publications

Effect of l-Tryptophan in Promoting the Kinetics of Carbon Dioxide Hydrate Formation

Effect of l-Tryptophan in Promoting the Kinetics of Carbon Dioxide Hydrate Formation

On the Scale-up of Gas-Hydrate-Forming Reactors: The Case of Gas-Dispersion-Type Reactors

Modeling of hydrate-based CO2 capture with nucleation stage and induction time prediction capability

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