Kinetics of (TBAF\u2009+\u2009CO2) semi-clathrate hydrate formation in the presence and absence of SDS

A H Mohammadi,A Mohammadi,A Jahangiri,M Pakzad

doi:10.1007/s12182-018-0221-6

A H Mohammadi, A Mohammadi + Show 2 more

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https://doi.org/10.1007/s12182-018-0221-6

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Abstract

In this communication, the impacts of adding SDS (sodium dodecyl sulfate), TBAF (tetra-n-butylammonium fluoride) and the mixture of SDS + TBAF on the main kinetic parameters of CO2 hydrate formation (induction time, the quantity and rate of gas uptake, and storage capacity) were investigated. The tests were performed under stirring conditions at T = 5 °C and P = 3.8 MPa in a 169 cm3 batch reactor. The results show that adding SDS with a concentration of 400 ppm, TBAF with a concentration of 1–5 wt%, and the mixture of SDS + TBAF, would increase the storage capacity of CO2 hydrate and the quantity of gas uptake, and decrease the induction time of hydrate formation process. The addition of 5 wt% of TBAF and 400 ppm of SDS would increase the CO2 hydrate storage capacity by 86.1% and 81.6%, respectively, compared to pure water. Investigation of the impact of SDS, TBAF and their mixture on the rate of gas uptake indicates that the mixture of SDS + TBAF does not have a significant effect on the rate of gas uptake during hydrate formation process.

Highlights

According to the Paris Agreement on Climate Change (2015), 195 United Nations members states agreed to reduce their carbon output as soon as possible (UNFCCC 2015).1 CO2, one of the main human-produced greenhouse gases, is a by-product of energy related industries (Bhattacharjee et al 2015)
The results show that adding SDS with a concentration of 400 ppm, tetra-n-butylammonium fluoride (TBAF) with a concentration of 1–5 wt%, and the mixture of SDS ? TBAF, would increase the storage capacity of CO2 hydrate and the quantity of gas uptake, and decrease the induction time of hydrate formation process
Investigation of the impact of SDS, TBAF and their mixture on the rate of gas uptake indicates that the mixture of SDS ? TBAF does not have a significant effect on the rate of gas uptake during hydrate formation process

Summary

Introduction

According to the Paris Agreement on Climate Change (2015), 195 United Nations members states agreed to reduce their carbon output as soon as possible (UNFCCC 2015). CO2, one of the main human-produced greenhouse gases, is a by-product of energy related industries (especially power plants) (Bhattacharjee et al 2015). CO2, one of the main human-produced greenhouse gases, is a by-product of energy related industries (especially power plants) (Bhattacharjee et al 2015). Chemical and physical absorption and chemical adsorption on zeolite are common ways to separate CO2 from gas mixtures (Herzog et al 1997; Kohl and Nielsen 1997; Kuramochi et al 2012; Peng and Zhuang 2012; Riemer 1996). These technologies are generally expensive and finding an energy efficient method to capture CO2 molecules is necessary. One of new and promising methods to separate CO2 from flue/industrial gases is using gas hydrate technology

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