Loading...
Please wait, while we are loading the content...
Similar Documents
Propane, n-butane and i-butane stabilization effects on methane gas hydrates
| Content Provider | Semantic Scholar |
|---|---|
| Author | Smith, Callum Pack, David R. Barifcani, Ahmed |
| Copyright Year | 2017 |
| Abstract | Abstract The goal of this work is to analyse the hydrate equilibria of methane + propane, i-butane and n -butane gas mixtures. Experimental hydrate equilibrium data was acquired for various compositions of these components in methane, ranging from 0.5 to 6.8 mol%. Applying this information with the Clausius-Clapeyron equation, the extent of hydrate promotion was demonstrated quantitatively by calculating the slope of the equation and the dissociation enthalpy ( ΔH d ). Methane equilibria was found to be most sensitive towards propane and i-butane, where very small concentrations were sufficient to increase the thermodynamic conditions for hydrate equilibrium drastically. The degree of hydrate stabilisation, i.e. transition from sI to sII hydrate, was immediate – there was no detectable composition slightly above 0.0 mol% where propane or i-butane did not have a sII hydrate-promoting impact, although one was implied with the aid of Calsep PVTsim calculations. Addition of n -butane to methane was far less sensitive and was deemed inert from 0.0 to 0.5 mol%. It was concluded that the sII hydrate was favoured when the n -butane composition exceeded 0.5–0.75 mol%. The influence of composition on stability was quantified by determining the gradient of ΔH d versus mol% plots for the initial steep region that represents the increasing occupancy of the sII guests. Average gradients of 11.66, 26.64 and 43.50 kJ/mol.mol% were determined for n -butane, propane and i-butane addition to methane respectively. A hydrate-inert range for propane/i-butane (in methane) was suspected according to the perceived inflection point when less 0.5 mol%, implying the gradient was very low at some minute concentration range starting at 0.0 mol%. Awareness of these sI to sII transition regions is beneficial to natural gas recovery and processing as a small percentage of these components may remain without being detrimental in terms of promoting the hydrate equilibria. |
| Starting Page | 293 |
| Ending Page | 301 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/j.jct.2017.08.013 |
| Volume Number | 115 |
| Alternate Webpage(s) | https://espace.curtin.edu.au/bitstream/handle/20.500.11937/56661/255722.pdf?isAllowed=y&sequence=2 |
| Alternate Webpage(s) | https://doi.org/10.1016/j.jct.2017.08.013 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
