I work in propane hydrate formation but unfortunatly i cant form it
i try in p=4barg and T=1c
some of my tests was formed but now i cant form it
Equilebruim pressure in 1c for propane is 2 bar
and propane became liquid in 4.1 bar in this pressure
Dear Saeid,
H2S is used as a hydrate promoter. You can mix H2S with propane and you may get positive results. You can try my VLE software, EQ-COMP for calculating hydrate P-T curve for most of the pure hydrate formers and hydrocarbon mixtures of non-polar compounds.
More details and sample results for hydrate curve calculation module of EQ-COMP are available at the attached link.
Sample results of hydrate curve calculation module of EQ-COMP are attached also.
http://www.eq-comp.com/hydrate-dissociation-equilibrium-curve-calculator-software/
To make sure that you form hydrates you can go subzero and form some ice (metastable) and then increase the temperature just above freezing your system will convert to hydrates very quickly.
If you try to grow pure propane hydrate from liquid water then obviously you cannot use super expensive Xe and highly toxic H2S. In stead, approach the issue with this what you possibly already know. Just connect dots together. All reactions of liquid water and gas leading to gas hydrates are severely limited by the size of the interface. What does it mean? A suitable ration between gas and water molecules can be met only in the very close vicinity to the water-gas interface. Nowhere else. If you have a static system you will create as little as a thin film of GH at the water-gas interface. That is all. Further growth will be glacial slow because of the diffusion limited transfer across the GH film into gas under-saturated liquid. How to accelerate it? The answer is very simple: rapid stirring. Again, what does it do? Stirring is increasing the size of your interface by introducing nano-bubbles into the liquid water that will serve for nucleation points in the bulk water. You see, you cannot dissolve enough gas in water to reach the stoichiometric ratio to form GH lattice. This is a very gross misunderstanding repeated over good two decades in GH community. Nature and scientists in the lab do it via nanobubbles (even if often unknowingly). Anyhow, if you just want to form propane hydrates use ice. It will be soo much easier and faster...
You can use a microbubble generator to form microbubbles of propane which have a tendency to immediately convert to hydrates. You can use hydrate seeds or crushed ice for initial nucleation.
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