Abstract
In this study, we reported the dissociation conditions for the carbon dioxide hydrate in the presence of cyclic ethers such as 1,3,5-Trioxane, 2,5-Dihydrofuran, 1,3-Dioxolane, and 3,4-Dihydro-2H-pyran. We measured the three phase (H-Lw-V) experimental data by using isochoric method. The experiments were conducted in the carbon dioxide + water + cyclic ethers in the pressure from 1.6 MPa to 3.5 MPa. All of them were conducted at 10 wt %. The experimental results showed that 1,3,5-Trioxane, 2,5-Dihydrofuran, and 1,3-Dioxolane could increase the carbon dioxide hydrate equilibrium temperature at about 5 K, 6.9 K, and 4.2 K respectively. The cyclic ethers of 1,3,5-Trioxane, 2,5-Dihydrofuran, and 1,3-Dioxolane in this study could promote the formation of carbon dioxide hydrate, and the promoting effect decreased in the following order: 2,5-Dihydrofuran > 1,3,5-Trioxane > 1,3-Dioxolane. However, 3,4-Dihydro-2H-pyran showed the totally different result in carbon dioxide system. 3,4-Dihydro-2H-pyran could inhibit the carbon dioxide hydrate formation. The average inhibit temperature is about 1.3 K.
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