Dataset for the phase equilibria and PXRD studies of urea as a green thermodynamic inhibitor of sII gas hydrates
Anton P. Semenov,
Yinghua Gong,
Rais I. Mendgaziev,
Andrey S. Stoporev,
Vladimir A. Vinokurov,
Tianduo Li
Affiliations
Anton P. Semenov
Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China; Gubkin University, Department of Physical and Colloid Chemistry, 65, Leninsky prospekt, Building 1, Moscow 119991, Russian Federation; Corresponding authors.
Yinghua Gong
Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China; Gubkin University, Department of Physical and Colloid Chemistry, 65, Leninsky prospekt, Building 1, Moscow 119991, Russian Federation
Rais I. Mendgaziev
Gubkin University, Department of Physical and Colloid Chemistry, 65, Leninsky prospekt, Building 1, Moscow 119991, Russian Federation
Andrey S. Stoporev
Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China; Gubkin University, Department of Physical and Colloid Chemistry, 65, Leninsky prospekt, Building 1, Moscow 119991, Russian Federation; Department of Petroleum Engineering, Kazan Federal University, Kremlevskaya str. 18, Kazan 420008, Russian Federation
Vladimir A. Vinokurov
Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China; Gubkin University, Department of Physical and Colloid Chemistry, 65, Leninsky prospekt, Building 1, Moscow 119991, Russian Federation
Tianduo Li
Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China; Corresponding authors.
The equilibrium conditions of sII methane/propane hydrates have been experimentally determined for the C3H8/CH4-H2O-urea system. The equilibrium dissociation temperatures and pressures of sII hydrates span a wide P,T-range (266.7–293.9 K; 0.87–9.49 MPa) and were measured by varying the feed mass fraction of urea in solution from 0 to 50 mass%. The experimental points at feed urea concentration ≤ 40 mass% correspond to the V-Lw-H equilibrium (gas-aqueous urea solution-gas hydrate). A four-phase V-Lw-H-Su equilibrium (with an additional phase of solid urea) was observed because the solubility limit of urea in water was reached for all points at a feed mass fraction of 50 mass% and for one point at 40 mass% (266.93 K). Gas hydrate equilibria were measured using a high-pressure rig GHA350 under isochoric conditions with rapid fluid stirring and slow ramp heating of 0.1 K/h. Each measured point represents complete dissociation of the sII hydrate. The phase equilibrium data was compared with the literature reported for the C3H8/CH4-H2O and CH4-H2O-urea systems. A comprehensive analysis of the thermodynamic inhibition effect of urea to sII C3H8/CH4 hydrates on pressure and concentration of the inhibitor was carried out. The phase composition of the samples was analyzed by powder X-ray diffractometry at 173 K.
