Dataset for the new insights into methane hydrate inhibition with blends of vinyl lactam polymer and methanol, monoethylene glycol, or diethylene glycol as hybrid inhibitors

Anton P Semenov; Yinghua Gong; Vladimir I Medvedev; Andrey S Stoporev; Vladimir A Istomin; Vladimir A Vinokurov; Tianduo Li

doi:10.1016/j.dib.2023.108892

Dataset for the new insights into methane hydrate inhibition with blends of vinyl lactam polymer and methanol, monoethylene glycol, or diethylene glycol as hybrid inhibitors

Data Brief. 2023 Jan 11:46:108892. doi: 10.1016/j.dib.2023.108892. eCollection 2023 Feb.

Authors

Anton P Semenov^{1

2}, Yinghua Gong^{1

2}, Vladimir I Medvedev², Andrey S Stoporev^{1

2}, Vladimir A Istomin^{2

3}, Vladimir A Vinokurov^{1

2}, Tianduo Li¹

Affiliations

¹ Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
² Department of Physical and Colloid Chemistry, Gubkin University, 65, Leninsky prospekt, Building 1, Moscow 119991, Russian Federation.
³ Skolkovo Institute of Science and Technology (Skoltech), Nobelya Str. 3, Moscow 121205, Russian Federation.

Abstract

Three-phase equilibrium conditions of vapor-aqueous solution-gas hydrate coexistence for the systems of CH₄-H₂O-organic thermodynamic inhibitor (THI) were experimentally determined. Hydrate equilibrium measurements for systems with methanol (MeOH), monoethylene glycol (MEG), and diethylene glycol (DEG) were conducted. Five concentrations of each inhibitor (maximum content 50 mass%) were studied in the pressure range of 4.9-8.4 MPa. The equilibrium temperature and pressure in the point of complete dissociation of methane hydrate during constant-rate heating combined with vigorous mixing of fluids (600 rpm) in a high-pressure vessel were determined. We compared our experimental points with reliable literature data. The coefficients of empirical equations are derived, which accurately describe hydrate equilibrium conditions for the studied systems. The effect of THI concentration and pressure on methane hydrate equilibrium temperature suppression was analyzed. In the second stage, we studied the kinetics of methane hydrate nucleation/growth in systems containing a polymeric KHI (0.5 mass% of N-vinylpyrrolidone and N-vinylcaprolactam copolymer) in water or THI aqueous solution. For this, temperatures, pressures, and subcoolings of methane hydrate onset were measured by rocking cell tests (RCS6 rig, ramp cooling at 1 K/h). Gas uptake curves characterizing the methane hydrate crystallization kinetics in the polythermal regime were obtained.

Keywords: Gas hydrate inhibitors; Gas hydrates; Gas uptake; Hydrate nucleation; Methane; Phase equilibria.