Abstract
This work considers the possibility of separating the natural gas from the Orenburg field using gas hydrate crystallization technology to purify methane from impurities. The effect of the mixture composition, process temperature, and pressure on the separation efficiencyof the gas mixture CH4 - C2H6 - C3H8 - i-C4H10 - н-C4H10 - C5H12 - N2 - H2S - CO2 was mathematically modeled. Efficiency was determined based on gas hydrate distribution coefficients. It was shown that the CH4 gas hydrate distribution coefficient variedinsignificantly with the field operation time and amounted to less than 1. The predominant concentration of CH4, n-C4H10, n-C5H12, N2, CO2 in the gas phase and C3H8, i-C4H10, H2S in the gas hydrate phase was established. In the studied temperature (268.15-283.15 K) and pressure (2.00-8.00 MPa) ranges, the maximum gas hydrate distribution coefficient of C3H8, i-C4H10, and H2S was foundto be 32.32, 44.66, and 31.61, respectively, at 268.15 K and 8 MPa.
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