The Thermodynamic and Kinetic Effects of Sodium Lignin Sulfonate on Ethylene Hydrate Formation

Yiwei Wang, Lin Wang, Zhen Hu, Youli Li, Qiang Sun, Aixian Liu, Lanying Yang, Jing Gong and Xuqiang Guo
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Yiwei Wang: State Key Laboratory of Heavy Oil Processing, China University of Petroleum Beijing at Karamay, Karamay 834000, China
Lin Wang: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, China
Zhen Hu: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, China
Youli Li: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, China
Qiang Sun: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, China
Aixian Liu: State Key Laboratory of Heavy Oil Processing, China University of Petroleum Beijing at Karamay, Karamay 834000, China
Lanying Yang: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, China
Jing Gong: National Engineering Laboratory for Pipeline Safety/MOE Key Laboratory of Petroleum Engineering/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum (Beijing), Beijing 102249, China
Xuqiang Guo: State Key Laboratory of Heavy Oil Processing, China University of Petroleum Beijing at Karamay, Karamay 834000, China

Energies, 2021, vol. 14, issue 11, 1-19

Abstract: Hydrate-based technologies (HBTs) have high potential in many fields. The industrial application of HBTs is limited by the low conversion rate of the water into hydrate ( R WH ), and sodium lignin sulfonate (SLS) has the potential to solve the above problem. In order to make the HBTs in the presence of SLS applied in industry and promote the advances of commercial HBTs, the effect of SLS on the thermodynamic equilibrium hydrate formation pressure ( P eq ) was investigated for the first time, and a new model (which can predict the P eq ) was proposed to quantitatively describe the thermodynamic effect of SLS on the hydrate formation. Then, the effects of pressure and initial SLS concentration on the hydrate formation rate ( r R ) at different stages in the process of hydrate formation were investigated for the first time to reveal the kinetic effect of SLS on hydrate formation. The experimental results show that SLS caused little negative thermodynamic effect on hydrate formation. The P eq of the ethylene-SLS solution system predicted by the model proposed in this work matches the experimental data well, with an average relative deviation of 1.6% and a maximum relative deviation of 4.7%. SLS increased R WH : the final R WH increased from 57.6 ± 1.6% to higher than 70.0% by using SLS, and the highest final R WH (77.0 ± 2.1%) was achieved when the initial SLS concentration was 0.1 mass%. The r R did not significantly change as R WH increased from 35% to 65% in the formation process in the presence of SLS. The effect of increasing pressure on increasing r R decreased with the increase in R WH when R WH was lower than 30%, and the difference in pressure led to little difference in the r R when R WH was higher than 30%.

Keywords: hydrate; thermodynamics; kinetics; sodium lignin sulfonate; model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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