Study on the influence of L-methionine concentrations on carbon dioxide hydrate stability under different decomposition pressures

doi:10.13745/j.esf.sf.2025.2.8

Abstract

Abstract:

The storage of carbon dioxide (CO₂) hydrate using promoters has garnered significant attention in the context of increasing energy demand and the “dual carbon” goals. However, different promoters exhibit varying effects on the properties of CO₂ hydrate. This study investigates the formation and stability of CO₂ hydrate using silica gel as a porous medium under initial formation conditions of 3.0 MPa and 274.15 K, followed by decomposition at 275.15 K. The effects of decomposition pressures (0, 0.5, and 1 MPa) on the stability of CO₂ hydrate were analyzed in systems containing pure water and L-Met (L-methionine) solutions at concentrations of 0.8, 0.9, 1.0, 1.1, and 1.2 g/L. The results show that the CO₂ hydrate in the 1.1 g/L L-Met solution exhibits the highest stability at a decomposition pressure of 0 MPa. The 0.9 g/L L-Met solution provides the best hydrate stability at decomposition pressures of 0.5 MPa and 1 MPa, which is favorable for stable hydrate storage. In addition to analyzing the influence of L-Met concentrations on hydrate stability, the effect of decomposition pressure on hydrate dissociation rates was also studied. In the pure water system, the dissociation rate initially increases and then decreases under a decomposition pressure of 0 MPa. For all other decomposition pressures, the maximum dissociation rate occurs at the initial stage, followed by a monotonic decrease. Furthermore, in L-Met systems, except for the 0.8 g/L concentration, the dissociation rate of hydrate under atmospheric pressure (0 MPa) initially increases and then decreases, demonstrating the “self-protection” effect of hydrate. However, the dissociation rate reaches its maximum at the initial moment and monotonically decreases at decomposition pressures of 0.5 MPa and 1 MPa, indicating that higher pressures undermine the self-protection effect. This study provides insights into the effects of promoter concentration and decomposition pressure on the stability and dissociation behavior of CO₂ hydrate, contributing to advancements in hydrate-based CO₂ storage technologies.

Key words: carbon dioxide hydrate, silica gel, L-Methionine, dissociation pressure, stability

CLC Number:

P744.4
P599

WANG Yingmei, WANG Lijin, TENG Yadong, JIANG Xuechen, ZHANG Peng. Study on the influence of L-methionine concentrations on carbon dioxide hydrate stability under different decomposition pressures[J]. Earth Science Frontiers, 2025, 32(2): 195-205.

Figures/Tables 8

Fig.1 The experimental device for the analysis of CO2 hydrate formation and stability

Table 1 Experiment materials

材料	参数	厂家
二氧化碳(CO₂)	纯度:99.99%	兰州中科凯特有限公司
酒精(C₂H₅OH)	纯度:95.0%	兰州中科凯特有限公司
去离子水(H₂O)	电导率: 18.25 MΩ·cm	自制
L-蛋氨酸(L-Met)	纯度:98.0%	上海湘泓生物科技有限公司
硅胶	粒径:0.5~1 mm, 合格率:≥99%	青岛宸容新材料有限公司

Fig.2 Temperature and pressure variation curves of CO2 hydrate decomposition under different concentrations of LMet system and decomposition pressures

Fig.3 Variation curves of CO2 hydrate decomposition rate with time in LMet system with different concentrations under three decomposition pressures

Fig.4 Average decomposition rate of CO2 hydrate in LMet system under different decomposition pressures

Fig.5 Percentage decomposition of CO2 hydrate in LMet system with different concentrations under three decomposition pressures as a function of time

Fig.6 Relationship curves of CO2 hydrate decomposition rate and decomposition pressure in different concentrations of LMet system

Fig.7 Percentage decomposition curves of CO2 hydrate in different concentrations of LMet system

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