Enhanced Study of CO 2 Hydrate Formation in Marine Oil–Gas Based on Additive Effect.

During marine oil–gas extraction, significant amounts of carbon dioxide (CO₂) gas are often produced. Effectively separating these associated CO₂ gases during extraction has become a critical technical challenge. Therefore, this paper aims to enhance the efficiency of CO₂ hydrate-based capture technology and conduct relevant research. The goal is to increase the driving force for hydrate formation by combining the traditional thermodynamic additive TBAB with pressure modulation and to improve the hydrate formation rate through the use of multiple kinetic promoters. This paper presents the initial investigation into the effect of the thermodynamic accelerator tetrabutylammonium bromide (TBAB) on the characteristics of CO₂ hydrate formation. The promotion effects of TBAB solutions with varying mass concentrations (3%, 5%, 7.5%, 10%) and reaction pressures (3 MPa, 4 MPa) were subjected to a systematic analysis, and the optimal conditions were identified as 4 MPa and a 5 wt% TBAB concentration. Subsequently, the impact of combining TBAB with kinetic promoters (SDS, nano Al₂O₃, L-methionine, L-leucine) on CO₂ hydrate generation characteristics was further investigated. In this paper, the effect of a single promoter on the generation characteristics of CO₂ hydrate was investigated, and the efficient carbon trapping ability of the complex promoter was verified, which provides theoretical support for the application of CO₂ trapping technology using the hydrate method. [ABSTRACT FROM AUTHOR]