New Technique Integrating Hydrate-Based Gas Separation and Chemical Absorption for the Sweetening of Natural Gas with High H₂S and CO₂ Contents

Abstract

Given the drawbacks of the traditional MDEA absorption process, we introduced a hydrate-based gas separation approach. Then, to study the effectiveness of this method, we performed some hydrating experiments demonstrating that energy consumption could be remarkably reduced. However, the acid components (H 2 S and CO 2 ) in the product gas failed to meet the specification requirements of the sales gas. Consequently, a new technique was developed that integrated hydrate-based gas separation and chemical absorption for the sweetening of natural gas with high H 2 S and CO 2 contents. To evaluate the performance of this new integrated method, technical comparisons based on simulation and experimental data were conducted. The results showed that the new integrated method could effectively remove sour components, which resulted in the product gas being able to meet the sales gas specifications. Additionally, the integrated technique consumed much less energy than the traditional MDEA absorption process and its amine regeneration duty was only 42% that of the MDEA method. What is more, upon an economical evaluation being performed, it was shown that the integrated technique tremendously reduced the investment and operating cost.

Estimation of Thermodynamic Stability of Methane and Carbon Dioxide Hydrates in the Presence of Hydrogen Sulfide

“…This phenomenon is called the pseudoretrograde phenomenon. The pseudoretrograde phenomena will occur in any pseudobinary system where sI and sII formers with low vapor pressures are present. − In the ternary system of CO 2 + H 2 S + H 2 O, it is believed that sII hydrate will be formed. However, it should be noted that carbon dioxide also acts as an inhibitor to sII hydrate formation due to competition with H 2 S to occupy the large cages in the structure.…”

Review on CO2 Management: From CO2 Sources, Capture, and Conversion to Future Perspectives of Gas-Phase Electrochemical Conversion and Utilization

“…This is a low-cost and environmentally friendly CO 2 separation technique, but it has not been developed like other methods . However, this method could be integrated with other methods, such as chemical absorption, to compensate for the low efficiency of CO 2 capture. , …”

Abatement of Greenhouse Gas Emissions from Ventilation Air Methane (VAM) Using Ionic Liquids: A Review of Experimental Methods and Modelling Approaches

“…Nonetheless, some challenges are considerable in this approach, such as performance in streams with high flow rates of VAM and the existence of contaminants and coal dust in the inlet gas stream [7,11,12]. While it is true that the presence of other compounds could complicate the process of methane uptake using clathrate hydrates, several promoters have been studied to increase the selectivity towards methane separation [13][14][15].…”