MDEA中 中 烃类杂质脱除实验及过滤系统优化.

Objective The application of amine method gas desulfurization process in a natural gas purification plant was prone to producing solution pollution, foaming, and other issues. The introduction of mechanical filtration and MDEA ion exchange purification and reactivation technology partly alleviated the problem of solution oxidation degradation pollution. However, mature application experience has not yet been formed for the removal of organic impurities that are prone to foaming in the solution, such as hydrocarbons and surfactants. In order to solve the problems of organic impurity pollution and frequent foaming of desulfurization amine solution in the middle and later stages of gas field development, experimental research was conducted on the removal technology of hydrocarbon impurities in amine solution. Methods The activated carbon adsorption experiments and foaming performance evaluation of amine solution were carried out, and the optimal activated carbon suitable for natural gas purification was selected. Results The results of filtration experiments and foaming experiments of activated carbon materials indicated that coconut shell activated carbon had a better adsorption effect. Coconut shell activated carbon with higher iodine value and smaller particles had a higher adsorption effect. However, too small particle size would bring secondary pollution to amine solution, resulting in increased risk of downstream pipeline blockage. According to the comparison of the turbidity of amine solution, oil removal rate and foaming experiment results before and after filtration, the coconut shell activated carbon with 30-40 mesh（380-550 μm） and iodine value of 1 142 mg/g was selected from the samples sent by the manufacturer as the filter material for removing hydrocarbon impurities from the amine solution for desulfurization of natural gas in gas field. Conclusions The coconut shell activated carbon with appropriate iodine value and strength was preferred as the activated carbon filter element material for natural gas desulfurization amine solution, and a mechanical filter was added downstream to further remove mechanical impurities and activated carbon powder in the solution and reduce the foaming frequency of solution pollution. After optimization and transformation, the device runs smoothly, and the foaming and liquid blocking conditions are significantly improved. [ABSTRACT FROM AUTHOR]