MEA活化MDEA工艺天然气选择性脱硫脱碳研究

Selective removal of H2S over CO2 from natural gas by MEA-activated MDEA

为改善甲基二乙醇胺(MDEA)的天然气选择性脱硫脱碳性能,降低溶剂再生能耗,提出采用一乙醇胺(MEA)活化MDEA法进行天然气选择性脱硫脱碳,并采用Aspen HYSYS对工艺进行了模拟。结果表明:添加MEA加速了吸收剂的H2S、CO2吸收速度,提高了脱硫脱碳效率,H2S选择因子由55.5提高至96.6,贫液循环量下降,综合考虑吸收性能和再生能耗,以4%的MEA添加量为宜;MEA活化MDEA工艺可将再生能耗由3.54 GJ/t CO2显著降低至2.15GJ/t CO2。该工艺可显著活化传统MDEA工艺的选择性脱硫脱碳性能,并大幅降低溶剂的再生能耗,有广阔的应用前景。

A chemical absorption process using monoethanolamine(MEA)-activated methyl diethanolamine(MDEA) was proposed to achieve the selective removal of H2S over CO2 from natural gas and reduce energy consumption, and the process was simulated by Aspen HYSYS. The results show that the addition of MEA accelerates the absorption of H2S and CO2, improves the efficiency of desulfurization and decarbonization, enhances the selection factor of H2S from 55.5 to 96.6, and decreases the circulation of lean solution. Considering the absorption performance and regeneration energy consumption, it is appropriate to add 4%MEA. The regeneration energy consumption can be significantly reduced from 3.54 GJ/t CO2 to 2.15 GJ/t CO2 by adding MEA. This study provides a promising candidate for selective removal of H2S over CO2 from natural gas with high desulfurization and decarbonization efficiencies and low regeneration energy requirement.