Greenhouse gas treatment is urgently needed because of the impact of climate change caused by greenhouse gas emissions after global economic growth. In this study, postcombustion capture was carried out to screen absorbents for simultaneous absorption and regeneration of CO₂ and H₂S byproducts of biogas using N-methyldiethanolamine (MDEA)-based additives. Twelve different absorbents were selected and compared according to the types of the amine group and the alcohol group. The mixture gas of 35 vol % CH₄, 15 vol % CO₂, and 50 ppm H₂S balanced by N₂ was used for absorption and regeneration. Absorption and regeneration were carried out at 35 and 80 °C, respectively. The absorbent concentration was fixed at 4.5 wt % for MDEA and 0.5 wt % for additives. In the continuous absorption and regeneration experiments, rich loading, lean loading, cyclic loading, absorption rate, and desorption rate were measured according to the loading values of CO₂ and H₂S using MDEA/additive mixed absorbent. CO₂-rich loading was excellent in MDEA/diethylenetriamine (DETA), and CO₂ cyclic capacity was excellent in MDEA/bis(3-aminopropyl)amine (APA). H₂S-rich loading was superior in MDEA/APA, and H₂S cyclic capacity was superior in MDEA/DETA. The CO₂ absorption and regeneration rates were excellent in MDEA/piperazine (PZ), and the H₂S absorption and regeneration rates were excellent in MDEA/2-amino-2-methyl-1-propanol. MDEA-based blending absorbent showed better absorption and regeneration performance than MDEA, and MDEA/PZ showed good performance for CO₂ but very poor performance for H₂S. It was confirmed that MDEA/APA was superior for gas composition in the simultaneous absorption and regeneration of CO₂ and H₂S.

中文翻译：

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掺胺吸收剂同时去除沼气中CO ₂和H ₂ S的性能比较研究

由于全球经济增长后温室气体排放引起的气候变化影响，迫切需要温室气体处理。在这项研究中，使用基于N-甲基二乙醇胺（MDEA）的添加剂进行燃烧后捕集以筛选吸收剂，以同时吸收和再生沼气中的CO ₂和H ₂ S副产物。根据胺基和醇基的类型选择了十二种不同的吸收剂并进行了比较。35体积％的CH的混合气体₄，15体积％的CO ₂，和50ppmħ ₂由N s个平衡₂用于吸收和再生。吸收和再生分别在35和80℃下进行。对于MDEA，吸收剂浓度固定为4.5重量％，对于添加剂，固定为0.5重量％。在连续吸收和再生实验中，使用MDEA /添加剂混合吸收剂，根据CO ₂和H ₂ S的负荷值，测定了富负荷，稀负荷，循环负荷，吸收率和解吸率。CO ₂富装载有优良的MDEA /二亚乙基三胺（DETA），和CO ₂循环的容量在MDEA是优异的/双（3-氨基丙基）胺（APA）。在MDEA / APA中，富含H ₂ S的负载更好，而在MDEA / DETA中，H ₂ S循环容量则更好。一氧化碳_2分吸收和再生率MDEA /哌嗪（PZ）优异，和H ₂的吸收和再生率MDEA是优秀/ 2-氨基-2-甲基-1-丙醇。MDEA基混合吸收剂比MDEA表现出更好的吸收和再生性能，MDEA / PZ对CO ₂表现出良好的性能，但对H ₂ S表现却很差。证实了MDEA / APA的气体组成在同时吸收和吸收方面均优于CO ₂和H ₂ S的再生。