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化工进展  2015 

有机胺基氨基酸盐混合吸收剂对沼气中CO2的分离特性

DOI: 10.16085/j.issn.1000-6613.2015.03.041, PP. 857-862

Keywords: 沼气提纯,有机胺基氨基酸盐,混合吸收剂,吸收,二氧化碳再生

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Abstract:

在鼓泡式CO2吸收和再生装置中,研究了N-甲基二乙醇胺(MDEA)/乙醇胺(MEA)、MDEA/乙醇胺基甘氨酸(MEAGLY)和MDEA/乙醇胺基肌氨酸(MEASAR)混合吸收剂的沼气CO2吸收及再生特性。结果表明混合吸收剂的沼气CO2吸收速率随MEA、MEAGLY和MEASAR等添加剂添加量的增加而提高,但再生速率却呈现下降趋势。再生过程中,吸收剂在升温阶段均发生了CO2再生,且混合吸收剂再生效果要优于单一吸收剂。综合考虑CO2吸收速率、再生速率和CO2循环携带量,MDEA与活化剂质量配比为32时所组成的混合吸收剂的沼气CO2吸收-再生综合性能最优。沼气CO2分离成本对比分析显示,与质量分数为30%的MEA相比,总质量分数为30%的MDEA/MEAGLY(32)和MDEA/MEA(32)的CO2分离成本可分别下降约12%和30%,在未来具有替代MEA进行工程应用的潜能。

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