Performance of CO2 removal from biogas by using amine-based amino acid salts blended absorbents

doi:10.16085/j.issn.1000-6613.2015.03.041

Abstract

Abstract: This paper investigated the CO₂ absorption performance from biogas and regeneration characteristics using N-methyldiethanolamine-based(MDEA)blended solvents respectively promoted by monoethanolamine(MEA), MEA-based glycinate(MEAGLY) and MEA-based sarcosinate(MEASAR)in a bubbling CO₂ absorption/regeneration reactor. Results showed that the CO₂ absorption rates of blended solvents increased with the adding amount of promoters, but CO₂ desorption rates decreased. During the period of temperature increase from the absorption range to regeneration range, all the CO₂-rich solvents were regenerated, and the blended solvents performed better than the single solvents in CO₂ regeneration efficiency. In addition, when mass ratio of MDEA to promoter was 3:2 in the blended solvents, the absorption-regeneration performances were optimal. CO₂ removal costs from biogas of different absorbents were also assessed and compared. Compared to the single MEA with 30% mass fraction, the blended solvents, MDEA/MEAGLY and MDEA/MEA in which the total mass fraction was 30% and the ratio of MDEA to MEAGLY or MEA was 3:2 had the lower CO₂ removal costs by about 12% and 30%, respectively. So MDEA/MEAGLY and MDEA/MEA might be the promising alternatives to replace MEA in the future.

Key words: biogas upgrading, amine based amino acid salt, blended solvent, absorption, CO₂ regeneration

摘要： 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3:2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(3:2)和MDEA/MEA(3:2)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。

关键词: 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

CLC Number:

S216.4

HE Qingyao, CAI Kai, YAN Shuiping, AI Ping, WANG Yuanyuan, ZHANG Yanlin. Performance of CO₂ removal from biogas by using amine-based amino acid salts blended absorbents[J]. Chemical Industry and Engineering Progree, 2015, 34(3): 857-862.

贺清尧, 蔡凯, 晏水平, 艾平, 王媛媛, 张衍林. 有机胺基氨基酸盐混合吸收剂对沼气中CO₂的分离特性[J]. 化工进展, 2015, 34(3): 857-862.

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Performance of CO₂ removal from biogas by using amine-based amino acid salts blended absorbents

有机胺基氨基酸盐混合吸收剂对沼气中CO₂的分离特性

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