Catalytic Solvent Regeneration Using Hot Water During Amine Based CO2 Capture Process
Catalytic Solvent Regeneration Using Hot Water During Amine Based CO2 Capture Process
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DOI：
10.1016/j.egypro.2014.11.028
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Huancong Shi;R. Idem;A. Naami;D. Gelowitz;P. Tontiwachwuthikul
中科院分区：
文献类型：
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作者：
Huancong Shi;R. Idem;A. Naami;D. Gelowitz;P. Tontiwachwuthikul
在90-95 ℃下，使用单一和混合胺（即MEA、MEA-MDEA、MEA-DEAB（4-（二乙胺）-2-丁醇）），在有和没有固体酸催化剂（γ-Al_2 O_3或HZSM-5）的情况下进行CO_2汽提/胺再生实验。将在没有催化剂的情况下再生5 M MEA的热负荷取为100%并作为基线。结果表明，在最低热负荷方面的胺再生性能遵循以下顺序：具有HZSM-5的MEA-DEAB（38%）>具有γ-Al 2 O3的MEA-DEAB（40%）>无催化剂的MEA-DEAB（51%）>具有HZSM-5的MEA（65%）>具有γ-Al 2 O3的MEA（73%）>具有γ-Al 2 O3/无催化剂的MEA-MDEA（74%），所有这些都相对于没有催化剂的MEA（100%）。结果进一步表明，在混合溶剂中加入MDEA或DEAB（作为叔胺）提供了R3 N和HCO −，它们分裂，从而降低了溶剂再生途径中的自由能隙。这意味着，与固体酸催化剂一起使用的混合胺可能会导致汽提塔的尺寸和热负荷在溶剂再生过程中减少。
Experiments for CO2stripping/amine regeneration were performed using single and blended amines (namely, MEA, MEA– MDEA, MEA–DEAB (4-(diethylamine)-2-butanol)) with and without solid acid catalysts (γ-Al2O3or HZSM-5) at 90–95∘C. The heat duty to regenerate 5 M MEA without catalyst was taken as 100% and as the base line. The results showed that the amine regeneration performance in terms of lowest heat duty followed the order: MEA–DEAB with HZSM-5 (38%) > MEA–DEAB with γ-Al2O3(40%) > MEA–DEAB with no catalyst (51%) > MEA with HZSM-5 (65%) > MEA with γ-Al2O3(73%) > MEA– MDEA with γ-Al2O3/no catalyst (74%), all relative to MEA with no catalyst (100%). The results further showed that the addition of MDEA or DEAB (as tertiary amines) in a blended solvent provided R3N and HCO −, which split and thus decreased the free energy gaps in the solvent regeneration pathway. The implication is that the use of blended amines in conjunction with solid acid catalysts could result in stripper size and heat duty reductions during solvent regeneration.