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Published in Saeed Sahebdelfar, Maryam Takht Ravanchi, Ashok Kumar Nadda, 1 Chemistry, 2022
Saeed Sahebdelfar, Maryam Takht Ravanchi, Ashok Kumar Nadda
In the conventional carbon dioxide capture technologies based on chemical absorption, alkali absorbents, ammonia and aqueous amine/MEA are commonly used as solvents. For natural gas sweetening, MDEA (N-methyldiethanolamine) is used as a tertiary amine and for CO2 removal from hydrogen and natural gas, MEA is mainly used (Spigarelli and Kawatra, 2013).
Rapid quantification of degraded products from methyldiethnolamine solution using automated direct sample analysis mass spectrometry and their removal
Published in Chemical Engineering Communications, 2020
Priyabrata Pal, Abdul Fahim Arangadi, Anjali Achazhiyath Edathil, Vinu Pillai, Fawzi Banat
The natural gas sweetening unit in the Gulf region generally uses tertiary alkanolamine (methyldiethanolamine; MDEA) as an absorbent for selective removal of H2S/CO2 (Aliabad and Mirzaei, 2009). The organic degraded products, heat stable salts such as total organic acids and heavy metals are well-known contaminants in the acid gas removal unit. Accumulation of total contaminants deteriorates the solvent quality, weakens the absorption capacity and enhances foaming problems leading to huge loss of MDEA and also causes corrosion and fouling of the equipment (Thitakamol and Veawab, 2008; Alhseinat et al., 2014). Other researchers (Chakma and Miesen, 1988, 1997; Reza and Trejo, 2006; Bedell et al., 2011; Islam et al., 2011; Rochelle, 2012) including our previous work (Pal et al., 2015; Pal and Banat, 2016) identified several degraded products present in MDEA. Earlier, it was reported that DEA (a secondary alkanolamine) is one of the major organic degradation products in aqueous MDEA solution (Pal and Banat, 2016). An increase in the concentration of DEA would increase the absorption of CO2 resulting in an increased temperature of absorber due to the higher heat of absorption generated from reactions between DEA with CO2 (Zare and Mirzaei, 2009). Additionally, an increase in the DEA concentration is well known to enhance the corrosion rate (Dupart et al., 1993). Alhseinat et al. (2015) reported the foaming behavior in the presence of these degraded products on aqueous MDEA solution. Identification, as well as quantification of degradation products present in MDEA, is essential to overcome these issues.
Microbubbles intensification and mechanism of wet air oxidation process of MDEA-containing wastewater
Published in Environmental Technology, 2022
Jun Zhao, ZongJian Liu, Lin Zhang, Qun Cui, HaiYan Wang
N-methyldiethanolamine (MDEA) [1] is an absorbent for acid gases such as Claus tail gas, natural gas, oil field gas and coal gas. A large amount of MDEA-containing wastewater would be discharged because of self-degradation [2] as well as the overhaul and maintenance of absorption/desorption unit devices during the system operation process. MDEA has a strong irritating effect on the respiratory tract, eyes and skin of human body. The methyl group (-CH3) in the structure of MDEA has strong biological resistance and strong alkalinity (pH > 12), which cannot be directly degraded by biological treatment methods [3,4].