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Carbon dioxide induced degradation of diethanolamine during absorption and desorption processes

Chinese Journal of Chemical Engineering 2018年第2期26卷 293-302页

作者： Md.Sakinul Islam kotaiah Naik Dhanavath Nhol kao pradipto k.bhattacharjee Brahim Si Ali Rozita Yusoff Department of Chemical Engineering School of EngineeringRMIT UniversityMelbourneVIC 3001Australia Department of Chemical Engineering Faculty of EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia

Alkanolamines are widely used in the purification of the sourgas sweetening process. During the sour gas absorption process, CO_2 significantly degrades the amine solvent and creates enormous problems for plant operation. In this work, CO_2 induced degradation of aqueous diethanolamine(DEA) solution was conducted in a 1.25 L jacketed glass reactor that functioned as an absorber and stripper at atmospheric conditions. Pure CO_2 was bubbled through the reactor until the solution became saturated. In this study, the concentrations of DEA used were in the range of concentrations between 2 mol·L^(-1) and 4 mol·L^(-1). In the degradation experiment, six generic cycles were conducted for each run. Each cycle was configured with the absorption and desorption of carbon dioxide at 55 ℃ and 100 ℃, respectively. Samples were collected after a predetermined experimental time and analyzed by ion chromatography(IC) to identify unknown ionic degradation products(DGPs). In the IC analysis, three different columns were used for anion, cation and ion exclusion systems, which are Metrosep A Supp 5150/4.0, Metrosep C Supp 4 150/4.0 and Metrosep Organic Acids, respectively. The major identified DGPs of D01 DEA2 M, D02 DEA3 M, and D03 DEA4 M are nitrite, acetate and ammonium. Phosphate product was found in the degraded amine samples which might be due to the contamination of water or chromatographic system.

关键词： Degradation Diethanolamine Absorption Stripping Gas sweetening process

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Dzyaloshinskii–Moriya interaction in noncentrosymmetric superlattices

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npj Computational Materials 2021年第1期7卷 1164-1170页

作者： Woo Seung Ham Abdul-Muizz pradipto kay Yakushiji kwangsu kim Sonny H.Rhim kohji Nakamura Yoichi Shiota Sanghoon kim Teruo Ono Institute for Chemical Research Kyoto UniversityUjiKyotoJapan Department of Physics Engineering Mie UniversityTsuMieJapan Faculty of Mathematics and Natural Sciences Institut Teknologi BandungBandungIndonesia National Institute of Advanced Industrial Science and Technology(AIST) TsukubaIbarakiJapan Department of Physics University of UlsanUlsanSouth Korea

Dzyaloshinskii–Moriya interaction(DMI)is considered as one of the most important energies for specific chiral textures such as magnetic *** keys of generating DMI are the absence of structural inversion symmetry and exchange energy with spin–orbit ***,a vast majority of research activities about DMI are mainly limited to heavy metal/ferromagnet bilayer systems,only focusing on their ***,we report an asymmetric band formation in a superlattices(SL)which arises from inversion symmetry breaking in stacking order of atomic layers,implying the role of bulk-like *** bulk DMI is more than 300%larger than simple sum of interfacial ***,the asymmetric band is largely affected by strong spin–orbit coupling,showing crucial role of a heavy metal even in the non-interfacial origin of *** work provides more degrees of freedom to design chiral magnets for spintronics applications.

关键词： interaction symmetry chiral

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