Desulfurization Selectivity and Regeneration Studies of Sterically Hindered Amines

doi:10.11885/j.issn.1674-5086.2016.03.23.03

Abstract

Abstract: A set of devices was designed and constructed for the desulfurization selectivity studies of sterically hindered amines. In the presence of CO₂, the changing patterns of the desulfurization selectivity and regeneration over time of three aqueous sterically hindered amines-TBE (tert-butylaminoethanol), TBDEE (tert-butylaminodiethoxyethanol), and AMP (2-amino-2-methyl-1-propanol)-were investigated. The results showed that the absorption rate of H₂S for all three sterically hindered amines was higher than that of CO₂ and the H₂S absorption rate and desulfurization selectivity initially increased but decreased over prolonged time periods. TBE showed the highest desulfurization selectivity, and its selectivity reached a maximal value of 34 at 22 min. Finally, the desorption regeneration of these amine solutions was carried out via heating reflux, and the effects of desorption duration on the regeneration capacity of amine solutions were studied. The results showed that the desulfurization selectivity of regenerated amine solutions was lower than that of fresh amine. AMP showed the highest regeneration capacity, for which 85% of the absorption rate for H₂S was retained even after 1 h of regeneration.

Key words: sterically hindered amines, H₂S, CO₂, desulfurization selectivity, regeneration

CLC Number:

TE644

LI Yuntao, LI Lulu, LI Hui, ZHANG Zhi, XU Jilei. Desulfurization Selectivity and Regeneration Studies of Sterically Hindered Amines[J]. 西南石油大学学报(自然科学版), 2017, 39(3): 173-179.

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