Using mixed tertiary amines for gas sweetening energy requirement reduction

Wael A. Fouad, Abdallah S. Berrouk

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44 Scopus citations


Studies have demonstrated the positive impact of mixing primary/tertiary or secondary/tertiary amines on the efficiency of amines sweetening processes in terms of gas purification and/or the process energy requirements. This paper discusses the use of amine solvents that consist of two tertiary amines namely methyl-diethanolamine (MDEA) and tri-ethanolamine (TEA). A kinetic approach was used to explain results obtained from process simulation of Habshan gas sweetening unit in Abu Dhabi, UAE. Results show that up to 3.0% reduction in the unit running cost can be obtained using the mixture (40% wt. MDEA + 5% wt. TEA) while meeting the sweet gas specifications in terms of H2S and CO2 concentrations. The lean amine loading was fixed at a value of 0.005. Results for the (40% wt. MDEA + 5% wt. TEA) mixture were compared to the results of the standardized (45% wt. MDEA) solvent used in Habshan and other possible primary/tertiary and secondary/tertiary amine mixtures. This reduction in cost was achieved through a decrease in the plant raw materials cost and in both regenerator reboiler and trim cooler energy requirements.

Original languageBritish English
Pages (from-to)12-17
Number of pages6
JournalJournal of Natural Gas Science and Engineering
StatePublished - Mar 2013


  • Amine
  • Gas sweetening
  • Kinetics
  • MDEA
  • TEA


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