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Title: Application of NF Polymeric Membranes for Removal of Multicomponent Heat-Stable Salts (HSS) Ions from Methyl Diethanolamine (MDEA) Solutions
Authors: Ghorbani, Asma
Bayati, Behrouz
Poerio, Teresa
Argurio, Pietro
Kikhavani, Tavan
Namdari, Marzieh
Ferreira, Licínio M. 
Keywords: amine purification; negative surface membrane; heat stable salts removal; amine rejection; nanofiltration membrane
Issue Date: 2020
Publisher: MDPI
Project: Ilam Gas refinery within the framework of the Project “Nanofiltration and electrodialysis membrane unit design to remove amine impurities in the circulation of Ilam gas refinery” Grant no. 315232. 
Serial title, monograph or event: Molecules
Volume: 25
Issue: 21
Abstract: This study presents an e cient and scalable process for removing the heat-stable salts (HSS) ions from amine solution while recovering methyl diethanolamine (MDEA) solution for its reuse in gas sweetening plants. The presence of HSS in the amine solution causes the loss of solvent capacity, foaming, fouling, and corrosion in gas sweetening units so their removal is crucial for a more well-performing process. Furthermore, the recovery of the amine solution can make the sweetening step a more sustainable process. In this study, for the first time, the removal of a multicomponent mixture of HSS from MDEA solution was investigated via a nanofiltration process using flat-sheet NF-3 membranes. The impact of operating parameters on salts and amine rejection, and flux, including the operating pressure, HSS ions concentration, and MDEA concentration in the feed solution was investigated. Results based on the nanofiltration of an amine stream with the same composition (45 wt.% MDEA solution) as that circulating in a local gas refinery (Ilam Gas refinery), demonstrated a removal e ciency of HSS ions in the range from 75 to 80% and a MDEA rejection of 0% indicating the possibility of reusing this stream in the new step of gas sweetening.
ISSN: 1420-3049
DOI: 10.3390/molecules25214911
Rights: openAccess
Appears in Collections:FCTUC Eng.Química - Artigos em Revistas Internacionais

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