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- Title
Removal of heat stable salts from N-methyldiethanolamine wastewater using electrodialysis: a pilot-scale study.
- Authors
Fuqiang Chen; Yongzhi Chi; Mengyi Zhang; Kun Yang; Cuilian Fu
- Abstract
Heat stable salts (HSS) are well-known degradation products of gas desulfurization using N-methyldiethanolamine (MDEA) solvents. Their formation in MDEA solution causes significant problems in gas processing industrial systems. In this study, a pilot-scale electrodialysis (ED) stack was assembled for the removal of the HSS from spent MDEA solution. Results show that the optimum voltage and dilute MDEA solution flow rate were determined of 80 V and 4 m3/h based on the HSS removal efficiency and the loss of MDEA during continuous operation. During batch experiments, the effect of initial pH in the spent MDEA solution was investigated. By adding NaOH to adjust the initial pH = 10.5 of the MDEA solution, the HSS removal efficiency is 77%, which is 26.09% higher than that without NaOH addition, the loss of MDEA is 5.73%, which is 12.65% lower than that without NaOH addition. The total process cost of ED method is calculated to be 748.68 $/(T HSS).
- Subjects
ELECTRODIALYSIS; MANUFACTURING processes; HEAT; SALT; INDUSTRIAL gases; PH effect
- Publication
Desalination & Water Treatment, 2020, Vol 196, p48
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2020.25935