Purpose
This paper aims to study the effect of chloride ions concentration on the corrosion behavior of carbon steel in methyldiethanolamine (MDEA) aqueous solution in the sight of different process parameters of purification plant.
Design/methodology/approach
Due to the decrease of filtration efficiency and separation efficiency, the chloride ion in the desulfurization solution is enriched. The corrosion behavior of carbon steel under chloride ion enrichment environment was studied by weight-loss method, electrochemical impedance spectroscopy, cyclic polarization curve, X-ray photoelectron spectroscopy and scanning electron microscopy.
Findings
The results show that temperature and hydrogen sulfide loads are the main factors of corrosion in CO2-MDEA-H2O-H2S environment. The enrichment of chloride ions reduces the corrosion rate at low temperature but promotes the corrosion rate at high temperature. The chloride concentration should be controlled below 3000 mg/L, and no pitting corrosion was found under the experimental conditions.
Originality/value
The effect of chloride ion enrichment on MDEA solution corrosion shows that at low temperature, the increase of chloride ion will reduce the acid gas load and increase the density of corrosion products, so as to reduce the corrosion; on the contrary, at high temperature, the density of corrosion products will decrease and the corrosion will be intensified as well. It is believed that the chloride ion should be controlled below 3000 mg/L according to the results of the tests.
The insoluble elemental sulfur with particle size less than 10 μm is produced in the solution through chelated iron-based method, while the sulfur recovery is generally through the aggregation sedimentation filtration method. In this paper, the influence of desulfurization solution parameters on the size of sulfur are investigated, and the indispensable conditions for the formation of large-size sulfur are discussed. Meanwhile, in order to obtain the conditions for large sulfur particles generation, the influence of the concentration of sulfur modifier on the Zeta potential of desulfurization solution and the change of sulfur particle size were studied.
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