Abstract
The degradation of amine solvents leads to increasing costs and deterioration in long term performance. Therefore, the purification of the solvents is needed to guarantee smoother operations. In this research, the flotation setup was investigated by means of laboratory and pilot‐scale experiments in the amine reclamation for chloride and N, N′‐bis (2‐hydroxyethyl) piperazine (BHEP) separation. The maximum removal efficiency recorded was 51% for the largest chloride concentration of 7091 mg/l and 37% for the lowest chloride concentration of 1536 mg/l. The mass transfer coefficient was hence correlated with the hydrodynamic parameters, including chloride reduction rate, bubble surface area, and gas and liquid phase concentration. The average chloride removal efficiency for the monoethanolamine (MEA) was more than 61% due to a better dispersion of pure nitrogen gas bubbles and formation of the tiny bubbles provided in the column. The results indicated that a higher chloride initial concentration corresponded to better performance of the setup. Under the typical column operating conditions, it was concluded that a collection zone H:D of 10:1 was a reasonable compromise. The flotation setup results in BHEP separation, known as amine degradation product showed about 24% average amine recovery.
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