No abstract

Hollow fiber membrane contactors (HFMCs) provide a large specific surface area. Thus, their significantly reduced volume provides an advantage compared to the conventional gas–liquid contactor. In this study, the selective removal efficiency of flue gas, in which sulfur oxide (SO2) and carbon dioxide (CO2) coexist, was measured using a polypropylene (PP) HFMC with such advantages. To increase the selective removal efficiency of SO2, experiments were conducted using various alkaline absorbents. As a result, with 0.05 M ammonia solution, the removal efficiency of 95% or more was exhibited with continuous operation for 100 h or more. We confirmed that the absorbent saturated by the once-through mode was aqueous ammonium sulfate ((NH4)2SO4) solution and could be used as a fertilizer without additional processing.

2-(Isopropylamino)ethanol (IPAE) is attracting attention as an efficient amine-based CO2 absorbent with steric hindrance. However, data on the physicochemical characteristics of IPAE are lacking. Therefore, in this study, the physical properties of aqueous IPAE solutions, such as density, dynamic viscosity, surface tension, vapor pressure, heat capacity, and thermal conductivity, were measured from T = (298.15 to 353.15) K for IPAE mass fractions of 0.1–0.5. For each physical property, correlation coefficients based on the temperature and mass fraction were derived through regression analysis, and the absolute average deviation between the measured and calculated data was found to be 0.146% for density, 0.706% for dynamic viscosity, 0.689% for surface tension, 0.164% for vapor pressure, 0.343% for heat capacity, and 0.269% for conductivity. The reported data are anticipated to be highly valuable as process design data for researchers who use IPAE as an absorbent.