H2 solubility and mass transfer in anthraquinone working solution: Experimental and modeling study

This work was focused on the measurement of the solubility of hydrogen (H 2 ) in anthraquinone working solution at temperatures of 30.0–80.0   °C and pressures of 0.2–3.0   MPa by the method of experimental and COSMO-RS model study. The influence of various factors, i.e. , including pressure, temperature and solvent volume ratio, on H 2 solubility was investigated. According to the experimental results, H 2 solubility in anthraquinone working solution increases with the increase of pressure. At low pressures, the temperature had little effect on H 2 solubility while under high pressures H 2 solubility increases with increasing temperature. Henry's constant ln H has a good linear relationship with 1/ T (ln H   =   −   1319.1/ T   +   9.91). The effect of volume ratio of trioctyl phosphate to trimethylbenzene on the solubility of hydrogen was studied and the results showed that increasing the amount of trimethylbenzene was conducive to the dissolution of hydrogen. In addition, there is a linear relationship between ln(( P 0   −   P e )   /   ( P t   −   P e )) and the time t . Gas–liquid mass transfer coefficient was obtained by calculating the slope of the line.