Table 1: Adsorption data of nimesulide on silica aerogel at different values of the CO2/EtOH weight ratio ( ). is the mass fraction of nimesulide in the solution, time is the duration of the experiment until bed saturation is reached, and Eff is the efficiency of adsorption.

Loading, %TimeEff, %

7.20.880.0000470.489492.6
3.40.780.0008561.07593.3
1.50.610.00152.85096.1
0.90.480.001975.46092.3
0.60.380.002458.93794.8