## 3 Results and Discussion
### Acetone  
Examples of dependence curves of acetone vapour concentration at a constant water flow efficiency (\(q\) = 25 dm\({}^{3}\) h\({}^{-1}\)) were presented on Figure 8. Similarly to the case of primary alcohols, in the initial stage of water jet administration, a period of a constant level of acetone vapour concentration was recorded. Yet, this period was relatively short and regardless of vapour concentration did not last longer than one minute. Similarly to primary alcohols and ammonia, a change in acetone concentration in the research chamber in all the analysed cases was found to be of a nature similar to exponential fading. This confirms the legitimacy of approximation of the reduction process of acetone vapour concentration in the function of time by Equation (1), which is similar to the equation of reaction of pseudo first order. In order to assess the maximum reduction rate of acetone vapour concentration  
Figure 6: Kinetic curves of sorption by water curtain for vapours of (1) methanol, (2) ethanol, (3) 1-propanol, and (4) 1-butanol. Water flow efficiency \(q\) = 35 dm\({}^{3}\) h\({}^{-1}\).  
Figure 7: Dependence of half-life concentration reduction time t\({}_{1/2}\) on the number of coal atoms in the aliphatic chain of tested alcohols. Water flow efficiency \(q\) = 35 dm\({}^{3}\) h\({}^{-1}\).  
in the chamber, an analytical range was adopted between the first and the fifth minute, as has been presented as a logarithm of concentration in the function of time on Figure 9.  
The average value of \(k_{p}\) with accuracy up to one standard deviation amounts to \(k_{p}=(4.04+/-0.17)\)\(\times\)\(10^{-3}\) s\({}^{-1}\) (Table 1). The variability coefficient equals to 4.2% and implies an insignificant dispersion of recorded values of apparent constant absorption rate \(k_{p}\).  
Studies of the impact exerted by effectiveness of water curtain on the absorption rate of acetone vapour were carried out for q equalling to 25, 35, 43, and 57 dm\({}^{3}\)/h. According to expectations, an increase was recorded of the apparent value of constant absorption rate \(k_{p}\) and the linear dependence of half-life reduction time of acetone concentration t\({}_{1/2}\) in the function of inverse of water efficiency of the curtain (Figures 10 and 11, Table 3). The latter dependence may be described in the scope studied by equation \(t_{1/2}=2274q^{-1}+85.3\) with correlation equalling to R\({}^{2}=0.977\).  
Figure 8: Curves of dependence of acetone concentration in time function during administration of water jets from a water curtain with a nozzle diameter of \(\Phi=1\) mm. Initial concentration of acetone (1) 2012 ppm, (2) 1724 ppm, (3) 1249 ppm, (4) 914 ppm, and (5) 608 ppm. Water flow efficiency \(q=25\) dm\({}^{3}\) h\({}^{-1}\).  
Figure 9: Dependence curves of acetone concentration logarithm in the function of time. The analysed kinetic range between 60 s \(\leq t\leq\) 300 s. Initial acetone concentration in the chamber (1) 2012 ppm, (2) 1724 ppm, (3) 1249 ppm, (4) 914 ppm, and (5) 608 ppm. Water flow efficiency \(q=25\) dm\({}^{3}\) h\({}^{-1}\).  
No significant effect of water temperature on the kinetics in the range 283 K \(\leq T\leq\) 295 K was observed.