## 3 Results and Discussion
### Alcohols  
Changes in concentration of alcohol vapours in all the tested cases had the nature of an expotential fading (Figure 5).  
\begin{table}
\begin{tabular}{c c c c} \hline \(c_{\mathbf{o}}\) & \(q\) & \(k_{p}\) & \(t_{1/2}\) \\ \hline
**Ppm** & \(\mathbf{dm^{3}\ h^{-1}}\) & \(\mathbf{s^{-1}}\) & \(\mathbf{S}\) \\ \hline
4950 & 95 & 0.0413 & 16.78 \\
2860 & 95 & 0.0521 & 13.29 \\
550 & 95 & 0.0549 & 12.62 \\
147 & 72 & 0.0467 & 14.84 \\
156 & 62 & 0.0383 & 18.11 \\
144 & 45 & 0.0290 & 23.88 \\
152 & 35 & 0.0220 & 31.51 \\ \hline \end{tabular}
\end{table}
Table 1: Values of apparent constant rates of the absorption process \(k_{p}\) and times of half-time reduction of ammonia concentration \(t_{1/2}\). \(c_{0}\)—initial concentration of ammonia in chamber.  
Figure 4: Dependence curves of the ammonia concentration logarithm in the time function for water flow efficiency of the curtain equalling to: (1) \(q\) = 35 dm\({}^{3}\) h\({}^{-1}\), (2) \(q\) = 45 dm\({}^{3}\) h\({}^{-1}\), (3) \(q\) = 62 dm\({}^{3}\) h\({}^{-1}\), and (4) \(q\) = 72 dm\({}^{3}\) h\({}^{-1}\). Insert: curve of dependence of the time of half-life reduction of ammonia concentration in the function of water flow efficiency of the curtain.  
A similar exponential nature of concentration dependence curves in the function of time was recorded for ammonia. Regarding primary alcohols in the initial part of the course, a period of constant level of vapour concentration has been recorded (minute 1-3). This is due to the time needed for lifting and mixing of alcohol vapours that are heavier than air. It is a period in which a reduction in alcohol vapour concentration through the curtain is compensated for by enforced diffusion of such vapour towards upper parts of the chamber. After equalisation of vapour concentration in the whole system, there is a reduction of concentration as a result of sorption-based action of water.  
It is clear that the rate of absorption of vapours of studied alcohols tends to decrease with the increase in the length of the hydrocarbon chain (Table 2, Figure 6).  
\begin{table}
\begin{tabular}{c c c c} \hline  & \(q\) & \(k_{p}\) & \(t_{1/2}\) \\ \cline{2-4}  & \(\mathbf{dm^{3}\ h^{-1}}\) & \(\mathbf{s^{-1}}\) & \(\mathbf{s}\) \\ \hline Methanol & 35 & 0.00506 & 137 \\ Ethanol & 35 & 0.00163 & 425 \\
1-propanol & 35 & 0.00132 & 523 \\
1-butanol & 35 & 0.00089 & 782 \\ \hline \end{tabular}
\end{table}
Table 2: Kinetic parameters of water curtain for different water efficiencies of investigated alcohols: \(k_{p}\)—apparent sorption rate constant, \(t_{1/2}\)—half-life decay value (kinetic range).  
Figure 5: Concentration time dependent curves in time of water curtain work for vapours (**A**) methanol, (**B**) ethanol, (**C**) 1-propanol, and (**D**) 1-butanol. Water flow efficiency \(q=35\) dm\({}^{3}\) h\({}^{-1}\).  
This is manifested by linear growth of the time of half-life reduction in alcohol vapour concentration in the function of the number of coal atoms in the aliphatic chain (Figure 7). The correlation coefficient R\({}^{2}\) for this matching amounts to 0.97. This dependence is described by the equation \(t_{1/2}\) = 203.3N \(-\) 41.5.  
No significant effect of water temperature on the kinetics in the range 283 K \(\leq T\leq\) 295 K was observed.