Mechanism Analysis of Desorption Enhancement by Utrasonic Field
Guo Ping-sheng · Journal of Chemical Engineering of Chinese Universities · 2002
Assuming fixed region adsorption, an adsorption equilibrium equation was deduced based on the energy and statistical thermodynainics when outer field was applied. The mechanism of desorption enhancement by ultrasonic was discussed. The results indicated that the reduction in adsorption isotherm or the enhancement of desorption under ultrasonic field is caused by the Mohaupt effect of ultrasonic wave which makes the adsorption phase molecules has higher energy-capture capability and causes it have higher energy than the molecules in reference state. This is the intrinsic reason for the enhancement of desorption. The results based on theoretic prediction are in accord with that of experimental data. The theoretic results also indicate that the effect of ultrasonic field on the desorption will be obvious as long as the molecules in the adsorption phase acquire energy as much as kT or higher; and there is a synergism action of ultrasonic field and the temperature field in the process of enhanced desorption.