Preparation of Fine Ammonium Perchlorate by Employing Dual-Sonic Premixer: Freeze-Drying Method

Ammonium perchlorate (AP)-based composite propellant is the most widely used solid propellant. Fine AP is required to obtain a propellant with a high burning rate. To prepare fine AP, an emulsion was prepared by emulsifying toluene and the AP solution. The emulsion was frozen rapidly with liquid nitrogen and then freeze-dried. Fine AP was prepared by this freeze-drying method. In this study, the emulsion was prepared with the premixer adopted dual-sonic technology and an attempt was made to prepare finer AP. By using a dual-sonic premixer, the emulsion was efficiently prepared, and therefore, a fine AP sample was obtained, compared with the homogenizer that is commonly used. It was found that the AP sample could be used as a propellant oxidizer according to its impact and thermal sensitivities.