Patent ID: 6840968
Filing Date: 2005-01-11
Classification: B01D

Abstract:
1. A method for purification through sublimation by compressing a powdered object of purification to a tight and compact manner for containing a greater amount of substances evenly in a unit volume so that the object of purification has an improved heat transfer efficiency, the method comprising steps of: a. compressing powders of the object to be purified in a tight and compact manner under a preset pressure, temperature and time; b. placing the compressed object to be purified on a carrying device located in a sublimation section of a purification apparatus; c. discharging an inertia gas from an inertia gas apparatus into the purification apparatus through a gas inlet and discharging air from the purification apparatus through a gas discharge outlet so that the inertia gas replaces the air originally contained in the purification apparatus; d. vacuumizing the purification apparatus by a vacuum system through the gas discharge outlet to lower the pressure of the interior of the purification apparatus to 0.1 torr; e. heating the sublimation section of the purification apparatus through a heater located outside the purification apparatus corresponding to the sublimation section to sublimate the object to be purified; and f. collecting purified substances deposited on collecting sections of the purification apparatus.