Method for preparing anhydrous oxalic acid from oxalic acid and production device using method
The invention relates to a method for preparing anhydrous oxalic acid from oxalic acid and a production method using the method. The method includes the steps of placing the oxalic acid in a closed container, heating, maintaining the temperature which rises to 50-60 DEG C for 55-65 minutes, continui...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The invention relates to a method for preparing anhydrous oxalic acid from oxalic acid and a production method using the method. The method includes the steps of placing the oxalic acid in a closed container, heating, maintaining the temperature which rises to 50-60 DEG C for 55-65 minutes, continuing heating, and maintaining the temperature which rises to 101-105 DEG C for 10-15 minutes. The production device comprises a hot air chamber (2) fixedly connected above a support (1). A drying chamber (5) is fixedly connected to the upper end of the hot air chamber. Inclined porous boards (9) are disposed in the drying chamber. A multi-orifice board (10) is disposed above the inclined porous boards. Filter bags (11) are connected to the multi-orifice board. The top end of the drying chamber is provided with an air outlet (4) above the multi-porous board. By the aid of the production device and the preparation method, drying of the anhydrous oxalic acid is more accurate and scientific, and the dried anhydrous oxali |
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