Anhydrous hydrofluoric acid production process and storage packaging requirements
Anhydrous hydrofluoric acid has high chemical activity, strong water absorption, and generates intense heat when dissolved in water. Therefore, storage and packaging of anhydrous hydrofluoric acid is very important. The following is the production process and storage and packaging requirements of anhydrous hydrofluoric acid. I hope it will be helpful to everyone.
Production process of anhydrous hydrofluoric acid
The specific production process is as follows: the fluorite powder preheated and dried by steam is sent to the fluorite storage bin with a bucket elevator, and the fluorite powder in the bin is measured and sent to the rotary reaction furnace by a high-speed screw conveyor.
The fuming sulfuric acid and the sulfuric acid which has absorbed the HF in the exhaust gas in the acid absorption tower are sent to a mixed acid tank, where they are mixed with the dilute acid from the washing tower. The mixed acid enters the rotary reactor. The rotary reaction furnace is heated by a gas generator, and the flue gas is indirectly heated through the jacket to meet the heat required for the reaction. In the rotary reaction furnace, the jacket temperature is 450 degrees Celsius and the temperature of the material is 150 degrees Celsius. The slag discharged from the tail of the reaction furnace is neutralized with slag and excess acid, and then sent to the slag storage hopper through the slag elevator. The gas product of the reaction is mainly hydrogen fluoride. This gas first enters the washing tower for dust removal and cooling. The temperature of the gas before entering the washing tower is about 3500C, and the temperature after washing is 150. The washing liquid is sulfuric acid. At this time, a small amount of water in the gas It is still mixed with H1 gas in the state of water vapor, and then enters the primary cooler, HF. Stage condenser and HF Bu stage condenser in turn.
Requirements for anhydrous hydrofluoric acid storage packaging
Anhydrous hydrofluoric acid is stored in a steel tank designed with a jacket. The jacket is passed through -10 ° C brine to keep it at a lower temperature and prevent the anhydrous hydrofluoric acid from gasifying. Generally, the temperature of anhydrous hydrofluoric acid in the storage tank is not higher than 5 ° C; the storage tank is also required to withstand a certain pressure, and a vent pipe connected to the rectification tower or degassing tower is provided to prevent the HF gas from being vented and It is recovered, and at the same time, a large pressure in the tank can be avoided. The filling factor of the anhydrous hydrofluoric acid storage tank shall not exceed 90% of the total volume of the tank.
Anhydrous hydrofluoric acid is packed in a special steel bottle. The steel bottle is required to withstand a pressure of 196 × 104Pa, and is regularly inspected according to national regulations. Because the cylinder containing anhydrous hydrofluoric acid is in the process of use, because anhydrous hydrofluoric acid absorbs water, it will inevitably inhale part of the water into the bottle, causing the cylinder to corrode. Therefore, the cylinder containing anhydrous hydrofluoric acid should be cleaned every time it is used to ensure safety.
The above is an introduction to the production process and storage packaging requirements of anhydrous hydrofluoric acid. I hope everyone will understand the production process and storage packaging requirements of anhydrous hydrofluoric acid, which will be helpful to everyone.
