How to maintain a constant pressure inside the reactor
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Recently, I encountered a process in which nitrogen is introduced into the reaction vessel to maintain the pressure inside at around 0.8 kilograms, with the aim of preventing oxygen from entering the vessel； However, as more reaction material continues to be added, the pressure inside the tank increases, and it is necessary to release some of this pressure to keep it at around 0.8 kilograms. The material inside the tank is highly acidic, which places high demands on the corrosion resistance of the pressure control components. I wonder if there are any experts on the forum with experience in system design in this area. I hope you can give me some guidance. QQ: 3979394
Simple systems can be solved using a self-acting control valve air supply system in combination with a one-way valve on the reaction vessel. As for the material, just knowing it’s a strong acid isn’t enough for us. It is also necessary to know what specific strong acid it is and what the temperature is. As long as these conditions are met, a suitable material can definitely be found.
Hydrochloric acid gas is generated in the kettle, at a temperature of 60°
This is a nitrogen sealing device, available as a complete set for purchase
It’s better to use proportional control: add air when the pressure is below the set value, and release air when it’s too high.
In engineering, cascade control is commonly used: two control valves are employed, and when the system pressure is low, the make-up air valve comes into action to supply pressure to the system； When the system pressure is high, the exhaust valve comes into action to release excess gas ； It should be noted here that only one valve is used for filling or exhausting air ； If the poster is in a laboratory, they can install a self-acting control valve along with an inlet or exhaust valve
Tantalum material can be used. For acetic acid at 185°C, diaphragm pressure gauges are used, those with a tantalum coating.
Thank you all for your suggestions! I have some ideas now; at least I can get this project done!