Reactor for hydrothermal reaction:
Volume = 100 ml
Pmax = 3 MPa
Maximum operating temperature = 200 °C
Solution:
Nitric acid - 15 ml
Sulfuric acid - 5 ml
Distilled water - 100 ml
I am looking for the pressure to be generated inside the reactor (the equation) to know what volume of solution I can introduce at what temperature without generating the allowed pressure limit.
From steam tables, water alone will have a pressure of 1.553 MPa at 200C. According to Aspen Plus simulator, including the acid will decrease the pressure to 1.388 MPa. However, at 200C, the HNO3 will slowly decompose to NO2 and O2 even after the final temperature is reached. The non-condensable gases from HNO3 decomposition will increase the pressure beyond 1.388 MPa. The pressure increase will depend on the amount of vapour space and the extent of HNO3 decomposition.
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