Aspen flashing issue
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By searching for information online, I learned that the method for separating sulfur from carbon disulfide is flash evaporation. Sulfur has a melting point of 119°C and a boiling point of 444.6°C℃ ； The melting point of carbon disulfide is -111.9°C, and its boiling point is 46.5°C. However, in simulations using Aspen, the feed at 40°C is already a vapor. Fig (1), Fig (2): Fig (1) and Fig (2) show the flash tank temperatures set at 25°C and 35°C respectively. The sulfur used is S8, Sulfur-8-Atomic. The components of the feed stream are sulfur at 0.0777 and CS2 at 0.9223. I checked in the properties (or rather, I entered the values), and the TB for sulfur is 444.46°C, while the TB for CS2 is 46.25°C. I don’t know why, but I came to ask for advice. Thank you!
It seems that Aspen isn’t very good for solid supports
There is indeed such a claim~ but I think it’s a very basic issue, and powerful companies like Harvard and Aspen surely wouldn’t ignore it~~;P
Solved. There is no Antonine constant for S8 in the database. Simply enter the antoin constant in Properties/methods/parameter/pure components/PLXANT-1.