The issue of crystallization heat in the Aspen crystallization model
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The crystal mass model built into Aspen Plus – why is the heat duty simply the enthalpy change resulting from temperature changes? How can the heat of crystallization be taken into account in this model? If we set the temperature of the crystal mass at 10 oC and assume that the temperature of the stream is 20 oC, it’s easy to determine the heat duty required for cooling. But where can we find information on the heat of reaction during crystallization? Thank you. Jianjuntai@gmail.com
The crystallization heat should already be included here; isn’t crystallization heat nothing but the phase transition heat? You can do the calculations by hand to check whether the values obtained from ASPEN’s calculations differ from those you calculate yourself.
Let’s see if this works! An additional heat exchanger is placed in front of the crystallizer to cool the raw material to the desired crystallization temperature of 10°C; in this case, the heat load of the heat exchanger should correspond to the sensible heat, while the heat load of the crystallizer would be the heat required for crystallization.
Heat of crystallization??? As I recall…. it’s in the Help section, but I need to look for it
To calculate the crystallization heat correctly, A+ requires the enthalpy of formation in the solid state and the Gibbs free energy of formation in the solid state; for some substances, these two values may not be available, and they need to be entered manually. The heat load of the crystallizer should consist of two parts: sensible heat + latent heat.
How exactly should the crystallization module be set up? Ask
I have the same problem as the person upstairs. I want to simulate the crystallization of baking soda, but I don’t know where to start. I would appreciate some guidance from those who are more experienced.
Please take a look at this post; I have uploaded a BKP file for your reference: http://bbs.hcbbs.com/viewthread.php?tid=779508