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[Nomad_912]

Hello.

I am trying to simulate a mixture of calcium chloride and water in Aspenplus.

 

 I chose the property as ENRTL and selected two components, water and calcium chloride from pure 20 databanks.

 

As I wanted to see how calcium chloride is dissolved in water, I used Elec Wizard.

I got two reactions finally.

 

The first one is : CaCl2 -> Ca(2+) + 2 Cl(-)

the second one is : CaCl2(s) <-> Ca(2+) + 2Cl(-)

(I removed all hydrates with calcium chloride)

 

 

Here are the questions:

1. I understand that second equation is the equilibrium reaction for salt but what I really don't get is the first one. Does the equation means that "solid" calcium chloride completely dissociation in water?

 

2. In my case, every salts(including calcium chloride) starts / exists unsaturated with water. So, is it possible to remove first reaction equation in my case?

 

3. If what I am thinking, is wrong (like stated in question 1 and 2), why does Aspenplus provide two equations like above?

 

 

thanks in advance