3 replies to this topic

[ziron]

Hello all,

 

I have a mixture of ammonia + water composition inputed in Hysys and I want to find out know what's the freezing point of this mixture. 

 

How can I find the freezing point in Aspen Hysys ?

 

Tank you.

[IUR]

For Dew point and cricondertherm temperature of the same you may add Envelope utility  on specific stream.

[marchem]

liquid-solid or vapor-solid equilibria requires a specific multiphase capability,

see for example

 

http://www.prode.com/en/multiphase.htm

 

I have calculated freezing points for water + glycols with Prode

but to reduce errors you need to tune the model

for liquid fugacity usually it's a EOS or a model based on liquid activity as NRTL or UNIQUAC

 

as alternative you may consider the tables of values available for many mixtures as water + ammonia

[ziron]

Ok, thank you.