Subcritical R134a

isfa_scf · science forum beginner Joined: 18 Apr 2006 Posts: 3

Hi, I am interested in supercritical fluid extraction. And I am still
new on this technology.

Now, I am working on subcritical R134a (1,1,1,2-tetrafluoroethane) as
alternative solvent to CO2 which currently used in many research and
applied in commercialized industrial.

I need some suggestion or opinion or may be ideas about my work. I am
working on extraction of palm oil using subcritical R134a. Do you all
think it is still new work or else? I am still looking the P-T diagram
of R134a and also "reduced pressure-temperature diagram of R134a,
anyone have any idea where can I find these diagram?

Thank you.

onehappymadman@yahoo.com · science forum Guru Wannabe Joined: 07 Oct 2005 Posts: 107

isfa_scf wrote:

protosurge@gmail.com · science forum beginner Joined: 09 Apr 2006 Posts: 4

Look here http://webbook.nist.gov/chemistry/fluid/
You can select R134a as the fluid and generate the required properties.
I don't know if the site will provide a P-T plot but you can do it
manually with the data
that it generates.

Kiran

isfa_scf · science forum beginner Joined: 18 Apr 2006 Posts: 3

Hi.

Actually, I am trying to suggest R134a as alternative to CO2 because
one of the drawback when CO2 is it required extreme high operating
pressure in the region 200-300 bar and sometimes up to 500 bar. This is
one of the factor besides lack of fundamental data (phase equilibrium,
mass transfer etc. )that limits the acceptance of SFE process to be
commercialized in industrial although.

R134a has same benefit as CO2 (non-toxic, non-corrosive, non-reactive,
non-flammable and also non ozone depleting). In fact, R134a is
naturally polar solvent compared to CO2 which is known as non-polar
solvent. So, it is believed that R134a also has a good solvating power
whichis comparable to CO2. That's why I need to find "reduced
pressure-temperature of R134a" in order to compared their properties.

R134a also has lower critical pressure compared to CO2 i.e 40.6 bar, so
lower operating pressure needed to perfom extraction.

Ok, thank you for respond. I am appreciate that Smile

isfa_scf · science forum beginner Joined: 18 Apr 2006 Posts: 3

Ok, thank you very much.

Pranas · science forum beginner Joined: 10 May 2005 Posts: 21

The physical properties of Refrigerant 134a are given in the ASHRE
Fundamentals book.
See for instance the 2001 Edition, Chapter F20. It has a tabulation
and a P H diagram.

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