User`s guide

Appendix D-4
Reference Informations Appendix D
Liquid Compressibility Values
Other Data
For other liquids currently used at
ambient temperatures (20-25 °C), the
following data is given. This data is a
result of experiments done using the 305
pump, the figures are not presented as
physical constants of scientific value.
If no data is available in this chapter for
the liquid you use, and if you wish an
accuracy error within the specifications,
you can experimentally determine a
value to reach this goal.
To do so, use a trial-and-error empirical method.
Select the initial value for Liquid Compressibility
according the following guidelines:
- For an organic solvent, take a value given for the
same, or similar, chemical family.
- For a mixture, including salt aqueous solutions,
take the value of the dominant solvent.
Pump your liquid under high pressure to obtain a
significant error, preferably use a gravimetric
method if you know the density of the liquid.
Then, with a few successive approximations, adjust
the Liquid Compressibility value by assuming a
linear relationship between this parameter and the
resulting error.
Liquid Compressibility
(Mbar-1)
Acetonitrile 99
Tetrahydrofuran 93
Water-methanol, 10-90 (v-v) 117
“ 20-80 “ 86
“ 40-60 “ 56
“ 50-60 “ 52
“ 60-40 “ 46
“ 80-20 “ 40