Expansion coefficient of liquid Propane ?

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Discussion Overview

The discussion centers around the expansion coefficient of liquid propane, specifically focusing on its density changes with temperature and pressure. Participants explore theoretical and practical aspects of liquid propane's properties, including calculations and data extraction from reference materials.

Discussion Character

  • Exploratory
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant requests information on the expansion coefficient of liquid propane, indicating difficulty in finding relevant data.
  • Another participant provides density values for propane at various temperatures and pressures, sourced from the CRC handbook.
  • A participant mentions that at 1 atmosphere and temperatures above 0°C, the density figures align with the ideal gas law, suggesting calculations can be made without further lookup.
  • One participant expresses interest in the liquid properties of propane, questioning the assumption of incompressibility and the impact of pressure on density changes.
  • The same participant calculates a coefficient of expansion based on provided figures, indicating a significant reduction in liquid density with temperature change.
  • Another participant notes the limitation of the handbook data, suggesting interpolation for values not directly provided.
  • There is a mention that the temperature and pressure conditions discussed are close to the boiling point of propane.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the assumptions regarding the incompressibility of liquid propane or the significance of pressure changes on density. Multiple viewpoints on the interpretation of the data and its implications remain present.

Contextual Notes

Limitations include the reliance on specific temperature and pressure data points, potential interpolation errors, and the assumption of incompressibility which may not hold under all conditions.

bitman
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Hi

Does anyone have a figure for this.

I've trolled the net for nearly 2 hours now with no success.

Any help or guidance much appreciated.

Bitman
 
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CRC handbook lists the density at various temperatures fordifferent pressures:
At 1 atmosphere (gas)
T (k) density(mol/L)
250 0.050
275 0.045
300 0.041
325 0.037
350 0.035
375 0.032
400 0.030
450 0.027
500 0.024

At 10 atmospheres (liquid)
T (k) density(mol/L)
275 11.962
300 11.102
 
Also note that at 1 atmos and tempertures > 0C that mgb's figures agree with the ideal gas law with at most 2% error. So if you are working in this range then you don't need to look it up, you can calculate it.

PV = NRT

with N and P held constant.

dV/V = dT/T

or dV/dT = V/T
 
Hi

I'm really interested in the liquid properties. I can do the gas stuff (mostly, when I get the sums right :-0 ).

I'm interested in the change of density between 353k (448.9psi) and 293k(124.6 psi).

I thought as it was a liquid it was incompressable thus the pressure didn't matter. If so it should have a fixed coefficient of expansion.

Your figures, mgb_phys, at 10 atm seem to indicate -0.288% per degree C.

So assuming the pressure change is inconsequential I'm looking at a reduction in liquid density of 17.28%.

Thanks for the info and the time.

Please protest if you think these conclusions are incorrect.

Bitman
 
The handbook only gives 1Mpa and 10Mpa - you can interpolate the values you need.
1Mpa
275 = 11.962
300 = 11.102
325 - gas

10Mpa
325 = 10.860
350 = 9.973
375 = 8.905

293K/124.6psi looks very close to boiling point
 

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