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Physical & Chemical properties

Vapour pressure

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Description of key information

- A vapour pressure of 1647 Pa at 20 °C and 2187 Pa at 25 °C was measured for Black liquor by using a static method. 
- The values were calculated from the regression equation based on 20 individual measurements.
- The tested sample contained 47.3 % water/52.7% dry solids

Key value for chemical safety assessment

Vapour pressure:
1 647 Pa
at the temperature of:
20 °C

Additional information

The measured vapour pressure of Black liquor was 1647 Pa at 20 °C and 2187 Pa at 25 °C. These values were calculated from the regression equation based on 20 individual measurements. The test item was an aqueous solution 47.3 % water/52.7% dry solids. Correspondence of the values was very good.

According to Fricke (1993) the vapour pressure for Black liquor 330 mm Hg was measured at temperature 2.8K (35.2% dry solids).

Vapour pressure at various solids concentrations are nearly similar, indicating that the heat of vaporization of water from Black liquor is constant. Even though the data are limited to sub-atmospheric pressure, the data can be extrapolated to 2 -3 atmospheres pressure with reasonable accuracy.