Registration Dossier
Registration Dossier
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EC number: 931-584-3 | CAS number: 66071-92-9
Density
Administrative data
Link to relevant study record(s)
Description of key information
- The mean relative density of Black liquor was determined to be 1.3244.
- The relative density of Black liquor was determined using a pycnometer method.
- Standard deviation: 0.00016, 3 replicates. The measurement temperature was 20.0 °C.
- The tested sample contained 47.3 % water/52.7% dry solids
Key value for chemical safety assessment
- Relative density at 20C:
- 1.324
Additional information
The relative density of Black liquor was determined by using a pycnometer method. The mean relative density of the test substance was determined to be 1.3244.
This result is similar to Branch & Muller-Steinhagen (1991). According to their study the relative density for Black liquor at the 20°C
temperature is 1.309349 (dry substance 52.7%).The density of Kraft Black liquor seems to be changed by the lignin concentration. The higher the lignin concentration the higher are the viscosity and density of KBLs. The pour density of Black liquor (Shen & Rosenholm, no year) varied from 1028.3 to 1026.9 kg/m3 when pulping up to 150 min.
According to Frederick & Adams (1994) density of Black liquor is 1000.4202 kg/m3 at temperature 25oC, when dry solids content is 52.7%. At very low solids contents the density is close to density of water at the same temperature. At higher solids contents, density depends on the organic and inorganic materials which constitute the solids. The inherent density of most organics, including the lignin and carbohydrates in Black liquor, is close to that of water while the density of the inorganic fraction is nearly twice that of water. For this reason the inorganic constituents will have the strongest effect on density of black liquor.
Change in density that occurs in increasing solids concentration from 80-85% solids to 100% solids is small. All of these effects are consistent with the proposition that black liquor in this range is in a highly associated, almost structured, state. In the lower solids concentration range, density at any temperature is a linear function of solids concentration and corresponding state principles can be used to correlate density at other temperatures.
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