Registration Dossier
Registration Dossier
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EC number: 931-584-3 | CAS number: 66071-92-9
Boiling point
Administrative data
Link to relevant study record(s)
Description of key information
- Black liquor started boiling at 109 °C and boiled over at 120 °C.
- The boiling temperature of Black liquor was determined using the method according to Siwoloboff.
- The atmospheric pressure during the test was 99.0 kPa.
- Due to the colour of the test substance the fused capillary was not observable during the test and therefore no exact boiling temperature of the test substance could be determined.
- The tested sample contained 47.3 % water/52.7% dry solids
Key value for chemical safety assessment
- Boiling point at 101 325 Pa:
- 109 °C
Additional information
The boiling temperature of Black liquor was determined using the method according to Siwoloboff. The atmospheric pressure during the test was 99.0 kPa (calibrated barometer GPB 230, Petrotest, Germany). The black test substance started boiling at 109 °C and boiled over at 120 °C. Due to the colour of the test substance the fused capillary was not observable during the test and therefore no exact boiling temperature of the test substance could be determined.
Additional information:
Studies of boiling point rise in Black liquor has been reported in several reports. According
to Fricke (1993) boiling point rise (BPR) is the difference in boiling temperature between the solution and the pure solvent when measured at the same pressure. There are variations in boiling point elevation from liquor to liquor, even for liquors originating from the same species, at solids concentrations above about 20 -25% solids. However, the general behaviour has been the same for all liquors. BPR increases with solute concentration and can be as high as 25oC for Black liquor leaving the concentrator. The upper limit on the BPR for dry solids content approaching 100% is approximately 55oC. Residual alkali is the major factor in the variability of Black liquor BPR. The key pulp mill variables are chemical charge/unbleached pulp yield ratio, casuricity, sulfate reduction, sulfidity and chloride content. Changing any of these in a way that reduces the dissolved sodium content will decrease the boiling point rise.According to Moosavifar et.al. (2006) the results from boiling point elevation measurements showed that the value of boiling point elevation does not change drastically with removal of lignin. The addition of NaOH to one of the mixtures caused a slight increase in boiling point elevation and a decrease in viscosity of the liquor.
Additional references:
- Fricke, Internal report, Office of industrial technologies, U.S. department of energy, 1993
- Moosavifar & al., Nordic Pulp and Paper Research Journal, Vol. 21, No 2, 2006
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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