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EC number: 701-247-3
CAS number: -
At 50 °C, the measured vapour pressures of the 5 aromatic sulphonic acids ranged from 4.9 to 14.7 kPa.
Since the measured values has been performed on 65 % solutions at 35 °C, to have a value to be used for the chemical safety assessment, the calculate values with MPBPVP v1.43 (Modified Grain method) have been considered:
The experimental results are:
Benzene sulphonic acid: 16.7 Pa
p-Toluene sulphonic acid: 1.95 Pa
Hydroxybenzene sulphonic acid: 69.8 Pa
Xylene sulphonic acid: 27.9 Pa
Cumene sulphonic acid: 56.1 Pa
The calculated vapour pressures of the 5 aromatic sulphonic acids ranged from 1.95 to 69.8 Pa at 20 °C.
The highest conservative calculated value has been selected as key value for the Chemical Safety Assessment.
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