Heidolph LABOROTA 4000 up to 4003 - Manual (Page 138)

Appendix
136 Laborota 4000/4001 efficient, 4010/4011 digital, 4002/4003 control 1.02
11.3 Solvent data
The nomogram shows the relationship between pressure and boiling
temperature of a selection of solvents.
The difference between the temperature of the vapour and the cooling medium
should be 20 K to ensure adequate condensation.
The temperature difference between the heating bath and the vapour should
be at least 20 K to ensure an adequate distillation rate.
As a rule of thumb, doubling the temperature difference will double the
distillation rate.
Fig. 11-1: Nomogram
Conversion Torr to mbar: [mmHg] ≈ 3/4 [mbar]
Solvent data
Solvent Empirical
formula MW
[g/mol] Boil.
[°C]
ΔH
vap
[J/g]
Vacuum for boil.at
40 °C
[mbar] [mm(Hg)]
Acetone C
3
H
6
O 58.08 56.5 550 556 387
Acetonitrile C
2
H
3
N 41.05 81.8 833 230 173
Benzene C
6
H
6
78.11 80.1 549 236 177
n-butanol (butyl alcohol) C
4
H
10
O 74.12 117.5 619 25 19
Tert. butanol (tert. butyl alcohol) C
4
H
10
O 74.12 82.9 588 130 98
2-butanone (methyl ethyl ketone) C
4
H
8
O 72.11 79.6 473 243 182
Chlorobenzene C
6
H
5
CI 112.60 132.2 375 36 27
Cyclohexane C
6
H
12
84.16 80.7 389 235 176
1,2-dichloroethane C
2
H
4
CI
2
98.96 82.4 336 210 158
1,2-dichloroethylene (cis) C
2
H
2
CI
2
96.94 59.0 320 479 134
1,2-dichloroethylene (trans) C
2
H
2
CI
2
96.94 47.8 313 751 563
Dichloromethane (methylene dichloride) CH
2
CI
2
84.93 40.7 373 atm. atm.