6 .11 choosing the heating parameters, 6 .12 solvent addition during extraction – BUCHI Extraction System B-811 LSV User Manual
Page 43
6 Operation
43
B-811 Operation Manual, Version G
6 .11
Choosing the heating parameters
The following heating parameters are recommended:
Heating setting
Heating setting
Solvent
BP / °C
lower
upper
Acetone
56.1
11
3
Ethanol
78.4
16
4
Methanol
64.6
14
4
Xylol
139.5
15
10
Dichloromethane
39.9
9
2
Petroleum ether 40/60
40-60
9
2
n-Hexane
68.8
10
4
Toluene
110.6
13
6
Methylethylketone (MEK) 79.6
11
4
Water
100
20
10
If further heating parameters are required, please refer to the Application Note Nr. 811049 en.
All instrument components in contact with the solvent/sample/analyte are inert. Residual effects
(memory effects) are fully eliminated.
NOTE
The choice of higher heating settings can lead to solvent loss because the cooling capacity is
exceeded. Solvent loss can also be caused by damaged PTFE seals (order number 037388) and
beakers (order number 037276 and 038597). If solvent loss appears the chemical resistance of some
instrument components can be remarkably reduced.
6 .12
Solvent addition during extraction
During the extraction an addition of solvent is possible. The solvent is added
through the condensation tube directly into the sample using a pipette, rinsing
bottles, a dispenser or other solvent delivery devices.
Fig. 6.6: Solvent addition during extraction