BUCHI Hydrolysis Unit B-411 - Manual (Page 20)

6 Operation
20 B-411/E-416 Operation Manual, Version E
6 .8 Drying the hydrolyzed samples
Before drying the hydrolyzed samples stir the sample layer and the celite layer (without touching the
sand layer) with a spatula to loosen the pulp. Afterwards wipe the spatula with fat free cotton wool or a
tissue and put the tissue into the sample.
Dry the glass sample tubes in a vacuum oven (
≤ 4 h at 100°C/200mbar), in an oven (≤ 8 h at 100°C)
or in a microwave oven. Using a microwave oven makes the drying much faster. However, it is more
awkward due to the fact that the temperature in the sample can easily become too high (> 105 °C) if
an inappropriate heating power has been chosen.
Therefore, we suggest the following:
Step: 18 minutes with an output of 640 W 1.
Step: 10 minutes with an output of 480 W for 4 samples 2.
13 minutes with an output of 480 W for 6 samples
The optimal parameters for the microwave may depend on the model.
The sample is dry when there is no moisture to be seen on the glass wall.
ATTENTION
The plastic holders for the glass sample tubes and paper thimbles for the E-812/E-816 are not
microwavable.
6 .9 Preparing the extraction
Fill the dried, cooled, glass sample tubes with 20 g of quartz sand (grain size 0.3-0.9 mm). They are
now ready for extraction. The glass sample tubes are optimized for use either with the Extraction
System B-811 or with the Extraction Unit E-812/816.
6 .10 Extraction
Buchi offers a wide range of fully automated ex-
traction units. Please consult the corresponding
brochures for detailed information.
Extraction Unit E-812 Soxhlet (2 positions) •
Extraction Unit E-812 Hot Extraction (2 posi- •
tions)
Extraction Unit E-816 Soxhlet (6 positions)
•
Extraction Unit E-816 Hot Extraction (6 posi- •
tions)
Extraction System B-811 Standard (4 posi-
•
tions)
Extraction System B-811 LSV (4 positions)
•
Fig. 6.9: E-816 Hot Extraction