BUCHI Extraction Unit E-816 HE - Manual (Page 41)

6 Operation
41 E-812/816 Hot Extraction Operation Manual, Version B
6 .4 Example of an extraction process
6 .4 .1 Material and equipment
Before starting an extraction process all necessary materials and chemicals must be present:
• Fume hood (only when working with diethyl ether or chloroform)
• Cooling water connection
• Analytical balance (± 0.1 mg; minimal weight 200 g)
• Spatula
• Funnel
• Desiccator
• Solvent
• 2 or 6 beakers
• 2 or 6 glass sample tubes or thimbles
• Waste container for organic solvents
• Depending on the application: Silica sand, celite, glass wool and paper thimbles
NOTE
The holders for the glass sample tubes and the paper thimbles are not microwavable.
6 .4 .2 Preparing an extraction
To prepare the instrument for extraction, proceed as follows:
1. Dry the clean solvent beakers with three boiling stones each in the drying oven for 30 minutes, let
the beakers cool down to ambient temperature in the desiccator and weigh them.
2. Prepare the sample as required in the glass sample tubes with frits or in the paper thimbles, e.g.
hydrolysis and/or drying.
3. Place the prepared glass sample tube or paper thimble with the corresponding holder in the
solvent beaker.
4. Fill the organic solvent directly into the beakers.
5. Place them on the corresponding positions directly on the heating plate.
6. Lower the rack.
7. Activate the occupied positions.
8. Select a previous program or enter a new one.
9. Open the cooling water flow or switch on the connected chiller.
10. Start the extraction process.