Perforator (chemistry)
In chemistry, the perforator is an extraction device for carrying out a continuous liquid-liquid extraction .
The solvent is continuously evaporated, condensed in a reflux condenser and continuously dripping onto the extraction material (continuous recycling of the solvent), which is dissolved in a liquid that is immiscible with the solvent (second solvent).
A very important application is the determination of formaldehyde in wood-based materials such as chipboard , with toluene and water being used as solvents. The determination of the formaldehyde content of uncoated and unpainted wood-based materials is standardized by DIN EN 120: 1992 (new DIN EN ISO 12460-5: 2016-05). This defines the extraction process and the subsequent determination of the formaldehyde content in the wood samples.
A similar process is extraction with a Soxhlet extractor , which, however, is used in solid-liquid extraction and requires a solvent.
See also
Web links
Individual evidence
- ↑ a b Georg Schwedt; Analytical chemistry: Fundamentals, methods and practice, S88 in the Google book search, ISBN 978-3527312061 .
- ↑ Domenico Scarafilo, Karol Balog, Hazardous substances at the workplace due to formaldehyde in building materials, ISBN 978-3640903511 .