Intermediate
Under intermediate or intermediate is understood in the chemistry , the product of a chemical reaction which is not isolated from chemical, technical or economic reasons or in traffic is brought, but further implemented.
- In reaktionsmechanistischer consideration is an intermediate to a molecule in a multistage reaction both as a product of a reaction step, as well as a reactant acts of the following.
- In the chemical industry , intermediate product refers to a product intended for further processing that stands between raw material and end product .
The conceptual boundaries between raw material, intermediate product and end product are often arbitrary and depend on the respective perspective. For example, urea is an end product for a manufacturer who sells this product to a third party. If the third party uses urea to produce melamine , it is a raw material for them. If the urea producer processes the product himself, it is an intermediate product for him.
The EU chemicals regulation REACH differentiates between intermediate products
- non-isolated intermediates
- on-site isolated intermediates and
- transported isolated intermediates
While the non-isolated intermediate products are excluded from the REACH regulation, there is a registration for the isolated intermediate products with lower information requirements, provided that a substance release during manufacture and use can be safely excluded.
Individual evidence
- ^ Albert Gossauer: Structure and reactivity of biomolecules , Verlag Helvetica Chimica Acta, Zurich, 2006, p. 19, ISBN 978-3-906390-29-1 .
- ↑ Otto-Albrecht Neumüller (Ed.): Römpps Chemie-Lexikon. Volume 6: T-Z. 8th revised and expanded edition. Franckh'sche Verlagshandlung, Stuttgart 1988, ISBN 3-440-04516-1 , pp. 4744-4745.
- ↑ Helpdesk reach – clp – biocide: Intermediates , accessed on November 19, 2018