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US 6,586,610 B2Granted
Method for removing coumafos from beeswax
AssigneeBayer Aktiengesellschaft
InventorDieter Ulrich
Life of this patent
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Abstract
A method is for removing coumafos (O,O′-diethyl-O″-(3-chloro-4-methyl-7-coumarinyl)thiophosphate) from beeswax by melting the beeswax, adding activated charcoal to the melted beeswax to form a suspension of the activated charcoal in the melted beeswax, and adsorbing coumafos from the melted beeswax onto the activated charcoal, and then pressure filtering.
Claims6
Method for removing coumafos (O,O′-diethyl-O″-(3-chloro-4-methyl-7-coumarinyl)thiophosphate) from beeswax by adsorption onto activated charcoal followed by pressure filtration, which comprises:
- a) melting the beeswax,
- b) adding pulverulent activated charcoal to the melted beeswax in an amount of at least 5 g per litre of melted beeswax,
- c) preparing a homogeneous suspension of the mixture,
- d) maintaining the suspension for a period of time sufficient to adsorb coumafos from the beeswax onto the charcoal,
- e) filtering of the suspension in a pressure filter at a pressure differential across the filter medium of at least 1 bar.
2 more elements
Dependencies are inferred from the claim text.