Patent ID: 6586610
Filing Date: 2003-07-01
Classification: C11B

Abstract:
Method for removing coumafos (O,Oâ€²-diethyl-Oâ€³-(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.