Patent ID: 8349140
Filing Date: 2013-01-08
Classification: B01D,G01N,H01P,H05B

Abstract:
1. A device for extracting organic chemical compounds from material in particle form atmospheric samples that uses solvents heated by the application of focalized microwaves in open systems comprising: a magnetron, where the magnetron has a frequency of emission; an electric control circuit of the magnetron; a distillation flask, where the distillation flask comprises a solvent with a sample to be heated; a microwave blocking filter, where the microwave blocking filter enables vapor produced by the ebullition of the solvent with the sample reaching a reflux medium to exit thereby causing the vapor produced by the distillation to condense; and a waveguide, which has in one end the magnetron and the electric control circuit, and in the other end the distillation flask to be heated, the microwave blocking filter and the reflux medium, wherein said microwave blocking filter is placed between said distillation flask and said reflux medium, and comprises a plurality of circular conductor plates, each with a central hole, in such a way that the plates constitute a cylindrical cavity in the microwave blocking filter's center through which the neck of the distillation flask is allowed to pass through, where said plates are disposed in parallel positions and connected in the exterior in short circuit, and where the distillation flask is open in the interior perimeter of the zone of the neck of the distillation flask; where between the open interior perimeter and the closed exterior perimeter in short circuit, there is a distance of a quarter of a wavelength (λ/4) at the frequency of emission of the magnetron, whereby the cylindrical cavities between the conductor plates ending in short circuit in the exterior transform into open circuits for an electromagnetic wave in the interior perimeter, and as a consequence, the electromagnetic wave rapidly attenuates and is blocked before reaching the exterior.