METHOD OF PURIFYING A PESTICIDE

• Main Author: KENNETH EUGENE FERSCH
• Format: Patent
• Language: English; Spanish
• Published: 08.09.2005
• Edition: A
• Subjects: AGRICULTURE; ANIMAL HUSBANDRY; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES, AS HERBICIDES; CHEMISTRY; FISHING; FORESTRY; HETEROCYCLIC COMPOUNDS; HUMAN NECESSITIES; HUNTING; METALLURGY; ORGANIC CHEMISTRY; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS; PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTSTHEREOF; TRAPPING

The present invention describes a method of purifying a pesticide that includes: a) melting a pesticide, wherein the pesticide includes at least one active ingredient and at least one impurity capable of inhibiting crystallization; b) coating the pesticide on a substrate to form a pesticide particle; c) substantially reducing the amount of crys-tallization inhibiting impurity by an azeotropic method; and d) crystallizing the pesticide. In another embodiment, the present invention includes a method of purifying a pesti-cide as described above, such that the pesticide has a melting point of not more than about 90°C. Also included in the invention is the product produced by the above proc-ess for the pesticide, methyl N-(2-{[1-(4-chlorophenyl)-1H-pyrazol-3-yl]oxymethyl} phenyl)N-methoxy carbamate. La presente invencion describe un metodo para purificar un pesticida, que comprende: a) fundir un pesticida, cuyo pesticida comprende por lo menos un ingrediente activo y por lo menos una impureza capaz de inhibir la cristalizacion; b) aplicar el pesticida como recubrimiento sobre un sustrato formando una particula de pesticida; c) reducir substancialmente la cantidad de impurezas inhibidoras de la cristalizacion por medio de un metodo azeotropico; y d) cristalizar el pesticida. En otra modalidad, la presente invencion incluye un metodo para purificar un pesticida tal y como se describe arriba, de tal manera, que el pesticida tenga un punto de fusion de, como maximo, unos 90°C. La invencion comprende, ademas, el producto producido mediante el procedimiento arriba indicado para el pesticida, metil N-(2 -{[1-(4- clorofenil)-1H -pirazol- 3-il] oximetil}fenil)N -metoxi- carbamato.