Method of purifying a pesticide

Details Method of purifying a pesticide Method of purifying a pesticide

2007-07-24

2007-07-24

Johnson, Edward M. (Department: 1754)

Chemistry: physical processes

Physical processes

Crystallization

C023S29500G

Reexamination Certificate

active

10397765

ABSTRACT:
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 crystallization inhibiting impurity by an azeotropic method; and d) crystallizing the pesticide. In another embodiment, the present invention includes a method of purifying a pesticide 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 process for the pesticide, methyl N-(2-{[1-(4-chlorophenyl)-1H-pyrazol-3-yl]oxymethyl}phenyl)N-methoxy carbamate.

REFERENCES:
patent: 3956500 (1976-05-01), Durden et al.
patent: 4935527 (1990-06-01), Kitagawa et al.
patent: 5654258 (1997-08-01), Park et al.
patent: 5869517 (1999-02-01), Müller et al.
patent: 6225372 (2001-05-01), Lykke et al.

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