Method for purifying linuron

Details Method for purifying linuron Method for purifying linuron

1990-03-21

1992-04-07

Brust, Joseph Paul

Organic compounds -- part of the class 532-570 series

Organic compounds

Hydroxamate esters or chalcogen analogues thereof

C07C27532, C07C27316

Patent

active

051030446

ABSTRACT:
In order to remove traces of impurities constituted by tetrachloroazobenzene, tetrachloroazoxybenzene, polychlorinated diphenyl compounds and the like from crude linuron, the crude linuron is subjected to a single purification treatment of dissolution in a hot organic solvent and subsequent crystallization by cooling and recovery of the precipitated linuron. Preferred solvents are aromatic solvents, preferably chlorinated. The treatment enables the impurity content to be reduced to values less than 1 ppm.

REFERENCES:
patent: 4075235 (1978-02-01), Kuhle et al.
Robertson et al., Lab. Practice of Org. Chem., 4th Ed., MacMillan Co., N.Y., 1962, p. 174.

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