Method for removal of nitrosoamine impurities from herbicides

Details Method for removal of nitrosoamine impurities from herbicides Method for removal of nitrosoamine impurities from herbicides

C - Chemistry, Metallurgy

07

C

260/612.3, 260/5

C07C 211/52 (2006.01) C07C 209/84 (2006.01) C07C 311/39 (2006.01)

Patent

CA 1339612

A method for removal of nitrosoamine impurities from herbicides comprising contacting a nitrosoamine containing herbicide homogeneously with 0.001% to 1.0% of a compound having the formula: (see fig.I) where X equals chlorine or bromine, R1 equals lower alkyl, and a equals zero or 1; provided that when a equals 1, then: R equals XnH(3-n) C(CH2)p - , or (see fig.II), or R2COX, where R2 is selected from alkylene, alkenylene, alkynylene groups having 1 to 5 carbon atoms, n equals 1 to 3, and p equals zero, 1 or 2; and provided that when a equals zero, then: R equals aminophenyl, for a sufficient length of time to remove at least a substantial amount of the nitrosoamine.

446476

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