Method for removal of nitrosoamine impurities from herbicides
AssigneeAgan Chemical Manufacturers Ltd.
InventorsMichael Pikarski, Julian Gabe, Edmund Dykman
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Abstract
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: ##STR1## where X equals chlorine or bromine, R.sup.1 equals lower alkyl, and a equals zero or 1; provided that when a equals 1, then: R equals X.sub.n H.sub.(3-n) C(CH.sub.2).sub.p --, or ##STR2## or R.sup.2 COX, where R.sup.2 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.
Claims12
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:
- ##STR9## where X equals chlorine or bromine,
- R.sup.1 equals lower alkyl, and
- a equals zero or 1;
- provided that when a equals 1, then:
- R equals X.sub.n H.sub.(3-n) C(CH.sub.2).sub.p --, or ##STR10## or R.sup.2 COX, where R.sup.2 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.
A herbicide composition containing material prepared by any of the methods claimed or exemplified in the specification, and adjuvant.
A dinitroaniline herbicide containing less than 0.5 ppm nitrosoamine when prepared by any of the claimed methods or as described in the examples.
Dependencies are inferred from the claim text.