Non-corrosive nitrification inhibitor polar solvent formulation
This invention relates to stable liquid formulations of the nitrification inhibitor nitrapyrin comprising polar solvents that are stabilized with small amounts of compounds which help to reduce the tendency of polar solutions of nitrapyrin to corrode metal surfaces. Many of the formulations disclosed herein exhibit useful physical, chemical, and bioactive properties including reduced levels of corrosion when in contact with ferrous metals.
1. A formulation, comprising:
2-chloro-6-(trichloromethyl)pyridine, wherein the 2-chloro-6-(trichloromethyl)pyridine is present in the formulation in the range of about 200 to about 400 g/L;
at least one polar solvent, selected from the group consisting of: an N,N-dialkyl fatty acid amide, a ketone, a dibasic ester, an organophosphate compound, and an alkoxybenzene compound wherein the polar solvent comprises between about 40 to about 70 weight percent of the formulation;
at least one corrosion inhibitor, selected from the group consisting of: a liquid epoxy resin; 2, 6-dimethylpyridine; epoxidized linseed oil; 2-amino-2-methyl-1-propanol; methyl nicotinate; methyl isonicotinate; and nicotinamide; wherein each said corrosion inhibitor, comprises about 0.5 to about 2.5 weight percent; and
a second solvent selected from the group consisting of: solvent naphtha, aromatic solvents, mineral oils, kerosene, and xylenes, wherein the second solvent comprises about 5.0 to about 20.0 weight percent of the formulation.
2. The formulation according to claim 1 , wherein the ketone is cyclopentanone or cyclohexanone.
3. The formulation according to claim 1 , wherein the dibasic ester comprises:
a diester of formula (IIa):
a diester of formula (IIb):
and
a diester of formula (IIc):
wherein R 1 and R 2 individually comprise a hydrocarbon having from 1 to about 8 carbon atoms.
4. The formulation according to claim 1 , wherein the organophosphate compound is selected from the group including triethyl phosphate, tri(isobutyl)phosphate, tributoxyethyl phosphate and tris(2-ethylhexyl) phosphate.
5. The formulation according to claim 1 , wherein the alkoxybenzene compound is methoxybenzene or ethoxybenzene.