Purification of n-(phosphonomethyl)glycine
AssigneeDow AgroSciences LLC
InventorsJimmy Jui Tai, Herbert Nathan Praay, James William Ringer, Mark Victor Michael Emonds
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Abstract
The present invention is a process for the purification of glyphosate (PMG) comprising: 1) dissolving or suspending a material comprising PMG in water, in the presence of a base, to produce a composition comprising a PMG salt in an aqueous base, 2) contacting the composition with an acid, such that the PMG salt is neutralized, forming a precipitate of PMG, and 3) isolating the precipitate of PMG, with the proviso that the composition of step 1) is not concentrated or filtered using a nanofiltration membrane.
Claims10
A process for the purification of glyphosate (PMG), having glycine, N-methyl-N-(phosphonomethyl)glycine or glyphosine impurities, comprising:
- 1) dissolving or suspending a material comprising PMG, having glycine, N-methyl-N-(phosphonomethyl)glycine or glyphosine impurities, in water, in the presence of a base, to produce a composition comprising a PMG salt in an aqueous base,
- 2) contacting the composition with an acid, such that the PMG salt is neutralized, forming a precipitate of PMG, and
- 3) isolating the precipitate of PMG,
- with the proviso that the composition of step 1) is not concentrated or filtered using a nanofiltration membrane.
Dependencies are inferred from the claim text.