Patent ID: 7179936
Filing Date: 2007-02-20
Classification: C07F

Abstract:
1. A process for recovering an N-(phosphonomethyl)glycine product from an aqueous oxidation reaction solution comprising an N-(phosphonomethyl)glycine product, the process comprising: dividing the aqueous reaction solution into plural fractions comprising a primary fraction and a secondary fraction; precipitating N-(phosphonomethyl)glycine product crystals from the primary fraction to produce a primary product slurry comprising precipitated N-(phosphonomethyl)glycine product crystals and a primary mother liquor; dividing said primary product slurry into a first portion and a second portion; separating precipitated N-(phosphonomethyl)glycine product crystals from said first portion of said primary product slurry, thereby producing a first N-(phosphonomethyl)glycine wet-cake product; combining said second portion of said primary product slurry with N-(phosphonomethyl)glycine product contained in said secondary fraction of said aqueous reaction solution; subjecting said secondary fraction of said aqueous reaction solution to an evaporative crystallization operation to precipitate N-(phosphonomethyl)glycine product crystals from said secondary fraction, thereby producing a secondary evaporative product slurry comprising precipitated N-(phosphonomethyl)glycine product crystals and a secondary mother liquor; and separating precipitated N-(phosphonomethyl)glycine product crystals from said secondary evaporative product slurry, thereby producing a second N-(phosphonomethyl)glycine wet-cake product.