Removal and recovery of chloride from phosphonomethyliminodiacetic acid process brine
AssigneeDow AgroSciences LLC
InventorScott G Phillips
Life of this patent
Estimating the term…
Abstract
Chloride is selectively isolated as NaCl from N-phosphonomethyliminodiacetic acid process wastes by evaporative crystallization of the caustic neutralized brine.
Claims7
A process for the removal and recovery of NaCl from a N-phosphonomethyliminodiacetic acid (PMIDA) process waste stream which comprises neutralizing the waste stream with NaOH to a pH of about 7, evaporating off water from the neutralized waste stream at or below atmospheric pressure at a temperature of about 40 to about 130° C. until NaCl precipitates, filtering the precipitate at a temperature of about 35 to about 110° C. to separate the NaCl from the filtrate, and washing the NaCl with brine.
Dependencies are inferred from the claim text.