Method for producing N-phosphonomethylglycine

Details Method for producing N-phosphonomethylglycine Method for producing N-phosphonomethylglycine

2006-07-04

2006-07-04

Richter, Johann (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus acids or salts thereof

C504S206000

Reexamination Certificate

active

07071354

ABSTRACT:
The present invention relates to a process for the recovery of N-phosphonomethylglycine from an aqueous mixture which contains N-phosphonomethylglycine, ammonium halides, and alkali metal or alkaline earth metal halides and optionally organic impurities in dissolved form, where(a) the pH of the mixture is adjusted to a value in the range from 2 to 8,(b) a separation of the mixture on a selective nanofiltration membrane is performed, a retentate which is richer in N-phosphonomethylglycine and poorer in halides and a permeate which is richer in halides and poorer in N-phosphonomethylglycine being obtained, and(c) the N-phosphonomethylglycine is recovered from the retentate.The process according to the invention makes possible the recovery of the N-phosphonomethylglycine with simultaneous separation of the halide salts.

REFERENCES:
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Jaron et al., Chem Abst. Am.Chem.Soc. vol. 11, No. 4 122, Mar. 1995, Preparation of N-Phosphomethylglycine.

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