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Title:
METHOD FOR PRODUCING N-PHOSPHONOMETHYLGLYCINE
Document Type and Number:
WIPO Patent Application WO2003000704
Kind Code:
A3
Abstract:
The invention relates to a method for producing N-phosphonomethylglycine from an aqueous mixture containing N-phosphonomethylglycine, ammonium halogenides and alkali halides or earth alkali halides and optionally, organic impurities in a dissolved form. According to the invention, (a) the pH-value of the mixture is regulated to a value of 2 - 8, (b) the mixture is separated by means of a selective nano-filtration membrane, to obtain a retentate rich in N-phosphonomethylglycine and poor in halogenides and a permeate rich in halogenides and poor in N-phosphonomethylglycine and (c) the N-phosphonmethylglycine is prepared from the retentate. The inventive method enables the production of N-phosphonomethylglycine by simultaneously separating the halogenide salts thereof.

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Inventors:
VANDENMERSCH HUGUES (DE)
VOSS HARTWIG (DE)
ORSTEN STEFAN (DE)
WULFF CHRISTIAN (DE)
Application Number:
PCT/EP2002/006903
Publication Date:
May 01, 2003
Filing Date:
June 21, 2002
Export Citation:
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Assignee:
BASF AG (DE)
VANDENMERSCH HUGUES (DE)
VOSS HARTWIG (DE)
ORSTEN STEFAN (DE)
WULFF CHRISTIAN (DE)
International Classes:
C07F9/38; B01D61/02; (IPC1-7): C07F9/38
Domestic Patent References:
WO2001079214A12001-10-25
WO2001047938A12001-07-05
WO1996033005A11996-10-24
Foreign References:
IT1281094B11998-02-11
EP0806428A11997-11-12
DE3025657A11981-04-09
DE2528633A11976-02-05
Other References:
JARON A W ET AL: "Preparation of N-phosphomethylglycine", CHEMICAL ABSTRACTS, AMERICAN CHEMICAL SOCIETY, COLUMBUS, US, vol. 11, no. 122, 13 March 1995 (1995-03-13), XP002015122, ISSN: 0009-2258
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