Preparation of solid ammonium glyphosate using organic...

Details Preparation of solid ammonium glyphosate using organic... Preparation of solid ammonium glyphosate using organic...

2003-09-04

2008-10-14

Richter, Johann (Department: 1616)

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

Organic compounds

Phosphorus acids or salts thereof

C504S206000

Reexamination Certificate

active

07435847

ABSTRACT:
A method of preparing ammonium glyphosate suitable for preparation of water-soluble solid ammonium glyphosate formulation by an extraction with organic solvent in a gas-liquid-solid phase system, which comprises adding glyphosate and water into a reactor with a stirer, introducing ammonia to carry out the reaction, an aqueous solution of ammonium glyphosate is formed after the reaction is completed; adding a water-soluble organic solvent such as methanol and/or ethanol and/or methylal to decrease the solubility of the ammonium glyphosate in the system, thereby crystallizing out ammonium glyphosate; and filtering in suction or further oven-drying to obtain the solid ammonium glyphosate. The organic solvent may be recovered and reused by rectifying or distilling, the remainder residue may be returned to the reaction procedure or used in the preparation of the aqueous formulation of ammonium glyphosate.

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patent: 1340508 (2002-03-01), None
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patent: WO 0108492 (2001-02-01), None

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