The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 10, 2002
Filed:
Jul. 25, 2000
Richard M. Kramer, Chesterfield, MO (US);
Monsanto Technology LLC, St. Louis, MO (US);
Abstract
A process is provided for preparing ammonium glyphosate powder suitable for downstream processing by extrusion to make a granular formulation comprising ammonium glyphosate and surfactant. The process comprises (a) mixing (i) solid particulate glyphosate acid, (ii) water in an amount of about 0.5 to about 3 parts by weight per part by weight of glyphosate acid, and (iii) a base that supplies ammonium cations, in an amount of about 0.8 to about 1.25 mole equivalents of ammonia per mole of glyphosate acid, to form an aqueous reaction medium; (b) allowing the glyphosate acid to react with the base in the reaction medium to form a reaction product comprising a concentrated aqueous solution of ammonium glyphosate; (c) drying the reaction product, for example with a drum dryer, to recover a particulate solid; and (d) accelerating the particulate solid in a turbulent high-velocity gas stream, for example in a jet mill, to form by particle-particle attrition an ammonium glyphosate powder having a mean particle size of about 5 to about 20 &mgr;m.