Glyphosate salt herbicidal composition

A batchwise process for preparing a glyphosate salt solution that comprises potassium and IPA cations in a desired mole ratio of about 50:50 to about 90:10 and has a glyphosate a.e. concentration not less than about 400 g/l, the process comprising a first step of adding glyphosate acid to a glyphosate potassium salt solution having a glyphosate assay of at least about 40% a.e. by weight, to form a slurry;

• and a second step of introducing isopropylamine, in an amount sufficient to neutralize the added glyphosate acid, to the slurry with mixing until all glyphosate is dissolved, to form a mixed glyphosate salt solution comprising potassium and IPA cations in the desired mole ratio.

A continuous process for preparing a finished composition in a form of a glyphosate salt solution that comprises potassium and IPA cations in a desired mole ratio of about 50:50 to about 90:10 and has a glyphosate a.e. concentration not less than about 400 g/l, the process comprising continuously adding glyphosate acid to recycled finished composition with agitation in a first vessel, to form a slurry;

• continuously transferring the slurry to a second vessel;
• continuously adding to the slurry with agitation in the second vessel potassium hydroxide and isopropylamine in the desired mole ratio and in a total amount sufficient to neutralize the glyphosate acid added in the first step, to form the finished composition;
• and continuously dividing the finished composition into a first stream that is recycled to the first vessel and a second stream that is removed as product.