Process for recovering a crystalline product from solution
AssigneeMonsanto Technology LLC
InventorsEric A. Haupfear, Eduardo A. Casanova, Kenneth S. Meyer, Henry H. Chien
Life of this patent
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Abstract
An improved process for recovering a crystalline product (particularly an N-(phosphonomethyl)glycine product) from a solution comprising both a product subject to crystallization and undesired impurities is provided.
Claims30
A process for recovering an N-(phosphonomethyl)glycine product from a slurry comprising precipitated N-(phosphonomethyl)glycine product crystals and a mother liquor, the process comprising:
- dividing the slurry into plural fractions comprising a first slurry fraction and a second slurry fraction;
- separating precipitated N-(phosphonomethyl)glycine product crystals from said first fraction, thereby producing a first wet-cake product;
- and
- separating precipitated N-(phosphonomethyl)glycine product crystals from said second fraction, thereby producing a second wet-cake product, the ratio of solids content of the second wet-cake product to the solids content of the first wet-cake product, as measured by weight percent of solids in said first and second wet-cake products, being at least about 1.1.
A process for recovering an N-(phosphonomethyl) glycine product from a slurry comprising precipitated N-(phosphonomethyl)glycine product crystals and a mother liquor, the process comprising:
- dividing the slurry into plural fractions comprising a first slurry fraction and a second slurry fraction;
- introducing said first slurry fraction into a first liquid/solids separation device;
- separating precipitated N-(phosphonomethyl) glycine product crystals from said first slurry fraction, thereby producing a first wet-cake product;
- introducing said second slurry fraction into a second liquid/solids separation device in parallel with said first liquid/solids separation device;
- and
- separating precipitated N-(phosphonomethyl) glycine product crystals from said second slurry fraction, thereby producing a second wet-cake product, the second wet-cake product having a greater solids content than the first wet-cake product as measured by weight percent of solids in said wet-cake products.
A process for recovering an N-(phosphonomethyl) glycine product from an aqueous oxidation reaction solution comprising an N-(phosphonomethyl)glycine product, the process comprising:
- cooling the aqueous oxidation reaction solution as water is evaporated therefrom under substantially adiabatic conditions to precipitate N-(phosphonomethyl)glycine and produce a slurry comprising precipitated N-(phosphonomethyl) glycine product crystals and a mother liquor;
- dividing the slurry into plural fractions comprising a first slurry fraction and a second slurry fraction;
- separating precipitated N-(phosphonomethyl) glycine product crystals from said first fraction, thereby producing a first wet-cake product;
- and
- separating precipitated N-(phosphonomethyl) glycine product crystals from said second fraction, thereby producing a second wet-cake product, the ratio of solids content of the second wet-cake product to the solids content of the first wet-cake product, as measured by weight percent of solids in said first and second wet-cake products, being at least about 1.1.
Dependencies are inferred from the claim text.