Hydrated crystalline form of 2-acrylamido-2-methylpropane sulfonic acid
AssigneeS.P.C.M. SA
InventorsCédrick Favero, Johann Kieffer
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Abstract
The present invention relates to a hydrated crystalline form of 2-acrylamido-2-methylpropane sulfonic acid having a 2-theta powder X-ray diffraction diagram comprising peaks at 10.58°, 11.2°, 12.65°, 13.66°, 16.28°, 18.45°, 20°, 20.4°, 22.5°, 25.5°, 25.88°, 26.47°, 28.52°, 30.28°, 30.8°, 34.09°, 38.19°, 40.69°, 41.82°, 43.74°, 46.04° degrees (+/−0.1°). The present invention also relates to a production method for this form of 2-acrylamido-2-methylpropane sulfonic acid and a preparation method for an aqueous solution A of a salt of this form of 2-acrylamido-2-methylpropane sulfonic acid, and the (co)polymer of this form of -acrylamido-2-methylpropane sulfonic acid.
Claims15
A preparation method of an aqueous solution A of a 2-acrylamido-2-methylpropane sulfonic acid salt, comprising the following steps:
- a) preparing an aqueous solution X of a hydrated crystalline form of 2-acrylamido-2-methylpropane sulfonic acid having a 2-theta powder X-ray diffraction diagram comprising peaks at 10.58°, 11.2°, 12.65°, 13.66°, 16.28°, 18.45°, 20°, 20.4°, 22.5°, 25.5°, 25.88°, 26.47°, 28.52°, 30.28°, 30.8°, 34.09°, 38.19°, 40.69°, 41.82°, 43.74°, and 46.04° degrees, all peak values being +/−0.1,
- b) putting in contact and mixing the aqueous solution X with a compound Y chosen from an alkali or alkaline earth metal hydroxide, an alkali or alkaline earth metal oxide, ammonia, an amine having the following formula NR1R2R3 or an alkali or alkaline earth metal carbonate, wherein R1, R2 and R3 are hydrocarbon groups, thereby forming the solution A comprising the hydrated crystalline form of 2-acrylamido-2-methylpropane sulfonic acid salt.
Dependencies are inferred from the claim text.