METHOD FOR PURIFYING ACRYLAMIDE ALKYL SULFONIC ACID

摘要

A method for purifying acrylamide alkyl sulfonic acid comprises: (1) making a material A evenly mixed and contacted with a solvent C, an amount of the material A exceeding a solubility of the material A in the solvent C under the condition where the material A is located, therefore the material A is not completely dissolved by the solvent C; (2) keeping the material A even mixed and contacted with the solvent C for at least 5 minutes; (3) performing a solid-liquid separation to obtain a solid, namely, a purified product B with impurities reduced. In the purifying method according to the invention, the material does not need to be completely dissolved, therefore less solvent is used, and the steps of dissolving the material by increasing temperature, separating out by decreasing temperature or removing the solvent are eliminated, so cost is reduced, efficiency is improved, and operations are simplified.

主权项

1. A method for purifying acrylamide alkyl sulfonic acid, wherein the method comprises steps of:
(a) making a material A evenly mixed and contacted with a solvent C, the material A comprising at least one acrylamide alkyl sulfonic acid compound represented by the following general formula: in which R1 and R2 are hydrogen and/or an alkyl group containing 1 to 20 carbons, and an amount of the material A exceeds a solubility of the material A in the solvent C under a condition where the material A is located, so that the material A is not completely dissolved by the solvent C; (b) keeping the material A even mixed and contacted with the solvent C for at least 5 minutes; (c) performing a solid-liquid separation to obtain a solid, namely, a purified product B, wherein the product B is the purified material A, wherein the method does not include steps of dissolving the material A by increasing temperature and of re-separating out by decreasing temperature or removing the solvent.