| 摘要 |
A process for preparing salts of acrylamido-2-methylpropanesulfonic acid (A) using the steps of:
preparing a solution of a contaminated salt of acrylamido-2-methyl-propanesulfonic acid (A) in an anhydrous organic solvent (L) using at least one basic component (B) selected from the group of alkali metal oxides, alkaline earth metal oxides, alkali metal hydroxides, alkaline earth metal hydroxides and amines of the formula (I)
NRaRbRc (I)where the Ra, Rb and Rc radicals are each independently:hydrogen, C1-C4-alkyl, hydroxy-C1-C4-alkyl or C1-C4-alkoxy,where the molar ratio of compound (A) to the basic component (B) is 1:1 to 1:3,recovering the dissolved salt of compound (A) by crystallization or by precipitation, by altering the temperature and/or the pressure and/or the concentration of the salt in the solution. This leads to salts which are low in by-products and are particularly suitable for polymerization. |
| 主权项 |
1. A process for preparing salts of acrylamido-2-methylpropanesulfonic acid (A) comprising the steps of:
a) preparing a solution of a contaminated salt of acrylamido-2-methylpropanesulfonic acid (A) in an anhydrous organic solvent (L) using at least one basic component (B) selected from the group of alkali metal oxides, alkaline earth metal oxides, alkali metal hydroxides, alkaline earth metal hydroxides and amines of the general formula (I)
NRaRbRc (I) where the Ra, Rb and Re radicals are each independently: hydrogen, C1-C4-alkyl, hydroxy-C1-C4-alkyl or C1-C4-alkoxy, b) optionally partly removing the anhydrous organic solvent (L) at a pressure in the range from 0.001 to 2 bar (abs), c) recovering the dissolved salt of compound (A) by crystallization or by precipitation, by altering the temperature and/or the pressure and/or the concentration of the salt in the solution, d) optionally drying the purified salt of acrylamido-2-methylpropanesulfonic acid (A), wherein the anhydrous organic solvent (L) is selected from the group consisting of methanol, ethanol, propanol, butanol, acetonitrile, acetone, DMF and a mixture of at least two of methanol, ethanol, propanol, butanol, acetonitrile, acetone and DMF. |
