| 摘要 |
PURPOSE:To obtain the titled compound having high purity and low organic solvent content and to reutilize the solvent, by sulfonating a polystyrene in a halogenated hydrocarbon solvent and separating produced polystyrenesulfonic acid from the reaction mixture using a specific method. CONSTITUTION:A polystyrene having an average molecular weight of 200-50,000 is sulfonated in a halogenated hydrocarbon solvent (preferably methylene dichloride, etc.). The obtained sulfonation reaction product is stirred to disperse the polystyrenesulfonic acid to particles having an average diameter of 5-500mu and the particles are subjected to centrifugal separation under a condition to satisfy 1<=A<=20 and the formula [wherein A is amount (pts.wt.) of the halogenated hydrocarbon per 1pt.wt. of the polystyrene used as the raw material, G is centrifugal force (G) and T is time (min) of centrifugal separation treatment] to obtain the objective compound. The centrifugal separation is preferably centrifugal filtration.
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