METHOD FOR PURIFYING SULFONATED AROMATIC MONOMER

摘要

The present invention relates to an improved method for purifying a sulfonated aromatic monomer. The method is an economical method capable of providing a highly pure sulfonated aromatic monomer, in which a salt precipitation step and a recrystallization step are simplified while maintaining the reaction conditions used in a conventional method for synthesizing the sulfonated aromatic monomer, and a purification process is carried out using an easily available and stable chemical substance. The sulfonated aromatic monomer obtained by the purification method will be useful for the preparation of a polymer for a polymer electrolyte membrane and will be advantageous to synthesize polymer with high molecular weight.

主权项

1. A method for purifying a sulfonated aromatic monomer 1 as shown in the following reaction scheme 2, the method comprising the steps of:
allowing an aromatic monomer 3 to react with fuming sulfuric acid 4 to prepare a sulfonated aromatic compound 2; adding a salt to the compound 2 to precipitate a crude compound 1-1; dissolving the crude compound 1-1 in water; neutralizing the aqueous solution containing the crude compound; and concentrating the neutralized aqueous solution and recrystallizing the concentrate from water: